Register to Window OnFullscreen changes instead of using GeckoSession.addContextListener

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/WindowWidget.java

@@ -140,6 +140,7 @@ public interface WindowListener {
         default void onFocusRequest(@NonNull WindowWidget aWindow) {}
         default void onBorderChanged(@NonNull WindowWidget aWindow) {}
         default void onSessionChanged(@NonNull Session aOldSession, @NonNull Session aSession) {}
+        default void onFullScreen(@NonNull WindowWidget aWindow, boolean aFullScreen) {}
         default void onVideoAvailabilityChanged(@NonNull WindowWidget aWindow) {}
     }
 
@@ -886,7 +887,12 @@ public boolean isResizing() {
     }
 
     public void setIsFullScreen(boolean isFullScreen) {
-        mIsFullScreen = isFullScreen;
+        if (isFullScreen != mIsFullScreen) {
+            mIsFullScreen = isFullScreen;
+            for (WindowListener listener: mListeners) {
+                listener.onFullScreen(this, isFullScreen);
+            }
+        }
     }
 
     public boolean isFullScreen() {

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/Windows.java

@@ -44,8 +44,7 @@
 import mozilla.components.concept.sync.TabData;
 
 public class Windows implements TrayListener, TopBarWidget.Delegate, TitleBarWidget.Delegate,
-        GeckoSession.ContentDelegate, WindowWidget.WindowListener, TabsWidget.TabDelegate,
-        Services.TabReceivedDelegate {
+        WindowWidget.WindowListener, TabsWidget.TabDelegate, Services.TabReceivedDelegate {
 
     private static final String LOGTAG = SystemUtils.createLogtag(Windows.class);
 
@@ -208,7 +207,7 @@ public WindowWidget addWindow() {
 
         if (mFullscreenWindow != null) {
             mFullscreenWindow.getSession().exitFullScreen();
-            onFullScreen(mFullscreenWindow.getSession().getGeckoSession(), false);
+            onFullScreen(mFullscreenWindow, false);
         }
 
         WindowWidget frontWindow = getFrontWindow();
@@ -652,7 +651,6 @@ private void removeWindow(@NonNull WindowWidget aWindow) {
         aWindow.removeWindowListener(this);
         aWindow.getTitleBar().setVisible(false);
         aWindow.getTitleBar().setDelegate((TitleBarWidget.Delegate) null);
-        aWindow.getSession().removeContentListener(this);
         aWindow.close();
         updateMaxWindowScales();
         updateCurvedMode(true);
@@ -851,7 +849,6 @@ private WindowWidget createWindow(@Nullable Session aSession) {
         getCurrentWindows().add(window);
         window.getTopBar().setDelegate(this);
         window.getTitleBar().setDelegate(this);
-        window.getSession().addContentListener(this);
 
         if (mPrivateMode) {
             TelemetryWrapper.openWindowsEvent(mPrivateWindows.size() - 1, mPrivateWindows.size(), true);
@@ -1040,36 +1037,6 @@ private void setFullScreenSize(WindowWidget aWindow) {
         }
     }
 
-    // Content delegate
-    @Override
-    public void onFullScreen(GeckoSession session, boolean aFullScreen) {
-        WindowWidget window = getWindowWithSession(session);
-        if (window == null) {
-            return;
-        }
-
-        if (aFullScreen) {
-            mFullscreenWindow = window;
-            window.saveBeforeFullscreenPlacement();
-            setFullScreenSize(window);
-            placeWindow(window, WindowPlacement.FRONT);
-            focusWindow(window);
-            for (WindowWidget win: getCurrentWindows()) {
-                setWindowVisible(win, win == mFullscreenWindow);
-            }
-            updateMaxWindowScales();
-            updateViews();
-        } else if (mFullscreenWindow != null) {
-            window.restoreBeforeFullscreenPlacement();
-            mFullscreenWindow = null;
-            for (WindowWidget win : getCurrentWindows()) {
-                setWindowVisible(win, true);
-            }
-            updateMaxWindowScales();
-            updateViews();
-        }
-    }
-
     @Nullable
     private WindowWidget getWindowWithSession(GeckoSession aSession) {
         for (WindowWidget window: getCurrentWindows()) {
@@ -1110,6 +1077,30 @@ public void onVideoAvailabilityChanged(@NonNull WindowWidget aWindow) {
         }
     }
 
+    @Override
+    public void onFullScreen(@NonNull WindowWidget aWindow, boolean aFullScreen) {
+        if (aFullScreen) {
+            mFullscreenWindow = aWindow;
+            aWindow.saveBeforeFullscreenPlacement();
+            setFullScreenSize(aWindow);
+            placeWindow(aWindow, WindowPlacement.FRONT);
+            focusWindow(aWindow);
+            for (WindowWidget win: getCurrentWindows()) {
+                setWindowVisible(win, win == mFullscreenWindow);
+            }
+            updateMaxWindowScales();
+            updateViews();
+        } else if (mFullscreenWindow != null) {
+            aWindow.restoreBeforeFullscreenPlacement();
+            mFullscreenWindow = null;
+            for (WindowWidget win : getCurrentWindows()) {
+                setWindowVisible(win, true);
+            }
+            updateMaxWindowScales();
+            updateViews();
+        }
+    }
+
     @Override
     public void onTabSelect(Session aTab) {
         WindowWidget targetWindow = mFocusedWindow;