Merge "Make only top bubble clickable when stack is collapsed"

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleController.java

@@ -1319,6 +1319,7 @@ public class BubbleController {
      * Updates the visibility of the bubbles based on current state.
      * Does not un-bubble, just hides or un-hides.
      * Updates stack description for TalkBack focus.
+     * Updates bubbles' icon views clickable states
      */
     public void updateStack() {
         if (mStackView == null) {
@@ -1336,6 +1337,8 @@ public class BubbleController {
         }
 
         mStackView.updateContentDescription();
+
+        mStackView.updateBubblesClickableStates();
     }
 
     @VisibleForTesting

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleStackView.java

@@ -1485,6 +1485,25 @@ public class BubbleStackView extends FrameLayout
         }
     }
 
+    /**
+     * Update bubbles' icon views clickable states.
+     */
+    public void updateBubblesClickableStates() {
+        for (int i = 0; i < mBubbleData.getBubbles().size(); i++) {
+            final Bubble bubble = mBubbleData.getBubbles().get(i);
+            if (bubble.getIconView() != null) {
+                if (mIsExpanded) {
+                    // when stack is expanded all bubbles are clickable
+                    bubble.getIconView().setClickable(true);
+                } else {
+                    // when stack is collapsed, only the top bubble needs to be clickable,
+                    // so that a11y ignores all the inaccessible bubbles in the stack
+                    bubble.getIconView().setClickable(i == 0);
+                }
+            }
+        }
+    }
+
     private void updateSystemGestureExcludeRects() {
         // Exclude the region occupied by the first BubbleView in the stack
         Rect excludeZone = mSystemGestureExclusionRects.get(0);