Scroll up/down when tapping top/bottom thirds in vertical reading modes (closes #3363)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewer.kt

@@ -80,11 +80,20 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
             }
         })
         pager.tapListener = { event ->
-            val positionX = event.x
-            when {
-                positionX < pager.width * 0.33f && config.tappingEnabled -> moveLeft()
-                positionX > pager.width * 0.66f && config.tappingEnabled -> moveRight()
-                else -> activity.toggleMenu()
+            if (this is VerticalPagerViewer) {
+                val positionY = event.y
+                when {
+                    positionY < pager.height * 0.33f && config.tappingEnabled -> moveLeft()
+                    positionY > pager.height * 0.66f && config.tappingEnabled -> moveRight()
+                    else -> activity.toggleMenu()
+                }
+            } else {
+                val positionX = event.x
+                when {
+                    positionX < pager.width * 0.33f && config.tappingEnabled -> moveLeft()
+                    positionX > pager.width * 0.66f && config.tappingEnabled -> moveRight()
+                    else -> activity.toggleMenu()
+                }
             }
         }
         pager.longTapListener = f@{

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewerAdapter.kt

@@ -24,6 +24,7 @@ class PagerViewerAdapter(private val viewer: PagerViewer) : ViewPagerAdapter() {
         private set
 
     var currentChapter: ReaderChapter? = null
+
     /**
      * Updates this adapter with the given [chapters]. It handles setting a few pages of the
      * next/previous chapter to allow seamless transitions and inverting the pages if the viewer

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

@@ -93,13 +93,10 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
             }
         })
         recycler.tapListener = { event ->
-            val positionX = event.rawX
             val positionY = event.rawY
             when {
-                positionY < recycler.height * 0.25 && config.tappingEnabled -> scrollUp()
-                positionY > recycler.height * 0.75 && config.tappingEnabled -> scrollDown()
-                positionX < recycler.width * 0.33 && config.tappingEnabled -> scrollUp()
-                positionX > recycler.width * 0.66 && config.tappingEnabled -> scrollDown()
+                positionY < recycler.height * 0.33f && config.tappingEnabled -> scrollUp()
+                positionY > recycler.height * 0.66f && config.tappingEnabled -> scrollDown()
                 else -> activity.toggleMenu()
             }
         }