Reduce cyclomatic complexity

- restart has now focus after
  solving puzzle
- removed options can be added again
- removing a selection by keypress
  makes a rollback as well

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

@@ -20,6 +20,7 @@ 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 ch.dissem.yaep.ui.common.focus.FocusFollowingSelectionManager
 import org.jetbrains.compose.resources.painterResource
 import org.jetbrains.compose.resources.stringResource
 import yaep.commonui.generated.resources.action_restart
@@ -63,8 +64,8 @@ class MainActivity : ComponentActivity() {
             ) { insets ->
                 App(
                     modifier = Modifier.padding(insets),
+                    rootSelectionManager = FocusFollowingSelectionManager,
                     spacing = 4.dp,
-                    selectDirectly = false,
                     game = game,
                     onNewGame = { game = generateGame() },
                     resetCluesBeacon = resetCluesBeacon
@@ -83,7 +84,7 @@ fun AppAndroidPreview() {
     App(
         game = game,
         spacing = 4.dp,
-        selectDirectly = false,
+        rootSelectionManager = FocusFollowingSelectionManager,
         onNewGame = { game = generateGame() },
         resetCluesBeacon = resetCluesBeacon
     )

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

@@ -15,17 +15,20 @@ 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 ch.dissem.yaep.ui.common.focus.FocusFollowingFocusable
+import ch.dissem.yaep.ui.common.focus.SelectionManager
+import ch.dissem.yaep.ui.common.layout.AdaptiveGameLayout
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.IO
 import kotlin.coroutines.CoroutineContext
 import kotlin.time.ExperimentalTime
 
-
 @Composable
 @OptIn(ExperimentalTime::class)
 fun App(
     modifier: Modifier = Modifier,
-    selectDirectly: Boolean,
+    rootSelectionManager: SelectionManager<FocusFollowingFocusable>,
     spacing: Dp,
     game: Game,
     onNewGame: () -> Unit,
@@ -54,45 +57,71 @@ fun App(
     Box(modifier = modifier) {
         AdaptiveGameLayout(
             modifier = Modifier.blurOnFinished(isSolved),
-            grid = {
+            selectionManager = rootSelectionManager,
+            grid = { selectionManager ->
                 PuzzleGrid(
+                    selectionManager = selectionManager,
                     grid = game.grid,
                     spacing = spacing,
-                    selectDirectly = selectDirectly,
                     onUpdate = {
                         horizontalClues.forEach { it.update(game.grid) }
                         verticalClues.forEach { it.update(game.grid) }
                     }
                 )
             },
-            horizontalClues = {
+            horizontalClues = { selectionManager ->
                 for (clue in horizontalClues) {
                     HorizontalClue(
-                        modifier = Modifier.forClue(clue, spacing),
+                        modifier = Modifier
+                            .focus(remember(selectionManager) {
+                                selectionManager.add(
+                                    primaryAction = {
+                                        clue.isActive = !clue.isActive
+                                    },
+                                    secondaryAction = {
+                                        clue.isActive = false
+                                    }
+                                )
+                            })
+                            .forClue(clue, spacing),
                         spacing = spacing,
                         clue = clue.clue,
                         isClueViolated = clue.isViolated
                     )
                 }
             },
-            verticalClues = {
+            verticalClues = { selectionManager ->
+                if (verticalClues.isNotEmpty()) {
                     for (clue in verticalClues) {
                         VerticalClue(
-                        modifier = Modifier.forClue(clue, spacing),
+                            modifier = Modifier
+                                .focus(remember(selectionManager) {
+                                    selectionManager.add(
+                                        primaryAction = {
+                                            clue.isActive = !clue.isActive
+                                        },
+                                        secondaryAction = {
+                                            clue.isActive = false
+                                        }
+                                    )
+                                })
+                                .forClue(clue, spacing),
                             spacing = spacing,
                             clue = clue.clue,
                             isClueViolated = clue.isViolated
                         )
                     }
+                }
             },
             time = {
                 Text(
                     time,
-                    fontSize = TextUnit(4f, TextUnitType.Companion.Em),
+                    fontSize = TextUnit(4f, TextUnitType.Em),
                     textAlign = TextAlign.End
                 )
             },
-            spacing = spacing
+            spacing = spacing,
+            game, resetCluesBeacon
         )
         EndOfGame(isSolved = isSolved, time = time, onRestart = onNewGame)
     }

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

@@ -1,338 +0,0 @@
-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/end.kt

@@ -13,10 +13,14 @@ import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.remember
 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.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.BlurEffect
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.platform.testTag
@@ -36,6 +40,12 @@ fun EndOfGame(
     time: String,
     onRestart: () -> Unit
 ) {
+    val focusRequester = remember { FocusRequester() }
+    LaunchedEffect(isSolved) {
+        if (isSolved) {
+            focusRequester.requestFocus()
+        }
+    }
     AnimatedVisibility(
         visible = isSolved,
         modifier = modifier,
@@ -72,6 +82,7 @@ fun EndOfGame(
                 Spacer(modifier = Modifier.height(32.dp))
                 Button(
                     modifier = Modifier.align(CenterHorizontally)
+                        .focusRequester(focusRequester)
                         .testTag("EndOfGame.restart"),
                     onClick = onRestart
                 ) {

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

@@ -0,0 +1,7 @@
+package ch.dissem.yaep.ui.common.focus
+
+class CluesFocusable(
+    manager: CluesSelectionManager,
+    primaryAction: (() -> Unit)?,
+    secondaryAction: (() -> Unit)?
+) : Focusable<CluesFocusable>(manager, primaryAction, secondaryAction)

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

@@ -0,0 +1,72 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEvent
+import androidx.compose.ui.input.key.key
+import ch.dissem.yaep.ui.common.ceilDiv
+import kotlin.math.max
+import kotlin.math.min
+
+class CluesSelectionManager : SelectionManager<CluesFocusable>() {
+    var columns: Int = 1
+
+    private var row: Int = 0
+    private var col: Int = 0
+
+    private val focusables = mutableListOf<CluesFocusable>()
+
+    override fun add(
+        primaryAction: (() -> Unit)?,
+        secondaryAction: (() -> Unit)?
+    ): CluesFocusable {
+        val new = CluesFocusable(
+            manager = this,
+            primaryAction = primaryAction,
+            secondaryAction = secondaryAction
+        )
+        focusables.add(new)
+        return new
+    }
+
+    override fun doOnKeyEvent(event: KeyEvent): Boolean {
+        val rows = focusables.size ceilDiv columns
+
+        when (event.key) {
+            Key.DirectionDown -> {
+                row++
+                if (row >= rows) {
+                    row = 0
+                }
+            }
+
+            Key.DirectionUp -> {
+                row--
+                if (row < 0) {
+                    row = rows - 1
+                }
+            }
+
+            Key.DirectionRight -> {
+                col++
+                if (col >= columns) {
+                    col = 0
+                }
+            }
+
+            Key.DirectionLeft -> {
+                col--
+                if (col < 0) {
+                    col = columns - 1
+                }
+            }
+
+            else -> return focused?.child?.onKeyEvent(event) == true
+        }
+
+        // This makes sure the limits aren't exceeded when values are changed concurrently
+        val index = max(0, min(row * columns + col, focusables.size - 1))
+        focused = focusables[index]
+
+        return true
+    }
+}

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

@@ -0,0 +1,21 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.FocusState
+
+class FocusFollowingFocusable(
+    manager: FocusFollowingSelectionManager,
+    primaryAction: (() -> Unit)?,
+    secondaryAction: (() -> Unit)?
+) : Focusable<FocusFollowingFocusable>(manager, primaryAction, secondaryAction) {
+
+    val focusRequester = FocusRequester()
+
+    fun setFocus(state: FocusState) {
+        if (state.hasFocus) {
+            manager.focused = this
+        } else if (manager.focused === this) {
+            manager.focused = null
+        }
+    }
+}

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

@@ -0,0 +1,24 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.KeyEvent
+
+object FocusFollowingSelectionManager : SelectionManager<FocusFollowingFocusable>() {
+    init {
+        isActive = true
+    }
+
+    override fun add(
+        primaryAction: (() -> Unit)?,
+        secondaryAction: (() -> Unit)?
+    ): FocusFollowingFocusable {
+        return FocusFollowingFocusable(
+            manager = this,
+            primaryAction = primaryAction,
+            secondaryAction = secondaryAction
+        )
+    }
+
+    // Key events are ignored, the default focus mechanisms are used
+    override fun doOnKeyEvent(event: KeyEvent): Boolean = focused?.child?.onKeyEvent(event) == true
+
+}

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

@@ -0,0 +1,27 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.KeyEvent
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.combine
+
+abstract class Focusable<F : Focusable<F>>(
+    protected val manager: SelectionManager<F>,
+    val primaryAction: (() -> Unit)?,
+    val secondaryAction: (() -> Unit)?,
+    var onKeyEvent: ((KeyEvent) -> Boolean)? = null
+) {
+
+    val hasFocus: Flow<Boolean> =
+        combine(manager.isActiveFlow, manager.focusedFlow) { isActive, focused ->
+            isActive && focused == this
+        }
+
+    var child: SelectionManager<*>? = null
+        private set
+
+    fun <M : SelectionManager<*>> create(selectionManager: M): M = selectionManager.apply {
+        isActive = manager.isActive && manager.focused == this@Focusable
+        this@Focusable.child = this
+    }
+
+}

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

@@ -0,0 +1,10 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.KeyEvent
+
+class GridFocusable(
+    manager: GridSelectionManager,
+    primaryAction: (() -> Unit)?,
+    secondaryAction: (() -> Unit)?,
+    onKeyEvent: ((KeyEvent) -> Boolean)? = null
+) : Focusable<GridFocusable>(manager, primaryAction, secondaryAction, onKeyEvent)

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

@@ -0,0 +1,81 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEvent
+import androidx.compose.ui.input.key.key
+
+class GridSelectionManager : SelectionManager<GridFocusable>() {
+
+    val grid = mutableListOf<MutableList<GridFocusable>>()
+
+    var row = 0
+    var col = 0
+
+    fun addRow(): GridSelectionManager {
+        grid.add(mutableListOf())
+        return this
+    }
+
+    fun add(onKeyEvent: (KeyEvent) -> Boolean): GridFocusable {
+        val new = GridFocusable(
+            manager = this,
+            primaryAction = null,
+            secondaryAction = null,
+            onKeyEvent = onKeyEvent
+        )
+        grid.last().add(new)
+        return new
+    }
+
+    override fun add(
+        primaryAction: (() -> Unit)?,
+        secondaryAction: (() -> Unit)?
+    ): GridFocusable {
+        val new = GridFocusable(
+            manager = this,
+            primaryAction = primaryAction,
+            secondaryAction = secondaryAction
+        )
+        grid.last().add(new)
+        return new
+    }
+
+    override fun doOnKeyEvent(event: KeyEvent): Boolean {
+        if (grid.isEmpty()) return false
+
+        when (event.key) {
+            Key.DirectionDown -> {
+                row++
+                if (row >= grid.size) {
+                    row = 0
+                }
+            }
+
+            Key.DirectionUp -> {
+                row--
+                if (row < 0) {
+                    row = grid.size - 1
+                }
+            }
+
+            Key.DirectionRight -> {
+                col++
+                if (col >= grid[row].size) {
+                    col = 0
+                }
+            }
+
+            Key.DirectionLeft -> {
+                col--
+                if (col < 0) {
+                    col = grid[row].size - 1
+                }
+            }
+
+            else -> return focused?.child?.onKeyEvent(event) == true
+        }
+
+        focused = grid[row][col]
+        return true
+    }
+}

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

@@ -0,0 +1,21 @@
+package ch.dissem.yaep.ui.common.focus
+
+class LinearFocusable(
+    manager: LinearSelectionManager,
+    primaryAction: (() -> Unit)?,
+    secondaryAction: (() -> Unit)?
+) : Focusable<LinearFocusable>(manager, primaryAction, secondaryAction) {
+
+    var previous: LinearFocusable = this
+        private set
+
+    private var _next: LinearFocusable = this
+    var next: LinearFocusable
+        get() = _next
+        set(value) {
+            previous = value.previous
+            previous._next = this
+            value.previous = this
+            _next = value
+        }
+}

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

@@ -0,0 +1,52 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEvent
+import androidx.compose.ui.input.key.isShiftPressed
+import androidx.compose.ui.input.key.key
+
+class LinearSelectionManager(
+    val keyNext: Key,
+    val keyPrevious: Key? = null
+) : SelectionManager<LinearFocusable>() {
+
+    private fun focusNext() {
+        focused = focused?.next
+    }
+
+    private fun focusPrevious() {
+        focused = focused?.previous
+    }
+
+    override fun add(
+        primaryAction: (() -> Unit)?,
+        secondaryAction: (() -> Unit)?
+    ): LinearFocusable {
+        val new = LinearFocusable(
+            manager = this,
+            primaryAction = primaryAction,
+            secondaryAction = secondaryAction
+        )
+        if (focused != null) {
+            new.next = focused!!
+        } else {
+            focused = new
+        }
+        return new
+    }
+
+    override fun doOnKeyEvent(event: KeyEvent): Boolean {
+        if (event.key == keyNext) {
+            if (keyPrevious == null && event.isShiftPressed) {
+                focusPrevious()
+            } else {
+                focusNext()
+            }
+        } else if (event.key == keyPrevious) {
+            focusPrevious()
+        } else {
+            return focused?.child?.onKeyEvent(event) == true
+        }
+        return true
+    }
+}

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

@@ -0,0 +1,61 @@
+package ch.dissem.yaep.ui.common.focus
+
+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.key
+import androidx.compose.ui.input.key.type
+import kotlinx.coroutines.flow.MutableStateFlow
+
+abstract class SelectionManager<F : Focusable<F>> {
+    var isActiveFlow = MutableStateFlow<Boolean>(false)
+    var isActive: Boolean
+        get() = isActiveFlow.value
+        set(value) {
+            isActiveFlow.value = value
+        }
+
+    var focusedFlow = MutableStateFlow<F?>(null)
+
+    var focused: F?
+        get() = focusedFlow.value
+        set(value) {
+            val previous = focusedFlow.value
+            if (previous != value) {
+                previous?.child?.isActive = false
+                value?.child?.isActive = true
+                focusedFlow.value = value
+            }
+        }
+
+    fun add(): F = add(null, null)
+
+    fun add(primaryAction: () -> Unit): F = add(primaryAction, null)
+
+    abstract fun add(
+        primaryAction: (() -> Unit)?,
+        secondaryAction: (() -> Unit)?
+    ): F
+
+    fun onKeyEvent(event: KeyEvent): Boolean {
+        if (event.type != KeyEventType.KeyUp) return false
+
+        return when (event.key) {
+            Key.Spacebar, Key.Enter -> {
+                focused?.primaryAction?.invoke() != null ||
+                        focused?.onKeyEvent?.invoke(event) == true ||
+                        focused?.child?.onKeyEvent(event) == true
+            }
+
+            Key.Delete, Key.Backspace -> {
+                focused?.secondaryAction?.invoke() != null ||
+                        focused?.onKeyEvent?.invoke(event) == true ||
+                        focused?.child?.onKeyEvent(event) == true
+            }
+
+            else -> focused?.onKeyEvent?.invoke(event) == true || doOnKeyEvent(event)
+        }
+    }
+
+    protected abstract fun doOnKeyEvent(event: KeyEvent): Boolean
+}

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

@@ -2,6 +2,7 @@ package ch.dissem.yaep.ui.common
 
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.RowScope
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.wrapContentHeight
@@ -12,6 +13,10 @@ 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.input.key.KeyEvent
+import androidx.compose.ui.input.key.isShiftPressed
+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
@@ -19,11 +24,12 @@ 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 ch.dissem.yaep.ui.common.focus.GridSelectionManager
 
 @Composable
 fun PuzzleGrid(
     modifier: Modifier = Modifier,
-    selectDirectly: Boolean,
+    selectionManager: GridSelectionManager,
     spacing: Dp = 8.dp,
     grid: Grid,
     onUpdate: () -> Unit
@@ -36,7 +42,7 @@ fun PuzzleGrid(
                 onSnapshot = { grid.snapshot() },
                 onUndo = { grid.undo() },
                 spacing = spacing,
-                selectDirectly = selectDirectly
+                selectionManager = remember(selectionManager) { selectionManager.addRow() }
             )
         }
     }
@@ -49,18 +55,40 @@ private fun PuzzleRow(
     onSnapshot: () -> Unit,
     onUndo: () -> Boolean,
     spacing: Dp,
-    selectDirectly: Boolean
+    selectionManager: GridSelectionManager
 ) {
     Row(
         modifier = Modifier
             .fillMaxWidth()
             .wrapContentHeight()
     ) {
-        val allOptions = row.options
         for (cell in row) {
+            PuzzleCell(
+                cell,
+                row,
+                onUpdate,
+                onSnapshot,
+                onUndo,
+                spacing,
+                selectionManager
+            )
+        }
+    }
+}
+
+@Composable
+private fun RowScope.PuzzleCell(
+    cell: GameCell<ItemClass<*>>,
+    row: GameRow<ItemClass<*>>,
+    onUpdate: () -> Unit,
+    onSnapshot: () -> Unit,
+    onUndo: () -> Boolean,
+    spacing: Dp,
+    selectionManager: GridSelectionManager
+) {
     var selection by remember(cell) { mutableStateOf(cell.selection) }
     val options = remember(cell) {
-                allOptions.map { Toggleable(it, cell.options.contains(it)) }
+        row.options.map { Toggleable(it, cell.options.contains(it)) }
     }
     LaunchedEffect(cell) {
         cell.optionsChangedListeners.add { enabled ->
@@ -71,17 +99,24 @@ private fun PuzzleRow(
             onUpdate()
         }
     }
+    val focusable = remember(cell, selectionManager) {
+        selectionManager.add { e ->
+            if (selection != null) {
+                handleClearSelection(e.key, row, cell, options, onSnapshot, onUndo)
+            } else {
+                handleSelection(e, options, cell, row, onSnapshot, onUndo)
+            }
+        }
+    }
     Selector(
         modifier = Modifier
+            .focus(focusable)
             .padding(spacing)
             .weight(1f),
         spacing,
-                selectDirectly = selectDirectly,
         options = options,
-                onOptionRemoved = {
-                    onSnapshot()
-                    cell.options.remove(it)
-                    row.cleanupOptions()
+        onOptionRemoved = { selectedItem ->
+            onOptionRemoved(row, cell, selectedItem, onSnapshot)
         },
         onOptionAdded = {
             cell.options.add(it)
@@ -91,8 +126,73 @@ private fun PuzzleRow(
             onSelectItem(row, cell, options, selectedItem, onSnapshot, onUndo)
         }
     )
+}
+
+private fun handleSelection(
+    e: KeyEvent,
+    options: List<Toggleable<Item<ItemClass<*>>>>,
+    cell: GameCell<ItemClass<*>>,
+    row: GameRow<ItemClass<*>>,
+    onSnapshot: () -> Unit,
+    onUndo: () -> Boolean
+): Boolean {
+    val i = getNumber(e)
+    return if (i != null && i in 1..options.size) {
+        val selectedItem = options[i - 1].item
+        if (e.isShiftPressed) {
+            if (cell.options.contains(selectedItem)) {
+                onOptionRemoved(row, cell, selectedItem, onSnapshot)
+            } else {
+                cell.options.add(selectedItem)
             }
+        } else {
+            onSelectItem(row, cell, options, selectedItem, onSnapshot, onUndo)
         }
+        true
+    } else {
+        false
+    }
+}
+
+private fun handleClearSelection(
+    key: Key,
+    row: GameRow<ItemClass<*>>,
+    cell: GameCell<ItemClass<*>>,
+    options: List<Toggleable<Item<ItemClass<*>>>>,
+    onSnapshot: () -> Unit,
+    onUndo: () -> Boolean
+): Boolean = when (key) {
+    Key.Spacebar, Key.Enter, Key.Delete, Key.Backspace -> {
+        onSelectItem(row, cell, options, null, onSnapshot, onUndo)
+        true
+    }
+
+    else -> false
+}
+
+private fun onOptionRemoved(
+    row: GameRow<ItemClass<*>>,
+    cell: GameCell<ItemClass<*>>,
+    selectedItem: Item<ItemClass<*>>?,
+    onSnapshot: () -> Unit
+) {
+    onSnapshot()
+    cell.options.remove(selectedItem)
+    row.cleanupOptions()
+}
+
+private fun getNumber(e: KeyEvent): Int? = when (e.key) {
+    Key.Zero, Key.NumPad0 -> 0
+    Key.One, Key.NumPad1 -> 1
+    Key.Two, Key.NumPad2 -> 2
+    Key.Three, Key.NumPad3 -> 3
+    Key.Four, Key.NumPad4 -> 4
+    Key.Five, Key.NumPad5 -> 5
+    Key.Six, Key.NumPad6 -> 6
+    Key.Seven, Key.NumPad7 -> 7
+    Key.Eight, Key.NumPad8 -> 8
+    Key.Nine, Key.NumPad9 -> 9
+    else -> null
 }
 
 private fun onSelectItem(

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

@@ -0,0 +1,21 @@
+package ch.dissem.yaep.ui.common.layout
+
+import androidx.compose.ui.unit.Constraints
+
+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
+            }
+        }
+    }
+}

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

@@ -0,0 +1,17 @@
+package ch.dissem.yaep.ui.common.layout
+
+import androidx.compose.ui.layout.Measurable
+import ch.dissem.yaep.ui.common.focus.CluesSelectionManager
+
+data class FocusGroup(
+    val items: List<Measurable>,
+    val box: Measurable,
+    val selectionManger: CluesSelectionManager? = null
+) {
+    val item: Measurable
+        get() = items.single()
+
+    val hasItems: Boolean = items.isNotEmpty()
+
+    val count = items.size
+}

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

@@ -0,0 +1,164 @@
+package ch.dissem.yaep.ui.common.layout
+
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.Layout
+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.Dp
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.ui.common.focus.CluesSelectionManager
+import ch.dissem.yaep.ui.common.focus.FocusFollowingFocusable
+import ch.dissem.yaep.ui.common.focus.GridSelectionManager
+import ch.dissem.yaep.ui.common.focus.SelectionManager
+import ch.dissem.yaep.ui.common.layout.AspectRatio.LANDSCAPE
+import ch.dissem.yaep.ui.common.layout.AspectRatio.PORTRAIT
+import ch.dissem.yaep.ui.common.layout.AspectRatio.SQUARISH
+import kotlin.math.ceil
+import kotlin.math.max
+
+
+@Composable
+fun AdaptiveGameLayout(
+    modifier: Modifier = Modifier,
+    selectionManager: SelectionManager<FocusFollowingFocusable>,
+    grid: @Composable (GridSelectionManager) -> Unit,
+    horizontalClues: @Composable (SelectionManager<*>) -> Unit,
+    verticalClues: @Composable (SelectionManager<*>) -> Unit,
+    time: @Composable () -> Unit,
+    spacing: Dp = 8.dp,
+    vararg resetBeacons: Any
+) {
+    val gridFocusable = remember(*resetBeacons) { selectionManager.add() }
+    val gridSelectionManager = remember(*resetBeacons) {  gridFocusable.create(GridSelectionManager()) }
+
+    val horizontalCluesFocusable = remember(*resetBeacons) { selectionManager.add() }
+    val horizontalCluesSelectionManager = remember(*resetBeacons) {
+        horizontalCluesFocusable.create(CluesSelectionManager())
+    }
+
+    val verticalCluesFocusable = remember(*resetBeacons) { selectionManager.add() }
+    val verticalCluesSelectionManager = remember(*resetBeacons) {
+        verticalCluesFocusable.create(CluesSelectionManager())
+    }
+    Layout(
+        contents = listOf(
+            { grid(gridSelectionManager) },
+            { FocusBox(gridFocusable, requestFocus = true) },
+            { horizontalClues(horizontalCluesSelectionManager) },
+            { FocusBox(horizontalCluesFocusable) },
+            { verticalClues(verticalCluesSelectionManager) },
+            { FocusBox(verticalCluesFocusable) },
+            time,
+            {
+                HorizontalDivider()
+                HorizontalDivider()
+            }
+        ),
+        modifier = modifier
+    ) { measurables, constraints ->
+        layout(width = constraints.maxWidth, height = constraints.maxHeight) {
+            val aspectRatio = AspectRatio.from(constraints)
+
+            val gridGroup = FocusGroup(
+                items = measurables[0],
+                box = measurables[1][0],
+            )
+            val horizontalCluesGroup = FocusGroup(
+                items = measurables[2],
+                box = measurables[3][0],
+                selectionManger = horizontalCluesSelectionManager
+            )
+            val verticalCluesGroup = FocusGroup(
+                items = measurables[4],
+                box = measurables[5][0],
+                selectionManger = verticalCluesSelectionManager
+            )
+            val timeMeasurable = measurables[6][0]
+            val dividerMeasurables = measurables[7]
+
+            val spacingPx = spacing.roundToPx()
+
+            when (aspectRatio) {
+                PORTRAIT -> {
+                    portrait(
+                        constraints,
+                        spacingPx,
+                        gridGroup,
+                        horizontalCluesGroup,
+                        verticalCluesGroup,
+                        timeMeasurable,
+                        dividerMeasurables
+                    )
+                }
+
+                SQUARISH -> {
+                    squarish(
+                        constraints,
+                        spacingPx,
+                        gridGroup,
+                        horizontalCluesGroup,
+                        verticalCluesGroup,
+                        timeMeasurable
+                    )
+                }
+
+                LANDSCAPE -> {
+                    landscape(
+                        constraints,
+                        spacingPx,
+                        gridGroup,
+                        horizontalCluesGroup,
+                        verticalCluesGroup,
+                        timeMeasurable,
+                        dividerMeasurables[0]
+                    )
+                }
+            }
+        }
+    }
+}
+
+internal fun cluesBoxConstraints(
+    width: Int,
+    itemConstraints: Constraints,
+    group: FocusGroup
+): Constraints {
+    val columns = width / itemConstraints.maxWidth
+    group.selectionManger?.columns = columns
+    return fixed(
+        width,
+        itemConstraints.maxHeight * ceil(group.count.toFloat() / columns).toInt()
+    )
+}
+
+internal 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/layout/focus box.kt

@@ -0,0 +1,44 @@
+package ch.dissem.yaep.ui.common.layout
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.focusable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.focus.onFocusEvent
+import androidx.compose.ui.graphics.Color
+import ch.dissem.yaep.ui.common.focus.FocusFollowingFocusable
+
+@Composable
+fun FocusBox(focusable: FocusFollowingFocusable, requestFocus: Boolean = false) {
+    val hasFocus by focusable.hasFocus.collectAsState(false)
+    Box(
+        modifier = Modifier
+            .focusRequester(focusable.focusRequester)
+            .onFocusEvent { state ->
+                focusable.setFocus(state)
+            }
+            .onFocusChanged {}
+            .focusable()
+            .clip(MaterialTheme.shapes.small)
+            .background(
+                if (hasFocus) {
+                    MaterialTheme.colorScheme.surfaceContainerHigh
+                } else {
+                    Color.Transparent
+                }
+            ),
+    )
+    if (requestFocus) {
+        LaunchedEffect(Unit) {
+            focusable.focusRequester.requestFocus()
+        }
+    }
+}

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

@@ -0,0 +1,99 @@
+package ch.dissem.yaep.ui.common.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
+
+internal fun Placeable.PlacementScope.landscape(
+    constraints: Constraints,
+    spacingPx: Int,
+    grid: FocusGroup,
+    horizontalClues: FocusGroup,
+    verticalClues: FocusGroup,
+    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 = grid.item.measure(gridConstraints)
+    val gridBoxPlaceable = grid.box.measure(gridConstraints)
+    val horizontalCluesPlaceables = horizontalClues.items.map {
+        it.measure(horizontalCluesConstraints)
+    }
+    val horizontalCluesBoxPlaceable = horizontalClues.box
+        .measure(
+            cluesBoxConstraints(
+                width = rightBarWidth,
+                itemConstraints = horizontalCluesConstraints,
+                group = horizontalClues
+            )
+        )
+
+    val verticalCluesPlaceables = verticalClues.items.map {
+        it.measure(verticalCluesConstraints)
+    }
+    val verticalCluesBoxPlaceable = verticalClues.box
+        .measure(
+            cluesBoxConstraints(
+                width = rightBarWidth,
+                itemConstraints = verticalCluesConstraints,
+                group = verticalClues
+            )
+        )
+
+    val timePlaceable = timeMeasurable.measure(timeConstraints)
+    val dividerPlaceable = dividerMeasurable.measure(dividerConstraints)
+
+    // Position the grid
+    gridBoxPlaceable.place(0, 0)
+    gridPlaceable.place(0, 0)
+
+    // Position the horizontal clues4
+    val horizontalCluesOffsetX = gridSize + 2 * spacingPx
+    horizontalCluesBoxPlaceable.place(horizontalCluesOffsetX, 0)
+    val offsetY = placeClues(
+        placeables = horizontalCluesPlaceables,
+        offsetX = horizontalCluesOffsetX,
+        offsetY = 0,
+        maxWidth = rightBarWidth
+    )
+
+    if (verticalClues.hasItems) {
+        // Add divider in between
+        dividerPlaceable.place(gridSize + 3 * spacingPx, offsetY + spacingPx)
+
+        // Position the vertical clues
+        val verticalCluesOffsetX = gridSize + 2 * spacingPx
+        val verticalCluesOffsetY = offsetY + spacingPx + dividerPlaceable.height
+        verticalCluesBoxPlaceable.place(verticalCluesOffsetX, verticalCluesOffsetY)
+        placeClues(
+            placeables = verticalCluesPlaceables,
+            offsetX = verticalCluesOffsetX,
+            offsetY = verticalCluesOffsetY,
+            maxWidth = rightBarWidth
+        )
+    }
+
+    // Position the time
+    timePlaceable.place(
+        x = constraints.maxWidth - timePlaceable.width - spacingPx,
+        y = constraints.maxHeight - timePlaceable.height
+    )
+}

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

@@ -0,0 +1,115 @@
+package ch.dissem.yaep.ui.common.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
+
+internal fun Placeable.PlacementScope.portrait(
+    constraints: Constraints,
+    spacingPx: Int,
+    grid: FocusGroup,
+    horizontalClues: FocusGroup,
+    verticalClues: FocusGroup,
+    timeMeasurable: Measurable,
+    dividerMeasurables: List<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 = grid.item.measure(gridConstraints)
+    val gridBoxPlaceable = grid.box.measure(gridConstraints)
+    val horizontalCluesPlaceables = horizontalClues.items.map {
+        it.measure(horizontalCluesConstraints)
+    }
+    val verticalCluesPlaceables = verticalClues.items.map {
+        it.measure(verticalCluesConstraints)
+    }
+    val timePlaceable = timeMeasurable.measure(timeConstraints)
+    val divider1Placeable = dividerMeasurables[0].measure(dividerConstraints)
+    val divider2Placeable = dividerMeasurables[1].measure(dividerConstraints)
+
+    val horizontalCluesBoxPlaceable = horizontalClues.box
+        .measure(
+            cluesBoxConstraints(
+                width = gridSize,
+                itemConstraints = horizontalCluesConstraints,
+                group = horizontalClues
+            )
+        )
+    val verticalCluesBoxPlaceable = verticalClues.box
+        .measure(
+            cluesBoxConstraints(
+                width = gridSize,
+                itemConstraints = verticalCluesConstraints,
+                group = verticalClues
+            )
+        )
+
+    // Position the grid
+    gridBoxPlaceable.place(0, 0)
+    gridPlaceable.place(0, 0)
+
+    divider1Placeable.place(0, gridSize + spacingPx)
+
+    // Position the horizontal clues
+    val horizontalCluesOffsetY = gridSize + 2 * spacingPx
+
+    horizontalCluesBoxPlaceable.place(0, horizontalCluesOffsetY)
+    var offsetY = placeClues(
+        placeables = horizontalCluesPlaceables,
+        offsetX = 0,
+        offsetY = horizontalCluesOffsetY,
+        maxWidth = gridSize
+    )
+
+    if (verticalClues.hasItems) {
+        // Add divider in between
+        divider2Placeable.place(0, offsetY + spacingPx)
+
+        // Position the vertical clues
+        val verticalCluesOffsetY = offsetY + spacingPx + divider2Placeable.height
+        verticalCluesBoxPlaceable.place(0, verticalCluesOffsetY)
+        offsetY = placeClues(
+            placeables = verticalCluesPlaceables,
+            offsetX = 0,
+            offsetY = verticalCluesOffsetY,
+            maxWidth = gridSize
+        )
+        verticalCluesBoxPlaceable.place(0, verticalCluesOffsetY)
+    }
+    // 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
+        )
+    }
+}

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

@@ -0,0 +1,91 @@
+package ch.dissem.yaep.ui.common.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 kotlin.math.min
+
+internal fun Placeable.PlacementScope.squarish(
+    constraints: Constraints,
+    spacingPx: Int,
+    grid: FocusGroup,
+    horizontalClues: FocusGroup,
+    verticalClues: FocusGroup,
+    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 = grid.item.measure(gridConstraints)
+    val gridBoxPlaceable = grid.box.measure(gridConstraints)
+    val horizontalCluesPlaceables = horizontalClues.items.map {
+        it.measure(horizontalCluesConstraints)
+    }
+    val horizontalCluesBoxPlaceable = horizontalClues.box
+        .measure(
+            cluesBoxConstraints(
+                width = rightBarWidth,
+                itemConstraints = horizontalCluesConstraints,
+                group = horizontalClues
+            )
+        )
+
+    val verticalCluesPlaceables = verticalClues.items.map {
+        it.measure(verticalCluesConstraints)
+    }
+    val verticalCluesBoxPlaceable = verticalClues.box
+        .measure(
+            cluesBoxConstraints(
+                width = rightBarWidth,
+                itemConstraints = verticalCluesConstraints,
+                group = verticalClues
+            )
+        )
+    val timePlaceable = timeMeasurable.measure(timeConstraints)
+
+    // Position the grid
+    gridBoxPlaceable.place(0, 0)
+    gridPlaceable.place(0, 0)
+
+    // Position the horizontal clues
+    val horizontalCluesOffsetX = gridSize + 2 * spacingPx
+    horizontalCluesBoxPlaceable.place(horizontalCluesOffsetX, 0)
+    placeClues(
+        placeables = horizontalCluesPlaceables,
+        offsetX = horizontalCluesOffsetX,
+        offsetY = 0,
+        maxWidth = rightBarWidth
+    )
+
+    if (verticalClues.hasItems) {
+        // Position the vertical clues
+        val verticalCluesOffsetY = gridSize + 2 * spacingPx
+        verticalCluesBoxPlaceable.place(0, verticalCluesOffsetY)
+        placeClues(
+            placeables = verticalCluesPlaceables,
+            offsetX = 0,
+            offsetY = verticalCluesOffsetY,
+            maxWidth = gridSize
+        )
+    }
+
+    // Position the time
+    timePlaceable.place(
+        x = constraints.maxWidth - timePlaceable.width - spacingPx,
+        y = constraints.maxHeight - timePlaceable.height
+    )
+}

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

@@ -0,0 +1,8 @@
+package ch.dissem.yaep.ui.common
+
+import kotlin.math.absoluteValue
+import kotlin.math.sign
+
+infix fun Int.ceilDiv(other: Int): Int {
+    return this.floorDiv(other) + this.rem(other).sign.absoluteValue
+}

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

@@ -13,16 +13,15 @@ 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.bubble_tea
 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
@@ -41,6 +40,7 @@ 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.mate
 import yaep.commonui.generated.resources.milk
 import yaep.commonui.generated.resources.motor_scooter
 import yaep.commonui.generated.resources.norwegian
@@ -63,8 +63,8 @@ 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.water
 import yaep.commonui.generated.resources.watermelon
-import yaep.commonui.generated.resources.mate
 import yaep.commonui.generated.resources.zebra
 
 val ItemClass<*>.localName: StringResource

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

@@ -1,7 +1,6 @@
 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
@@ -20,6 +19,7 @@ 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 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
@@ -28,8 +28,7 @@ import kotlin.math.min
 @Composable
 fun <C : ItemClass<C>> Selector(
     modifier: Modifier = Modifier,
-    spacing: Dp,
-    selectDirectly: Boolean,
+    spacing: Dp = 4.dp,
     options: List<Toggleable<Item<C>>>,
     onOptionRemoved: (Item<C>) -> Unit,
     onOptionAdded: (Item<C>) -> Unit,
@@ -40,7 +39,7 @@ fun <C : ItemClass<C>> Selector(
     if (selectedItem != null) {
         DrawItem(
             item = selectedItem,
-            modifier = modifier.clickable { onSelectItem(null) },
+            modifier = modifier.onEitherPointerAction { onSelectItem(null) },
             spacing = radius
         )
     } else {
@@ -83,8 +82,8 @@ fun <C : ItemClass<C>> Selector(
 @Composable
 fun <C : ItemClass<C>> DrawItem(
     modifier: Modifier = Modifier,
-    spacing: Dp,
-    item: Item<C>
+    item: Item<C>,
+    spacing: Dp = 4.dp
 ) {
     OutlinedCard(modifier = modifier.aspectRatio(1f), shape = RoundedCornerShape(spacing)) {
         val emoji = item.symbol

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

@@ -1,4 +1,5 @@
 package ch.dissem.yaep.ui.common.theme
+
 import androidx.compose.ui.graphics.Color
 
 val primaryLight = Color(0xFF6D5E0F)

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

@@ -0,0 +1,39 @@
+package ch.dissem.yaep.ui.common
+
+import androidx.compose.foundation.border
+import androidx.compose.foundation.focusable
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.focus.onFocusEvent
+import androidx.compose.ui.graphics.RectangleShape
+import androidx.compose.ui.unit.dp
+import ch.dissem.yaep.ui.common.focus.FocusFollowingFocusable
+import ch.dissem.yaep.ui.common.focus.Focusable
+
+@Composable
+fun Modifier.focus(focusable: Focusable<*>): Modifier {
+    var m = this
+    val hasFocus by focusable.hasFocus.collectAsState(false)
+    if (hasFocus) {
+        m = m.border(
+            width = 2.dp,
+            color = MaterialTheme.colorScheme.primary,
+            shape = RectangleShape
+        )
+    }
+    if (focusable is FocusFollowingFocusable) {
+        m = m
+            .focusRequester(focusable.focusRequester)
+            .onFocusEvent { state ->
+                focusable.setFocus(state)
+            }
+            .onFocusChanged {}
+            .focusable()
+    }
+    return m
+}

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

@@ -0,0 +1,96 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.Key
+import ch.tutteli.atrium.api.fluent.en_GB.toEqual
+import ch.tutteli.atrium.api.verbs.expect
+import kotlin.test.Test
+
+class CluesSelectionManagerTest : SelectionManagerTest<CluesSelectionManager>() {
+
+    var primaryActionCalled: Int? = null
+    var secondaryActionCalled: Int? = null
+
+    lateinit var focusables: MutableList<CluesFocusable>
+
+    override fun setUp() {
+        manager = CluesSelectionManager()
+
+        primaryActionCalled = null
+        secondaryActionCalled = null
+        focusables = mutableListOf()
+        for (i in 0..10) {
+            focusables.add(
+                manager.add(
+                    primaryAction = {
+                        primaryActionCalled = i
+                    },
+                    secondaryAction = {
+                        secondaryActionCalled = i
+                    }
+                )
+            )
+        }
+        manager.columns = 3
+    }
+
+    @Test
+    fun ensure_navigation_right_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionRight))
+        expect(manager.focused).toEqual(focusables[1])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionRight))
+        expect(manager.focused).toEqual(focusables[2])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionRight))
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+    @Test
+    fun ensure_navigation_left_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[2])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[1])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[0])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[2])
+    }
+
+    @Test
+    fun ensure_navigation_down_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[3])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[6])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[9])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+    @Test
+    fun ensure_navigation_up_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[9])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[6])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[3])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[0])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[9])
+    }
+
+}

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

@@ -0,0 +1,80 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.Key
+import ch.tutteli.atrium.api.fluent.en_GB.toEqual
+import ch.tutteli.atrium.api.verbs.expect
+import kotlin.test.Test
+
+class GridSelectionManagerTest : SelectionManagerTest<GridSelectionManager>() {
+
+    lateinit var focusables: MutableList<GridFocusable>
+
+    override fun setUp() {
+        manager = GridSelectionManager()
+
+        focusables = mutableListOf()
+        repeat(3) {
+            manager.addRow()
+            repeat(3) {
+                focusables.add(
+                    manager.add()
+                )
+            }
+        }
+    }
+
+    @Test
+    fun ensure_navigation_right_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionRight))
+        expect(manager.focused).toEqual(focusables[1])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionRight))
+        expect(manager.focused).toEqual(focusables[2])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionRight))
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+    @Test
+    fun ensure_navigation_left_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[2])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[1])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[0])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionLeft))
+        expect(manager.focused).toEqual(focusables[2])
+    }
+
+    @Test
+    fun ensure_navigation_down_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[3])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[6])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionDown))
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+    @Test
+    fun ensure_navigation_up_cycles() {
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[6])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[3])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[0])
+
+        manager.onKeyEvent(keyEvent(Key.DirectionUp))
+        expect(manager.focused).toEqual(focusables[6])
+    }
+
+}

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

@@ -0,0 +1,73 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.input.key.Key
+import ch.tutteli.atrium.api.fluent.en_GB.toEqual
+import ch.tutteli.atrium.api.verbs.expect
+import kotlin.test.Test
+
+class LinearSelectionManagerTest : SelectionManagerTest<LinearSelectionManager>() {
+
+    override fun setUp() {
+        manager = LinearSelectionManager(
+            keyNext = Key.A,
+            keyPrevious = Key.B
+        )
+    }
+
+    @Test
+    fun ensure_manager_with_focusables_has_focus_on_first_item() {
+        val focusables = arrayOf(
+            manager.add(),
+            manager.add()
+        )
+
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+    @Test
+    fun ensure_keyEvent_A_selects_next() {
+        val focusables = arrayOf(
+            manager.add(),
+            manager.add(),
+            manager.add()
+        )
+
+        manager.onKeyEvent(keyEvent(Key.A))
+        expect(manager.focused).toEqual(focusables[1])
+
+        manager.onKeyEvent(keyEvent(Key.A))
+        expect(manager.focused).toEqual(focusables[2])
+    }
+
+    @Test
+    fun ensure_keyEvent_B_selects_previous() {
+        val focusables = arrayOf(
+            manager.add(),
+            manager.add(),
+            manager.add()
+        )
+        manager.focused = focusables[2]
+
+        manager.onKeyEvent(keyEvent(Key.B))
+        expect(manager.focused).toEqual(focusables[1])
+
+        manager.onKeyEvent(keyEvent(Key.B))
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+    @Test
+    fun ensure_ring_behaviour() {
+        val focusables = arrayOf(
+            manager.add(),
+            manager.add(),
+            manager.add()
+        )
+
+        manager.onKeyEvent(keyEvent(Key.B))
+        expect(manager.focused).toEqual(focusables[2])
+
+        manager.onKeyEvent(keyEvent(Key.A))
+        expect(manager.focused).toEqual(focusables[0])
+    }
+
+}

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

@@ -0,0 +1,21 @@
+package ch.dissem.yaep.ui.common.focus
+
+import androidx.compose.ui.InternalComposeUiApi
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEvent
+import androidx.compose.ui.input.key.KeyEventType
+import kotlin.test.BeforeTest
+
+abstract class SelectionManagerTest<M : SelectionManager<*>> {
+    lateinit var manager: M
+
+    @BeforeTest
+    abstract fun setUp()
+
+    @OptIn(InternalComposeUiApi::class)
+    fun keyEvent(key: Key, type: KeyEventType = KeyEventType.KeyUp) = KeyEvent(
+        key = key,
+        type = type
+    )
+
+}

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

@@ -16,10 +16,12 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+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.focus.FocusFollowingSelectionManager
 import ch.dissem.yaep.ui.common.theme.AppTheme
 import org.jetbrains.compose.resources.painterResource
 import org.jetbrains.compose.resources.stringResource
@@ -40,11 +42,13 @@ import yaep.desktop.generated.resources.Res as DRes
 @Composable
 fun WindowScope.DesktopWindow(
     useDarkMode: Boolean,
+    selectionManager: FocusFollowingSelectionManager,
     topBar: @Composable () -> Unit,
     content: @Composable (PaddingValues) -> Unit
 ) {
     AppTheme(darkTheme = useDarkMode) {
         Scaffold(
+            modifier = Modifier.onKeyEvent { event -> selectionManager.onKeyEvent(event) },
             topBar = {
                 WindowDraggableArea {
                     topBar()

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

@@ -18,6 +18,7 @@ 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.focus.FocusFollowingSelectionManager
 import ch.dissem.yaep.ui.common.theme.emojiFontFamily
 import org.jetbrains.compose.resources.painterResource
 import org.jetbrains.compose.resources.stringResource
@@ -47,10 +48,12 @@ fun main(): Unit = application {
         state = windowState,
         icon = painterResource(DRes.drawable.ic_launcher)
     ) {
+        val rootSelectionManager = FocusFollowingSelectionManager
         var useDarkMode by remember { mutableStateOf(true) }
         var resetCluesBeacon by remember { mutableStateOf(Any()) }
         DesktopWindow(
             useDarkMode = useDarkMode,
+            selectionManager = rootSelectionManager,
             topBar = {
                 AppBar(
                     useDarkMode = useDarkMode,
@@ -67,8 +70,8 @@ fun main(): Unit = application {
         ) {
             App(
                 modifier = Modifier.padding(it),
+                rootSelectionManager = rootSelectionManager,
                 spacing = 8.dp,
-                selectDirectly = true,
                 game = game,
                 onNewGame = { game = generateGame() },
                 resetCluesBeacon = resetCluesBeacon