Improve hotkey handling, add support for volume buttons and spacebar. Closes #60

android/src/main/kotlin/ca/gosyer/jui/android/ReaderActivity.kt

@@ -12,16 +12,8 @@ import android.os.Bundle
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.ui.input.key.KeyEvent
-import androidx.compose.ui.input.key.key
-import androidx.lifecycle.lifecycleScope
-import ca.gosyer.jui.ui.base.model.StableHolder
 import ca.gosyer.jui.ui.base.theme.AppTheme
 import ca.gosyer.jui.ui.reader.ReaderMenu
-import ca.gosyer.jui.ui.reader.supportedKeyList
-import kotlinx.coroutines.flow.MutableSharedFlow
-import kotlinx.coroutines.flow.asSharedFlow
-import kotlinx.coroutines.launch
 
 class ReaderActivity : AppCompatActivity() {
 
@@ -35,9 +27,6 @@ class ReaderActivity : AppCompatActivity() {
         }
     }
 
-    private val hotkeyFlow = MutableSharedFlow<KeyEvent>()
-    private val hotkeyFlowHolder = StableHolder(hotkeyFlow.asSharedFlow())
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         val hooks = AppComponent.getInstance(applicationContext).hooks
@@ -55,26 +44,10 @@ class ReaderActivity : AppCompatActivity() {
                     ReaderMenu(
                         chapterIndex = chapterIndex,
                         mangaId = mangaId,
-                        hotkeyFlowHolder = hotkeyFlowHolder,
                         onCloseRequest = onBackPressedDispatcher::onBackPressed
                     )
                 }
             }
         }
     }
-
-    override fun onKeyUp(keyCode: Int, event: android.view.KeyEvent?): Boolean {
-        @Suppress("KotlinConstantConditions")
-        event ?: return super.onKeyUp(keyCode, event)
-        val composeKeyEvent = KeyEvent(event)
-        lifecycleScope.launch {
-            hotkeyFlow.emit(composeKeyEvent)
-        }
-
-        return if (composeKeyEvent.key in supportedKeyList) {
-            true
-        } else {
-            super.onKeyUp(keyCode, event)
-        }
-    }
 }

presentation/src/commonMain/kotlin/ca/gosyer/jui/ui/reader/ReaderMenu.kt

@@ -17,6 +17,7 @@ import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.animation.slideOutVertically
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.focusable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.BoxWithConstraints
@@ -44,15 +45,22 @@ import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.onFocusChanged
 import androidx.compose.ui.graphics.FilterQuality
 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.onKeyEvent
+import androidx.compose.ui.input.key.type
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
@@ -86,20 +94,8 @@ import ca.gosyer.jui.uicore.resources.stringResource
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.flow.SharedFlow
-import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.launch
 
-val supportedKeyList = listOf(
-    Key.W,
-    Key.DirectionUp,
-    Key.S,
-    Key.DirectionDown,
-    Key.A,
-    Key.DirectionLeft,
-    Key.D,
-    Key.DirectionRight
-)
-
 expect class ReaderLauncher {
     fun launch(
         chapterIndex: Int,
@@ -117,7 +113,6 @@ expect fun rememberReaderLauncher(): ReaderLauncher
 fun ReaderMenu(
     chapterIndex: Int,
     mangaId: Long,
-    hotkeyFlowHolder: StableHolder<SharedFlow<KeyEvent>>,
     onCloseRequest: () -> Unit
 ) {
     val viewModels = LocalViewModels.current
@@ -147,18 +142,29 @@ fun ReaderMenu(
     val currentPageOffset by vm.currentPageOffset.collectAsState()
     val readerSettingsMenuOpen by vm.readerSettingsMenuOpen.collectAsState()
 
-    LaunchedEffect(hotkeyFlowHolder) {
-        hotkeyFlowHolder.item.collectLatest {
-            when (it.key) {
-                Key.W, Key.DirectionUp -> vm.navigate(Navigation.PREV)
-                Key.S, Key.DirectionDown -> vm.navigate(Navigation.NEXT)
-                Key.A, Key.DirectionLeft -> vm.navigate(Navigation.LEFT)
-                Key.D, Key.DirectionRight -> vm.navigate(Navigation.RIGHT)
+    val focusRequester = remember { FocusRequester() }
+    var hasFocus by remember { mutableStateOf(false) }
+    Surface(
+        Modifier
+            .focusRequester(focusRequester)
+            .onFocusChanged {
+                hasFocus = it.hasFocus
             }
+            .focusable()
+            .onKeyEvent {
+                if (it.type != KeyEventType.KeyDown) return@onKeyEvent false
+                when (it.key) {
+                    Key.W, Key.DirectionUp -> vm.navigate(Navigation.PREV)
+                    Key.S, Key.DirectionDown -> vm.navigate(Navigation.NEXT)
+                    Key.A, Key.DirectionLeft -> vm.navigate(Navigation.LEFT)
+                    Key.D, Key.DirectionRight -> vm.navigate(Navigation.RIGHT)
+                    Key.VolumeDown -> vm.navigate(Navigation.DOWN)
+                    Key.VolumeUp -> vm.navigate(Navigation.UP)
+                    Key.Spacebar -> vm.navigate(Navigation.NEXT)
+                    else -> false
+                }
         }
-    }
-
-    Surface {
+    ) {
         Crossfade(state to chapter) { (state, chapter) ->
             if (state is ReaderChapter.State.Loaded && chapter != null) {
                 if (pages.isNotEmpty()) {
@@ -233,6 +239,13 @@ fun ReaderMenu(
             }
         }
     }
+
+
+    LaunchedEffect(hasFocus) {
+        if (!hasFocus) {
+            focusRequester.requestFocus()
+        }
+    }
 }
 
 @Composable

presentation/src/commonMain/kotlin/ca/gosyer/jui/ui/reader/ReaderMenuViewModel.kt

@@ -148,7 +148,7 @@ class ReaderMenuViewModel @Inject constructor(
         }
     }
 
-    fun navigate(navigationRegion: Navigation) {
+    fun navigate(navigationRegion: Navigation): Boolean {
         scope.launch {
             val moveTo = when (navigationRegion) {
                 Navigation.MENU -> {
@@ -165,11 +165,20 @@ class ReaderMenuViewModel @Inject constructor(
                     Direction.Left -> MoveTo.Next
                     else -> MoveTo.Previous
                 }
+                Navigation.DOWN -> when (readerModeSettings.direction.value) {
+                    Direction.Up -> MoveTo.Previous
+                    else -> MoveTo.Next
+                }
+                Navigation.UP -> when (readerModeSettings.direction.value) {
+                    Direction.Up -> MoveTo.Next
+                    else -> MoveTo.Previous
+                }
             }
             if (moveTo != null) {
                 _pageEmitter.emit(PageMove.Direction(moveTo))
             }
         }
+        return true
     }
 
     fun navigate(page: Int) {

presentation/src/commonMain/kotlin/ca/gosyer/jui/ui/reader/model/Navigation.kt

@@ -12,4 +12,6 @@ sealed class Navigation(val name: String) {
     object NEXT : Navigation("Next")
     object LEFT : Navigation("Left")
     object RIGHT : Navigation("Right")
+    object UP : Navigation("Up")
+    object DOWN : Navigation("Down")
 }

presentation/src/desktopMain/kotlin/ca/gosyer/jui/ui/reader/DesktopReaderMenu.kt

@@ -13,24 +13,15 @@ import androidx.compose.runtime.currentCompositionLocalContext
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
-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 androidx.compose.ui.res.painterResource
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.WindowPosition
 import androidx.compose.ui.window.rememberWindowState
 import ca.gosyer.jui.presentation.build.BuildKonfig
-import ca.gosyer.jui.ui.base.model.StableHolder
 import ca.gosyer.jui.ui.util.lang.launchApplication
 import kotlinx.coroutines.DelicateCoroutinesApi
-import kotlinx.coroutines.flow.MutableSharedFlow
-import kotlinx.coroutines.flow.asSharedFlow
-import kotlinx.coroutines.launch
 
 actual class ReaderLauncher {
 
@@ -50,9 +41,6 @@ actual class ReaderLauncher {
         DisposableEffect(isOpen) {
             isOpen?.let { (chapterIndex, mangaId) ->
                 launchApplication {
-                    val scope = rememberCoroutineScope()
-                    val hotkeyFlow = remember { MutableSharedFlow<KeyEvent>() }
-                    val hotkeyFlowHolder = remember { StableHolder(hotkeyFlow.asSharedFlow()) }
                     val windowState = rememberWindowState(
                         position = WindowPosition.Aligned(Alignment.Center)
                     )
@@ -63,18 +51,10 @@ actual class ReaderLauncher {
                             title = "${BuildKonfig.NAME} - Reader",
                             icon = icon,
                             state = windowState,
-                            onKeyEvent = {
-                                if (it.type != KeyEventType.KeyDown) return@Window false
-                                scope.launch {
-                                    hotkeyFlow.emit(it)
-                                }
-                                it.key in supportedKeyList
-                            }
                         ) {
                             ReaderMenu(
                                 chapterIndex = chapterIndex,
                                 mangaId = mangaId,
-                                hotkeyFlowHolder = hotkeyFlowHolder,
                                 onCloseRequest = ::exitApplication
                             )
                         }

presentation/src/iosMain/kotlin/ca/gosyer/jui/ui/reader/IosReaderMenu.kt

@@ -8,12 +8,10 @@ package ca.gosyer.jui.ui.reader
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
-import ca.gosyer.jui.ui.base.model.StableHolder
 import cafe.adriel.voyager.core.screen.Screen
 import cafe.adriel.voyager.navigator.LocalNavigator
 import cafe.adriel.voyager.navigator.Navigator
 import cafe.adriel.voyager.navigator.currentOrThrow
-import kotlinx.coroutines.flow.MutableSharedFlow
 
 class ReaderScreen(val chapterIndex: Int, val mangaId: Long) : Screen {
 
@@ -23,7 +21,6 @@ class ReaderScreen(val chapterIndex: Int, val mangaId: Long) : Screen {
         ReaderMenu(
             chapterIndex,
             mangaId,
-            remember { StableHolder(MutableSharedFlow()) },
             navigator::pop
         )
     }