Add keyboard control (WIP, broken)

* square icon
* project icon
* optimize SVG files

.gitea/workflows/sonar.yaml

@@ -0,0 +1,42 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+name: SonarQube Scan
+jobs:
+  sonarqube:
+    name: SonarQube Trigger
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checking out
+        uses: actions/checkout@v4
+        with:
+          # Disabling shallow clone is recommended for improving relevancy of reporting
+          fetch-depth: 0
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: 21
+          distribution: 'temurin'
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+      - name: Cache SonarQube packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.sonar/cache
+          key: ${{ runner.os }}-sonar
+          restore-keys: ${{ runner.os }}-sonar
+      - name: Cache Gradle packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: SonarQube Scan
+        env:
+          SONAR_TOKEN: ${{ secrets.SONARQUBE_TOKEN }}
+          SONAR_HOST_URL: ${{ secrets.SONARQUBE_HOST }}
+        run: ./gradlew sonar

.gitignore

@@ -1,10 +1,11 @@
 *.iml
 .gradle
-**/build/
+build
 xcuserdata
 !src/**/build/
 local.properties
-.idea
+.idea/*
+!.idea/icon.svg
 .DS_Store
 captures
 .externalNativeBuild
@@ -15,3 +16,10 @@ captures
 !*.xcodeproj/project.xcworkspace/
 !*.xcworkspace/contents.xcworkspacedata
 **/xcshareddata/WorkspaceSettings.xcsettings
+.kotlin
+
+# Flatpak Build
+.flatpak-builder
+flatpak/_build
+flatpak/_repo
+flatpak/*.flatpak

.idea/icon.svg

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="48" height="48" version="1.1" viewBox="0 0 48 48" xml:space="preserve" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <filter id="filter31" x="-.03237" y="-.0332" width="1.077" height="1.079" color-interpolation-filters="sRGB">
+            <feFlood flood-color="rgb(0,0,0)" flood-opacity=".498" in="SourceGraphic" result="flood"/>
+            <feGaussianBlur in="SourceGraphic" result="blur" stdDeviation="1.600000"/>
+            <feOffset dx="1.500000" dy="1.500000" in="blur" result="offset"/>
+            <feComposite in="flood" in2="offset" operator="in" result="comp1"/>
+            <feComposite in="SourceGraphic" in2="comp1" result="comp2"/>
+        </filter>
+    </defs>
+    <rect x=".0004669" width="48" height="48" ry="0" fill="#64bb8b" stroke-width=".375"/><g transform="matrix(1.732 0 0 1.732 -4.058 -4.317)"><g transform="matrix(.2167 0 0 .2167 2.134 2.151)" filter="url(#filter31)">
+            <path d="m48.37 30.91s-11.64-10.14-12.76-11.26c-1.13-1.13-3.94-3.19-3.38-4.69s9.971-5.159 16.52-6.57c61.25-13.19 87.04 66.99 69.07 103.2z" fill="#464c4f"/>
+            <path d="m122.8 94.29c-0.5595 4.738-1.756 9.477-3.588 14.22l-60.44-79.85-12.88-19.56c4.272-1.136 8.53-1.823 12.77-2.06l6.657 26.2 8.494-24.95c3.945 0.9298 7.612 2.24 11 3.931l-12.95 27.01 4.08 1.48 17.2-23.38c2.031 1.525 3.874 3.085 5.53 4.68l-17.1 22.64 5.63 4.15 17.61-20.03c2.189 2.771 4.174 5.674 5.953 8.709l-17.15 15.97 3.38 5.56 18.56-12.08c0.8559 1.981 1.623 3.93 2.302 5.847l-18.55 10.95 4.65 5.21 16.18-8.818c0.5694 2.125 1.065 4.261 1.488 6.408l-17.46 8.82 2.96 6.69 15.9-5.81c0.193 2.146 0.3103 4.149 0.352 6.009l-13.65 5.012 3.24 8.09z" fill="#dfdfe0"/>
+            <path d="m56.53 27.11c-9.516 0.6828-16.74 5.918-36.32 31.67 3.278 11.31 6.066 22.03 13.09 31.4 14.76 1.845 25.78-4.514 29.98-7.46-1.57 13.01-3.422 25.25-4.98 38.29-0.3775 3.16 58.74 1 60.58-0.84 4.007-4.007-2.527-67.62-40.1-85.32 0.7087-19.88-8.565-27.38-9.16-27.45-0.0978-0.01053-9.538 2.494-13.09 19.71z" fill="#2f2f2f"/>
+            <g fill="#fff">
+                <path d="m22.53 58.86 10.49-13.09c1.82 2.611-1.21 6.546-7.11 13.86z"/>
+                <path d="m28.47 78.02c16.34-15.16 24.96-8.079 23.51 6.76-2.066 1.049-3.371 1.31-5.45 1.67 1.594-13.42-5.84-12.49-16.75-5.89z"/>
+                <path d="m32.69 85.39c2.974-3.546 7.702-3.297 8.03 1.97-3.067 0.1987-4.479 0.1548-8.68 0z"/>
+                <path d="m29.97 69.81s8.49-10.46 21.02-6.01 7.27 17.55 7.27 17.55l3.43-1.6c3.135-14.52-6.072-15.23-4.5-23.22 0.9881-3.903 1.347-10.12 5.957-11.45 3.973 0.1429 0.08547 6.597 0.7128 12.11 0.9848 8.655 7.527 7.781 3.8 29.32 12.49-6.333 23.42-14.89 33.78-24.22-0.5165-1.271-1.566-2.996-2.49-4.03-19.02 13.86-26.9 18.24-27.36 17.7-0.6832-0.805 7.523-23.24 12.01-34.26-1.74-1.554-2.447-1.879-5.58-3.05-1.498 2.874-3.624 12.45-8.11 11.55-1.88-1.36-1.83-7.65 1.41-11.97 1.73-2.31 3.8-3.05 4.08-9.43 0.4061-9.253-4.874-17.14-5.92-17.08-6.44 4.087-8.193 11.18-9.15 18.21l-2.02 0.75s-0.96 10.46-3.26 12.2-6.05 1.2-6.45-1.78c-0.52-3.91-0.33-7.93-0.33-7.93-3.254 1.182-4.495 3.709-5.2 6.94-0.6171 6.754-10.17 11.48-11.99 22.8z"/>
+                <path d="m89.76 47.43s-5.33 11.83-5.16 12.44 10.23-7.46 10.23-7.46c-3.009-3.735-4.308-4.572-5.07-4.98z"/>
+            </g>
+            <path d="m54.23 53.58c0 2.8-1.08 5.58-4.22 5.3-2.34-0.21-4.27-2.5-4.27-5.3s1.9-5.07 4.25-5.07 4.24 2.27 4.24 5.07z" fill="#0b0b0b"/>
+            <g fill="#fff">
+                <path d="m63.71 101.5-0.84 7.67c28.97-11.09 43.7-32.11 44.98-34-0.5754-2.122-1.508-4.063-2.82-6.13-20.85 22.14-22.95 23.97-41.32 32.46z"/>
+                <path d="m66.88 118.9c4.883-4.883 10.68 3.176 44.13-36.04 0.4748 2.343 1.097 3.836 1.47 5.78-8.404 12.68-15.72 22.85-30.84 30.62-4.826 0.2567-9.638 0.0546-14.76-0.36z"/>
+                <path d="m114.5 99.82c-5.164 9.147-5.757 10.87-11.12 18.16 4.868-0.1117 9.091-0.4384 12.67-0.98 0.343-5.512-0.1736-11.24-1.55-17.18z"/>
+            </g>
+            <path d="m68.64 18.45c-2.435-0.2632-8.507 16.82-1.34 16.82 6.086 0 3.386-16.59 1.34-16.82z" fill="#454c50"/>
+            <path d="m29.88 60c-2.89-2.64-7.41-3.57-9.67-1.22-2.25 2.35-3.57 5.35-5.44 7.32-7.025 6.534-13.12 15.92-8.17 25.53 3 4.97 9.1 8.26 16.61 5.63s10.51-6.48 10.79-9.29c1.036-10.4-6.915-9.81-5.44-13.33 0.75-1.79 6.76-9.66 1.32-14.64z" fill="#464c4f"/>
+            <path d="m11.11 79.71c-0.1 1.56 1.92 1.27 2.63 2.72 0.7 1.45-0.94 4.27 0.89 4.6s4.18-3.28 3.05-6.71c-1.13-3.42-6.43-2.86-6.57-0.61z" fill="#303030"/>
+            <path d="m14.23 97.64s5-2.44 7.25-4.55c2.19-2.06 4.32-4.55 4.83-5.35 0.52-0.8 1.6-2.25 2.53-1.6 0.94 0.66 0.52 1.83-0.09 2.72s-2.16 3.1-4.6 5.35c-2.11 1.95-3.14 2.44-4.69 3.28-1.13 0.61-2.21 0.7-2.21 0.7s-0.88 0.01-1.79-0.14c-0.35-0.05-1.23-0.41-1.23-0.41z" fill="#303030"/>
+        </g></g>
+</svg>

.run/Android.run.xml

@@ -0,0 +1,74 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Android" type="AndroidRunConfigurationType" factoryName="Android App">
+    <module name="YAEP.android" />
+    <option name="ANDROID_RUN_CONFIGURATION_SCHEMA_VERSION" value="1" />
+    <option name="DEPLOY" value="true" />
+    <option name="DEPLOY_APK_FROM_BUNDLE" value="false" />
+    <option name="DEPLOY_AS_INSTANT" value="false" />
+    <option name="ARTIFACT_NAME" value="" />
+    <option name="PM_INSTALL_OPTIONS" value="" />
+    <option name="ALL_USERS" value="false" />
+    <option name="ALWAYS_INSTALL_WITH_PM" value="false" />
+    <option name="ALLOW_ASSUME_VERIFIED" value="false" />
+    <option name="CLEAR_APP_STORAGE" value="false" />
+    <option name="DYNAMIC_FEATURES_DISABLED_LIST" value="" />
+    <option name="ACTIVITY_EXTRA_FLAGS" value="" />
+    <option name="MODE" value="default_activity" />
+    <option name="RESTORE_ENABLED" value="false" />
+    <option name="RESTORE_FILE" value="" />
+    <option name="RESTORE_FRESH_INSTALL_ONLY" value="false" />
+    <option name="CLEAR_LOGCAT" value="false" />
+    <option name="SHOW_LOGCAT_AUTOMATICALLY" value="false" />
+    <option name="TARGET_SELECTION_MODE" value="DEVICE_AND_SNAPSHOT_COMBO_BOX" />
+    <option name="SELECTED_CLOUD_MATRIX_CONFIGURATION_ID" value="-1" />
+    <option name="SELECTED_CLOUD_MATRIX_PROJECT_ID" value="" />
+    <option name="DEBUGGER_TYPE" value="Java" />
+    <Auto>
+      <option name="USE_JAVA_AWARE_DEBUGGER" value="false" />
+      <option name="SHOW_STATIC_VARS" value="true" />
+      <option name="WORKING_DIR" value="" />
+      <option name="TARGET_LOGGING_CHANNELS" value="lldb process:gdb-remote packets" />
+      <option name="SHOW_OPTIMIZED_WARNING" value="true" />
+      <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+      <option name="DEBUG_SANDBOX_SDK" value="false" />
+    </Auto>
+    <Hybrid>
+      <option name="USE_JAVA_AWARE_DEBUGGER" value="false" />
+      <option name="SHOW_STATIC_VARS" value="true" />
+      <option name="WORKING_DIR" value="" />
+      <option name="TARGET_LOGGING_CHANNELS" value="lldb process:gdb-remote packets" />
+      <option name="SHOW_OPTIMIZED_WARNING" value="true" />
+      <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+      <option name="DEBUG_SANDBOX_SDK" value="false" />
+    </Hybrid>
+    <Java>
+      <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+      <option name="DEBUG_SANDBOX_SDK" value="false" />
+    </Java>
+    <Native>
+      <option name="USE_JAVA_AWARE_DEBUGGER" value="false" />
+      <option name="SHOW_STATIC_VARS" value="true" />
+      <option name="WORKING_DIR" value="" />
+      <option name="TARGET_LOGGING_CHANNELS" value="lldb process:gdb-remote packets" />
+      <option name="SHOW_OPTIMIZED_WARNING" value="true" />
+      <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+      <option name="DEBUG_SANDBOX_SDK" value="false" />
+    </Native>
+    <Profilers>
+      <option name="ADVANCED_PROFILING_ENABLED" value="false" />
+      <option name="STARTUP_PROFILING_ENABLED" value="false" />
+      <option name="STARTUP_CPU_PROFILING_ENABLED" value="false" />
+      <option name="STARTUP_CPU_PROFILING_CONFIGURATION_NAME" value="Java/Kotlin Method Sample (legacy)" />
+      <option name="STARTUP_NATIVE_MEMORY_PROFILING_ENABLED" value="false" />
+      <option name="NATIVE_MEMORY_SAMPLE_RATE_BYTES" value="2048" />
+    </Profilers>
+    <option name="DEEP_LINK" value="" />
+    <option name="ACTIVITY" value="" />
+    <option name="ACTIVITY_CLASS" value="" />
+    <option name="SEARCH_ACTIVITY_IN_GLOBAL_SCOPE" value="false" />
+    <option name="SKIP_ACTIVITY_VALIDATION" value="false" />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
+  </configuration>
+</component>

.run/Desktop.run.xml

@@ -0,0 +1,24 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Desktop" type="GradleRunConfiguration" factoryName="Gradle">
+    <ExternalSystemSettings>
+      <option name="executionName" />
+      <option name="externalProjectPath" value="$PROJECT_DIR$/desktop" />
+      <option name="externalSystemIdString" value="GRADLE" />
+      <option name="scriptParameters" value="" />
+      <option name="taskDescriptions">
+        <list />
+      </option>
+      <option name="taskNames">
+        <list>
+          <option value="run" />
+        </list>
+      </option>
+      <option name="vmOptions" />
+    </ExternalSystemSettings>
+    <ExternalSystemDebugServerProcess>true</ExternalSystemDebugServerProcess>
+    <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
+    <DebugAllEnabled>false</DebugAllEnabled>
+    <RunAsTest>false</RunAsTest>
+    <method v="2" />
+  </configuration>
+</component>

.tool-versions

@@ -0,0 +1 @@
+java temurin-21

LICENSE.txt

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
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+
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+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+freedoms that you received.  You must make sure that they, too, receive
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+
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+
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+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
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+
+    d) If the work has interactive user interfaces, each must display
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+used to limit the access or legal rights of the compilation's users
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+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
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+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
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+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
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+
+  All other non-permissive additional terms are considered "further
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+  Additional terms, permissive or non-permissive, may be stated in the
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+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
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+
+  However, if you cease all violation of this License, then your
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+  9. Acceptance Not Required for Having Copies.
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+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
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+available, or (2) arrange to deprive yourself of the benefit of the
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+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+the Program, the only way you could satisfy both those terms and this
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+
+  14. Revised Versions of this License.
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+be similar in spirit to the present version, but may differ in detail to
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+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
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+
+  If the Program specifies that a proxy can decide which future
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
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+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
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+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

android/build.gradle.kts

@@ -0,0 +1,64 @@
+plugins {
+    alias(libs.plugins.kotlin.kover)
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.compose.compiler)
+    alias(libs.plugins.compose)
+    alias(libs.plugins.kotlin.android)
+}
+
+android {
+    namespace = "ch.dissem.yaep"
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
+
+    defaultConfig {
+        applicationId = "ch.dissem.yaep"
+        minSdk = libs.versions.android.minSdk.get().toInt()
+        targetSdk = libs.versions.android.targetSdk.get().toInt()
+        versionCode = libs.versions.app.version.code.get().toInt()
+        versionName = libs.versions.app.version.name.get()
+    }
+
+    dependencies {
+        implementation(compose.components.resources)
+        implementation(compose.runtime)
+//        implementation(compose.foundation)
+        implementation(compose.material3)
+        implementation(compose.ui)
+        implementation(compose.components.resources)
+        implementation(libs.androidx.activity.compose)
+//        implementation(libs.compose.ui.text.googlefonts)
+        implementation(projects.commonUI)
+//        implementation(compose.components.uiToolingPreview)
+        implementation(libs.androidx.tooling.preview)
+
+        testImplementation(libs.kotlin.test)
+        testImplementation(libs.atrium)
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.toVersion(libs.versions.jdk.get())
+        targetCompatibility = JavaVersion.toVersion(libs.versions.jdk.get())
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+        }
+
+        debug {
+            enableAndroidTestCoverage = true
+            enableUnitTestCoverage = true
+        }
+    }
+
+    packaging {
+        resources {
+            merges += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    debugImplementation(libs.androidx.tooling)
+}

android/ic_launcher_monochrome.svg

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generator: Adobe Illustrator 24.1.2, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+
+<svg version="1.1" id="Layer_2" x="0px" y="0px" viewBox="0 0 32 32" xml:space="preserve"
+    sodipodi:docname="ic_launcher_monochrome.svg" inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+    width="32" height="32" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns="http://www.w3.org/2000/svg"><defs
+   id="defs16"><filter
+     style="color-interpolation-filters:sRGB"
+     inkscape:label="Drop Shadow"
+     id="filter31"
+     x="-0.55904404"
+     y="-0.85795969"
+     width="2.3364646"
+     height="3.0510599"><feFlood
+       result="flood"
+       in="SourceGraphic"
+       flood-opacity="0.498039"
+       flood-color="rgb(0,0,0)"
+       id="feFlood30" /><feGaussianBlur
+       result="blur"
+       in="SourceGraphic"
+       stdDeviation="1.600000"
+       id="feGaussianBlur30" /><feOffset
+       result="offset"
+       in="blur"
+       dx="1.500000"
+       dy="1.500000"
+       id="feOffset30" /><feComposite
+       result="comp1"
+       operator="in"
+       in="flood"
+       in2="offset"
+       id="feComposite30" /><feComposite
+       result="comp2"
+       operator="over"
+       in="SourceGraphic"
+       in2="comp1"
+       id="feComposite31" /></filter></defs><sodipodi:namedview
+   id="namedview16"
+   pagecolor="#ffffff"
+   bordercolor="#000000"
+   borderopacity="0.25"
+   inkscape:showpageshadow="2"
+   inkscape:pageopacity="0.0"
+   inkscape:pagecheckerboard="0"
+   inkscape:deskcolor="#d1d1d1"
+   inkscape:zoom="20.237396"
+   inkscape:cx="14.008719"
+   inkscape:cy="17.442956"
+   inkscape:window-width="1854"
+   inkscape:window-height="1011"
+   inkscape:window-x="66"
+   inkscape:window-y="32"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="Layer_2"
+   showgrid="false" />
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<path
+   id="path297"
+   style="opacity:1;fill:#464c4f;fill-opacity:1"
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android/src/main/AndroidManifest.xml

@@ -5,13 +5,13 @@
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
-        android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
+        android:usesCleartextTraffic="false"
         android:theme="@android:style/Theme.Material.Light.NoActionBar">
         <activity
             android:exported="true"
             android:configChanges="orientation|screenSize|screenLayout|keyboardHidden|mnc|colorMode|density|fontScale|fontWeightAdjustment|keyboard|layoutDirection|locale|mcc|navigation|smallestScreenSize|touchscreen|uiMode"
-            android:name=".MainActivity">
+            android:name="ch.dissem.yaep.android.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

android/src/main/kotlin/ch/dissem/yaep/android/MainActivity.kt

@@ -0,0 +1,90 @@
+package ch.dissem.yaep.android
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.CenterAlignedTopAppBar
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.domain.generateGame
+import ch.dissem.yaep.ui.common.App
+import org.jetbrains.compose.resources.painterResource
+import org.jetbrains.compose.resources.stringResource
+import yaep.commonui.generated.resources.action_restart
+import yaep.commonui.generated.resources.app_name
+import yaep.commonui.generated.resources.restart
+import yaep.commonui.generated.resources.Res as CRes
+
+class MainActivity : ComponentActivity() {
+    @OptIn(ExperimentalMaterial3Api::class)
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContent {
+            var game by remember { mutableStateOf(generateGame()) }
+            var resetCluesBeacon by remember { mutableStateOf(Any()) }
+
+            Scaffold(
+                topBar = {
+                    CenterAlignedTopAppBar(
+                        title = {
+                            Text(text = stringResource(CRes.string.app_name))
+                        },
+                        navigationIcon = { },
+                        actions = {
+                            IconButton(
+                                onClick = {
+                                    do {
+                                        // continue
+                                    } while (game.grid.undo())
+                                    resetCluesBeacon = Any()
+                                }
+                            ) {
+                                Icon(
+                                    painter = painterResource(CRes.drawable.action_restart),
+                                    contentDescription = stringResource(CRes.string.restart)
+                                )
+                            }
+                        },
+                    )
+                }
+            ) { insets ->
+                App(
+                    modifier = Modifier.padding(insets),
+                    spacing = 4.dp,
+                    selectDirectly = false,
+                    game = game,
+                    onNewGame = { game = generateGame() },
+                    resetCluesBeacon = resetCluesBeacon
+                )
+            }
+        }
+    }
+}
+
+@Preview
+@Composable
+fun AppAndroidPreview() {
+    var game by remember { mutableStateOf(generateGame()) }
+    var resetCluesBeacon by remember { mutableStateOf(Any()) }
+
+    App(
+        game = game,
+        spacing = 4.dp,
+        selectDirectly = false,
+        onNewGame = { game = generateGame() },
+        resetCluesBeacon = resetCluesBeacon
+    )
+}

android/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,59 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="128"
+    android:viewportHeight="128">
+  <group android:scaleX="0.6072"
+      android:scaleY="0.6072"
+      android:translateX="25.1392"
+      android:translateY="24.419556">
+    <path
+        android:pathData="M48.37,30.91c0,0 -11.64,-10.14 -12.76,-11.26c-1.13,-1.13 -3.94,-3.19 -3.38,-4.69c0.56,-1.5 9.95,-5.26 16.52,-6.57s20.23,-3.38 32.43,2.25s22.01,13.14 30.64,27.03s10.91,33.24 11.45,43.92c0.56,11.23 -3.63,27.24 -3.63,27.24l-1.82,2.79L48.37,30.91z"
+        android:fillColor="#464C4F"/>
+    <path
+        android:pathData="M122.49,94.27c-0.74,8.26 -2.86,14.73 -2.86,14.73l-1.5,3.19L48.67,31.47l10.11,-2.82L45.9,9.09c2.43,-1.02 7.29,-1.97 12.78,-1.97l6.65,26.11l8.55,-25.09c3.7,0.53 9.54,3.27 10.88,4.26L71.88,39.22l4.08,1.48l17.1,-23.3c2.39,1.23 3.98,2.39 5.84,4.5L81.59,44.64l5.63,4.15l17.95,-20.41c2.5,2.36 4.29,4.8 6.16,8.41l-17.7,16.65L97.01,59l19.22,-12.67c1.16,2.32 1.79,3.84 2.22,6.02L99.33,63.71l4.65,5.21l16.61,-9.08c0.81,2.18 1.27,4.01 1.37,6.55l-17.77,8.94l2.96,6.69l15.94,-5.77c0.49,2.39 0.53,3.7 0.21,6.05l-13.55,4.93l3.24,8.09L122.49,94.27z"
+        android:fillColor="#DFDFE0"/>
+    <path
+        android:pathData="M56.53,27.11c0,0 -6.48,0.28 -10.56,3.38S34.01,41.61 30.21,46.11s-10,12.67 -10,12.67l8.02,24.64l5.07,6.76c0,0 9.15,1.27 17.03,-1.27c7.88,-2.53 12.95,-6.19 12.95,-6.19s-1.55,9.85 -2.82,18.44c-1.27,8.59 -2.86,19.01 -2.16,19.85c0.7,0.84 15.67,1.69 30.88,1.27s29,-1.41 29.7,-2.11c0.7,-0.7 2.82,-20.27 -6.76,-45.19S86.38,38.93 84.83,37.95c-1.55,-0.99 -6.05,-3.1 -6.05,-3.1s0.56,-12.11 -2.82,-18.16S71.8,7.64 69.62,7.4c-2.6,-0.28 -7.67,6.26 -9.43,9.01C57.97,19.87 56.53,27.11 56.53,27.11z"
+        android:fillColor="#2F2F2F"/>
+    <path
+        android:pathData="M22.53,58.86l10.49,-13.09c0,0 1.62,2.04 -1.13,6.05c-1.83,2.68 -5.98,7.81 -5.98,7.81L22.53,58.86z"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M28.47,78.02c0,0 10.3,-9.82 16.89,-8.54c8.26,1.6 6.62,15.3 6.62,15.3s-1.36,0.7 -2.63,1.08c-0.89,0.26 -2.82,0.59 -2.82,0.59s0.8,-8.52 -2.67,-10.02c-3.47,-1.5 -7.23,0.19 -10.14,1.88c-2.91,1.69 -3.94,2.25 -3.94,2.25L28.47,78.02z"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M32.69,85.39c0,0 2.25,-2.82 5.07,-2.35c2.82,0.47 2.96,4.32 2.96,4.32s-2.11,0.14 -3.52,0.14s-5.16,-0.14 -5.16,-0.14L32.69,85.39z"
+        android:fillColor="#FFFFFF"/>
+    <path
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+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M89.76,47.43c0,0 -5.33,11.83 -5.16,12.44s10.23,-7.46 10.23,-7.46s-0.97,-1.21 -2.25,-2.63C91.05,48.09 89.76,47.43 89.76,47.43z"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M54.23,53.58c0,2.8 -1.08,5.58 -4.22,5.3c-2.34,-0.21 -4.27,-2.5 -4.27,-5.3c0,-2.8 1.9,-5.07 4.25,-5.07S54.23,50.78 54.23,53.58z"
+        android:fillColor="#0B0B0B"/>
+    <path
+        android:pathData="M63.71,101.51l-0.84,7.67c0,0 11.76,-4.43 19.29,-9.36c7.53,-4.93 19.36,-17.25 21.89,-19.99s3.8,-4.65 3.8,-4.65s-0.46,-1.74 -1.2,-3.24c-0.73,-1.5 -1.62,-2.89 -1.62,-2.89S90.39,84.62 88.35,86.24c-2.04,1.62 -7.81,6.76 -12.18,9.15C71.81,97.78 63.71,101.51 63.71,101.51z"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M66.88,118.9c0.78,-0.78 14.15,-5.84 19.22,-10.35c1.79,-1.59 13.23,-12.32 17.03,-16.61s7.88,-9.08 7.88,-9.08s0.28,1.41 0.77,3.03c0.48,1.57 0.7,2.75 0.7,2.75s-4.79,7.25 -7.32,10.49c-2.53,3.24 -8.52,9.71 -10,11.12c-1.48,1.41 -2.96,3.1 -6.9,5.49c-1.4,0.85 -6.62,3.52 -6.62,3.52s-4.15,0.07 -6.97,0.14C73.42,119.42 66.53,119.25 66.88,118.9z"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M114.46,99.82c0,0 -4.15,8.02 -5.56,10.28c-1.41,2.25 -5.56,7.88 -5.56,7.88s5.7,-0.21 7.67,-0.28s5,-0.35 5,-0.7c0,-0.8 -0.56,-9.08 -0.63,-10.91S115.03,98.77 114.46,99.82z"
+        android:fillColor="#FFFFFF"/>
+    <path
+        android:pathData="M68.64,18.45c-1.48,-0.16 -3.52,4.86 -3.94,7.11c-1.27,6.69 -1.06,9.71 2.6,9.71c4.05,0 3.73,-7.32 3.73,-8.94C71.03,24.72 69.91,18.59 68.64,18.45z"
+        android:fillColor="#454C50"/>
+    <path
+        android:pathData="M29.88,60c-2.89,-2.64 -7.41,-3.57 -9.67,-1.22c-2.25,2.35 -3.57,5.35 -5.44,7.32c-1.88,1.97 -5.82,5.35 -7.98,9.95S3.6,86.66 6.6,91.63s9.1,8.26 16.61,5.63c7.51,-2.63 10.51,-6.48 10.79,-9.29s0,-6.95 -2.91,-9.29c-1.18,-0.95 -3.28,-2.25 -2.53,-4.04S35.32,64.98 29.88,60z"
+        android:fillColor="#464C4F"/>
+    <path
+        android:pathData="M11.11,79.71c-0.1,1.56 1.92,1.27 2.63,2.72c0.7,1.45 -0.94,4.27 0.89,4.6c1.83,0.33 4.18,-3.28 3.05,-6.71C16.55,76.9 11.25,77.46 11.11,79.71z"
+        android:fillColor="#303030"/>
+    <path
+        android:pathData="M14.23,97.64c0,0 5,-2.44 7.25,-4.55c2.19,-2.06 4.32,-4.55 4.83,-5.35c0.52,-0.8 1.6,-2.25 2.53,-1.6c0.94,0.66 0.52,1.83 -0.09,2.72c-0.61,0.89 -2.16,3.1 -4.6,5.35c-2.11,1.95 -3.14,2.44 -4.69,3.28c-1.13,0.61 -2.21,0.7 -2.21,0.7s-0.88,0.01 -1.79,-0.14C15.11,98 14.23,97.64 14.23,97.64z"
+        android:fillColor="#303030"/>
+  </group>
+</vector>

android/src/main/res/drawable/ic_launcher_monochrome.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="32dp"
+    android:height="32dp"
+    android:viewportWidth="32"
+    android:viewportHeight="32">
+  <path
+      android:pathData="M9.1,5.4C8.7,5.7 11.3,7.7 12.4,8.6 10.2,10.3 8.8,11.8 5.3,16.5 -0.3,21.6 6,26.1 9.4,21.7 12.6,22.1 14.9,20.7 15.8,20.1L14.8,28.4c-0.1,0.7 12.7,0.2 13.1,-0.2 0.2,-0.2 0.3,-1.3 0.1,-2.8C30.7,18.3 26.8,5.2 17.3,3.9 14.7,3.5 11.4,4 9.1,5.4ZM15,3.9 L15.4,5.5c-0.3,0.6 -0.7,1.3 -0.9,2.3L12.2,4.3ZM18.2,4.1 L20.5,5 19.1,7.9C18.9,6.3 18.5,5.3 18,4.6ZM17.2,4.7c1.3,1.3 2,4.3 0.4,5.7 -0.7,0.9 -0.7,2.3 -0.3,2.6 1,0.2 1.4,-1.9 1.8,-2.5l1.2,0.7 -2.6,7.4c0,0 1.8,-0.8 5.9,-3.8l0.5,0.9C21.9,17.7 19.5,19.5 16.8,20.9 17.7,15.7 15.6,16.4 16.1,13.4c0.5,-2.9 -1.3,-1.4 -1.5,1 -0.2,1.8 1.7,1.9 1,5L14.8,19.8C16,16.6 12.3,14 9,16.9 9.1,16.5 9.2,16 8.9,15.6 9.4,13.3 11.3,12.3 11.5,10.8c0.2,-0.7 0.4,-1.2 1.1,-1.5 0,1.3 -0.2,2.3 0.8,2.3 1.1,0 1.1,-1.5 1.3,-2.9l0.4,-0.2c0.2,-1.5 0.6,-3.1 2,-3.9zM22.3,6.1 L23.5,7.1 20.8,10.6 19.5,9.9zM17,6.2c-0.5,-0.1 -1.8,3.6 -0.3,3.6 1.3,0 0.7,-3.6 0.3,-3.6zM24.8,8.5 L26,10.4 23.3,12.9 22,11.6zM9.3,12.1c0.4,0.5 -0.2,1.3 -1.3,2.7l-0.7,-0.2zM27.1,12.4 L27.5,13.6 24.8,15.2 24.2,14.2zM21.6,12.4 L22.7,13.5 20.5,15.1zM13,12.7c-0.5,0 -0.9,0.5 -0.9,1.1 0,0.6 0.4,1.1 0.9,1.1 0.7,0.1 0.9,-0.5 0.9,-1.1 0,-0.6 -0.4,-1.1 -0.9,-1.1zM28,15.2 L28.4,16.5 26.1,17.7 25.5,16.5zM24.9,17.1 L25.5,18.4C25.2,18.9 22,23.4 15.8,25.8l0.2,-1.7C19.9,22.3 20.4,21.9 24.9,17.1ZM13.4,20.5 L12.2,20.9C12.5,18.2 11.1,18.2 9,19.4l-0.5,-0.5c2.5,-2.4 5.3,-1.9 4.9,1.6zM28.7,18.6 L28.7,19.9 27.1,20.5 26.7,19.3zM5.4,21c-0.5,0.1 -0.2,-0.7 -0.3,-1 -0.1,-0.3 -0.8,-0.3 -0.5,-0.8 0.2,-0.3 1.1,-0.2 1.3,0.3 0.2,0.5 -0.1,1.4 -0.5,1.5zM26.2,20.1 L26.5,21.4C24.7,24.1 23.1,26.3 19.8,28l-3.2,-0.1c1.1,-1.1 2.3,0.7 9.6,-7.8zM11,21.1l-1.4,0l-0,-0.7c0.9,-0.5 1.2,0.1 1.5,0.7zM28.6,22.4 L28,25 27.6,22.5zM26.9,23.8c0.3,1.3 0.4,2.5 0.3,3.7l-2.7,0.2z"
+      android:fillColor="#464c4f"/>
+</vector>

android/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
+    <background android:drawable="@color/ic_launcher_background"/>
     <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_launcher_monochrome"/>
 </adaptive-icon>

android/src/main/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#64BB8B</color>
+</resources>

android/src/test/kotlin/ch/dissem/yaep/android/DummyTest.kt

@@ -0,0 +1,12 @@
+package ch.dissem.yaep.android
+
+import ch.tutteli.atrium.api.fluent.en_GB.toEqual
+import ch.tutteli.atrium.api.verbs.expect
+import kotlin.test.Test
+
+class DummyTest {
+    @Test
+    fun `ensure some test is run`() {
+        expect(true).toEqual(true)
+    }
+}

build.gradle.kts

@@ -1,8 +1,73 @@
+import com.android.build.gradle.internal.lint.AndroidLintTask
+import com.github.benmanes.gradle.versions.updates.DependencyUpdatesTask
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
+import org.sonarqube.gradle.SonarTask
+
 plugins {
-    // this is necessary to avoid the plugins to be loaded multiple times
-    // in each subproject's classloader
-    alias(libs.plugins.androidApplication) apply false
-    alias(libs.plugins.androidLibrary) apply false
-    alias(libs.plugins.jetbrainsCompose) apply false
-    alias(libs.plugins.kotlinMultiplatform) apply false
+    alias(libs.plugins.versions)
+    alias(libs.plugins.sonarqube)
+    alias(libs.plugins.kotlin.kover)
+    alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.android.library) apply false
+    alias(libs.plugins.compose) apply false
+    alias(libs.plugins.compose.compiler) apply false
+    alias(libs.plugins.kotlin.multiplatform) apply false
+    alias(libs.plugins.kotlin.jvm) apply false
+    alias(libs.plugins.kotlin.android) apply false
+}
+
+sonar {
+    properties {
+        property("sonar.projectKey", "YAEP")
+        property("sonar.projectName", "YAEP")
+
+        property(
+            "sonar.coverage.jacoco.xmlReportPaths",
+            "${layout.buildDirectory.asFile.get()}/reports/kover/report.xml"
+        )
+    }
+}
+
+tasks.withType<SonarTask>().configureEach {
+    dependsOn(
+        subprojects
+            .flatMap { it.tasks.withType<AndroidLintTask>() }
+            .filter { it.variantName != "release" }
+    )
+    dependsOn("koverXmlReport")
+}
+
+tasks.withType<KotlinJvmCompile>().configureEach {
+    compilerOptions {
+        jvmTarget.set(JvmTarget.fromTarget(libs.versions.jdk.get()))
+    }
+}
+
+tasks.withType<DependencyUpdatesTask> {
+    rejectVersionIf {
+        isNonStable(candidate.version) && !isNonStable(currentVersion)
+    }
+}
+
+fun isNonStable(version: String): Boolean {
+    return version.contains("dev", ignoreCase = true)
+            || version.contains("alpha", ignoreCase = true)
+            || version.contains("beta", ignoreCase = true)
+            || version.contains("RC", ignoreCase = true)
+}
+
+subprojects {
+    tasks.withType<Test> {
+        testLogging {
+            events("passed", "skipped", "failed")
+        }
+    }
+}
+
+dependencies {
+    kover(projects.domain)
+    kover(projects.commonUI)
+    kover(projects.desktop)
+    kover(projects.android)
 }

commonUI/build.gradle.kts

@@ -0,0 +1,82 @@
+import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
+import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSetTree
+
+plugins {
+    alias(libs.plugins.kotlin.kover)
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.compose)
+    alias(libs.plugins.compose.compiler)
+}
+
+kotlin {
+    jvmToolchain(libs.versions.jdk.get().toInt())
+
+    jvm()
+    androidTarget {
+        @OptIn(ExperimentalKotlinGradlePluginApi::class)
+        instrumentedTestVariant.sourceSetTree.set(KotlinSourceSetTree.test)
+    }
+
+    sourceSets {
+        commonMain.dependencies {
+            api(projects.domain)
+
+            implementation(compose.components.resources)
+            implementation(compose.runtime)
+            implementation(compose.foundation)
+            implementation(compose.ui)
+            implementation(compose.components.uiToolingPreview)
+
+            implementation(compose.material3)
+
+            implementation(libs.bundles.logging)
+        }
+
+        commonTest.dependencies {
+            implementation(libs.kotlin.test)
+            implementation(libs.atrium)
+
+            @OptIn(org.jetbrains.compose.ExperimentalComposeLibrary::class)
+            implementation(compose.uiTest)
+        }
+
+        jvmTest.dependencies {
+            implementation(compose.desktop.currentOs)
+        }
+    }
+}
+
+android {
+    namespace = "ch.dissem.yaep.common.ui"
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
+
+    dependencies {
+        implementation(libs.androidx.compose.foundation)
+    }
+
+    defaultConfig {
+        minSdk = libs.versions.android.minSdk.get().toInt()
+    }
+
+    buildFeatures {
+        compose = true
+    }
+
+    sourceSets {
+        getByName("test") {
+            resources.srcDirs("src/commonTest/resources")
+        }
+    }
+
+    buildTypes {
+        debug {
+            enableAndroidTestCoverage = true
+            enableUnitTestCoverage = true
+        }
+    }
+}
+
+compose.resources {
+    publicResClass = true
+}

commonUI/src/androidInstrumentedTest/kotlin/ch/dissem/yaep/ui/common/IgnoreAndroidUnitTest.android.kt

@@ -0,0 +1,5 @@
+package ch.dissem.yaep.ui.common
+
+@Suppress("EXPECT_ACTUAL_CLASSIFIERS_ARE_IN_BETA_WARNING")
+@Target(allowedTargets = [AnnotationTarget.CLASS, AnnotationTarget.FUNCTION])
+actual annotation class IgnoreAndroidUnitTest actual constructor()

commonUI/src/androidMain/kotlin/ch/dissem/yaep/ui/common/App.android.kt

@@ -0,0 +1,15 @@
+package ch.dissem.yaep.ui.common
+
+import ch.dissem.yaep.domain.Game
+import io.github.oshai.kotlinlogging.KotlinLogging
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import kotlin.coroutines.CoroutineContext
+
+private val log = KotlinLogging.logger {}
+
+actual fun CoroutineScope.logGame(game: Game, dispatcher: CoroutineContext) {
+    launch(dispatcher) {
+        log.debug { "Game: $game" }
+    }
+}

commonUI/src/androidMain/kotlin/ch/dissem/yaep/ui/common/pointer utils.android.kt

@@ -0,0 +1,17 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.ui.Modifier
+
+@OptIn(ExperimentalFoundationApi::class)
+actual fun Modifier.onPointerAction(
+    primary: () -> Unit,
+    secondary: () -> Unit
+): Modifier {
+    return this
+        .combinedClickable(
+            onClick = primary,
+            onLongClick = secondary
+        )
+}

commonUI/src/androidUnitTest/kotlin/ch/dissem/yaep/ui/common/IgnoreAndroidUnitTest.android.kt

@@ -0,0 +1,4 @@
+package ch.dissem.yaep.ui.common
+
+@Suppress("EXPECT_ACTUAL_CLASSIFIERS_ARE_IN_BETA_WARNING")
+actual typealias IgnoreAndroidUnitTest = org.junit.Ignore

commonUI/src/commonMain/composeResources/drawable/action-restart.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M360,840L303,784L367,720L360,720Q243,720 161.5,638.5Q80,557 80,440Q80,323 161.5,241.5Q243,160 360,160L600,160Q717,160 798.5,241.5Q880,323 880,440Q880,557 798.5,638.5Q717,720 600,720L600,640Q683,640 741.5,581.5Q800,523 800,440Q800,357 741.5,298.5Q683,240 600,240L360,240Q277,240 218.5,298.5Q160,357 160,440Q160,523 218.5,582.5Q277,642 360,648L376,648L304,576L360,520L520,680L360,840Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/lightbulb.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="#fff"
+      android:pathData="M480,880Q447,880 423.5,856.5Q400,833 400,800L560,800Q560,833 536.5,856.5Q513,880 480,880ZM320,760L320,680L640,680L640,760L320,760ZM330,640Q261,599 220.5,530Q180,461 180,380Q180,255 267.5,167.5Q355,80 480,80Q605,80 692.5,167.5Q780,255 780,380Q780,461 739.5,530Q699,599 630,640L330,640ZM354,560L606,560Q651,528 675.5,481Q700,434 700,380Q700,288 636,224Q572,160 480,160Q388,160 324,224Q260,288 260,380Q260,434 284.5,481Q309,528 354,560ZM480,560Q480,560 480,560Q480,560 480,560Q480,560 480,560Q480,560 480,560Q480,560 480,560Q480,560 480,560Q480,560 480,560Q480,560 480,560Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/moon.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="960"
+        android:viewportHeight="960"
+        android:tint="?attr/colorControlNormal">
+    <path
+            android:fillColor="#FFFFFF"
+            android:pathData="M480,840Q330,840 225,735Q120,630 120,480Q120,330 225,225Q330,120 480,120Q494,120 507.5,121Q521,122 534,124Q493,153 468.5,199.5Q444,246 444,300Q444,390 507,453Q570,516 660,516Q715,516 761,491.5Q807,467 836,426Q838,439 839,452.5Q840,466 840,480Q840,630 735,735Q630,840 480,840ZM480,760Q568,760 638,711.5Q708,663 740,585Q720,590 700,593Q680,596 660,596Q537,596 450.5,509.5Q364,423 364,300Q364,280 367,260Q370,240 375,220Q297,252 248.5,322Q200,392 200,480Q200,596 282,678Q364,760 480,760ZM470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Q470,490 470,490Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/neighbour.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="#FFFFFF"
+      android:pathData="M280,680L80,480L280,280L336,336L233,440L727,440L624,336L680,280L880,480L680,680L624,624L727,520L233,520L336,624L280,680Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/order.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="#FFFFFF"
+      android:pathData="M240,560Q207,560 183.5,536.5Q160,513 160,480Q160,447 183.5,423.5Q207,400 240,400Q273,400 296.5,423.5Q320,447 320,480Q320,513 296.5,536.5Q273,560 240,560ZM480,560Q447,560 423.5,536.5Q400,513 400,480Q400,447 423.5,423.5Q447,400 480,400Q513,400 536.5,423.5Q560,447 560,480Q560,513 536.5,536.5Q513,560 480,560ZM720,560Q687,560 663.5,536.5Q640,513 640,480Q640,447 663.5,423.5Q687,400 720,400Q753,400 776.5,423.5Q800,447 800,480Q800,513 776.5,536.5Q753,560 720,560Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/sun.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="960"
+        android:viewportHeight="960"
+        android:tint="?attr/colorControlNormal">
+    <path
+            android:fillColor="#FFFFFF"
+            android:pathData="M480,600Q530,600 565,565Q600,530 600,480Q600,430 565,395Q530,360 480,360Q430,360 395,395Q360,430 360,480Q360,530 395,565Q430,600 480,600ZM480,680Q397,680 338.5,621.5Q280,563 280,480Q280,397 338.5,338.5Q397,280 480,280Q563,280 621.5,338.5Q680,397 680,480Q680,563 621.5,621.5Q563,680 480,680ZM200,520L40,520L40,440L200,440L200,520ZM920,520L760,520L760,440L920,440L920,520ZM440,200L440,40L520,40L520,200L440,200ZM440,920L440,760L520,760L520,920L440,920ZM256,310L155,213L212,154L308,254L256,310ZM748,806L651,705L704,650L805,747L748,806ZM650,256L747,155L806,212L706,308L650,256ZM154,748L255,651L310,704L213,805L154,748ZM480,480Q480,480 480,480Q480,480 480,480Q480,480 480,480Q480,480 480,480Q480,480 480,480Q480,480 480,480Q480,480 480,480Q480,480 480,480Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/window-close.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="960"
+        android:viewportHeight="960"
+        android:tint="?attr/colorControlNormal">
+    <path
+            android:fillColor="#FFFFFF"
+            android:pathData="M256,760L200,704L424,480L200,256L256,200L480,424L704,200L760,256L536,480L760,704L704,760L480,536L256,760Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/window-maximize.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="960"
+        android:viewportHeight="960"
+        android:tint="?attr/colorControlNormal">
+    <path
+            android:fillColor="#FFFFFF"
+            android:pathData="M200,840Q167,840 143.5,816.5Q120,793 120,760L120,200Q120,167 143.5,143.5Q167,120 200,120L760,120Q793,120 816.5,143.5Q840,167 840,200L840,760Q840,793 816.5,816.5Q793,840 760,840L200,840ZM200,760L760,760Q760,760 760,760Q760,760 760,760L760,200Q760,200 760,200Q760,200 760,200L200,200Q200,200 200,200Q200,200 200,200L200,760Q200,760 200,760Q200,760 200,760ZM200,760Q200,760 200,760Q200,760 200,760L200,200Q200,200 200,200Q200,200 200,200L200,200Q200,200 200,200Q200,200 200,200L200,760Q200,760 200,760Q200,760 200,760L200,760Z"/>
+</vector>

commonUI/src/commonMain/composeResources/drawable/window-minimize.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="960"
+        android:viewportHeight="960"
+        android:tint="?attr/colorControlNormal">
+    <path
+            android:fillColor="#FFFFFF"
+            android:pathData="M240,840L240,760L720,760L720,840L240,840Z"/>
+</vector>

commonUI/src/commonMain/composeResources/values-de/strings.xml

@@ -0,0 +1,89 @@
+<resources>
+    <string name="app_name">NERä</string>
+    <string name="app_name_full">Noch so ein Einstein Rätsel</string>
+    <string name="solved_congrats">Gratulation!</string>
+    <string name="solved_time">Du hast das Rätsel in %1$s gelöst</string>
+    <string name="restart">Von Anfang beginnen</string>
+    <string name="use_light_mode">Heller Modus</string>
+    <string name="use_dark_mode">Dunkler Modus</string>
+    <string name="window_minimize">Fenster minimieren</string>
+    <string name="window_maximize">Fenster maximieren</string>
+    <string name="window_close">Fenster schließen</string>
+
+    <!-- Clues -->
+    <string name="clue_next_to">%1$s ist neben %2$s</string>
+    <string name="clue_left_of">%1$s ist links von %2$s</string>
+    <string name="clue_triplet">%2$s ist zwischen den Nachbarn %1$s und %3$s auf beiden Seiten</string>
+    <string name="clue_same_column">%1$s und %2$s sind in der gleichen Spalte</string>
+    <string name="clue_fixed_position">%1$s auf Position %2$i</string>
+
+    <!-- Animals -->
+    <string name="zebra">Zebra</string>
+    <string name="octopus">Oktopus</string>
+    <string name="goat">Ziege</string>
+    <string name="sloth">Faultier</string>
+    <string name="dog">Hund</string>
+    <string name="snail">Schnecke</string>
+    <string name="ant">Ameise</string>
+
+    <!-- Desserts -->
+    <string name="ice_cream">Eis</string>
+    <string name="doughnut">Donut</string>
+    <string name="cookie">Keks</string>
+    <string name="cake">Torte</string>
+    <string name="cupcake">Cupcake</string>
+    <string name="pie">Kuchen</string>
+    <string name="chocolate">Schokolade</string>
+    <string name="lollipop">Lollipop</string>
+    <string name="custard">Vanillepudding</string>
+
+    <!-- Drinks -->
+    <string name="milk">Milch</string>
+    <string name="mate">Mate</string>
+    <string name="water">Wasser</string>
+    <string name="coffee">Kaffee</string>
+    <string name="tea">Tee</string>
+    <string name="bubble_tea">Bubble Tea</string>
+    <string name="beverage">Süssgetränk</string>
+
+    <!-- Fruits -->
+    <string name="banana">Banane</string>
+    <string name="cherries">Kirsche</string>
+    <string name="grapes">Trauben</string>
+    <string name="kiwi">Kiwi</string>
+    <string name="lemon">Zitrone</string>
+    <string name="mango">Mango</string>
+    <string name="pear">Birne</string>
+    <string name="pineapple">Ananas</string>
+    <string name="strawberry">Erdbeere</string>
+    <string name="watermelon">Wassermelone</string>
+
+    <!-- Nationalities -->
+    <string name="canadian">Kanada</string>
+    <string name="japanese">Japan</string>
+    <string name="norwegian">Norwegen</string>
+    <string name="spanish">Spanien</string>
+    <string name="swedish">Schweden</string>
+    <string name="swiss">Schweiz</string>
+    <string name="british">Großbritannien</string>
+    <string name="ukrainian">Ukraine</string>
+
+    <!-- Professions -->
+    <string name="astronaut">Astronauty</string>
+    <string name="health_worker">Pflegy</string>
+    <string name="farmer">Bauy</string>
+    <string name="rock_star">Rock Star</string>
+    <string name="scientist">Wissenschaftly</string>
+    <string name="software_dev">Softwareentwickly</string>
+    <string name="firefighter">Feuerwehrperson</string>
+    <string name="teacher">Lehry</string>
+
+    <!-- Transportation -->
+    <string name="bicycle">Fahrrad</string>
+    <string name="motor_scooter">Roller</string>
+    <string name="skateboard">Rollbrett</string>
+    <string name="taxi">Taxi</string>
+    <string name="locomotive">Lok</string>
+    <string name="tram_car">Tram</string>
+    <string name="bus">Bus</string>
+</resources>

commonUI/src/commonMain/composeResources/values/strings.xml

@@ -0,0 +1,89 @@
+<resources>
+    <string name="app_name">YAEP</string>
+    <string name="app_name_full">Yet Another Einstein Puzzle</string>
+    <string name="solved_congrats">Congratulations!</string>
+    <string name="solved_time">You solved the puzzle in %1$s</string>
+    <string name="restart">Restart</string>
+    <string name="use_light_mode">Use light mode</string>
+    <string name="use_dark_mode">Use dark mode</string>
+    <string name="window_minimize">Minimize window</string>
+    <string name="window_maximize">Maximize window</string>
+    <string name="window_close">Close window</string>
+
+    <!-- Clues -->
+    <string name="clue_next_to">%1$s is next to %2$s</string>
+    <string name="clue_left_of">%1$s is left of %2$s</string>
+    <string name="clue_triplet">%2$s is between the neighbours %1$s and %3$s to both sides</string>
+    <string name="clue_same_column">%1$s and %2$s are in the same column</string>
+    <string name="clue_fixed_position">%1$s at position %2$i</string>
+
+    <!-- Animals -->
+    <string name="zebra">Zebra</string>
+    <string name="octopus">Octopus</string>
+    <string name="goat">Goat</string>
+    <string name="sloth">Sloth</string>
+    <string name="dog">Dog</string>
+    <string name="snail">Snail</string>
+    <string name="ant">Ant</string>
+
+    <!-- Desserts -->
+    <string name="ice_cream">Ice Cream</string>
+    <string name="doughnut">Doughnut</string>
+    <string name="cookie">Cookie</string>
+    <string name="cake">Cake</string>
+    <string name="cupcake">Cupcake</string>
+    <string name="pie">Pie</string>
+    <string name="chocolate">Chocolate</string>
+    <string name="lollipop">Lollipop</string>
+    <string name="custard">Custard</string>
+
+    <!-- Drinks -->
+    <string name="milk">Milk</string>
+    <string name="mate">Mate</string>
+    <string name="water">Water</string>
+    <string name="coffee">Coffee</string>
+    <string name="tea">Tea</string>
+    <string name="bubble_tea">Bubble Tea</string>
+    <string name="beverage">Beverage</string>
+
+    <!-- Fruits -->
+    <string name="banana">Banana</string>
+    <string name="cherries">Cherries</string>
+    <string name="grapes">Grapes</string>
+    <string name="kiwi">Kiwi</string>
+    <string name="lemon">Lemon</string>
+    <string name="mango">Mango</string>
+    <string name="pear">Pear</string>
+    <string name="pineapple">Pineapple</string>
+    <string name="strawberry">Strawberry</string>
+    <string name="watermelon">Watermelon</string>
+
+    <!-- Nationalities -->
+    <string name="canadian">Canadian</string>
+    <string name="japanese">Japanese</string>
+    <string name="norwegian">Norwegian</string>
+    <string name="spanish">Spaniard</string>
+    <string name="swedish">Swede</string>
+    <string name="swiss">Swiss</string>
+    <string name="british">British</string>
+    <string name="ukrainian">Ukrainian</string>
+
+    <!-- Professions -->
+    <string name="astronaut">Astronaut</string>
+    <string name="health_worker">Health Worker</string>
+    <string name="farmer">Farmer</string>
+    <string name="rock_star">Rock Star</string>
+    <string name="scientist">Scientist</string>
+    <string name="software_dev">Software Developer</string>
+    <string name="firefighter">Firefighter</string>
+    <string name="teacher">Teacher</string>
+
+    <!-- Transportation -->
+    <string name="bicycle">Bicycle</string>
+    <string name="motor_scooter">Motor Scooter</string>
+    <string name="skateboard">Skateboard</string>
+    <string name="taxi">Taxi</string>
+    <string name="locomotive">Locomotive</string>
+    <string name="tram_car">Tram Car</string>
+    <string name="bus">Bus</string>
+</resources>

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/App.kt

@@ -0,0 +1,114 @@
+package ch.dissem.yaep.ui.common
+
+import SelectionManager
+import androidx.compose.foundation.layout.Box
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.TextUnit
+import androidx.compose.ui.unit.TextUnitType
+import ch.dissem.yaep.domain.Game
+import focus
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlin.coroutines.CoroutineContext
+import kotlin.time.ExperimentalTime
+
+@Composable
+@OptIn(ExperimentalTime::class)
+fun App(
+    modifier: Modifier = Modifier,
+    selectionManager: SelectionManager,
+    selectDirectly: Boolean,
+    spacing: Dp,
+    game: Game,
+    onNewGame: () -> Unit,
+    resetCluesBeacon: Any = Any()
+) {
+    val horizontalClues =
+        remember(game, resetCluesBeacon) { game.horizontalClues.map { DisplayClue(it) } }
+    val verticalClues =
+        remember(game, resetCluesBeacon) { game.verticalClues.map { DisplayClue(it) } }
+    val timer = remember(game) { GameTimer() }
+    val time by timer.elapsedTime.collectAsState("00:00")
+    var isSolved by remember(game) { mutableStateOf(false) }
+    LaunchedEffect(game) {
+        logGame(game)
+
+        game.onStart {
+            timer.start()
+        }
+
+        game.onSolved {
+            timer.stop()
+            isSolved = true
+        }
+    }
+
+    Box(modifier = modifier) {
+        AdaptiveGameLayout(
+            modifier = Modifier.blurOnFinished(isSolved),
+            grid = {
+                val focusable = remember { selectionManager.add() }
+                PuzzleGrid(
+                    modifier = Modifier
+                        .focus(focusable),
+                    selectDirectly = selectDirectly,
+                    selectionManager = selectionManager,
+                    grid = game.grid,
+                    spacing = spacing,
+                    onUpdate = {
+                        horizontalClues.forEach { it.update(game.grid) }
+                        verticalClues.forEach { it.update(game.grid) }
+                    }
+                )
+            },
+            horizontalClues = {
+                val focusable = remember { selectionManager.add() }
+                for (clue in horizontalClues) {
+                    HorizontalClue(
+                        modifier = Modifier
+                            .focus(focusable)
+                            .forClue(clue, spacing),
+                        spacing = spacing,
+                        clue = clue.clue,
+                        isClueViolated = clue.isViolated
+                    )
+                }
+            },
+            verticalClues = {
+                val focusable = remember { selectionManager.add() }
+                for (clue in verticalClues) {
+                    VerticalClue(
+                        modifier = Modifier
+                            .focus(focusable)
+                            .forClue(clue, spacing),
+                        spacing = spacing,
+                        clue = clue.clue,
+                        isClueViolated = clue.isViolated
+                    )
+                }
+            },
+            time = {
+                Text(
+                    time,
+                    fontSize = TextUnit(4f, TextUnitType.Companion.Em),
+                    textAlign = TextAlign.End
+                )
+            },
+            spacing = spacing
+        )
+        EndOfGame(isSolved = isSolved, time = time, onRestart = onNewGame)
+    }
+}
+
+expect fun CoroutineScope.logGame(game: Game, dispatcher: CoroutineContext = Dispatchers.IO)

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/GameTimer.kt

@@ -0,0 +1,57 @@
+package ch.dissem.yaep.ui.common
+
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.map
+
+class GameTimer {
+
+    private var startTime: Long = 0L
+    private var stopTime: Long = 0L
+
+    val isRunning: Boolean
+        get() = startTime != 0L && stopTime == 0L
+
+    val elapsedSeconds: Flow<Long> = flow {
+        emit(0L)
+        while (startTime == 0L) {
+            delay(100)
+        }
+        var previousSeconds = 0L
+        while (stopTime == 0L) {
+            val elapsedSeconds = System.currentTimeMillis() / 1000 - startTime
+            if (elapsedSeconds != previousSeconds) {
+                emit(elapsedSeconds)
+            }
+            delay(100)
+            previousSeconds = elapsedSeconds
+        }
+        emit(stopTime - startTime)
+    }
+
+    val elapsedTime: Flow<String> = elapsedSeconds.map { seconds ->
+        val minutes = seconds / 60
+        val hours = minutes / 60
+        val remainingMinutes = minutes % 60
+        val remainingSeconds = seconds % 60
+        if (hours == 0L) {
+            "%02d:%02d".format(minutes, remainingSeconds)
+        } else {
+            "%02d:%02d:%02d".format(hours, remainingMinutes, remainingSeconds)
+        }
+    }
+
+    fun start() {
+        if (startTime == 0L) {
+            startTime = System.currentTimeMillis() / 1000
+        }
+    }
+
+    fun stop() {
+        if (isRunning) {
+            stopTime = System.currentTimeMillis() / 1000
+        }
+    }
+
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/adaptive game layout.kt

@@ -0,0 +1,338 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.Layout
+import androidx.compose.ui.layout.Measurable
+import androidx.compose.ui.layout.Placeable
+import androidx.compose.ui.unit.Constraints
+import androidx.compose.ui.unit.Constraints.Companion.fixed
+import androidx.compose.ui.unit.Constraints.Companion.fixedWidth
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.ui.common.AspectRatio.LANDSCAPE
+import ch.dissem.yaep.ui.common.AspectRatio.PORTRAIT
+import ch.dissem.yaep.ui.common.AspectRatio.SQUARISH
+import kotlin.math.max
+import kotlin.math.min
+
+
+private enum class AspectRatio {
+    PORTRAIT, LANDSCAPE, SQUARISH;
+
+    companion object {
+        private const val ASPECT_RATIO_LANDSCAPE = 1.4f
+        private const val ASPECT_RATIO_PORTRAIT = 1 / ASPECT_RATIO_LANDSCAPE
+
+        fun from(constraints: Constraints): AspectRatio {
+            val ratio = constraints.maxWidth.toFloat() / constraints.maxHeight.toFloat()
+            return when {
+                ratio < ASPECT_RATIO_PORTRAIT -> PORTRAIT
+                ratio > ASPECT_RATIO_LANDSCAPE -> LANDSCAPE
+                else -> SQUARISH
+            }
+        }
+    }
+}
+
+@Composable
+fun AdaptiveGameLayout(
+    modifier: Modifier = Modifier,
+    grid: @Composable () -> Unit,
+    horizontalClues: @Composable () -> Unit,
+    verticalClues: @Composable () -> Unit,
+    time: @Composable () -> Unit,
+    divider: @Composable () -> Unit = { HorizontalDivider() },
+    spacing: Dp = 8.dp
+) {
+    Layout(
+        contents = listOf(grid, horizontalClues, verticalClues, time, divider, divider),
+        modifier = modifier
+    ) { measurables, constraints ->
+        layout(width = constraints.maxWidth, height = constraints.maxHeight) {
+            val aspectRatio = AspectRatio.from(constraints)
+
+            val gridMeasurable = measurables[0][0]
+            val horizontalCluesMeasurables = measurables[1]
+            val verticalCluesMeasurables = measurables[2]
+            val timeMeasurable = measurables[3][0]
+            val dividerMeasurable = measurables[4][0]
+
+            val spacingPx = spacing.roundToPx()
+
+            when (aspectRatio) {
+                PORTRAIT -> {
+                    val divider2Measurable = measurables[5][0]
+                    portrait(
+                        constraints,
+                        spacingPx,
+                        gridMeasurable,
+                        horizontalCluesMeasurables,
+                        verticalCluesMeasurables,
+                        timeMeasurable,
+                        dividerMeasurable,
+                        divider2Measurable
+                    )
+                }
+
+                SQUARISH -> {
+                    squarish(
+                        constraints,
+                        spacingPx,
+                        gridMeasurable,
+                        horizontalCluesMeasurables,
+                        verticalCluesMeasurables,
+                        timeMeasurable
+                    )
+                }
+
+                LANDSCAPE -> {
+                    landscape(
+                        constraints,
+                        spacingPx,
+                        gridMeasurable,
+                        horizontalCluesMeasurables,
+                        verticalCluesMeasurables,
+                        timeMeasurable,
+                        dividerMeasurable
+                    )
+                }
+            }
+        }
+    }
+}
+
+private fun Placeable.PlacementScope.portrait(
+    constraints: Constraints,
+    spacingPx: Int,
+    gridMeasurable: Measurable,
+    horizontalCluesMeasurables: List<Measurable>,
+    verticalCluesMeasurables: List<Measurable>,
+    timeMeasurable: Measurable,
+    divider1Measurable: Measurable,
+    divider2Measurable: Measurable
+) {
+    val gridSize = constraints.maxWidth
+    val gridItemSize = (gridSize - 12 * spacingPx) / 18
+
+    val gridConstraints = fixed(gridSize, gridSize)
+    val horizontalCluesConstraints = fixed(
+        width = 3 * gridItemSize + 2 * spacingPx,
+        height = gridItemSize + 2 * spacingPx
+    )
+    val verticalCluesConstraints = fixed(
+        width = gridItemSize + 2 * spacingPx,
+        height = 3 * gridItemSize + 2 * spacingPx
+    )
+    val timeConstraints = Constraints()
+    val dividerConstraints = fixedWidth(gridSize)
+
+    val gridPlaceable = gridMeasurable.measure(gridConstraints)
+    val horizontalCluesPlaceables = horizontalCluesMeasurables.map {
+        it.measure(horizontalCluesConstraints)
+    }
+    val verticalCluesPlaceables = verticalCluesMeasurables.map {
+        it.measure(verticalCluesConstraints)
+    }
+    val timePlaceable = timeMeasurable.measure(timeConstraints)
+    val divider1Placeable = divider1Measurable.measure(dividerConstraints)
+    val divider2Placeable = divider2Measurable.measure(dividerConstraints)
+
+    // Position the grid
+    gridPlaceable.place(0, 0)
+
+    divider1Placeable.place(0, gridSize + spacingPx)
+
+    // Position the horizontal clues
+    var offsetY = placeClues(
+        placeables = horizontalCluesPlaceables,
+        offsetX = 0,
+        offsetY = gridSize + 2 * spacingPx,
+        maxWidth = gridSize
+    )
+
+    // Add divider in between
+    divider2Placeable.place(0, offsetY + spacingPx)
+
+    // Position the vertical clues
+    offsetY = placeClues(
+        placeables = verticalCluesPlaceables,
+        offsetX = 0,
+        offsetY = offsetY + spacingPx + divider2Placeable.height,
+        maxWidth = gridSize
+    )
+
+    // Position the time
+    val remainingSpace = constraints.maxHeight - offsetY
+    if (remainingSpace < timePlaceable.height) {
+        val scale = remainingSpace.toFloat() / timePlaceable.height.toFloat()
+        if (scale > 0.1f) {
+            timePlaceable.placeWithLayer(
+                x = constraints.maxWidth - timePlaceable.width - spacingPx,
+                y = constraints.maxHeight - timePlaceable.height
+            ) {
+                scaleX = scale
+                scaleY = scale
+                translationX = (timePlaceable.width * (1 - scale)) / 2f
+                translationY = (timePlaceable.height * (1 - scale)) / 2f
+            }
+        }
+    } else {
+        timePlaceable.place(
+            x = constraints.maxWidth - timePlaceable.width - spacingPx,
+            y = constraints.maxHeight - timePlaceable.height
+        )
+    }
+}
+
+private fun Placeable.PlacementScope.squarish(
+    constraints: Constraints,
+    spacingPx: Int,
+    gridMeasurable: Measurable,
+    horizontalCluesMeasurables: List<Measurable>,
+    verticalCluesMeasurables: List<Measurable>,
+    timeMeasurable: Measurable
+) {
+    val gridSize = (7 * min(constraints.maxWidth, constraints.maxHeight)) / 10
+    val gridItemSize = (gridSize - 12 * spacingPx) / 18
+    val rightBarWidth = constraints.maxWidth - gridSize - spacingPx
+
+    val gridConstraints = fixed(gridSize, gridSize)
+    val horizontalCluesConstraints = fixed(
+        width = 3 * gridItemSize + 2 * spacingPx,
+        height = gridItemSize + 2 * spacingPx
+    )
+    val verticalCluesConstraints = fixed(
+        width = gridItemSize + 2 * spacingPx,
+        height = 3 * gridItemSize + 2 * spacingPx
+    )
+    val timeConstraints = Constraints()
+
+    val gridPlaceable = gridMeasurable.measure(gridConstraints)
+    val horizontalCluesPlaceables = horizontalCluesMeasurables.map {
+        it.measure(horizontalCluesConstraints)
+    }
+    val verticalCluesPlaceables = verticalCluesMeasurables.map {
+        it.measure(verticalCluesConstraints)
+    }
+    val timePlaceable = timeMeasurable.measure(timeConstraints)
+
+    // Position the grid
+    gridPlaceable.place(0, 0)
+
+    // Position the horizontal clues
+    placeClues(
+        placeables = horizontalCluesPlaceables,
+        offsetX = gridSize + 2 * spacingPx,
+        offsetY = 0,
+        maxWidth = rightBarWidth
+    )
+
+    // Position the vertical clues
+    placeClues(
+        placeables = verticalCluesPlaceables,
+        offsetX = 0,
+        offsetY = gridSize + 2 * spacingPx,
+        maxWidth = gridSize
+    )
+
+    // Position the time
+    timePlaceable.place(
+        x = constraints.maxWidth - timePlaceable.width - spacingPx,
+        y = constraints.maxHeight - timePlaceable.height
+    )
+}
+
+private fun Placeable.PlacementScope.landscape(
+    constraints: Constraints,
+    spacingPx: Int,
+    gridMeasurable: Measurable,
+    horizontalCluesMeasurables: List<Measurable>,
+    verticalCluesMeasurables: List<Measurable>,
+    timeMeasurable: Measurable,
+    dividerMeasurable: Measurable
+) {
+    val gridSize = constraints.maxHeight
+    val gridItemSize = (gridSize - 12 * spacingPx) / 18
+    val rightBarWidth = constraints.maxWidth - gridSize - 2 * spacingPx
+
+    val gridConstraints = fixed(gridSize, gridSize)
+    val baseSpace = gridSize - 2 * spacingPx
+    val horizontalCluesConstraints = fixed(
+        width = 3 * gridItemSize + 2 * spacingPx,
+        height = gridItemSize + 2 * spacingPx
+    )
+    val verticalCluesConstraints = fixed(
+        width = gridItemSize + 2 * spacingPx,
+        height = 3 * gridItemSize + 2 * spacingPx
+    )
+    val timeConstraints = Constraints.fixedHeight(baseSpace / 10)
+    val dividerConstraints = fixedWidth(rightBarWidth - 2 * spacingPx)
+
+    val gridPlaceable = gridMeasurable.measure(gridConstraints)
+    val horizontalCluesPlaceables = horizontalCluesMeasurables.map {
+        it.measure(horizontalCluesConstraints)
+    }
+    val verticalCluesPlaceables = verticalCluesMeasurables.map {
+        it.measure(verticalCluesConstraints)
+    }
+    val timePlaceable = timeMeasurable.measure(timeConstraints)
+    val dividerPlaceable = dividerMeasurable.measure(dividerConstraints)
+
+    // Position the grid
+    gridPlaceable.place(0, 0)
+
+    // Position the horizontal clues
+    val offsetY = placeClues(
+        placeables = horizontalCluesPlaceables,
+        offsetX = gridSize + 2 * spacingPx,
+        offsetY = 0,
+        maxWidth = rightBarWidth
+    )
+
+    // Add divider in between
+    dividerPlaceable.place(gridSize + 3 * spacingPx, offsetY + spacingPx)
+
+    // Position the vertical clues
+    placeClues(
+        placeables = verticalCluesPlaceables,
+        offsetX = gridSize + 2 * spacingPx,
+        offsetY = offsetY + spacingPx + dividerPlaceable.height,
+        maxWidth = rightBarWidth
+    )
+
+    // Position the time
+    timePlaceable.place(
+        x = constraints.maxWidth - timePlaceable.width - spacingPx,
+        y = constraints.maxHeight - timePlaceable.height
+    )
+}
+
+private fun Placeable.PlacementScope.placeClues(
+    placeables: List<Placeable>,
+    offsetX: Int,
+    offsetY: Int,
+    maxWidth: Int
+): Int {
+    if (placeables.isEmpty()) return offsetY
+
+    val itemWidth = placeables.first().width
+    val itemHeight = placeables.first().height
+    val columns = max(1, maxWidth / itemWidth)
+    val spacing = if (columns == 1) 0 else (maxWidth - columns * itemWidth) / (columns - 1)
+    var currentX = offsetX
+    var currentY = offsetY
+    var i = 0
+    for (placeable in placeables) {
+        placeable.place(currentX, currentY)
+        currentX += itemWidth + spacing
+        i++
+        if (i % columns == 0 && i < placeables.size) {
+            currentX = offsetX
+            currentY += itemHeight
+        }
+    }
+    return currentY + itemHeight
+}
+

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/clues.kt

@@ -0,0 +1,144 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedCard
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.domain.Clue
+import ch.dissem.yaep.domain.Grid
+import ch.dissem.yaep.domain.HorizontalClue
+import ch.dissem.yaep.domain.NeighbourClue
+import ch.dissem.yaep.domain.OrderClue
+import ch.dissem.yaep.domain.SameColumnClue
+import ch.dissem.yaep.domain.TripletClue
+import org.jetbrains.compose.resources.painterResource
+import yaep.commonui.generated.resources.Res
+import yaep.commonui.generated.resources.neighbour
+import yaep.commonui.generated.resources.order
+
+fun Modifier.forClue(clue: DisplayClue<out Clue>, padding: Dp = 8.dp): Modifier = this
+    .alpha(if (clue.isActive) 1f else 0.2f)
+    .padding(padding)
+    .onEitherPointerAction { clue.isActive = !clue.isActive }
+
+@Composable
+fun HorizontalClue(
+    modifier: Modifier = Modifier,
+    spacing: Dp,
+    clue: HorizontalClue,
+    isClueViolated: Boolean
+) {
+    ClueCard(
+        modifier = modifier,
+        spacing = spacing,
+        isClueViolated = isClueViolated
+    ) {
+        Row {
+            when (clue) {
+                is NeighbourClue<*, *> -> {
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.a)
+                    Icon(
+                        modifier = Modifier.aspectRatio(1f).weight(1f),
+                        painter = painterResource(Res.drawable.neighbour),
+                        contentDescription = null
+                    )
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.b)
+                }
+
+                is OrderClue<*, *> -> {
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.left)
+                    Icon(
+                        modifier = Modifier.aspectRatio(1f).weight(1f),
+                        painter = painterResource(Res.drawable.order),
+                        contentDescription = null
+                    )
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.right)
+                }
+
+                is TripletClue<*, *, *> -> {
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.a)
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.b)
+                    DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.c)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun VerticalClue(
+    modifier: Modifier = Modifier,
+    spacing: Dp,
+    clue: SameColumnClue<*, *>,
+    isClueViolated: Boolean = false
+) {
+    ClueCard(
+        modifier = modifier.aspectRatio(0.5f),
+        spacing = spacing,
+        isClueViolated = isClueViolated
+    ) {
+        Column {
+            DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.a)
+            DrawItem(modifier = Modifier.weight(1f), spacing = spacing, item = clue.b)
+        }
+    }
+}
+
+@Composable
+fun ClueCard(
+    modifier: Modifier = Modifier,
+    spacing: Dp,
+    isClueViolated: Boolean,
+    content: @Composable () -> Unit
+) {
+    val colors = MaterialTheme.colorScheme
+    OutlinedCard(
+        modifier = if (isClueViolated) {
+            modifier.shadow(
+                8.dp,
+                shape = CardDefaults.outlinedShape,
+                ambientColor = colors.error,
+                spotColor = colors.error
+            )
+        } else {
+            modifier
+        },
+        shape = RoundedCornerShape(spacing),
+        border = if (isClueViolated) {
+            remember { BorderStroke(1.0.dp, colors.error) }
+        } else {
+            CardDefaults.outlinedCardBorder()
+        }
+    ) {
+        content()
+    }
+}
+
+class DisplayClue<C : Clue>(val clue: C) {
+    var isActive: Boolean by mutableStateOf(true)
+
+    var isViolated: Boolean by mutableStateOf(false)
+
+    fun update(grid: Grid) {
+        isViolated = !clue.isValid(grid)
+        if (isViolated) {
+            isActive = true
+        }
+    }
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/end.kt

@@ -0,0 +1,89 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Alignment.Companion.CenterHorizontally
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.graphics.BlurEffect
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import org.jetbrains.compose.resources.stringResource
+import yaep.commonui.generated.resources.Res
+import yaep.commonui.generated.resources.restart
+import yaep.commonui.generated.resources.solved_congrats
+import yaep.commonui.generated.resources.solved_time
+
+@Composable
+fun EndOfGame(
+    modifier: Modifier = Modifier,
+    isSolved: Boolean,
+    time: String,
+    onRestart: () -> Unit
+) {
+    AnimatedVisibility(
+        visible = isSolved,
+        modifier = modifier,
+        enter = fadeIn(),
+        exit = fadeOut()
+    ) {
+        val background = MaterialTheme.colorScheme.background
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .drawBehind {
+                    drawRect(color = background.copy(alpha = 0.8f))
+                }
+        ) {
+            Column(
+                modifier = Modifier
+                    .align(Alignment.Center)
+            ) {
+                Text(
+                    text = stringResource(Res.string.solved_congrats),
+                    fontSize = 128.sp,
+                    textAlign = TextAlign.Center,
+                    modifier = Modifier.fillMaxWidth()
+                        .testTag("EndOfGame.solved_congrats")
+                )
+                Spacer(modifier = Modifier.height(16.dp))
+                Text(
+                    text = stringResource(Res.string.solved_time, time),
+                    fontSize = 64.sp,
+                    textAlign = TextAlign.Center,
+                    modifier = Modifier.fillMaxWidth()
+                        .testTag("EndOfGame.solved_time")
+                )
+                Spacer(modifier = Modifier.height(32.dp))
+                Button(
+                    modifier = Modifier.align(CenterHorizontally)
+                        .testTag("EndOfGame.restart"),
+                    onClick = onRestart
+                ) {
+                    Text(stringResource(Res.string.restart))
+                }
+            }
+        }
+    }
+}
+
+fun Modifier.blurOnFinished(isSolved: Boolean): Modifier = graphicsLayer {
+    if (isSolved) {
+        this.renderEffect = BlurEffect(8f, 8f)
+    }
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/grid.kt

@@ -0,0 +1,129 @@
+package ch.dissem.yaep.ui.common
+
+import SelectionManager
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.wrapContentHeight
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.domain.GameCell
+import ch.dissem.yaep.domain.GameRow
+import ch.dissem.yaep.domain.Grid
+import ch.dissem.yaep.domain.Item
+import ch.dissem.yaep.domain.ItemClass
+import focus
+
+@Composable
+fun PuzzleGrid(
+    modifier: Modifier = Modifier,
+    selectDirectly: Boolean,
+    selectionManager: SelectionManager,
+    spacing: Dp = 8.dp,
+    grid: Grid,
+    onUpdate: () -> Unit
+) {
+    Column(modifier = modifier) {
+        for (row in grid) {
+            PuzzleRow(
+                row = row,
+                onUpdate = onUpdate,
+                onSnapshot = { grid.snapshot() },
+                onUndo = { grid.undo() },
+                spacing = spacing,
+                selectDirectly = selectDirectly,
+                selectionManager = selectionManager
+            )
+        }
+    }
+}
+
+@Composable
+private fun PuzzleRow(
+    row: GameRow<ItemClass<*>>,
+    onUpdate: () -> Unit,
+    onSnapshot: () -> Unit,
+    onUndo: () -> Boolean,
+    spacing: Dp,
+    selectDirectly: Boolean,
+    selectionManager: SelectionManager
+) {
+    val focusableRow = remember { selectionManager.add() }
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .wrapContentHeight()
+    ) {
+        val allOptions = row.options
+        val columnSelectionManager =
+            remember { focusableRow.createChild(Key.DirectionRight, Key.DirectionLeft) }
+        for (cell in row) {
+            val focusableItem = remember { columnSelectionManager.add() }
+            var selection by remember(cell) { mutableStateOf(cell.selection) }
+            val options = remember(cell) {
+                allOptions.map { Toggleable(it, cell.options.contains(it)) }
+            }
+            LaunchedEffect(cell) {
+                cell.optionsChangedListeners.add { enabled ->
+                    options.forEach { it.enabled = enabled.contains(it.item) }
+                }
+                cell.selectionChangedListeners.add {
+                    selection = it
+                    onUpdate()
+                }
+            }
+            Selector(
+                modifier = Modifier
+                    .focus(focusableItem)
+                    .padding(spacing)
+                    .weight(1f),
+                spacing,
+                selectDirectly = selectDirectly,
+                options = options,
+                onOptionRemoved = {
+                    onSnapshot()
+                    cell.options.remove(it)
+                    row.cleanupOptions()
+                },
+                onOptionAdded = {
+                    cell.options.add(it)
+                },
+                selectedItem = selection,
+                onSelectItem = { selectedItem ->
+                    onSelectItem(row, cell, options, selectedItem, onSnapshot, onUndo)
+                }
+            )
+        }
+    }
+}
+
+private fun onSelectItem(
+    row: GameRow<ItemClass<*>>,
+    cell: GameCell<ItemClass<*>>,
+    options: List<Toggleable<Item<ItemClass<*>>>>,
+    selectedItem: Item<ItemClass<*>>?,
+    onSnapshot: () -> Unit,
+    onUndo: () -> Boolean
+) {
+    if (selectedItem != null) {
+        onSnapshot()
+        cell.selection = selectedItem
+        row.cleanupOptions()
+    } else {
+        while (cell.selection != null) {
+            if (!onUndo()) break
+        }
+        options.forEach { option ->
+            option.enabled = cell.options.contains(option.item)
+        }
+    }
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/names.kt

@@ -0,0 +1,163 @@
+package ch.dissem.yaep.ui.common
+
+import ch.dissem.yaep.domain.Animal
+import ch.dissem.yaep.domain.Dessert
+import ch.dissem.yaep.domain.Drink
+import ch.dissem.yaep.domain.Fruit
+import ch.dissem.yaep.domain.ItemClass
+import ch.dissem.yaep.domain.Nationality
+import ch.dissem.yaep.domain.Profession
+import ch.dissem.yaep.domain.Transportation
+import org.jetbrains.compose.resources.StringResource
+import yaep.commonui.generated.resources.Res
+import yaep.commonui.generated.resources.ant
+import yaep.commonui.generated.resources.astronaut
+import yaep.commonui.generated.resources.banana
+import yaep.commonui.generated.resources.bubble_tea
+import yaep.commonui.generated.resources.beverage
+import yaep.commonui.generated.resources.bicycle
+import yaep.commonui.generated.resources.british
+import yaep.commonui.generated.resources.bus
+import yaep.commonui.generated.resources.cake
+import yaep.commonui.generated.resources.canadian
+import yaep.commonui.generated.resources.cherries
+import yaep.commonui.generated.resources.chocolate
+import yaep.commonui.generated.resources.water
+import yaep.commonui.generated.resources.coffee
+import yaep.commonui.generated.resources.cookie
+import yaep.commonui.generated.resources.cupcake
+import yaep.commonui.generated.resources.custard
+import yaep.commonui.generated.resources.dog
+import yaep.commonui.generated.resources.doughnut
+import yaep.commonui.generated.resources.farmer
+import yaep.commonui.generated.resources.firefighter
+import yaep.commonui.generated.resources.goat
+import yaep.commonui.generated.resources.grapes
+import yaep.commonui.generated.resources.health_worker
+import yaep.commonui.generated.resources.ice_cream
+import yaep.commonui.generated.resources.japanese
+import yaep.commonui.generated.resources.kiwi
+import yaep.commonui.generated.resources.lemon
+import yaep.commonui.generated.resources.locomotive
+import yaep.commonui.generated.resources.lollipop
+import yaep.commonui.generated.resources.mango
+import yaep.commonui.generated.resources.milk
+import yaep.commonui.generated.resources.motor_scooter
+import yaep.commonui.generated.resources.norwegian
+import yaep.commonui.generated.resources.octopus
+import yaep.commonui.generated.resources.pear
+import yaep.commonui.generated.resources.pie
+import yaep.commonui.generated.resources.pineapple
+import yaep.commonui.generated.resources.rock_star
+import yaep.commonui.generated.resources.scientist
+import yaep.commonui.generated.resources.skateboard
+import yaep.commonui.generated.resources.sloth
+import yaep.commonui.generated.resources.snail
+import yaep.commonui.generated.resources.software_dev
+import yaep.commonui.generated.resources.spanish
+import yaep.commonui.generated.resources.strawberry
+import yaep.commonui.generated.resources.swedish
+import yaep.commonui.generated.resources.swiss
+import yaep.commonui.generated.resources.taxi
+import yaep.commonui.generated.resources.tea
+import yaep.commonui.generated.resources.teacher
+import yaep.commonui.generated.resources.tram_car
+import yaep.commonui.generated.resources.ukrainian
+import yaep.commonui.generated.resources.watermelon
+import yaep.commonui.generated.resources.mate
+import yaep.commonui.generated.resources.zebra
+
+val ItemClass<*>.localName: StringResource
+    get() = when (this) {
+        is Animal -> this.stringResource
+        is Dessert -> this.stringResource
+        is Drink -> this.stringResource
+        is Fruit -> this.stringResource
+        is Nationality -> this.stringResource
+        is Profession -> this.stringResource
+        is Transportation -> this.stringResource
+    }
+
+private val Animal.stringResource: StringResource
+    get() = when (this) {
+        Animal.ANT -> Res.string.ant
+        Animal.DOG -> Res.string.dog
+        Animal.GOAT -> Res.string.goat
+        Animal.OCTOPUS -> Res.string.octopus
+        Animal.SLOTH -> Res.string.sloth
+        Animal.SNAIL -> Res.string.snail
+        Animal.ZEBRA -> Res.string.zebra
+    }
+
+private val Dessert.stringResource: StringResource
+    get() = when (this) {
+        Dessert.CAKE -> Res.string.cake
+        Dessert.CHOCOLATE -> Res.string.chocolate
+        Dessert.COOKIE -> Res.string.cookie
+        Dessert.CUPCAKE -> Res.string.cupcake
+        Dessert.CUSTARD -> Res.string.custard
+        Dessert.DOUGHNUT -> Res.string.doughnut
+        Dessert.ICE_CREAM -> Res.string.ice_cream
+        Dessert.LOLLIPOP -> Res.string.lollipop
+        Dessert.PIE -> Res.string.pie
+    }
+
+private val Drink.stringResource: StringResource
+    get() = when (this) {
+        Drink.BEVERAGE -> Res.string.beverage
+        Drink.BUBBLE_TEA -> Res.string.bubble_tea
+        Drink.COFFEE -> Res.string.coffee
+        Drink.MATE -> Res.string.mate
+        Drink.MILK -> Res.string.milk
+        Drink.TEA -> Res.string.tea
+        Drink.WATER -> Res.string.water
+    }
+
+private val Fruit.stringResource: StringResource
+    get() = when (this) {
+        Fruit.BANANA -> Res.string.banana
+        Fruit.CHERRIES -> Res.string.cherries
+        Fruit.GRAPES -> Res.string.grapes
+        Fruit.KIWI -> Res.string.kiwi
+        Fruit.LEMON -> Res.string.lemon
+        Fruit.MANGO -> Res.string.mango
+        Fruit.PEAR -> Res.string.pear
+        Fruit.PINEAPPLE -> Res.string.pineapple
+        Fruit.STRAWBERRY -> Res.string.strawberry
+        Fruit.WATERMELON -> Res.string.watermelon
+    }
+
+private val Nationality.stringResource: StringResource
+    get() = when (this) {
+        Nationality.CANADA -> Res.string.canadian
+        Nationality.JAPAN -> Res.string.japanese
+        Nationality.NORWAY -> Res.string.norwegian
+        Nationality.SPAIN -> Res.string.spanish
+        Nationality.SWEDEN -> Res.string.swedish
+        Nationality.SWITZERLAND -> Res.string.swiss
+        Nationality.UNITED_KINGDOM -> Res.string.british
+        Nationality.UKRAINE -> Res.string.ukrainian
+    }
+
+private val Profession.stringResource: StringResource
+    get() = when (this) {
+        Profession.ASTRONAUT -> Res.string.astronaut
+        Profession.FARMER -> Res.string.farmer
+        Profession.FIREFIGHTER -> Res.string.firefighter
+        Profession.HEALTH_WORKER -> Res.string.health_worker
+        Profession.ROCK_STAR -> Res.string.rock_star
+        Profession.SCIENTIST -> Res.string.scientist
+        Profession.SOFTWARE_DEV -> Res.string.software_dev
+        Profession.TEACHER -> Res.string.teacher
+    }
+
+private val Transportation.stringResource: StringResource
+    get() = when (this) {
+        Transportation.BICYCLE -> Res.string.bicycle
+        Transportation.BUS -> Res.string.bus
+        Transportation.LOCOMOTIVE -> Res.string.locomotive
+        Transportation.MOTOR_SCOOTER -> Res.string.motor_scooter
+        Transportation.SKATEBOARD -> Res.string.skateboard
+        Transportation.TAXI -> Res.string.taxi
+        Transportation.TRAM_CAR -> Res.string.tram_car
+    }

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/pointer utils.kt

@@ -0,0 +1,8 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.ui.Modifier
+
+expect fun Modifier.onPointerAction(primary: () -> Unit = {}, secondary: () -> Unit = {}): Modifier
+
+fun Modifier.onEitherPointerAction(action: () -> Unit): Modifier =
+    onPointerAction(primary = action, secondary = action)

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/puzzle clues.kt

@@ -0,0 +1,136 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedCard
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.domain.Clue
+import ch.dissem.yaep.domain.Grid
+import ch.dissem.yaep.domain.HorizontalClue
+import ch.dissem.yaep.domain.NeighbourClue
+import ch.dissem.yaep.domain.OrderClue
+import ch.dissem.yaep.domain.SameColumnClue
+import ch.dissem.yaep.domain.TripletClue
+import org.jetbrains.compose.resources.painterResource
+import yaep.commonui.generated.resources.Res
+import yaep.commonui.generated.resources.neighbour
+import yaep.commonui.generated.resources.order
+
+class DisplayClue<C : Clue>(val clue: C) {
+    var isActive: Boolean by mutableStateOf(true)
+
+    var isViolated: Boolean by mutableStateOf(false)
+
+    fun update(grid: Grid) {
+        isViolated = !clue.isValid(grid)
+        if (isViolated) {
+            isActive = true
+        }
+    }
+}
+
+internal fun Modifier.forClue(clue: DisplayClue<out Clue>): Modifier = this
+    .alpha(if (clue.isActive) 1f else 0.2f)
+    .padding(8.dp)
+    .onEitherPointerAction { clue.isActive = !clue.isActive }
+
+@Composable
+fun HorizontalClue(
+    modifier: Modifier = Modifier,
+    clue: HorizontalClue,
+    isClueViolated: Boolean
+) {
+    ClueCard(
+        modifier = modifier,
+        isClueViolated = isClueViolated
+    ) {
+        Row {
+            when (clue) {
+                is NeighbourClue<*, *> -> {
+                    DrawItem(modifier = Modifier.weight(1f), clue.a)
+                    Image(
+                        modifier = Modifier.aspectRatio(1f).weight(1f),
+                        painter = painterResource(Res.drawable.neighbour),
+                        contentDescription = null
+                    )
+                    DrawItem(modifier = Modifier.weight(1f), clue.b)
+                }
+
+                is OrderClue<*, *> -> {
+                    DrawItem(modifier = Modifier.weight(1f), clue.left)
+                    Image(
+                        modifier = Modifier.aspectRatio(1f).weight(1f),
+                        painter = painterResource(Res.drawable.order),
+                        contentDescription = null
+                    )
+                    DrawItem(modifier = Modifier.weight(1f), clue.right)
+                }
+
+                is TripletClue<*, *, *> -> {
+                    DrawItem(modifier = Modifier.weight(1f), clue.a)
+                    DrawItem(modifier = Modifier.weight(1f), clue.b)
+                    DrawItem(modifier = Modifier.weight(1f), clue.c)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun VerticalClue(
+    modifier: Modifier = Modifier,
+    clue: SameColumnClue<*, *>,
+    isClueViolated: Boolean = false
+) {
+    ClueCard(
+        modifier = modifier.aspectRatio(0.5f),
+        isClueViolated = isClueViolated
+    ) {
+        Column {
+            DrawItem(modifier = Modifier.weight(1f), clue.a)
+            DrawItem(modifier = Modifier.weight(1f), clue.b)
+        }
+    }
+}
+
+@Composable
+fun ClueCard(
+    modifier: Modifier = Modifier,
+    isClueViolated: Boolean,
+    content: @Composable () -> Unit
+) {
+    val colors = MaterialTheme.colorScheme
+    OutlinedCard(
+        modifier = if (isClueViolated) {
+            modifier.shadow(
+                8.dp,
+                shape = CardDefaults.outlinedShape,
+                ambientColor = colors.error,
+                spotColor = colors.error
+            )
+        } else {
+            modifier
+        },
+        border = if (isClueViolated) {
+            remember { BorderStroke(1.0.dp, colors.error) }
+        } else {
+            CardDefaults.outlinedCardBorder()
+        }
+    ) {
+        content()
+    }
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/puzzle grid.kt

@@ -0,0 +1,88 @@
+package ch.dissem.yaep.ui.common
+
+import SelectionManager
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.wrapContentHeight
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.domain.Grid
+import focus
+
+@Composable
+fun PuzzleGrid(
+    modifier: Modifier = Modifier,
+    selectionManager: SelectionManager,
+    grid: Grid,
+    onUpdate: () -> Unit
+) {
+    Column(modifier = modifier) {
+        for (row in grid) {
+            val focusableRow = remember { selectionManager.add() }
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .wrapContentHeight()
+            ) {
+                val allOptions = row.options
+                val columnSelectionManager =
+                    remember { focusableRow.createChild(Key.DirectionRight, Key.DirectionLeft) }
+                for (item in row) {
+                    val focusableItem = remember { columnSelectionManager.add() }
+                    var selection by remember(item) { mutableStateOf(item.selection) }
+                    val options = remember(item) {
+                        allOptions.map { Toggleable(it, item.options.contains(it)) }
+                    }
+                    LaunchedEffect(item) {
+                        item.optionsChangedListeners.add { enabled ->
+                            options.forEach { it.enabled = enabled.contains(it.item) }
+                        }
+                        item.selectionChangedListeners.add {
+                            selection = it
+                            onUpdate()
+                        }
+                    }
+                    Selector(
+                        modifier = Modifier
+                            .focus(focusableItem)
+                            .padding(8.dp)
+                            .weight(1f),
+                        options = options,
+                        onOptionRemoved = {
+                            grid.snapshot()
+                            item.options.remove(it)
+                            row.cleanupOptions()
+                        },
+                        onOptionAdded = {
+                            item.options.add(it)
+                        },
+                        selectedItem = selection,
+                        onSelectItem = {
+                            if (it != null) {
+                                grid.snapshot()
+                                item.selection = it
+                                row.cleanupOptions()
+                            } else {
+                                while (item.selection != null) {
+                                    if (!grid.undo()) break
+                                }
+                                options.forEach {
+                                    it.enabled = item.options.contains(it.item)
+                                }
+                            }
+                        }
+                    )
+                }
+            }
+        }
+    }
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/selector.kt

@@ -0,0 +1,145 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.OutlinedCard
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.drawText
+import androidx.compose.ui.text.rememberTextMeasurer
+import androidx.compose.ui.unit.Dp
+import ch.dissem.yaep.domain.Item
+import ch.dissem.yaep.domain.ItemClass
+import ch.dissem.yaep.ui.common.theme.emojiFontFamily
+import kotlin.math.min
+
+@Composable
+fun <C : ItemClass<C>> Selector(
+    modifier: Modifier = Modifier,
+    spacing: Dp,
+    selectDirectly: Boolean,
+    options: List<Toggleable<Item<C>>>,
+    onOptionRemoved: (Item<C>) -> Unit,
+    onOptionAdded: (Item<C>) -> Unit,
+    selectedItem: Item<C>?,
+    onSelectItem: (Item<C>?) -> Unit,
+) {
+    val radius = spacing * 1.5f
+    if (selectedItem != null) {
+        DrawItem(
+            item = selectedItem,
+            modifier = modifier.clickable { onSelectItem(null) },
+            spacing = radius
+        )
+    } else {
+        OutlinedCard(
+            modifier = modifier.aspectRatio(1f),
+            shape = RoundedCornerShape(radius)
+        ) {
+            LazyVerticalGrid(
+                columns = GridCells.Fixed(3),
+                verticalArrangement = Arrangement.Center,
+                horizontalArrangement = Arrangement.Center
+            ) {
+                for (option in options) {
+                    item {
+                        DrawItem(
+                            item = option.item,
+                            modifier = Modifier
+                                .alpha(if (option.enabled) 1f else 0.1f)
+                                .onPointerAction(
+                                    primary = { onSelectItem(option.item) },
+                                    secondary = {
+                                        if (option.enabled) {
+                                            option.enabled = false
+                                            onOptionRemoved(option.item)
+                                        } else {
+                                            option.enabled = true
+                                            onOptionAdded(option.item)
+                                        }
+                                    }
+                                ),
+                            spacing = radius
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun <C : ItemClass<C>> DrawItem(
+    modifier: Modifier = Modifier,
+    spacing: Dp,
+    item: Item<C>
+) {
+    OutlinedCard(modifier = modifier.aspectRatio(1f), shape = RoundedCornerShape(spacing)) {
+        val emoji = item.symbol
+
+        val textMeasurer = rememberTextMeasurer()
+
+        Canvas(
+            modifier = Modifier.fillMaxSize(1f),
+            onDraw = {
+                val textSize = textMeasurer.measure(text = emoji)
+                val minTextSizeDimension = min(
+                    textSize.size.width,
+                    textSize.size.height
+                )
+                val fontSizeBase = minTextSizeDimension * min(
+                    size.width / textSize.size.width,
+                    size.height / textSize.size.height
+                )
+                val fontSize = (0.9f * fontSizeBase).toDp().toSp()
+
+                val offset = Offset(
+                    x = size.width / 2 - textSize.size.width * fontSizeBase / (2f * minTextSizeDimension),
+                    y = size.height / 2 - textSize.size.height * fontSizeBase / (2f * minTextSizeDimension)
+                )
+                drawText(
+                    textMeasurer = textMeasurer,
+                    text = emoji,
+                    style = TextStyle(
+                        fontSize = fontSize,
+                        fontFamily = emojiFontFamily ?: TextStyle.Default.fontFamily
+                    ),
+                    topLeft = offset
+                )
+            }
+        )
+    }
+}
+
+class Toggleable<T>(val item: T, enabled: Boolean = true) {
+
+    var enabled: Boolean by mutableStateOf(enabled)
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is Toggleable<*>) return false
+
+        if (item != other.item) return false
+        if (enabled != other.enabled) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = item.hashCode()
+        result = 31 * result + enabled.hashCode()
+        return result
+    }
+}

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/theme/Color.kt

@@ -0,0 +1,225 @@
+package ch.dissem.yaep.ui.common.theme
+import androidx.compose.ui.graphics.Color
+
+val primaryLight = Color(0xFF6D5E0F)
+val onPrimaryLight = Color(0xFFFFFFFF)
+val primaryContainerLight = Color(0xFFF8E287)
+val onPrimaryContainerLight = Color(0xFF221B00)
+val secondaryLight = Color(0xFF665E40)
+val onSecondaryLight = Color(0xFFFFFFFF)
+val secondaryContainerLight = Color(0xFFEEE2BC)
+val onSecondaryContainerLight = Color(0xFF211B04)
+val tertiaryLight = Color(0xFF166683)
+val onTertiaryLight = Color(0xFFFFFFFF)
+val tertiaryContainerLight = Color(0xFFC0E8FF)
+val onTertiaryContainerLight = Color(0xFF001E2B)
+val errorLight = Color(0xFFBA1A1A)
+val onErrorLight = Color(0xFFFFFFFF)
+val errorContainerLight = Color(0xFFFFDAD6)
+val onErrorContainerLight = Color(0xFF410002)
+val backgroundLight = Color(0xFFFFF9EE)
+val onBackgroundLight = Color(0xFF1E1B13)
+val surfaceLight = Color(0xFFFFF9EE)
+val onSurfaceLight = Color(0xFF1E1B13)
+val surfaceVariantLight = Color(0xFFEAE2D0)
+val onSurfaceVariantLight = Color(0xFF4B4739)
+val outlineLight = Color(0xFF7C7767)
+val outlineVariantLight = Color(0xFFCDC6B4)
+val scrimLight = Color(0xFF000000)
+val inverseSurfaceLight = Color(0xFF333027)
+val inverseOnSurfaceLight = Color(0xFFF7F0E2)
+val inversePrimaryLight = Color(0xFFDBC66E)
+val surfaceDimLight = Color(0xFFE0D9CC)
+val surfaceBrightLight = Color(0xFFFFF9EE)
+val surfaceContainerLowestLight = Color(0xFFFFFFFF)
+val surfaceContainerLowLight = Color(0xFFFAF3E5)
+val surfaceContainerLight = Color(0xFFF4EDDF)
+val surfaceContainerHighLight = Color(0xFFEEE8DA)
+val surfaceContainerHighestLight = Color(0xFFE8E2D4)
+
+val primaryLightMediumContrast = Color(0xFF4F4200)
+val onPrimaryLightMediumContrast = Color(0xFFFFFFFF)
+val primaryContainerLightMediumContrast = Color(0xFF857425)
+val onPrimaryContainerLightMediumContrast = Color(0xFFFFFFFF)
+val secondaryLightMediumContrast = Color(0xFF4A4327)
+val onSecondaryLightMediumContrast = Color(0xFFFFFFFF)
+val secondaryContainerLightMediumContrast = Color(0xFF7D7455)
+val onSecondaryContainerLightMediumContrast = Color(0xFFFFFFFF)
+val tertiaryLightMediumContrast = Color(0xFF004960)
+val onTertiaryLightMediumContrast = Color(0xFFFFFFFF)
+val tertiaryContainerLightMediumContrast = Color(0xFF357C9B)
+val onTertiaryContainerLightMediumContrast = Color(0xFFFFFFFF)
+val errorLightMediumContrast = Color(0xFF8C0009)
+val onErrorLightMediumContrast = Color(0xFFFFFFFF)
+val errorContainerLightMediumContrast = Color(0xFFDA342E)
+val onErrorContainerLightMediumContrast = Color(0xFFFFFFFF)
+val backgroundLightMediumContrast = Color(0xFFFFF9EE)
+val onBackgroundLightMediumContrast = Color(0xFF1E1B13)
+val surfaceLightMediumContrast = Color(0xFFFFF9EE)
+val onSurfaceLightMediumContrast = Color(0xFF1E1B13)
+val surfaceVariantLightMediumContrast = Color(0xFFEAE2D0)
+val onSurfaceVariantLightMediumContrast = Color(0xFF474335)
+val outlineLightMediumContrast = Color(0xFF645F50)
+val outlineVariantLightMediumContrast = Color(0xFF807A6B)
+val scrimLightMediumContrast = Color(0xFF000000)
+val inverseSurfaceLightMediumContrast = Color(0xFF333027)
+val inverseOnSurfaceLightMediumContrast = Color(0xFFF7F0E2)
+val inversePrimaryLightMediumContrast = Color(0xFFDBC66E)
+val surfaceDimLightMediumContrast = Color(0xFFE0D9CC)
+val surfaceBrightLightMediumContrast = Color(0xFFFFF9EE)
+val surfaceContainerLowestLightMediumContrast = Color(0xFFFFFFFF)
+val surfaceContainerLowLightMediumContrast = Color(0xFFFAF3E5)
+val surfaceContainerLightMediumContrast = Color(0xFFF4EDDF)
+val surfaceContainerHighLightMediumContrast = Color(0xFFEEE8DA)
+val surfaceContainerHighestLightMediumContrast = Color(0xFFE8E2D4)
+
+val primaryLightHighContrast = Color(0xFF292200)
+val onPrimaryLightHighContrast = Color(0xFFFFFFFF)
+val primaryContainerLightHighContrast = Color(0xFF4F4200)
+val onPrimaryContainerLightHighContrast = Color(0xFFFFFFFF)
+val secondaryLightHighContrast = Color(0xFF282209)
+val onSecondaryLightHighContrast = Color(0xFFFFFFFF)
+val secondaryContainerLightHighContrast = Color(0xFF4A4327)
+val onSecondaryContainerLightHighContrast = Color(0xFFFFFFFF)
+val tertiaryLightHighContrast = Color(0xFF002634)
+val onTertiaryLightHighContrast = Color(0xFFFFFFFF)
+val tertiaryContainerLightHighContrast = Color(0xFF004960)
+val onTertiaryContainerLightHighContrast = Color(0xFFFFFFFF)
+val errorLightHighContrast = Color(0xFF4E0002)
+val onErrorLightHighContrast = Color(0xFFFFFFFF)
+val errorContainerLightHighContrast = Color(0xFF8C0009)
+val onErrorContainerLightHighContrast = Color(0xFFFFFFFF)
+val backgroundLightHighContrast = Color(0xFFFFF9EE)
+val onBackgroundLightHighContrast = Color(0xFF1E1B13)
+val surfaceLightHighContrast = Color(0xFFFFF9EE)
+val onSurfaceLightHighContrast = Color(0xFF000000)
+val surfaceVariantLightHighContrast = Color(0xFFEAE2D0)
+val onSurfaceVariantLightHighContrast = Color(0xFF272418)
+val outlineLightHighContrast = Color(0xFF474335)
+val outlineVariantLightHighContrast = Color(0xFF474335)
+val scrimLightHighContrast = Color(0xFF000000)
+val inverseSurfaceLightHighContrast = Color(0xFF333027)
+val inverseOnSurfaceLightHighContrast = Color(0xFFFFFFFF)
+val inversePrimaryLightHighContrast = Color(0xFFFFECA2)
+val surfaceDimLightHighContrast = Color(0xFFE0D9CC)
+val surfaceBrightLightHighContrast = Color(0xFFFFF9EE)
+val surfaceContainerLowestLightHighContrast = Color(0xFFFFFFFF)
+val surfaceContainerLowLightHighContrast = Color(0xFFFAF3E5)
+val surfaceContainerLightHighContrast = Color(0xFFF4EDDF)
+val surfaceContainerHighLightHighContrast = Color(0xFFEEE8DA)
+val surfaceContainerHighestLightHighContrast = Color(0xFFE8E2D4)
+
+val primaryDark = Color(0xFFDBC66E)
+val onPrimaryDark = Color(0xFF3A3000)
+val primaryContainerDark = Color(0xFF534600)
+val onPrimaryContainerDark = Color(0xFFF8E287)
+val secondaryDark = Color(0xFFD1C6A1)
+val onSecondaryDark = Color(0xFF363016)
+val secondaryContainerDark = Color(0xFF4E472A)
+val onSecondaryContainerDark = Color(0xFFEEE2BC)
+val tertiaryDark = Color(0xFF8DCFF1)
+val onTertiaryDark = Color(0xFF003547)
+val tertiaryContainerDark = Color(0xFF004D66)
+val onTertiaryContainerDark = Color(0xFFC0E8FF)
+val errorDark = Color(0xFFFFB4AB)
+val onErrorDark = Color(0xFF690005)
+val errorContainerDark = Color(0xFF93000A)
+val onErrorContainerDark = Color(0xFFFFDAD6)
+val backgroundDark = Color(0xFF15130B)
+val onBackgroundDark = Color(0xFFE8E2D4)
+val surfaceDark = Color(0xFF15130B)
+val onSurfaceDark = Color(0xFFE8E2D4)
+val surfaceVariantDark = Color(0xFF4B4739)
+val onSurfaceVariantDark = Color(0xFFCDC6B4)
+val outlineDark = Color(0xFF969080)
+val outlineVariantDark = Color(0xFF4B4739)
+val scrimDark = Color(0xFF000000)
+val inverseSurfaceDark = Color(0xFFE8E2D4)
+val inverseOnSurfaceDark = Color(0xFF333027)
+val inversePrimaryDark = Color(0xFF6D5E0F)
+val surfaceDimDark = Color(0xFF15130B)
+val surfaceBrightDark = Color(0xFF3C3930)
+val surfaceContainerLowestDark = Color(0xFF100E07)
+val surfaceContainerLowDark = Color(0xFF1E1B13)
+val surfaceContainerDark = Color(0xFF222017)
+val surfaceContainerHighDark = Color(0xFF2D2A21)
+val surfaceContainerHighestDark = Color(0xFF38352B)
+
+val primaryDarkMediumContrast = Color(0xFFE0CA72)
+val onPrimaryDarkMediumContrast = Color(0xFF1C1600)
+val primaryContainerDarkMediumContrast = Color(0xFFA3903F)
+val onPrimaryContainerDarkMediumContrast = Color(0xFF000000)
+val secondaryDarkMediumContrast = Color(0xFFD6CAA5)
+val onSecondaryDarkMediumContrast = Color(0xFF1B1602)
+val secondaryContainerDarkMediumContrast = Color(0xFF9A916F)
+val onSecondaryContainerDarkMediumContrast = Color(0xFF000000)
+val tertiaryDarkMediumContrast = Color(0xFF91D3F5)
+val onTertiaryDarkMediumContrast = Color(0xFF001924)
+val tertiaryContainerDarkMediumContrast = Color(0xFF5599B8)
+val onTertiaryContainerDarkMediumContrast = Color(0xFF000000)
+val errorDarkMediumContrast = Color(0xFFFFBAB1)
+val onErrorDarkMediumContrast = Color(0xFF370001)
+val errorContainerDarkMediumContrast = Color(0xFFFF5449)
+val onErrorContainerDarkMediumContrast = Color(0xFF000000)
+val backgroundDarkMediumContrast = Color(0xFF15130B)
+val onBackgroundDarkMediumContrast = Color(0xFFE8E2D4)
+val surfaceDarkMediumContrast = Color(0xFF15130B)
+val onSurfaceDarkMediumContrast = Color(0xFFFFFAF5)
+val surfaceVariantDarkMediumContrast = Color(0xFF4B4739)
+val onSurfaceVariantDarkMediumContrast = Color(0xFFD1CAB8)
+val outlineDarkMediumContrast = Color(0xFFA9A292)
+val outlineVariantDarkMediumContrast = Color(0xFF888373)
+val scrimDarkMediumContrast = Color(0xFF000000)
+val inverseSurfaceDarkMediumContrast = Color(0xFFE8E2D4)
+val inverseOnSurfaceDarkMediumContrast = Color(0xFF2D2A21)
+val inversePrimaryDarkMediumContrast = Color(0xFF554700)
+val surfaceDimDarkMediumContrast = Color(0xFF15130B)
+val surfaceBrightDarkMediumContrast = Color(0xFF3C3930)
+val surfaceContainerLowestDarkMediumContrast = Color(0xFF100E07)
+val surfaceContainerLowDarkMediumContrast = Color(0xFF1E1B13)
+val surfaceContainerDarkMediumContrast = Color(0xFF222017)
+val surfaceContainerHighDarkMediumContrast = Color(0xFF2D2A21)
+val surfaceContainerHighestDarkMediumContrast = Color(0xFF38352B)
+
+val primaryDarkHighContrast = Color(0xFFFFFAF5)
+val onPrimaryDarkHighContrast = Color(0xFF000000)
+val primaryContainerDarkHighContrast = Color(0xFFE0CA72)
+val onPrimaryContainerDarkHighContrast = Color(0xFF000000)
+val secondaryDarkHighContrast = Color(0xFFFFFAF5)
+val onSecondaryDarkHighContrast = Color(0xFF000000)
+val secondaryContainerDarkHighContrast = Color(0xFFD6CAA5)
+val onSecondaryContainerDarkHighContrast = Color(0xFF000000)
+val tertiaryDarkHighContrast = Color(0xFFF7FBFF)
+val onTertiaryDarkHighContrast = Color(0xFF000000)
+val tertiaryContainerDarkHighContrast = Color(0xFF91D3F5)
+val onTertiaryContainerDarkHighContrast = Color(0xFF000000)
+val errorDarkHighContrast = Color(0xFFFFF9F9)
+val onErrorDarkHighContrast = Color(0xFF000000)
+val errorContainerDarkHighContrast = Color(0xFFFFBAB1)
+val onErrorContainerDarkHighContrast = Color(0xFF000000)
+val backgroundDarkHighContrast = Color(0xFF15130B)
+val onBackgroundDarkHighContrast = Color(0xFFE8E2D4)
+val surfaceDarkHighContrast = Color(0xFF15130B)
+val onSurfaceDarkHighContrast = Color(0xFFFFFFFF)
+val surfaceVariantDarkHighContrast = Color(0xFF4B4739)
+val onSurfaceVariantDarkHighContrast = Color(0xFFFFFAF5)
+val outlineDarkHighContrast = Color(0xFFD1CAB8)
+val outlineVariantDarkHighContrast = Color(0xFFD1CAB8)
+val scrimDarkHighContrast = Color(0xFF000000)
+val inverseSurfaceDarkHighContrast = Color(0xFFE8E2D4)
+val inverseOnSurfaceDarkHighContrast = Color(0xFF000000)
+val inversePrimaryDarkHighContrast = Color(0xFF322A00)
+val surfaceDimDarkHighContrast = Color(0xFF15130B)
+val surfaceBrightDarkHighContrast = Color(0xFF3C3930)
+val surfaceContainerLowestDarkHighContrast = Color(0xFF100E07)
+val surfaceContainerLowDarkHighContrast = Color(0xFF1E1B13)
+val surfaceContainerDarkHighContrast = Color(0xFF222017)
+val surfaceContainerHighDarkHighContrast = Color(0xFF2D2A21)
+val surfaceContainerHighestDarkHighContrast = Color(0xFF38352B)
+
+
+
+
+
+
+

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/theme/Theme.kt

@@ -0,0 +1,100 @@
+package ch.dissem.yaep.ui.common.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+
+private val lightScheme = lightColorScheme(
+    primary = primaryLight,
+    onPrimary = onPrimaryLight,
+    primaryContainer = primaryContainerLight,
+    onPrimaryContainer = onPrimaryContainerLight,
+    secondary = secondaryLight,
+    onSecondary = onSecondaryLight,
+    secondaryContainer = secondaryContainerLight,
+    onSecondaryContainer = onSecondaryContainerLight,
+    tertiary = tertiaryLight,
+    onTertiary = onTertiaryLight,
+    tertiaryContainer = tertiaryContainerLight,
+    onTertiaryContainer = onTertiaryContainerLight,
+    error = errorLight,
+    onError = onErrorLight,
+    errorContainer = errorContainerLight,
+    onErrorContainer = onErrorContainerLight,
+    background = backgroundLight,
+    onBackground = onBackgroundLight,
+    surface = surfaceLight,
+    onSurface = onSurfaceLight,
+    surfaceVariant = surfaceVariantLight,
+    onSurfaceVariant = onSurfaceVariantLight,
+    outline = outlineLight,
+    outlineVariant = outlineVariantLight,
+    scrim = scrimLight,
+    inverseSurface = inverseSurfaceLight,
+    inverseOnSurface = inverseOnSurfaceLight,
+    inversePrimary = inversePrimaryLight,
+    surfaceDim = surfaceDimLight,
+    surfaceBright = surfaceBrightLight,
+    surfaceContainerLowest = surfaceContainerLowestLight,
+    surfaceContainerLow = surfaceContainerLowLight,
+    surfaceContainer = surfaceContainerLight,
+    surfaceContainerHigh = surfaceContainerHighLight,
+    surfaceContainerHighest = surfaceContainerHighestLight,
+)
+
+private val darkScheme = darkColorScheme(
+    primary = primaryDark,
+    onPrimary = onPrimaryDark,
+    primaryContainer = primaryContainerDark,
+    onPrimaryContainer = onPrimaryContainerDark,
+    secondary = secondaryDark,
+    onSecondary = onSecondaryDark,
+    secondaryContainer = secondaryContainerDark,
+    onSecondaryContainer = onSecondaryContainerDark,
+    tertiary = tertiaryDark,
+    onTertiary = onTertiaryDark,
+    tertiaryContainer = tertiaryContainerDark,
+    onTertiaryContainer = onTertiaryContainerDark,
+    error = errorDark,
+    onError = onErrorDark,
+    errorContainer = errorContainerDark,
+    onErrorContainer = onErrorContainerDark,
+    background = backgroundDark,
+    onBackground = onBackgroundDark,
+    surface = surfaceDark,
+    onSurface = onSurfaceDark,
+    surfaceVariant = surfaceVariantDark,
+    onSurfaceVariant = onSurfaceVariantDark,
+    outline = outlineDark,
+    outlineVariant = outlineVariantDark,
+    scrim = scrimDark,
+    inverseSurface = inverseSurfaceDark,
+    inverseOnSurface = inverseOnSurfaceDark,
+    inversePrimary = inversePrimaryDark,
+    surfaceDim = surfaceDimDark,
+    surfaceBright = surfaceBrightDark,
+    surfaceContainerLowest = surfaceContainerLowestDark,
+    surfaceContainerLow = surfaceContainerLowDark,
+    surfaceContainer = surfaceContainerDark,
+    surfaceContainerHigh = surfaceContainerHighDark,
+    surfaceContainerHighest = surfaceContainerHighestDark,
+)
+
+@Composable
+fun AppTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    content: @Composable() () -> Unit
+) {
+    val colorScheme = when {
+        darkTheme -> darkScheme
+        else -> lightScheme
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        content = content
+    )
+}
+

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/theme/Type.kt

@@ -0,0 +1,52 @@
+package ch.dissem.yaep.ui.common.theme
+
+//import androidx.compose.material3.Typography
+//import androidx.compose.ui.text.TextStyle
+//import androidx.compose.ui.text.font.FontFamily
+//import androidx.compose.ui.text.font.FontWeight
+//import androidx.compose.ui.unit.sp
+//
+//import androidx.compose.ui.text.googlefonts.GoogleFont
+//import androidx.compose.ui.text.googlefonts.Font
+//
+//val provider = GoogleFont.Provider(
+//    providerAuthority = "com.google.android.gms.fonts",
+//    providerPackage = "com.google.android.gms",
+//    certificates = "MIIEqDCCA5CgAwIBAgIJANWFuGx90071MA0GCSqGSIb3DQEBBAUAMIGUMQswCQYDVQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4gVmlldzEQMA4GA1UEChMHQW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UEAxMHQW5kcm9pZDEiMCAGCSqGSIb3DQEJARYTYW5kcm9pZEBhbmRyb2lkLmNvbTAeFw0wODA0MTUyMzM2NTZaFw0zNTA5MDEyMzM2NTZaMIGUMQswCQYDVQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4gVmlldzEQMA4GA1UEChMHQW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UEAxMHQW5kcm9pZDEiMCAGCSqGSIb3DQEJARYTYW5kcm9pZEBhbmRyb2lkLmNvbTCCASAwDQYJKoZIhvcNAQEBBQADggENADCCAQgCggEBANbOLggKv+IxTdGNs8/TGFy0PTP6DHThvbbR24kT9ixcOd9W+EaBPWW+wPPKQmsHxajtWjmQwWfna8mZuSeJS48LIgAZlKkpFeVyxW0qMBujb8X8ETrWy550NaFtI6t9+u7hZeTfHwqNvacKhp1RbE6dBRGWynwMVX8XW8N1+UjFaq6GCJukT4qmpN2afb8sCjUigq0GuMwYXrFVee74bQgLHWGJwPmvmLHC69EH6kWr22ijx4OKXlSIx2xT1AsSHee70w5iDBiK4aph27yH3TxkXy9V89TDdexAcKk/cVHYNnDBapcavl7y0RiQ4biu8ymM8Ga/nmzhRKya6G0cGw8CAQOjgfwwgfkwHQYDVR0OBBYEFI0cxb6VTEM8YYY6FbBMvAPyT+CyMIHJBgNVHSMEgcEwgb6AFI0cxb6VTEM8YYY6FbBMvAPyT+CyoYGapIGXMIGUMQswCQYDVQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4gVmlldzEQMA4GA1UEChMHQW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UEAxMHQW5kcm9pZDEiMCAGCSqGSIb3DQEJARYTYW5kcm9pZEBhbmRyb2lkLmNvbYIJANWFuGx90071MAwGA1UdEwQFMAMBAf8wDQYJKoZIhvcNAQEEBQADggEBABnTDPEF+3iSP0wNfdIjIz1AlnrPzgAIHVvXxunW7SBrDhEglQZBbKJEk5kT0mtKoOD1JMrSu1xuTKEBahWRbqHsXclaXjoBADb0kkjVEJu/Lh5hgYZnOjvlba8Ld7HCKePCVePoTJBdI4fvugnL8TsgK05aIskyY0hKI9L8KfqfGTl1lzOv2KoWD0KWwtAWPoGChZxmQ+nBli+gwYMzM1vAkP+aayLe0a1EQimlOalO762r0GXO0ks+UeXde2Z4e+8S/pf7pITEI/tP+MxJTALw9QUWEv9lKTk+jkbqxbsh8nfBUapfKqYn0eidpwq2AzVp3juYl7//fKnaPhJD9gs="
+//)
+//
+//val bodyFontFamily = FontFamily(
+//    Font(
+//        googleFont = GoogleFont("Roboto"),
+//        fontProvider = provider,
+//    )
+//)
+//
+//val displayFontFamily = FontFamily(
+//    Font(
+//        googleFont = GoogleFont("Shadows Into Light Two"),
+//        fontProvider = provider,
+//    )
+//)
+//
+//// Default Material 3 typography values
+//val baseline = Typography()
+//
+//val AppTypography = Typography(
+//    displayLarge = baseline.displayLarge.copy(fontFamily = displayFontFamily),
+//    displayMedium = baseline.displayMedium.copy(fontFamily = displayFontFamily),
+//    displaySmall = baseline.displaySmall.copy(fontFamily = displayFontFamily),
+//    headlineLarge = baseline.headlineLarge.copy(fontFamily = displayFontFamily),
+//    headlineMedium = baseline.headlineMedium.copy(fontFamily = displayFontFamily),
+//    headlineSmall = baseline.headlineSmall.copy(fontFamily = displayFontFamily),
+//    titleLarge = baseline.titleLarge.copy(fontFamily = displayFontFamily),
+//    titleMedium = baseline.titleMedium.copy(fontFamily = displayFontFamily),
+//    titleSmall = baseline.titleSmall.copy(fontFamily = displayFontFamily),
+//    bodyLarge = baseline.bodyLarge.copy(fontFamily = bodyFontFamily),
+//    bodyMedium = baseline.bodyMedium.copy(fontFamily = bodyFontFamily),
+//    bodySmall = baseline.bodySmall.copy(fontFamily = bodyFontFamily),
+//    labelLarge = baseline.labelLarge.copy(fontFamily = bodyFontFamily),
+//    labelMedium = baseline.labelMedium.copy(fontFamily = bodyFontFamily),
+//    labelSmall = baseline.labelSmall.copy(fontFamily = bodyFontFamily),
+//)
+

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/theme/emoji.kt

@@ -0,0 +1,5 @@
+package ch.dissem.yaep.ui.common.theme
+
+import androidx.compose.ui.text.font.FontFamily
+
+var emojiFontFamily: FontFamily? = null

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/widget status.kt

@@ -0,0 +1,128 @@
+import androidx.compose.foundation.border
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.RectangleShape
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEvent
+import androidx.compose.ui.input.key.KeyEventType
+import androidx.compose.ui.input.key.isShiftPressed
+import androidx.compose.ui.input.key.key
+import androidx.compose.ui.input.key.type
+import androidx.compose.ui.unit.dp
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.combine
+import kotlin.IllegalStateException
+
+class SelectionManager(
+    val keyNext: Key,
+    val keyPrevious: Key? = null
+) {
+    var isActiveFlow = MutableStateFlow<Boolean>(false)
+    var isActive: Boolean
+        get() = isActiveFlow.value
+        set(value) {
+            isActiveFlow.value = value
+        }
+
+    var focusedFlow = MutableStateFlow<Focusable?>(null)
+
+    var focused: Focusable?
+        get() = focusedFlow.value
+        set(value) {
+            val previous = focusedFlow.value
+            if (previous != value) {
+                previous?.child?.isActive = false
+                value?.child?.isActive = true
+            }
+            focusedFlow.value = value
+        }
+
+    val last: Focusable
+        get() = focused?.previous ?: throw IllegalStateException("not initialized")
+
+    val child: SelectionManager?
+        get() = focused?.child
+
+    fun focusNext() {
+        focused = focused?.next
+    }
+
+    fun focusPrevious() {
+        focused = focused?.previous
+    }
+
+    fun add(): Focusable {
+        val new = Focusable(this)
+        if (focused != null) {
+            new.next = focused!!
+        } else {
+            focused = new
+        }
+        return new
+    }
+
+    fun onKeyEvent(event: KeyEvent): Boolean {
+        if (event.type != KeyEventType.KeyUp) return false
+
+        if (event.key == keyNext) {
+            if (keyPrevious == null && event.isShiftPressed) {
+                focusPrevious()
+            } else {
+                focusNext()
+            }
+        } else if (event.key == keyPrevious) {
+            focusPrevious()
+        } else {
+            return child?.onKeyEvent(event) == true
+        }
+        return true
+    }
+}
+
+class Focusable(
+    private val manager: SelectionManager,
+) {
+    val hasFocus: Flow<Boolean> =
+        combine(manager.isActiveFlow, manager.focusedFlow) { isActive, focused ->
+            isActive && focused == this
+        }
+
+    var previous: Focusable = this
+        private set
+
+    private var _next: Focusable = this
+    var next: Focusable
+        get() = _next
+        set(value) {
+            previous = value.previous
+            previous._next = this
+            value.previous = this
+            _next = value
+        }
+
+    var child: SelectionManager? = null
+        private set
+
+    fun createChild(
+        keyNext: Key,
+        keyPrevious: Key? = null
+    ): SelectionManager {
+        child = SelectionManager(keyNext, keyPrevious)
+        child!!.isActive = manager.isActive && manager.focused == this
+        return child!!
+    }
+}
+
+@Composable
+fun Modifier.focus(holder: Focusable): Modifier = if (holder.hasFocus.collectAsState(false).value) {
+    border(
+        width = 2.dp,
+        color = MaterialTheme.colorScheme.primary,
+        shape = RectangleShape
+    )
+} else {
+    this
+}

commonUI/src/commonTest/kotlin/ch/dissem/yaep/ui/common/EndOfGameTest.kt

@@ -0,0 +1,33 @@
+import androidx.compose.ui.test.ExperimentalTestApi
+import androidx.compose.ui.test.assertTextContains
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.runComposeUiTest
+import ch.dissem.yaep.ui.common.EndOfGame
+import ch.dissem.yaep.ui.common.IgnoreAndroidUnitTest
+import ch.tutteli.atrium.api.fluent.en_GB.toEqual
+import ch.tutteli.atrium.api.verbs.expect
+import kotlin.test.Test
+
+@IgnoreAndroidUnitTest
+@OptIn(ExperimentalTestApi::class)
+class EndOfGameTest {
+
+    @Test
+    fun ensure_end_of_game_works_correctly() = runComposeUiTest {
+        var restart = false
+        setContent {
+            EndOfGame(
+                isSolved = true,
+                time = "42:42",
+                onRestart = { restart = true }
+            )
+        }
+
+        onNodeWithTag("EndOfGame.solved_time").assertTextContains(value = "42:42", substring = true)
+        onNodeWithTag("EndOfGame.restart").performClick()
+
+        expect(restart).toEqual(true)
+    }
+
+}

commonUI/src/commonTest/kotlin/ch/dissem/yaep/ui/common/IgnoreAndroidUnitTest.kt

@@ -0,0 +1,5 @@
+package ch.dissem.yaep.ui.common
+
+@Suppress("EXPECT_ACTUAL_CLASSIFIERS_ARE_IN_BETA_WARNING")
+@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION)
+expect annotation class IgnoreAndroidUnitTest()

commonUI/src/jvmMain/kotlin/ch/dissem/yaep/ui/common/App.jvm.kt

@@ -0,0 +1,33 @@
+package ch.dissem.yaep.ui.common
+
+import ch.dissem.yaep.domain.Game
+import io.github.oshai.kotlinlogging.KotlinLogging
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import kotlin.coroutines.CoroutineContext
+import kotlin.io.path.Path
+import kotlin.io.path.createFile
+import kotlin.io.path.isDirectory
+import kotlin.io.path.writeText
+import kotlin.time.Clock
+import kotlin.time.ExperimentalTime
+
+private val log = KotlinLogging.logger {}
+
+@OptIn(ExperimentalTime::class)
+actual fun CoroutineScope.logGame(game: Game, dispatcher: CoroutineContext) {
+    launch(dispatcher) {
+        val dirName = """${System.getProperty("user.home")}/.yaep"""
+        val dir = Path(dirName)
+        if (dir.isDirectory()) {
+            val fileName = "$dirName/${Clock.System.now()}.yaep"
+            Path(fileName)
+                .createFile()
+                .writeText(game.toString())
+            log.info { "Saved game to $fileName" }
+        } else {
+            log.debug { "Yaep data directory does not exist or is not a directory: $dir" }
+            log.debug { "Game: $game" }
+        }
+    }
+}

commonUI/src/jvmMain/kotlin/ch/dissem/yaep/ui/common/pointer utils.jvm.kt

@@ -0,0 +1,15 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.PointerMatcher
+import androidx.compose.foundation.PointerMatcher.Companion.mouse
+import androidx.compose.foundation.onClick
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.PointerButton.Companion.Secondary
+
+@OptIn(ExperimentalFoundationApi::class)
+actual fun Modifier.onPointerAction(primary: () -> Unit, secondary: () -> Unit): Modifier {
+    return this
+        .onClick(matcher = PointerMatcher.Primary, onClick = primary)
+        .onClick(matcher = mouse(Secondary), onClick = secondary)
+}

commonUI/src/jvmTest/kotlin/ch/dissem/yaep/ui/common/IgnoreAndroidUnitTest.jvm.kt

@@ -0,0 +1,5 @@
+package ch.dissem.yaep.ui.common
+
+@Suppress("EXPECT_ACTUAL_CLASSIFIERS_ARE_IN_BETA_WARNING")
+@Target(allowedTargets = [AnnotationTarget.CLASS, AnnotationTarget.FUNCTION])
+actual annotation class IgnoreAndroidUnitTest actual constructor()

composeApp/build.gradle.kts

@@ -1,85 +0,0 @@
-import org.jetbrains.compose.desktop.application.dsl.TargetFormat
-
-plugins {
-    alias(libs.plugins.kotlinMultiplatform)
-    alias(libs.plugins.androidApplication)
-    alias(libs.plugins.jetbrainsCompose)
-}
-
-kotlin {
-    androidTarget {
-        compilations.all {
-            kotlinOptions {
-                jvmTarget = "11"
-            }
-        }
-    }
-    
-    jvm("desktop")
-    
-    sourceSets {
-        val desktopMain by getting
-        
-        androidMain.dependencies {
-            implementation(libs.compose.ui.tooling.preview)
-            implementation(libs.androidx.activity.compose)
-        }
-        commonMain.dependencies {
-            implementation(compose.runtime)
-            implementation(compose.foundation)
-            implementation(compose.material)
-            implementation(compose.ui)
-            implementation(compose.components.resources)
-            implementation(compose.components.uiToolingPreview)
-        }
-        desktopMain.dependencies {
-            implementation(compose.desktop.currentOs)
-        }
-    }
-}
-
-android {
-    namespace = "ch.dissem.yaep"
-    compileSdk = libs.versions.android.compileSdk.get().toInt()
-
-    sourceSets["main"].manifest.srcFile("src/androidMain/AndroidManifest.xml")
-    sourceSets["main"].res.srcDirs("src/androidMain/res")
-    sourceSets["main"].resources.srcDirs("src/commonMain/resources")
-
-    defaultConfig {
-        applicationId = "ch.dissem.yaep"
-        minSdk = libs.versions.android.minSdk.get().toInt()
-        targetSdk = libs.versions.android.targetSdk.get().toInt()
-        versionCode = 1
-        versionName = "1.0"
-    }
-    packaging {
-        resources {
-            excludes += "/META-INF/{AL2.0,LGPL2.1}"
-        }
-    }
-    buildTypes {
-        getByName("release") {
-            isMinifyEnabled = false
-        }
-    }
-    compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
-    }
-    dependencies {
-        debugImplementation(libs.compose.ui.tooling)
-    }
-}
-
-compose.desktop {
-    application {
-        mainClass = "MainKt"
-
-        nativeDistributions {
-            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
-            packageName = "ch.dissem.yaep"
-            packageVersion = "1.0.0"
-        }
-    }
-}

composeApp/src/androidMain/kotlin/Platform.android.kt

@@ -1,7 +0,0 @@
-import android.os.Build
-
-class AndroidPlatform : Platform {
-    override val name: String = "Android ${Build.VERSION.SDK_INT}"
-}
-
-actual fun getPlatform(): Platform = AndroidPlatform()

composeApp/src/androidMain/kotlin/ch/dissem/yaep/MainActivity.kt

@@ -1,24 +0,0 @@
-package ch.dissem.yaep
-
-import App
-import android.os.Bundle
-import androidx.activity.ComponentActivity
-import androidx.activity.compose.setContent
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.tooling.preview.Preview
-
-class MainActivity : ComponentActivity() {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-
-        setContent {
-            App()
-        }
-    }
-}
-
-@Preview
-@Composable
-fun AppAndroidPreview() {
-    App()
-}

composeApp/src/androidMain/res/drawable-v24/ic_launcher_foreground.xml

@@ -1,30 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:aapt="http://schemas.android.com/aapt"
-    android:width="108dp"
-    android:height="108dp"
-    android:viewportWidth="108"
-    android:viewportHeight="108">
-    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
-        <aapt:attr name="android:fillColor">
-            <gradient
-                android:endX="85.84757"
-                android:endY="92.4963"
-                android:startX="42.9492"
-                android:startY="49.59793"
-                android:type="linear">
-                <item
-                    android:color="#44000000"
-                    android:offset="0.0" />
-                <item
-                    android:color="#00000000"
-                    android:offset="1.0" />
-            </gradient>
-        </aapt:attr>
-    </path>
-    <path
-        android:fillColor="#FFFFFF"
-        android:fillType="nonZero"
-        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
-        android:strokeWidth="1"
-        android:strokeColor="#00000000" />
-</vector>

composeApp/src/androidMain/res/drawable/ic_launcher_background.xml

@@ -1,170 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="108dp"
-    android:height="108dp"
-    android:viewportWidth="108"
-    android:viewportHeight="108">
-    <path
-        android:fillColor="#3DDC84"
-        android:pathData="M0,0h108v108h-108z" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M9,0L9,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,0L19,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M29,0L29,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M39,0L39,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M49,0L49,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M59,0L59,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M69,0L69,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M79,0L79,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M89,0L89,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M99,0L99,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,9L108,9"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,19L108,19"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,29L108,29"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,39L108,39"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,49L108,49"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,59L108,59"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,69L108,69"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,79L108,79"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,89L108,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,99L108,99"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,29L89,29"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,39L89,39"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,49L89,49"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,59L89,59"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,69L89,69"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,79L89,79"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M29,19L29,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M39,19L39,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M49,19L49,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M59,19L59,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M69,19L69,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M79,19L79,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-</vector>

composeApp/src/androidMain/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
-</adaptive-icon>

composeApp/src/commonMain/kotlin/App.kt

@@ -1,37 +0,0 @@
-import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.foundation.Image
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.material.Button
-import androidx.compose.material.MaterialTheme
-import androidx.compose.material.Text
-import androidx.compose.runtime.*
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import org.jetbrains.compose.resources.ExperimentalResourceApi
-import org.jetbrains.compose.resources.painterResource
-import org.jetbrains.compose.ui.tooling.preview.Preview
-
-import yaep.composeapp.generated.resources.Res
-import yaep.composeapp.generated.resources.compose_multiplatform
-
-@OptIn(ExperimentalResourceApi::class)
-@Composable
-@Preview
-fun App() {
-    MaterialTheme {
-        var showContent by remember { mutableStateOf(false) }
-        Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {
-            Button(onClick = { showContent = !showContent }) {
-                Text("Click me!")
-            }
-            AnimatedVisibility(showContent) {
-                val greeting = remember { Greeting().greet() }
-                Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {
-                    Image(painterResource(Res.drawable.compose_multiplatform), null)
-                    Text("Compose: $greeting")
-                }
-            }
-        }
-    }
-}

composeApp/src/commonMain/kotlin/Greeting.kt

@@ -1,7 +0,0 @@
-class Greeting {
-    private val platform = getPlatform()
-
-    fun greet(): String {
-        return "Hello, ${platform.name}!"
-    }
-}

composeApp/src/commonMain/kotlin/Platform.kt

@@ -1,5 +0,0 @@
-interface Platform {
-    val name: String
-}
-
-expect fun getPlatform(): Platform

composeApp/src/desktopMain/kotlin/Platform.jvm.kt

@@ -1,5 +0,0 @@
-class JVMPlatform: Platform {
-    override val name: String = "Java ${System.getProperty("java.version")}"
-}
-
-actual fun getPlatform(): Platform = JVMPlatform()

composeApp/src/desktopMain/kotlin/main.kt

@@ -1,11 +0,0 @@
-import androidx.compose.ui.window.Window
-import androidx.compose.ui.window.application
-
-fun main() = application {
-    Window(
-        onCloseRequest = ::exitApplication,
-        title = "YAEP",
-    ) {
-        App()
-    }
-}

desktop/build.gradle.kts

@@ -0,0 +1,52 @@
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+
+plugins {
+    alias(libs.plugins.kotlin.kover)
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.compose.compiler)
+    alias(libs.plugins.compose)
+}
+
+kotlin {
+    jvmToolchain(libs.versions.jdk.get().toInt())
+
+    dependencies {
+        implementation(compose.desktop.currentOs)
+        implementation(compose.material3)
+        implementation(compose.components.resources)
+        implementation(projects.commonUI)
+        implementation(compose.components.uiToolingPreview)
+
+        testImplementation(libs.kotlin.test)
+        testImplementation(libs.atrium)
+        testImplementation(compose.desktop.uiTestJUnit4)
+        testImplementation(compose.desktop.currentOs)
+    }
+}
+
+compose.desktop {
+    application {
+        mainClass = "ch.dissem.yaep.ui.desktop.MainKt"
+
+        nativeDistributions {
+            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            packageName = "YAEP"
+            packageVersion = libs.versions.app.version.name.get()
+            macOS {
+                iconFile.set(project.file("icon.icns"))
+            }
+            windows {
+                iconFile.set(project.file("icon.ico"))
+            }
+            linux {
+                iconFile.set(project.file("icon.png"))
+            }
+
+            buildTypes.release.proguard {
+                configurationFiles.from(project.file("proguard-rules.pro"))
+                isEnabled.set(false)
+                obfuscate.set(false)
+            }
+        }
+    }
+}

desktop/proguard-rules.pro

@@ -0,0 +1,25 @@
+-libraryjars  <java.home>/jmods/java.base.jmod(!**.jar;!module-info.class)
+
+-keepclasseswithmembers public class MainKt {
+    public static void main(java.lang.String[]);
+}
+
+-dontwarn kotlinx.coroutines.debug.*
+-dontwarn kotlinx.datetime.**
+
+-keep class kotlin.** { *; }
+-keep class kotlinx.coroutines.** { *; }
+-keep class org.jetbrains.skia.** { *; }
+-keep class org.jetbrains.skiko.** { *; }
+
+-ignorewarnings
+
+# Windows folders
+-keep class com.sun.jna.* { *; }
+-keepclassmembers class * extends com.sun.jna.* { public *; }
+
+-assumenosideeffects public class androidx.compose.runtime.ComposerKt {
+    void sourceInformation(androidx.compose.runtime.Composer,java.lang.String);
+    void sourceInformationMarkerStart(androidx.compose.runtime.Composer,int,java.lang.String);
+    void sourceInformationMarkerEnd(androidx.compose.runtime.Composer);
+}

desktop/src/main/composeResources/drawable/ic_launcher.svg

@@ -0,0 +1,157 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generator: Adobe Illustrator 24.1.2, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+
+<svg
+   version="1.1"
+   id="Layer_2"
+   x="0px"
+   y="0px"
+   viewBox="0 0 32 32"
+   xml:space="preserve"
+   sodipodi:docname="ic_launcher.svg"
+   inkscape:version="1.4 (e7c3feb100, 2024-10-09)"
+   width="32"
+   height="32"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+   id="defs16"><filter
+     style="color-interpolation-filters:sRGB"
+     inkscape:label="Drop Shadow"
+     id="filter31"
+     x="-0.032370995"
+     y="-0.033195397"
+     width="1.0773869"
+     height="1.0793577"><feFlood
+       result="flood"
+       in="SourceGraphic"
+       flood-opacity="0.498039"
+       flood-color="rgb(0,0,0)"
+       id="feFlood30" /><feGaussianBlur
+       result="blur"
+       in="SourceGraphic"
+       stdDeviation="1.600000"
+       id="feGaussianBlur30" /><feOffset
+       result="offset"
+       in="blur"
+       dx="1.500000"
+       dy="1.500000"
+       id="feOffset30" /><feComposite
+       result="comp1"
+       operator="in"
+       in="flood"
+       in2="offset"
+       id="feComposite30" /><feComposite
+       result="comp2"
+       operator="over"
+       in="SourceGraphic"
+       in2="comp1"
+       id="feComposite31" /></filter></defs><sodipodi:namedview
+   id="namedview16"
+   pagecolor="#ffffff"
+   bordercolor="#000000"
+   borderopacity="0.25"
+   inkscape:showpageshadow="2"
+   inkscape:pageopacity="0.0"
+   inkscape:pagecheckerboard="0"
+   inkscape:deskcolor="#d1d1d1"
+   inkscape:zoom="5.0602329"
+   inkscape:cx="18.47741"
+   inkscape:cy="88.632284"
+   inkscape:window-width="2514"
+   inkscape:window-height="1376"
+   inkscape:window-x="0"
+   inkscape:window-y="0"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="Layer_2" />
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+<g
+   id="g1"
+   transform="scale(0.25)"><rect
+     style="fill:#64bb8b;fill-opacity:1;stroke:none;stroke-width:1.06961;stroke-linecap:round;stroke-linejoin:round"
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+     width="128"
+     height="128"
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+     id="g16"
+     transform="matrix(0.86689217,0,0,0.86689217,8.5348442,8.6056136)"
+     style="filter:url(#filter31)"><path
+       style="fill:#464c4f"
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+</svg>

desktop/src/main/kotlin/ch/dissem/yaep/ui/desktop/desktop window.kt

@@ -0,0 +1,151 @@
+package ch.dissem.yaep.ui.desktop
+
+import SelectionManager
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.window.WindowDraggableArea
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Switch
+import androidx.compose.material3.SwitchDefaults
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.scale
+import androidx.compose.ui.input.key.onKeyEvent
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.WindowPlacement
+import androidx.compose.ui.window.WindowScope
+import androidx.compose.ui.window.WindowState
+import ch.dissem.yaep.ui.common.theme.AppTheme
+import org.jetbrains.compose.resources.painterResource
+import org.jetbrains.compose.resources.stringResource
+import yaep.commonui.generated.resources.action_restart
+import yaep.commonui.generated.resources.app_name_full
+import yaep.commonui.generated.resources.moon
+import yaep.commonui.generated.resources.restart
+import yaep.commonui.generated.resources.sun
+import yaep.commonui.generated.resources.use_dark_mode
+import yaep.commonui.generated.resources.use_light_mode
+import yaep.commonui.generated.resources.window_close
+import yaep.commonui.generated.resources.window_maximize
+import yaep.commonui.generated.resources.window_minimize
+import yaep.desktop.generated.resources.ic_launcher
+import yaep.commonui.generated.resources.Res as CRes
+import yaep.desktop.generated.resources.Res as DRes
+
+@Composable
+fun WindowScope.DesktopWindow(
+    useDarkMode: Boolean,
+    selectionManager: SelectionManager,
+    topBar: @Composable () -> Unit,
+    content: @Composable (PaddingValues) -> Unit
+) {
+    AppTheme(darkTheme = useDarkMode) {
+        Scaffold(
+            modifier = Modifier.onKeyEvent { event -> selectionManager.onKeyEvent(event) },
+            topBar = {
+                WindowDraggableArea {
+                    topBar()
+                }
+            }
+        ) { paddingValues ->
+            content(paddingValues)
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AppBar(
+    useDarkMode: Boolean,
+    setDarkMode: (Boolean) -> Unit,
+    onCloseRequest: () -> Unit,
+    onRestart: () -> Unit,
+    windowState: WindowState,
+) {
+    TopAppBar(
+        navigationIcon = {
+            IconButton(onClick = { /* do nothing */ }) {
+                Image(
+                    painter = painterResource(DRes.drawable.ic_launcher),
+                    contentDescription = null
+                )
+            }
+        },
+        title = { Text(text = stringResource(CRes.string.app_name_full)) },
+        actions = {
+            IconButton(
+                onClick = onRestart
+            ) {
+                Icon(
+                    painter = painterResource(CRes.drawable.action_restart),
+                    contentDescription = stringResource(CRes.string.restart),
+                    modifier = Modifier.size(SwitchDefaults.IconSize),
+                )
+            }
+            Spacer(Modifier.width(8.dp))
+            Switch(
+                checked = useDarkMode,
+                onCheckedChange = setDarkMode,
+                thumbContent = {
+                    Icon(
+                        painter = painterResource(
+                            if (useDarkMode) {
+                                CRes.drawable.moon
+                            } else {
+                                CRes.drawable.sun
+                            }
+                        ),
+                        contentDescription = stringResource(
+                            if (useDarkMode) {
+                                CRes.string.use_dark_mode
+                            } else {
+                                CRes.string.use_light_mode
+                            }
+                        ),
+                        modifier = Modifier.size(SwitchDefaults.IconSize),
+                    )
+                }
+            )
+            Spacer(Modifier.width(8.dp))
+            IconButton(
+                onClick = { windowState.isMinimized = !windowState.isMinimized }
+            ) {
+                Icon(
+                    painter = painterResource(CRes.drawable.window_minimize),
+                    contentDescription = stringResource(CRes.string.window_minimize),
+                    modifier = Modifier.size(SwitchDefaults.IconSize),
+                )
+            }
+            IconButton(
+                onClick = {
+                    windowState.placement =
+                        if (windowState.placement == WindowPlacement.Maximized)
+                            WindowPlacement.Floating else WindowPlacement.Maximized
+                }
+            ) {
+                Icon(
+                    painter = painterResource(CRes.drawable.window_maximize),
+                    contentDescription = stringResource(CRes.string.window_maximize),
+                    modifier = Modifier.size(SwitchDefaults.IconSize),
+                )
+            }
+            IconButton(
+                onClick = onCloseRequest
+            ) {
+                Icon(
+                    painter = painterResource(CRes.drawable.window_close),
+                    contentDescription = stringResource(CRes.string.window_close),
+                    modifier = Modifier.size(SwitchDefaults.IconSize),
+                )
+            }
+        },
+    )
+}

desktop/src/main/kotlin/ch/dissem/yaep/ui/desktop/main.kt

@@ -0,0 +1,83 @@
+package ch.dissem.yaep.ui.desktop
+
+import SelectionManager
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.platform.Font
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.WindowPlacement
+import androidx.compose.ui.window.application
+import androidx.compose.ui.window.rememberWindowState
+import ch.dissem.yaep.domain.generateGame
+import ch.dissem.yaep.ui.common.App
+import ch.dissem.yaep.ui.common.theme.emojiFontFamily
+import org.jetbrains.compose.resources.painterResource
+import org.jetbrains.compose.resources.stringResource
+import yaep.commonui.generated.resources.app_name
+import yaep.desktop.generated.resources.ic_launcher
+import yaep.commonui.generated.resources.Res as CRes
+import yaep.desktop.generated.resources.Res as DRes
+
+fun main(): Unit = application {
+    emojiFontFamily = FontFamily(
+        Font(
+            resource = "NotoColorEmoji-Regular.ttf",
+            weight = FontWeight.W400,
+            style = FontStyle.Normal
+        )
+    )
+    val windowState = rememberWindowState(
+        placement = WindowPlacement.Floating,
+        size = DpSize(1250.dp, 800.dp)
+    )
+    var game by remember { mutableStateOf(generateGame()) }
+
+    Window(
+        onCloseRequest = ::exitApplication,
+        undecorated = true,
+        title = stringResource(CRes.string.app_name),
+        state = windowState,
+        icon = painterResource(DRes.drawable.ic_launcher)
+    ) {
+        val selectionManager = remember { SelectionManager(Key.Tab).apply { isActive = true } }
+        var useDarkMode by remember { mutableStateOf(true) }
+        var resetCluesBeacon by remember { mutableStateOf(Any()) }
+        DesktopWindow(
+            useDarkMode = useDarkMode,
+            selectionManager = selectionManager,
+            topBar = {
+                AppBar(
+                    useDarkMode = useDarkMode,
+                    setDarkMode = { useDarkMode = it },
+                    onCloseRequest = ::exitApplication,
+                    onRestart = {
+                        @Suppress("ControlFlowWithEmptyBody")
+                        do /* nothing */ while (game.grid.undo())
+                        resetCluesBeacon = Any()
+                    },
+                    windowState = windowState,
+                )
+            }
+        ) {
+            App(
+                modifier = Modifier.padding(it),
+                selectionManager = selectionManager,
+                spacing = 8.dp,
+                selectDirectly = true,
+                game = game,
+                onNewGame = { game = generateGame() },
+                resetCluesBeacon = resetCluesBeacon
+            )
+        }
+    }
+}

docs/icons/yaep-icon-square.svg

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="48" height="48" version="1.1" viewBox="0 0 48 48" xml:space="preserve" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <filter id="filter31" x="-.03237" y="-.0332" width="1.077" height="1.079" color-interpolation-filters="sRGB">
+            <feFlood flood-color="rgb(0,0,0)" flood-opacity=".498" in="SourceGraphic" result="flood"/>
+            <feGaussianBlur in="SourceGraphic" result="blur" stdDeviation="1.600000"/>
+            <feOffset dx="1.500000" dy="1.500000" in="blur" result="offset"/>
+            <feComposite in="flood" in2="offset" operator="in" result="comp1"/>
+            <feComposite in="SourceGraphic" in2="comp1" result="comp2"/>
+        </filter>
+    </defs>
+    <rect x=".0004669" width="48" height="48" ry="0" fill="#64bb8b" stroke-width=".375"/><g transform="matrix(1.732 0 0 1.732 -4.058 -4.317)"><g transform="matrix(.2167 0 0 .2167 2.134 2.151)" filter="url(#filter31)">
+            <path d="m48.37 30.91s-11.64-10.14-12.76-11.26c-1.13-1.13-3.94-3.19-3.38-4.69s9.971-5.159 16.52-6.57c61.25-13.19 87.04 66.99 69.07 103.2z" fill="#464c4f"/>
+            <path d="m122.8 94.29c-0.5595 4.738-1.756 9.477-3.588 14.22l-60.44-79.85-12.88-19.56c4.272-1.136 8.53-1.823 12.77-2.06l6.657 26.2 8.494-24.95c3.945 0.9298 7.612 2.24 11 3.931l-12.95 27.01 4.08 1.48 17.2-23.38c2.031 1.525 3.874 3.085 5.53 4.68l-17.1 22.64 5.63 4.15 17.61-20.03c2.189 2.771 4.174 5.674 5.953 8.709l-17.15 15.97 3.38 5.56 18.56-12.08c0.8559 1.981 1.623 3.93 2.302 5.847l-18.55 10.95 4.65 5.21 16.18-8.818c0.5694 2.125 1.065 4.261 1.488 6.408l-17.46 8.82 2.96 6.69 15.9-5.81c0.193 2.146 0.3103 4.149 0.352 6.009l-13.65 5.012 3.24 8.09z" fill="#dfdfe0"/>
+            <path d="m56.53 27.11c-9.516 0.6828-16.74 5.918-36.32 31.67 3.278 11.31 6.066 22.03 13.09 31.4 14.76 1.845 25.78-4.514 29.98-7.46-1.57 13.01-3.422 25.25-4.98 38.29-0.3775 3.16 58.74 1 60.58-0.84 4.007-4.007-2.527-67.62-40.1-85.32 0.7087-19.88-8.565-27.38-9.16-27.45-0.0978-0.01053-9.538 2.494-13.09 19.71z" fill="#2f2f2f"/>
+            <g fill="#fff">
+                <path d="m22.53 58.86 10.49-13.09c1.82 2.611-1.21 6.546-7.11 13.86z"/>
+                <path d="m28.47 78.02c16.34-15.16 24.96-8.079 23.51 6.76-2.066 1.049-3.371 1.31-5.45 1.67 1.594-13.42-5.84-12.49-16.75-5.89z"/>
+                <path d="m32.69 85.39c2.974-3.546 7.702-3.297 8.03 1.97-3.067 0.1987-4.479 0.1548-8.68 0z"/>
+                <path d="m29.97 69.81s8.49-10.46 21.02-6.01 7.27 17.55 7.27 17.55l3.43-1.6c3.135-14.52-6.072-15.23-4.5-23.22 0.9881-3.903 1.347-10.12 5.957-11.45 3.973 0.1429 0.08547 6.597 0.7128 12.11 0.9848 8.655 7.527 7.781 3.8 29.32 12.49-6.333 23.42-14.89 33.78-24.22-0.5165-1.271-1.566-2.996-2.49-4.03-19.02 13.86-26.9 18.24-27.36 17.7-0.6832-0.805 7.523-23.24 12.01-34.26-1.74-1.554-2.447-1.879-5.58-3.05-1.498 2.874-3.624 12.45-8.11 11.55-1.88-1.36-1.83-7.65 1.41-11.97 1.73-2.31 3.8-3.05 4.08-9.43 0.4061-9.253-4.874-17.14-5.92-17.08-6.44 4.087-8.193 11.18-9.15 18.21l-2.02 0.75s-0.96 10.46-3.26 12.2-6.05 1.2-6.45-1.78c-0.52-3.91-0.33-7.93-0.33-7.93-3.254 1.182-4.495 3.709-5.2 6.94-0.6171 6.754-10.17 11.48-11.99 22.8z"/>
+                <path d="m89.76 47.43s-5.33 11.83-5.16 12.44 10.23-7.46 10.23-7.46c-3.009-3.735-4.308-4.572-5.07-4.98z"/>
+            </g>
+            <path d="m54.23 53.58c0 2.8-1.08 5.58-4.22 5.3-2.34-0.21-4.27-2.5-4.27-5.3s1.9-5.07 4.25-5.07 4.24 2.27 4.24 5.07z" fill="#0b0b0b"/>
+            <g fill="#fff">
+                <path d="m63.71 101.5-0.84 7.67c28.97-11.09 43.7-32.11 44.98-34-0.5754-2.122-1.508-4.063-2.82-6.13-20.85 22.14-22.95 23.97-41.32 32.46z"/>
+                <path d="m66.88 118.9c4.883-4.883 10.68 3.176 44.13-36.04 0.4748 2.343 1.097 3.836 1.47 5.78-8.404 12.68-15.72 22.85-30.84 30.62-4.826 0.2567-9.638 0.0546-14.76-0.36z"/>
+                <path d="m114.5 99.82c-5.164 9.147-5.757 10.87-11.12 18.16 4.868-0.1117 9.091-0.4384 12.67-0.98 0.343-5.512-0.1736-11.24-1.55-17.18z"/>
+            </g>
+            <path d="m68.64 18.45c-2.435-0.2632-8.507 16.82-1.34 16.82 6.086 0 3.386-16.59 1.34-16.82z" fill="#454c50"/>
+            <path d="m29.88 60c-2.89-2.64-7.41-3.57-9.67-1.22-2.25 2.35-3.57 5.35-5.44 7.32-7.025 6.534-13.12 15.92-8.17 25.53 3 4.97 9.1 8.26 16.61 5.63s10.51-6.48 10.79-9.29c1.036-10.4-6.915-9.81-5.44-13.33 0.75-1.79 6.76-9.66 1.32-14.64z" fill="#464c4f"/>
+            <path d="m11.11 79.71c-0.1 1.56 1.92 1.27 2.63 2.72 0.7 1.45-0.94 4.27 0.89 4.6s4.18-3.28 3.05-6.71c-1.13-3.42-6.43-2.86-6.57-0.61z" fill="#303030"/>
+            <path d="m14.23 97.64s5-2.44 7.25-4.55c2.19-2.06 4.32-4.55 4.83-5.35 0.52-0.8 1.6-2.25 2.53-1.6 0.94 0.66 0.52 1.83-0.09 2.72s-2.16 3.1-4.6 5.35c-2.11 1.95-3.14 2.44-4.69 3.28-1.13 0.61-2.21 0.7-2.21 0.7s-0.88 0.01-1.79-0.14c-0.35-0.05-1.23-0.41-1.23-0.41z" fill="#303030"/>
+        </g></g>
+</svg>

domain/build.gradle.kts

@@ -0,0 +1,45 @@
+plugins {
+    alias(libs.plugins.kotlin.kover)
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.android.library)
+}
+
+kotlin {
+    jvmToolchain(libs.versions.jdk.get().toInt())
+
+    jvm()
+    androidTarget()
+
+    sourceSets {
+        commonMain.dependencies {
+            implementation(libs.bundles.logging)
+        }
+
+        commonTest.dependencies {
+            implementation(libs.kotlin.test)
+            implementation(libs.atrium)
+        }
+    }
+}
+
+android {
+    namespace = "ch.dissem.yaep.domain"
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
+
+    defaultConfig {
+        minSdk = libs.versions.android.minSdk.get().toInt()
+    }
+
+    sourceSets {
+        getByName("test") {
+            resources.srcDirs("src/commonTest/resources")
+        }
+    }
+
+    buildTypes {
+        debug {
+            enableAndroidTestCoverage = true
+            enableUnitTestCoverage = true
+        }
+    }
+}

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/Game.kt

@@ -0,0 +1,131 @@
+package ch.dissem.yaep.domain
+
+import io.github.oshai.kotlinlogging.KotlinLogging
+
+class Game(
+    val grid: Grid,
+    val clues: Collection<Clue>
+) {
+    private val log = KotlinLogging.logger { }
+    val horizontalClues: List<HorizontalClue> = clues.filterIsInstance<HorizontalClue>()
+    val verticalClues: List<SameColumnClue<ItemClass<*>, ItemClass<*>>> =
+        clues.filterIsInstance<SameColumnClue<ItemClass<*>, ItemClass<*>>>()
+
+    private val onStartListeners = mutableListOf<() -> Unit>()
+    private val onSolvedListeners = mutableListOf<() -> Unit>()
+
+    /**
+     * Make sure that no category is used more than once.
+     */
+    val areCategoriesValid: Boolean
+        get() = grid.rows.map { it.category }.distinct().size == grid.rows.size
+
+    val isValid: Boolean
+        get() = areCategoriesValid && clues.all { it.isValid(grid) }
+
+    val isSolved: Boolean
+        get() = grid.rows.all { it.isSolved } && isValid
+
+
+    init {
+        for (position in clues.filterIsInstance<PositionClue<ItemClass<*>>>()) {
+            val row = grid[position.item.itemType.companion]
+            row.forEachIndexed { index, gameCell ->
+                if (index == position.index) {
+                    gameCell.selection = position.item
+                    gameCell.mutable = false
+                } else {
+                    gameCell.options.remove(position.item)
+                }
+            }
+        }
+        grid.forEach { row ->
+            row.forEach { cell ->
+                cell.optionsChangedListeners.add {
+                    if (onStartListeners.isNotEmpty()) {
+                        onStartListeners.forEach { it() }
+                        onStartListeners.clear()
+                    }
+                }
+            }
+            row.onSolved {
+                log.debug { "Is game valid: $isValid" }
+                log.debug { "Is game solved: $isSolved" }
+                if (onSolvedListeners.isNotEmpty() && isSolved) {
+                    log.debug { "Game solved, notifying listeners" }
+                    onSolvedListeners.forEach { it() }
+                }
+            }
+        }
+        grid.snapshot()
+    }
+
+    fun onStart(listener: () -> Unit) {
+        onStartListeners.add(listener)
+    }
+
+    fun onSolved(listener: () -> Unit) {
+        onSolvedListeners.add(listener)
+    }
+
+    override fun toString(): String {
+        return grid.toString() + "\n\n" + clues.joinToString("\n* ", prefix = "* ")
+    }
+
+    companion object {
+        fun parse(description: String): Game {
+            val optionsRegex = Regex("[A-Z]+(?:_[A-Z]+)*")
+            val options = optionsRegex.findAll(description)
+                .map { it.value }
+                .distinct()
+                .map { Item(ItemClass.parse(it)) }
+                .groupBy { it.itemType.companion }
+                .toMutableMap()
+            val size = options.size
+            // Fill up missing items (one item per row might not appear in the clues)
+            // (This could be improved by looking which items are in the grid part, but this will
+            // not always work.)
+            options
+                .filter { it.value.size < size }
+                .forEach { entry ->
+                    val missing = size - entry.value.size
+                    val used = entry.value.map { it.itemType }.toSet()
+                    val fillers = entry.key.items
+                        .filter { !used.contains(it) }
+                        .take(missing)
+                        .map { Item(it) }
+                    options[entry.key] = entry.value + fillers
+                }
+            val optionMap = options.values.flatten().associateBy(
+                keySelector = { it.itemType },
+                valueTransform = { it }
+            )
+            val clues: Collection<Clue> = description.lines()
+                .filter { it.startsWith("* ") }
+                .map { line ->
+                    Clue.parse(line) {
+                        optionMap[it] ?: throw IllegalArgumentException("Unknown option $it")
+                    }
+                }
+
+            return Game(
+                grid = Grid(
+                    rows = options.values
+                        .map { createRow<ItemClass<*>>(it.sorted()) }
+                        .toList()
+                ),
+                clues = clues
+            )
+        }
+
+        private fun <C : ItemClass<C>> createRow(options: List<Item<*>>): GameRow<*> {
+            @Suppress("UNCHECKED_CAST")
+            options as List<Item<C>>
+            return GameRow(
+                category = options.first().itemType.companion,
+                options = options,
+                cells = options.map { GameCell(options = options.toMutableList()) }
+            )
+        }
+    }
+}

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/GameCell.kt

@@ -0,0 +1,49 @@
+package ch.dissem.yaep.domain
+
+class GameCell<C : ItemClass<C>>(
+    selection: Item<C>? = null,
+    val solution: Item<C>? = null,
+    options: Collection<Item<C>>,
+    /*** If mutable is false, the cell will silently ignore all changes to 'selection'. */
+    var mutable: Boolean = true
+) {
+    val selectionChangedListeners: MutableList<(Item<C>?) -> Unit> =
+        mutableListOf<(Item<C>?) -> Unit>()
+    val optionsChangedListeners: MutableList<(Collection<Item<C>>) -> Unit> =
+        mutableListOf<(Collection<Item<C>>) -> Unit>()
+
+    var selection: Item<C>? = selection
+        set(value) {
+            if (mutable) {
+                field = value
+                selectionChangedListeners.forEach { listener -> listener(value) }
+            }
+        }
+    val options: ObservableSet<Item<C>> = ObservableSet(options) { _, after ->
+        optionsChangedListeners.forEach { listener ->
+            listener(after)
+        }
+    }
+
+    private val snapshots = ArrayDeque<Pair<Item<C>?, Collection<Item<C>>>>()
+
+    fun snapshot() {
+        snapshots.addLast(selection to options.toSet())
+    }
+
+    fun undo(): Boolean {
+        val (selection, options) = snapshots.removeLastOrNull() ?: return false
+        this.selection = selection
+        this.options.clear()
+        this.options.addAll(options)
+        return true
+    }
+}
+
+fun <C : ItemClass<C>> GameCell<C>?.mayBe(item: Item<C>, mayHaveSelection: Boolean = true): Boolean =
+    this != null &&
+            ((mayHaveSelection && selection == item) || (selection == null && options.contains(item)))
+
+fun <C : ItemClass<C>> GameCell<C>?.hasNoSelection(): Boolean =
+    this != null && this.selection == null
+

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/GameRow.kt

@@ -0,0 +1,84 @@
+package ch.dissem.yaep.domain
+
+@Suppress("JavaDefaultMethodsNotOverriddenByDelegation")
+class GameRow<C : ItemClass<C>>(
+    val category: ItemClassCompanion<C>,
+    val options: List<Item<C>>,
+    val cells: List<GameCell<C>>
+) : List<GameCell<C>> by cells {
+    var isSolved: Boolean = false
+        private set(value) {
+            field = value
+            if (value) {
+                onSolvedListener()
+            }
+        }
+    var onSolvedListener: () -> Unit = {}
+
+    fun onSolved(listener: () -> Unit) {
+        onSolvedListener = listener
+    }
+
+    fun indexOf(element: C): Int = indexOfFirst { it.selection?.itemType == element }
+
+    fun cleanupOptions() {
+        if (isSolved && all {
+                it.solution != null
+                        && it.options.size == 1
+                        && it.options.single() == it.selection
+            }
+        ) return
+        do {
+            var changed = false
+            val selections = filter { it.selection != null }.let { cellsWithSelection ->
+                cellsWithSelection
+                    .filter { it.options.size != 1 }
+                    .forEach {
+                        it.options.clear()
+                        it.options.add(it.selection!!)
+                    }
+                cellsWithSelection.mapNotNull { it.selection }.toSet()
+            }
+            filter { it.selection == null }
+                .forEach { it.options.removeAll(selections) }
+            filter { it.selection == null && it.options.size == 1 }
+                .forEach {
+                    changed = true
+                    it.selection = it.options.single()
+                }
+            if (!changed) {
+                filter { it.selection == null }
+                    .flatMap { c -> c.options.map { o -> o to c } }
+                    .groupBy { it.first }
+                    .filter { it.value.size == 1 }
+                    .forEach {
+                        val c = it.value.single().second
+                        c.selection = it.key
+                        changed = true
+                    }
+            }
+        } while (changed)
+        isSolved = all {
+            it.solution != null
+                    && it.options.size == 1
+                    && it.options.single() == it.selection
+        }
+    }
+
+    fun snapshot() {
+        cells.forEach { it.snapshot() }
+    }
+
+    fun undo(): Boolean {
+        val didChange = cells.map { it.undo() }.reduce { a, b -> a || b }
+        if (didChange) {
+            isSolved = all {
+                it.solution != null
+                        && it.options.size == 1
+                        && it.options.single() == it.selection
+            }
+        }
+        return didChange
+    }
+
+}

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/Grid.kt

@@ -0,0 +1,58 @@
+package ch.dissem.yaep.domain
+
+@Suppress("UNCHECKED_CAST", "JavaDefaultMethodsNotOverriddenByDelegation")
+class Grid(
+    val rows: List<GameRow<*>>
+) : List<GameRow<ItemClass<*>>> by rows as List<GameRow<ItemClass<*>>> {
+
+    val cells: List<GameCell<*>>
+        get() = rows.flatten()
+
+    fun <C : ItemClass<C>> indexOf(element: C): Int {
+        return this[element.companion]
+            .indexOfFirst { it.selection?.itemType == element }
+    }
+
+    operator fun <C : ItemClass<C>> get(itemType: ItemClassCompanion<C>): GameRow<C> {
+        @Suppress("UNCHECKED_CAST")
+        return rows.first { it.category == itemType } as GameRow<C>
+    }
+
+    operator fun <C : ItemClass<C>> get(item: Item<C>): GameCell<C> {
+        return this[item.itemType.companion].first { it.selection == item }
+    }
+
+    override fun toString(): String {
+        return joinToString("\n") { row ->
+            row.joinToString("") { it.selection?.symbol ?: "⬛" }
+        }
+    }
+
+    fun cleanupOptions() {
+        forEach { row -> row.cleanupOptions() }
+    }
+
+    fun snapshot() {
+        forEach { row -> row.snapshot() }
+    }
+
+    fun undo(): Boolean {
+        return map { row -> row.undo() }.reduce { a, b -> a || b }
+    }
+}
+
+fun List<List<Item<ItemClass<*>>>>.toGrid(): Grid = Grid(
+    map { row ->
+        GameRow(
+            category = row.first().itemType.companion,
+            options = row.sorted(),
+            cells = row.map {
+                GameCell(
+                    selection = null,
+                    solution = it,
+                    options = row.toMutableList()
+                )
+            }
+        )
+    }
+)

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/Item.kt

@@ -0,0 +1,25 @@
+package ch.dissem.yaep.domain
+
+
+class Item<C : ItemClass<C>>(
+    val itemType: C,
+    val symbol: String = itemType.symbols.random()
+) : Comparable<Item<C>> {
+    constructor(itemType: C) : this(itemType, itemType.symbols.random())
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is Item<*>) return false
+        return itemType == other.itemType
+    }
+
+    override fun hashCode(): Int {
+        return itemType.hashCode()
+    }
+
+    override fun toString(): String {
+        return itemType.toString() + symbol
+    }
+
+    override fun compareTo(other: Item<C>): Int = itemType.compareTo(other.itemType)
+}