Refactor webtoon zoom option

app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt

@@ -106,6 +106,12 @@ class ReaderViewModel @AssistedInject constructor(
 		valueProducer = { isReaderBarEnabled },
 	)
 
+	val isWebtoonZoomEnabled = settings.observeAsLiveData(
+		context = viewModelScope.coroutineContext + Dispatchers.Default,
+		key = AppSettings.KEY_WEBTOON_ZOOM,
+		valueProducer = { isWebtoonZoomEnable },
+	)
+
 	val readerSettings = ReaderSettings(
 		parentScope = viewModelScope,
 		settings = settings,

app/src/main/java/org/koitharu/kotatsu/reader/ui/config/ReaderSettings.kt

@@ -2,9 +2,13 @@ package org.koitharu.kotatsu.reader.ui.config
 
 import android.content.SharedPreferences
 import androidx.lifecycle.MediatorLiveData
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.FlowCollector
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.koitharu.kotatsu.core.model.ZoomMode
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.reader.domain.ReaderColorFilter
@@ -27,9 +31,6 @@ class ReaderSettings(
 	val isPagesNumbersEnabled: Boolean
 		get() = settings.isPagesNumbersEnabled
 
-	val isWebtoonZoomEnable: Boolean
-		get() = settings.isWebtoonZoomEnable
-
 	override fun onInactive() {
 		super.onInactive()
 		settings.unsubscribe(internalObserver)

app/src/main/java/org/koitharu/kotatsu/reader/ui/pager/webtoon/WebtoonReaderFragment.kt

@@ -36,7 +36,9 @@ class WebtoonReaderFragment : BaseReader<FragmentReaderWebtoonBinding>() {
 			addOnPageScrollListener(PageScrollListener())
 		}
 
-		viewModel.readerSettings.observe(viewLifecycleOwner) { binding.frame.isZoomEnable = it.isWebtoonZoomEnable }
+		viewModel.isWebtoonZoomEnabled.observe(viewLifecycleOwner) {
+			binding.frame.isZoomEnable = it
+		}
 	}
 
 	override fun onDestroyView() {

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

@@ -391,4 +391,5 @@
 	<string name="error_no_space_left">No space left on device</string>
 	<string name="reader_slider">Show page switching slider</string>
 	<string name="webtoon_zoom">Webtoon zoom</string>
+	<string name="webtoon_zoom_summary">Allow zoom in/zoom out gesture in webtoon mode (beta)</string>
 </resources>