Add option to reader sheet

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

@@ -28,6 +28,7 @@ import kotlinx.android.synthetic.main.reader_settings_sheet.pager_prefs_group
 import kotlinx.android.synthetic.main.reader_settings_sheet.rotation_mode
 import kotlinx.android.synthetic.main.reader_settings_sheet.scale_type
 import kotlinx.android.synthetic.main.reader_settings_sheet.show_page_number
+import kotlinx.android.synthetic.main.reader_settings_sheet.tapping_inverted
 import kotlinx.android.synthetic.main.reader_settings_sheet.true_color
 import kotlinx.android.synthetic.main.reader_settings_sheet.viewer
 import kotlinx.android.synthetic.main.reader_settings_sheet.webtoon_prefs_group
@@ -57,6 +58,7 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : BottomSheetDia
         super.onCreate(savedInstanceState)
 
         initGeneralPreferences()
+        initNavigationPreferences()
 
         when (activity.viewer) {
             is PagerViewer -> initPagerPreferences()
@@ -119,6 +121,13 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : BottomSheetDia
         webtoon_side_padding.bindToIntPreference(preferences.webtoonSidePadding(), R.array.webtoon_side_padding_values)
     }
 
+    /**
+     * Init the preferences for navigation.
+     */
+    private fun initNavigationPreferences() {
+        tapping_inverted.bindToPreference(preferences.readWithTappingInverted())
+    }
+
     /**
      * Binds a checkbox or switch view with a boolean preference.
      */
@@ -137,6 +146,19 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : BottomSheetDia
         setSelection(pref.get() - offset, false)
     }
 
+    /**
+     * Binds a spinner to an enum preference.
+     */
+    private inline fun <reified T : Enum<T>> Spinner.bindToPreference(pref: Preference<T>) {
+        val enumConstants = T::class.java.enumConstants
+
+        onItemSelectedListener = IgnoreFirstSpinnerListener { position ->
+            enumConstants?.get(position)?.let { pref.set(it) }
+        }
+
+        enumConstants?.indexOf(pref.get())?.let { setSelection(it, false) }
+    }
+
     /**
      * Binds a spinner to an int preference. The position of the spinner item must
      * correlate with the [intValues] resource item (in arrays.xml), which is a <string-array>

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

@@ -15,10 +15,10 @@ import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 import eu.kanade.tachiyomi.ui.reader.viewer.BaseViewer
 import eu.kanade.tachiyomi.util.view.gone
 import eu.kanade.tachiyomi.util.view.visible
-import rx.subscriptions.CompositeSubscription
-import timber.log.Timber
 import kotlin.math.max
 import kotlin.math.min
+import rx.subscriptions.CompositeSubscription
+import timber.log.Timber
 
 /**
  * Implementation of a [BaseViewer] to display pages with a [RecyclerView].