Disable headlock when in VR videos

VR videos are meant for users to be immersed in the whole space around them. Because headlock locks users in the front of them, it needs to be disabled in VR videos. If users enabled headlock before entering VR videos, we disable it when VR videos show and reenable it when they are exited.

Fixes Igalia#1698

app/src/common/shared/com/igalia/wolvic/VRBrowserActivity.java

@@ -2022,6 +2022,7 @@ public void onRequestPermissionsResult(int requestCode, @NonNull  String[] permi
 
     @Override
     public void showVRVideo(final int aWindowHandle, final @VideoProjectionMenuWidget.VideoProjectionFlags int aVideoProjection) {
+        getNavigationBar().disableHeadlockForVRVideo();
         queueRunnable(() -> showVRVideoNative(aWindowHandle, aVideoProjection));
     }
 

app/src/common/shared/com/igalia/wolvic/ui/widgets/NavigationBarWidget.java

@@ -99,6 +99,8 @@ public class NavigationBarWidget extends UIWidget implements WSession.Navigation
     private static final int POPUP_NOTIFICATION_ID = 3;
     private static final int WEB_APP_ADDED_NOTIFICATION_ID = 4;
 
+    private boolean shouldRestoreHeadLockOnVRVideoExit;
+
     public interface NavigationListener {
         void onBack();
         void onForward();
@@ -773,6 +775,14 @@ private void enterFullScreenMode() {
         mWidgetManager.pushWorldBrightness(mBrightnessWidget, mBrightnessWidget.getSelectedBrightness());
     }
 
+    public void disableHeadlockForVRVideo() {
+        SettingsStore settingsStore = SettingsStore.getInstance(getContext());
+        if (settingsStore.isHeadLockEnabled()) {
+            settingsStore.setHeadLockEnabled(false);
+            shouldRestoreHeadLockOnVRVideoExit = true;
+        }
+    }
+
     private void exitFullScreenMode() {
         mWidgetPlacement = mBeforeFullscreenPlacement;
         updateWidget();
@@ -996,6 +1006,10 @@ private void exitVRVideo() {
         mWidgetManager.setCylinderDensityForce(mSavedCylinderDensity);
         // Reposition UI in front of the user when exiting a VR video.
         mWidgetManager.recenterUIYaw(WidgetManagerDelegate.YAW_TARGET_ALL);
+
+        if (shouldRestoreHeadLockOnVRVideoExit) {
+            SettingsStore.getInstance(getContext()).setHeadLockEnabled(true);
+        }
     }
 
     private void setResizePreset(float aMultiplier) {