Support reverse physical key controls in reader

app/src/main/kotlin/com/hippo/ehviewer/Settings.kt

@@ -195,6 +195,7 @@ object Settings : DataStorePreferences(null) {
     val keepScreenOn = boolPref("pref_keep_screen_on_key", true)
     val readerLongTapAction = boolPref("reader_long_tap", true)
     val pageTransitions = boolPref("pref_enable_transitions_key", true)
+    val readerReverseControls = boolPref("reader_volume_keys_inverted", false)
     val grayScale = boolPref("pref_grayscale", false)
     val invertedColors = boolPref("pref_inverted_colors", false)
     val readerWebtoonNav = intPref("reader_navigation_mode_webtoon", 0)

app/src/main/kotlin/com/hippo/ehviewer/ui/reader/KeyEventHandler.kt

@@ -9,13 +9,14 @@ import androidx.compose.ui.input.key.type
 
 fun Modifier.keyEventHandler(
     enabled: () -> Boolean,
+    reverse: () -> Boolean,
     movePrevious: () -> Unit,
     moveNext: () -> Unit,
 ) = onPreviewKeyEvent {
     if (enabled() && it.type == KeyEventType.KeyDown) {
         when (it.key) {
-            Key.DirectionUp, Key.PageUp, Key.VolumeUp -> movePrevious()
-            Key.DirectionDown, Key.PageDown, Key.VolumeDown -> moveNext()
+            Key.DirectionUp, Key.PageUp, Key.VolumeUp -> if (reverse()) moveNext() else movePrevious()
+            Key.DirectionDown, Key.PageDown, Key.VolumeDown -> if (reverse()) movePrevious() else moveNext()
             else -> return@onPreviewKeyEvent false
         }
         true

app/src/main/kotlin/com/hippo/ehviewer/ui/reader/ReaderGeneralSetting.kt

@@ -63,4 +63,8 @@ fun ReaderGeneralSetting() = Column(modifier = Modifier.verticalScroll(rememberS
         title = stringResource(id = R.string.pref_page_transitions),
         field = Settings.pageTransitions.asMutableState(),
     )
+    SwitchChoice(
+        title = stringResource(id = R.string.settings_read_reverse_controls),
+        field = Settings.readerReverseControls.asMutableState(),
+    )
 }

app/src/main/kotlin/com/hippo/ehviewer/ui/reader/ReaderScreen.kt

@@ -188,6 +188,7 @@ fun AnimatedVisibilityScope.ReaderScreen(pageLoader: PageLoader, info: BaseGalle
     }
     val showSeekbar by Settings.showReaderSeekbar.collectAsState()
     val readingMode by Settings.readingMode.collectAsState { ReadingModeType.fromPreference(it) }
+    val reverseControls by Settings.readerReverseControls.collectAsState()
     val fullscreen by Settings.fullscreen.collectAsState()
     val cutoutShort by Settings.cutoutShort.collectAsState()
     val uiController = rememberSystemUiController()
@@ -207,6 +208,7 @@ fun AnimatedVisibilityScope.ReaderScreen(pageLoader: PageLoader, info: BaseGalle
     Box(
         Modifier.keyEventHandler(
             enabled = { !appbarVisible },
+            reverse = { reverseControls },
             movePrevious = {
                 launch {
                     if (isWebtoon) lazyListState.scrollUp() else pagerState.moveToPrevious()

app/src/main/res/values-zh-rCN/strings.xml

@@ -312,6 +312,7 @@
     <string name="settings_eh_tag_translations_source_url">https://github.com/EhTagTranslation/Editor/wiki</string>
     <string name="settings_eh_filter">屏蔽列表</string>
     <string name="settings_eh_filter_summary">根据标题、上传者、标签、评论者屏蔽画廊或评论</string>
+    <string name="settings_read_reverse_controls">反转物理按键控制</string>
     <string name="settings_block_extraneous_ads">[实验性] 屏蔽外部广告</string>
     <string name="settings_ads_placeholder">[可选] 选择替换外部广告的图片</string>
     <string name="settings_download">下载</string>

app/src/main/res/values/strings.xml

@@ -328,6 +328,7 @@
     <string name="settings_eh_tag_translations_source_url">https://placeholder</string>
     <string name="settings_eh_filter">Blockers</string>
     <string name="settings_eh_filter_summary">Block gallery or comment by title, uploader, tags and commenter</string>
+    <string name="settings_read_reverse_controls">Reverse physical key controls</string>
     <string name="settings_block_extraneous_ads">[Experimental] Block extraneous ads</string>
     <string name="settings_ads_placeholder">[Optional] Pick placeholder to replace ads</string>
     <string name="settings_download">Download</string>