Add tap to move by page for continues vertical reader

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

@@ -280,4 +280,6 @@ object PreferenceKeys {
     const val startReadingButton = "start_reading_button"
 
     const val groupLibraryBy = "group_library_by"
+
+    const val continuousVerticalTappingByPage = "continuous_vertical_tapping_by_page"
 }

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

@@ -385,4 +385,6 @@ class PreferencesHelper(val context: Context) {
     fun startReadingButton() = flowPrefs.getBoolean(Keys.startReadingButton, true)
 
     fun groupLibraryBy() = flowPrefs.getInt(Keys.groupLibraryBy, 0)
+
+    fun continuousVerticalTappingByPage() = flowPrefs.getBoolean(Keys.continuousVerticalTappingByPage, false)
 }

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

@@ -52,7 +52,6 @@ import eu.kanade.tachiyomi.ui.reader.viewer.pager.PagerViewer
 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.hasDisplayCutout
@@ -640,7 +639,7 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
             RIGHT_TO_LEFT -> R2LPagerViewer(this)
             VERTICAL -> VerticalPagerViewer(this)
             WEBTOON -> WebtoonViewer(this)
-            VERTICAL_PLUS -> WebtoonViewer(this, isContinuous = false)
+            VERTICAL_PLUS -> WebtoonViewer(this, isContinuous = false /* SY --> */, tapByPage = preferences.continuousVerticalTappingByPage().get() /* SY <-- */)
             else -> L2RPagerViewer(this)
         }
 

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

@@ -23,7 +23,7 @@ import kotlin.math.min
 /**
  * Implementation of a [BaseViewer] to display pages with a [RecyclerView].
  */
-class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = true) : BaseViewer {
+class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = true, private val tapByPage: Boolean = false) : BaseViewer {
 
     /**
      * Recycler view used by this viewer.
@@ -266,6 +266,27 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
      * Scrolls down by [scrollDistance].
      */
     /* [EXH] private */ fun scrollDown() {
+        // SY -->
+        if (!isContinuous && tapByPage) {
+            val currentPage = currentPage
+            if (currentPage is ReaderPage) {
+                val position = adapter.items.indexOf(currentPage)
+                val nextItem = adapter.items.getOrNull(position + 1)
+                if (nextItem is ReaderPage) {
+                    if (config.usePageTransitions) {
+                        recycler.smoothScrollToPosition(position + 1)
+                    } else {
+                        recycler.scrollToPosition(position + 1)
+                    }
+                    return
+                }
+            }
+        }
+        scrollDownBy()
+    }
+
+    private fun scrollDownBy() {
+        // SY <--
         if (config.usePageTransitions) {
             recycler.smoothScrollBy(0, scrollDistance)
         } else {

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

@@ -301,6 +301,19 @@ class SettingsReaderController : SettingsController() {
             }
         }
 
+        // SY -->
+        preferenceCategory {
+            titleRes = R.string.vertical_plus_viewer
+
+            switchPreference {
+                key = Keys.continuousVerticalTappingByPage
+                titleRes = R.string.tap_scroll_page
+                summaryRes = R.string.tap_scroll_page_summary
+                defaultValue = false
+            }
+        }
+        // SY <--
+
         preferenceCategory {
             titleRes = R.string.pref_reader_navigation
 

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

@@ -180,6 +180,8 @@
     <string name="enable_zoom_out">Enable zoom out</string>
     <string name="smart_based_on_page">Smart (based on page)</string>
     <string name="smart_based_on_page_and_theme">Smart (based on page and theme)</string>
+    <string name="tap_scroll_page">Tap scroll by page</string>
+    <string name="tap_scroll_page_summary">Tapping will scroll by page instead of screen size when this option is enabled</string>
 
     <!-- Reader -->
     <!-- Reader Actions -->