[-1] Show toast when user trys to swipe to -1 on extreme battery saver mode

Fix: 355485335
Flag: com.android.launcher3.use_activity_overlay
Test: manual - record a video
Change-Id: I79a3ece2fb2c0d1eddac0e4f91274ffe222e317f

src/com/android/launcher3/Launcher.java

@@ -3036,6 +3036,7 @@ public class Launcher extends StatefulActivity<LauncherState>
         return mPopupDataProvider.getDotInfoForItem(info);
     }
 
+    @NonNull
     public LauncherOverlayManager getOverlayManager() {
         return mOverlayManager;
     }

src/com/android/launcher3/PagedView.java

@@ -1463,6 +1463,15 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
                 mEdgeGlowLeft.onFlingVelocity(velocity);
                 mEdgeGlowRight.onFlingVelocity(velocity);
             }
+
+            // Detect if user tries to swipe to -1 page but gets disallowed by checking if there was
+            // left-over values in mEdgeGlowLeft (or mEdgeGlowRight in RLT).
+            final int layoutDir = getLayoutDirection();
+            if ((mEdgeGlowLeft.getDistance() > 0 && layoutDir == LAYOUT_DIRECTION_LTR)
+                    || (mEdgeGlowRight.getDistance() > 0 && layoutDir == LAYOUT_DIRECTION_RTL)) {
+                onDisallowSwipeToMinusOnePage();
+            }
+
             mEdgeGlowLeft.onRelease(ev);
             mEdgeGlowRight.onRelease(ev);
             // End any intermediate reordering states
@@ -1487,6 +1496,8 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         return true;
     }
 
+    protected void onDisallowSwipeToMinusOnePage() {}
+
     protected void onNotSnappingToPageInFreeScroll() { }
 
     /**

src/com/android/launcher3/Workspace.java

@@ -1123,6 +1123,11 @@ public class Workspace<T extends View & PageIndicator> extends PagedView<T>
         return super.onTouchEvent(ev);
     }
 
+    @Override
+    protected void onDisallowSwipeToMinusOnePage() {
+        mLauncher.getOverlayManager().onDisallowSwipeToMinusOnePage();
+    }
+
     /**
      * Called directly from a CellLayout (not by the framework), after we've been added as a
      * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout

src_plugins/com/android/systemui/plugins/shared/LauncherOverlayManager.java

@@ -49,6 +49,8 @@ public interface LauncherOverlayManager {
 
     default void onActivityDestroyed() { }
 
+    default void onDisallowSwipeToMinusOnePage() {}
+
     /**
      * @deprecated use LauncherOverlayTouchProxy directly
      */