Double tap zoom toggle (#9384)

* Double tap zoom toggle

Implements a toggle that allows users to disable double tap zoom including QuickScaling for webtoons. Partially resolves #4145

* Update i18n/src/main/res/values/strings.xml

---------

Co-authored-by: arkon <arkon@users.noreply.github.com>

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsReaderScreen.kt

@@ -317,6 +317,11 @@ object SettingsReaderScreen : SearchableSettings {
                     subtitle = stringResource(R.string.split_tall_images_summary),
                     enabled = !isReleaseBuildType, // TODO: Show in release build when the feature is stable
                 ),
+                Preference.PreferenceItem.SwitchPreference(
+                    pref = readerPreferences.webtoonDoubleTapZoomEnabled(),
+                    title = stringResource(R.string.pref_double_tap_zoom),
+                    enabled = true,
+                ),
             ),
         )
     }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/ReaderPreferences.kt

@@ -34,6 +34,8 @@ class ReaderPreferences(
     // TODO: Enable in release build when the feature is stable
     fun longStripSplitWebtoon() = preferenceStore.getBoolean("pref_long_strip_split_webtoon", !isReleaseBuildType)
 
+    fun webtoonDoubleTapZoomEnabled() = preferenceStore.getBoolean("pref_enable_double_tap_zoom_webtoon", true)
+
     fun imageScaleType() = preferenceStore.getInt("pref_image_scale_type_key", 1)
 
     fun zoomStart() = preferenceStore.getInt("pref_zoom_start_key", 1)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/ReaderReadingModeSettings.kt

@@ -140,5 +140,7 @@ class ReaderReadingModeSettings @JvmOverloads constructor(context: Context, attr
 
         binding.webtoonPrefsGroup.longStripSplit.isVisible = !isReleaseBuildType
         binding.webtoonPrefsGroup.longStripSplit.bindToPreference(readerPreferences.longStripSplitWebtoon())
+
+        binding.webtoonPrefsGroup.doubleTapZoom.bindToPreference(readerPreferences.webtoonDoubleTapZoomEnabled())
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt

@@ -37,6 +37,11 @@ class WebtoonConfig(
 
     var longStripSplitChangedListener: ((Boolean) -> Unit)? = null
 
+    var doubleTapZoom = true
+        private set
+
+    var doubleTapZoomChangedListener: ((Boolean) -> Unit)? = null
+
     val theme = readerPreferences.readerTheme().get()
 
     init {
@@ -71,6 +76,12 @@ class WebtoonConfig(
                 },
             )
 
+        readerPreferences.webtoonDoubleTapZoomEnabled()
+            .register(
+                { doubleTapZoom = it },
+                { doubleTapZoomChangedListener?.invoke(it) },
+            )
+
         readerPreferences.readerTheme().changes()
             .drop(1)
             .distinctUntilChanged()

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonFrame.kt

@@ -25,6 +25,13 @@ class WebtoonFrame(context: Context) : FrameLayout(context) {
      */
     private val flingDetector = GestureDetector(context, FlingListener())
 
+    var doubleTapZoom = true
+        set(value) {
+            field = value
+            recycler?.doubleTapZoom = value
+            scaleDetector.isQuickScaleEnabled = value
+        }
+
     /**
      * Recycler view added in this frame.
      */

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonRecyclerView.kt

@@ -37,6 +37,8 @@ class WebtoonRecyclerView @JvmOverloads constructor(
     private val listener = GestureListener()
     private val detector = Detector()
 
+    var doubleTapZoom = true
+
     var tapListener: ((MotionEvent) -> Unit)? = null
     var longTapListener: ((MotionEvent) -> Boolean)? = null
 
@@ -209,7 +211,7 @@ class WebtoonRecyclerView @JvmOverloads constructor(
         }
 
         fun onDoubleTapConfirmed(ev: MotionEvent) {
-            if (!isZooming) {
+            if (!isZooming && doubleTapZoom) {
                 if (scaleX != DEFAULT_RATE) {
                     zoom(currentScale, DEFAULT_RATE, x, 0f, y, 0f)
                 } else {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonViewer.kt

@@ -142,6 +142,10 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
             ActivityCompat.recreate(activity)
         }
 
+        config.doubleTapZoomChangedListener = {
+            frame.doubleTapZoom = it
+        }
+
         config.navigationModeChangedListener = {
             val showOnStart = config.navigationOverlayOnStart || config.forceNavigationOverlay
             activity.binding.navigationOverlay.setNavigation(config.navigator, showOnStart)