MainPlayerUi: separate enter/exit fullscreen methods

Most usages of `toggleFullscreen` are clear about whether they want to
enter or exit fullscreen, so let’s split the setup into two functions
for easier debugging.

The two remaining uses of `toggleFullscreen` *should* really toggle,
but I’m not 100% sure.

Also rename `onScreenRotationButtonClicked` to
`onFullscreenToggleButtonClicked`, since we renamed the button id
earlier.

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.kt

@@ -991,7 +991,7 @@ class VideoDetailFragment :
             // restored (i.e. bottomSheetState) to STATE_EXPANDED.
             updateBottomSheetState(BottomSheetBehavior.STATE_EXPANDED)
             // toggle landscape in order to open directly in fullscreen
-            onScreenRotationButtonClicked()
+            onFullscreenToggleButtonClicked()
         }
 
         if (PreferenceManager.getDefaultSharedPreferences(activity)
@@ -1726,7 +1726,7 @@ class VideoDetailFragment :
         tryAddVideoPlayerView()
     }
 
-    override fun onScreenRotationButtonClicked() {
+    override fun onFullscreenToggleButtonClicked() {
         // In tablet user experience will be better if screen will not be rotated
         // from landscape to portrait every time.
         // Just turn on fullscreen mode in landscape orientation

app/src/main/java/org/schabi/newpipe/player/event/PlayerServiceEventListener.java

@@ -10,7 +10,7 @@ public interface PlayerServiceEventListener extends PlayerEventListener {
 
     void onFullscreenStateChanged(boolean fullscreen);
 
-    void onScreenRotationButtonClicked();
+    void onFullscreenToggleButtonClicked();
 
     void onMoreOptionsLongClicked();
 

app/src/main/java/org/schabi/newpipe/player/helper/PlayerHolder.kt

@@ -243,8 +243,8 @@ object PlayerHolder {
             listener?.onFullscreenStateChanged(fullscreen)
         }
 
-        override fun onScreenRotationButtonClicked() {
-            listener?.onScreenRotationButtonClicked()
+        override fun onFullscreenToggleButtonClicked() {
+            listener?.onFullscreenToggleButtonClicked()
         }
 
         override fun onMoreOptionsLongClicked() {

app/src/main/java/org/schabi/newpipe/player/ui/MainPlayerUi.java

@@ -122,7 +122,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
                 && DeviceUtils.isTablet(player.getService())
                 && PlayerHelper.globalScreenOrientationLocked(player.getService())) {
             player.getFragmentListener().ifPresent(
-                    PlayerServiceEventListener::onScreenRotationButtonClicked);
+                    PlayerServiceEventListener::onFullscreenToggleButtonClicked);
         }
     }
 
@@ -159,7 +159,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
             // orientation a screen orientation can be changed automatically
             if (!isVerticalVideo || (isLandscape() && globalScreenOrientationLocked(context))) {
                 player.getFragmentListener()
-                        .ifPresent(PlayerServiceEventListener::onScreenRotationButtonClicked);
+                        .ifPresent(PlayerServiceEventListener::onFullscreenToggleButtonClicked);
             } else {
                 toggleFullscreen();
             }
@@ -233,7 +233,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
 
         // Exit from fullscreen when user closes the player via notification
         if (isFullscreen) {
-            toggleFullscreen();
+            exitFullscreen();
         }
 
         removeViewFromParent();
@@ -414,7 +414,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
     public void onCompleted() {
         super.onCompleted();
         if (isFullscreen) {
-            toggleFullscreen();
+            exitFullscreen();
         }
     }
     //endregion
@@ -905,7 +905,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
                 && !DeviceUtils.isTablet(context)) {
             // set correct orientation
             player.getFragmentListener().ifPresent(
-                    PlayerServiceEventListener::onScreenRotationButtonClicked);
+                    PlayerServiceEventListener::onFullscreenToggleButtonClicked);
         }
 
         setupScreenRotationButton();
@@ -915,28 +915,54 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
         if (DEBUG) {
             Log.d(TAG, "toggleFullscreen() called");
         }
+
+        if (isFullscreen) {
+            exitFullscreen();
+        } else {
+            enterFullscreen();
+        }
+
+    }
+
+    public void enterFullscreen() {
+        if (DEBUG) {
+            Log.d(TAG, "enterFullscreen() called");
+        }
         final PlayerServiceEventListener fragmentListener = player.getFragmentListener()
                 .orElse(null);
         if (fragmentListener == null || player.exoPlayerIsNull()) {
             return;
         }
+        isFullscreen = true;
+        // Android needs tens milliseconds to send new insets but a user is able to see
+        // how controls changes it's position from `0` to `nav bar height` padding.
+        // So just hide the controls to hide this visual inconsistency
+        hideControls(0, 0);
+        fragmentListener.onFullscreenStateChanged(true);
+        setupFullscreenButtons(true);
+    }
 
-        isFullscreen = !isFullscreen;
-        if (isFullscreen) {
-            // Android needs tens milliseconds to send new insets but a user is able to see
-            // how controls changes it's position from `0` to `nav bar height` padding.
-            // So just hide the controls to hide this visual inconsistency
-            hideControls(0, 0);
-        } else {
-            // Apply window insets because Android will not do it when orientation changes
-            // from landscape to portrait (open vertical video to reproduce)
-            binding.playbackControlRoot.setPadding(0, 0, 0, 0);
+    public void exitFullscreen() {
+        if (DEBUG) {
+            Log.d(TAG, "exitFullscreen() called");
         }
-        fragmentListener.onFullscreenStateChanged(isFullscreen);
+        final PlayerServiceEventListener fragmentListener = player.getFragmentListener()
+                .orElse(null);
+        if (fragmentListener == null || player.exoPlayerIsNull()) {
+            return;
+        }
+        isFullscreen = false;
+        // Apply window insets because Android will not do it when orientation changes
+        // from landscape to portrait (open vertical video to reproduce)
+        binding.playbackControlRoot.setPadding(0, 0, 0, 0);
+        fragmentListener.onFullscreenStateChanged(false);
+        setupFullscreenButtons(false);
+    }
 
-        binding.titleTextView.setVisibility(isFullscreen ? View.VISIBLE : View.GONE);
-        binding.channelTextView.setVisibility(isFullscreen ? View.VISIBLE : View.GONE);
-        binding.playerCloseButton.setVisibility(isFullscreen ? View.GONE : View.VISIBLE);
+    private void setupFullscreenButtons(final boolean fullscreen) {
+        binding.titleTextView.setVisibility(fullscreen ? View.VISIBLE : View.GONE);
+        binding.channelTextView.setVisibility(fullscreen ? View.VISIBLE : View.GONE);
+        binding.playerCloseButton.setVisibility(fullscreen ? View.GONE : View.VISIBLE);
         setupScreenRotationButton();
     }
 
@@ -951,7 +977,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
         if (videoInLandscapeButNotInFullscreen
                 && notPaused
                 && !DeviceUtils.isTablet(context)) {
-            toggleFullscreen();
+            enterFullscreen();
         }
     }
     //endregion