From 769b8638f970c6cf62abb7ac46f80211b7c3afb6 Mon Sep 17 00:00:00 2001
From: Adam Powell <adamp@google.com>
Date: Mon, 4 Feb 2019 11:28:22 -0800
Subject: System gesture exclusion rects for Views

Allow views to register a list of rects where the device's system UI
should not intercept complex (read: down+move+up) gestures on specific
sub-regions of the view. This should not be used for large-scale,
full-view gesture recognition such as scrolling, but rather for specific
areas such as SeekBar's scroll thumb or DrawerLayout's edge strip for
swiping open a navigation drawer.

Add ability for ViewTreeObserver to observe transformed exclusion rects

Bug: 126360272
Test: atest android.view.cts.SystemGestureExclusionRectsTest
Change-Id: If89b6f66637e40efa12955d6408f6e37b25cb46f
---
 graphics/java/android/graphics/RenderNode.java | 67 ++++++++++++++++++++++++--
 1 file changed, 64 insertions(+), 3 deletions(-)

(limited to 'graphics/java/android')

diff --git a/graphics/java/android/graphics/RenderNode.java b/graphics/java/android/graphics/RenderNode.java
index e98879d0c5bd..42b6acd3b25a 100644
--- a/graphics/java/android/graphics/RenderNode.java
+++ b/graphics/java/android/graphics/RenderNode.java
@@ -27,6 +27,8 @@ import android.view.RenderNodeAnimator;
 import android.view.Surface;
 import android.view.View;
 
+import com.android.internal.util.ArrayUtils;
+
 import dalvik.annotation.optimization.CriticalNative;
 import dalvik.annotation.optimization.FastNative;
 
@@ -179,6 +181,10 @@ public final class RenderNode {
     private final AnimationHost mAnimationHost;
     private RecordingCanvas mCurrentRecordingCanvas;
 
+    // Will be null if not currently registered
+    @Nullable
+    private CompositePositionUpdateListener mCompositePositionUpdateListener;
+
     /**
      * Creates a new RenderNode that can be used to record batches of
      * drawing operations, and store / apply render properties when drawn.
@@ -248,15 +254,70 @@ public final class RenderNode {
 
     }
 
+    private static final class CompositePositionUpdateListener implements PositionUpdateListener {
+        private final PositionUpdateListener[] mListeners;
+
+        CompositePositionUpdateListener(PositionUpdateListener... listeners) {
+            mListeners = listeners;
+        }
+
+        public CompositePositionUpdateListener with(PositionUpdateListener listener) {
+            return new CompositePositionUpdateListener(
+                    ArrayUtils.appendElement(PositionUpdateListener.class, mListeners, listener));
+        }
+
+        public CompositePositionUpdateListener without(PositionUpdateListener listener) {
+            return new CompositePositionUpdateListener(
+                    ArrayUtils.removeElement(PositionUpdateListener.class, mListeners, listener));
+        }
+
+        @Override
+        public void positionChanged(long frameNumber, int left, int top, int right, int bottom) {
+            for (PositionUpdateListener pul : mListeners) {
+                pul.positionChanged(frameNumber, left, top, right, bottom);
+            }
+        }
+
+        @Override
+        public void positionLost(long frameNumber) {
+            for (PositionUpdateListener pul : mListeners) {
+                pul.positionLost(frameNumber);
+            }
+        }
+    }
+
     /**
-     * Enable callbacks for position changes.
+     * Enable callbacks for position changes. Call only from the UI thread or with
+     * external synchronization.
      *
      * @hide
      */
-    public void requestPositionUpdates(PositionUpdateListener listener) {
-        nRequestPositionUpdates(mNativeRenderNode, listener);
+    public void addPositionUpdateListener(@NonNull PositionUpdateListener listener) {
+        CompositePositionUpdateListener comp = mCompositePositionUpdateListener;
+        if (comp == null) {
+            comp = new CompositePositionUpdateListener(listener);
+        } else {
+            comp = comp.with(listener);
+        }
+        mCompositePositionUpdateListener = comp;
+        nRequestPositionUpdates(mNativeRenderNode, comp);
     }
 
+    /**
+     * Disable a callback for position changes. Call only from the UI thread or with
+     * external synchronization.
+     *
+     * @param listener Callback to remove
+     * @hide
+     */
+    public void removePositionUpdateListener(@NonNull PositionUpdateListener listener) {
+        CompositePositionUpdateListener comp = mCompositePositionUpdateListener;
+        if (comp != null) {
+            comp = comp.without(listener);
+            mCompositePositionUpdateListener = comp;
+            nRequestPositionUpdates(mNativeRenderNode, comp);
+        }
+    }
 
     /**
      * Starts recording a display list for the render node. All
-- 
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