Reading mode snackbar

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -21,6 +21,8 @@ object PreferenceKeys {
 
     const val showPageNumber = "pref_show_page_number_key"
 
+    const val showReadingMode = "pref_show_reading_mode"
+
     const val trueColor = "pref_true_color_key"
 
     const val fullscreen = "fullscreen"

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -83,6 +83,8 @@ class PreferencesHelper(val context: Context) {
 
     fun showPageNumber() = flowPrefs.getBoolean(Keys.showPageNumber, true)
 
+    fun showReadingMode() = prefs.getBoolean(Keys.showReadingMode, true)
+
     fun trueColor() = flowPrefs.getBoolean(Keys.trueColor, false)
 
     fun fullscreen() = flowPrefs.getBoolean(Keys.fullscreen, true)

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

@@ -22,6 +22,7 @@ import android.view.animation.AnimationUtils
 import android.widget.SeekBar
 import androidx.core.view.ViewCompat
 import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
+import com.google.android.material.snackbar.Snackbar
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Chapter
 import eu.kanade.tachiyomi.data.database.models.Manga
@@ -42,7 +43,6 @@ import eu.kanade.tachiyomi.ui.reader.viewer.pager.L2RPagerViewer
 import eu.kanade.tachiyomi.ui.reader.viewer.pager.R2LPagerViewer
 import eu.kanade.tachiyomi.ui.reader.viewer.pager.VerticalPagerViewer
 import eu.kanade.tachiyomi.ui.reader.viewer.webtoon.WebtoonViewer
-import eu.kanade.tachiyomi.util.lang.plusAssign
 import eu.kanade.tachiyomi.util.storage.getUriCompat
 import eu.kanade.tachiyomi.util.system.GLUtil
 import eu.kanade.tachiyomi.util.system.toast
@@ -51,6 +51,7 @@ import eu.kanade.tachiyomi.util.view.gone
 import eu.kanade.tachiyomi.util.view.hideBar
 import eu.kanade.tachiyomi.util.view.isDefaultBar
 import eu.kanade.tachiyomi.util.view.showBar
+import eu.kanade.tachiyomi.util.view.snack
 import eu.kanade.tachiyomi.util.view.visible
 import eu.kanade.tachiyomi.widget.SimpleAnimationListener
 import eu.kanade.tachiyomi.widget.SimpleSeekBarListener
@@ -403,6 +404,10 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
         viewer = newViewer
         binding.viewerContainer.addView(newViewer.getView())
 
+        if (preferences.showReadingMode()) {
+            showReadingModeSnackbar(presenter.getMangaViewer())
+        }
+
         binding.toolbar.title = manga.title
 
         binding.pageSeekbar.isRTL = newViewer is R2LPagerViewer
@@ -411,6 +416,11 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
         binding.pleaseWait.startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_in_long))
     }
 
+    private fun showReadingModeSnackbar(mode: Int) {
+        val strings = resources.getStringArray(R.array.viewers_selector)
+        binding.root.snack(strings[mode], Snackbar.LENGTH_SHORT)
+    }
+
     /**
      * Called from the presenter whenever a new [viewerChapters] have been set. It delegates the
      * method to the current viewer, but also set the subtitle on the toolbar.

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

@@ -83,6 +83,12 @@ class SettingsReaderController : SettingsController() {
                 titleRes = R.string.pref_show_page_number
                 defaultValue = true
             }
+            switchPreference {
+                key = Keys.showReadingMode
+                titleRes = R.string.pref_show_reading_mode
+                summaryRes = R.string.pref_show_reading_mode_summary
+                defaultValue = true
+            }
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                 switchPreference {
                     key = Keys.trueColor

app/src/main/java/eu/kanade/tachiyomi/util/view/ViewExtensions.kt

@@ -33,7 +33,7 @@ fun View.getCoordinates() = Point((left + right) / 2, (top + bottom) / 2)
  * @param length the duration of the snack.
  * @param f a function to execute in the snack, allowing for example to define a custom action.
  */
-inline fun View.snack(message: String, length: Int = Snackbar.LENGTH_LONG, f: Snackbar.() -> Unit): Snackbar {
+inline fun View.snack(message: String, length: Int = Snackbar.LENGTH_LONG, f: Snackbar.() -> Unit = {}): Snackbar {
     val snack = Snackbar.make(this, message, length)
     val textView: TextView = snack.view.findViewById(com.google.android.material.R.id.snackbar_text)
     textView.setTextColor(Color.WHITE)

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

@@ -233,6 +233,8 @@
     <string name="pref_page_transitions">Animate page transitions</string>
     <string name="pref_double_tap_anim_speed">Double tap animation speed</string>
     <string name="pref_show_page_number">Show page number</string>
+    <string name="pref_show_reading_mode">Show reading mode</string>
+    <string name="pref_show_reading_mode_summary">Briefly show current mode when reader is opened</string>
     <string name="pref_true_color">32-bit color</string>
     <string name="pref_true_color_summary">Reduces banding, but impacts performance</string>
     <string name="pref_crop_borders">Crop borders</string>