Reduce the window tap exclude region for child above it

For letting touches directly go to the embedded display, we've opened a
tap exclude region for the ActivityView. However, if there is a view on
top of the region, the view cannot be touched within the region.

In this CL, we reduce the tap exclude region if there is a can-receive-
pointer-event view on top of the region.

Bug: 128517544
Test: atest CtsActivityManagerDeviceTestCases:ActivityViewTest
Test: atest FrameworksCoreTests:ViewGroupTest
Test: Menual test with ActivityViewTest and Bubbles
Change-Id: I68e2a9fe9d0891801b533ab8d25074f64bef5a79

1 files changed, 14 insertions, 0 deletions

diff --git a/core/java/android/view/ViewParent.java b/core/java/android/view/ViewParent.java
index 572e69b1a78c..feba7bb7f195 100644
--- a/core/java/android/view/ViewParent.java
+++ b/core/java/android/view/ViewParent.java
@@ -18,6 +18,7 @@ package android.view;
 
 import android.annotation.NonNull;
 import android.graphics.Rect;
+import android.graphics.Region;
 import android.os.Bundle;
 import android.view.accessibility.AccessibilityEvent;
 
@@ -660,4 +661,17 @@ public interface ViewParent {
      * @return true if the action was consumed by this ViewParent
      */
     public boolean onNestedPrePerformAccessibilityAction(View target, int action, Bundle arguments);
+
+    /**
+     * Given a touchable region of a child, this method reduces region by the bounds of all views on
+     * top of the child for which {@link View#canReceivePointerEvents} returns {@code true}. This
+     * applies recursively for all views in the view hierarchy on top of this one.
+     *
+     * @param touchableRegion The touchable region we want to modify.
+     * @param view A child view of this ViewGroup which indicates the z-order of the touchable
+     *             region.
+     * @hide
+     */
+    default void subtractObscuredTouchableRegion(Region touchableRegion, View view) {
+    }
 }