commit 1cc48e1d0c0bd30bc59cc37c4d49ee78b01424f0
author Sunny Goyal <sunnygoyal@google.com> Thu Sep 15 12:32:28 2016 -0700
committer Sunny Goyal <sunnygoyal@google.com> Thu Sep 15 13:37:13 2016 -0700
tree 9a57d9f4d96959cd5effc131c71b01a54e3cd9f0
parent da1c17c492d7e253a08a47dd2d79637177c4401d

Adding support for extending the touch target in the touchDelegate

Bug: 31458312
Change-Id: Ic819bdede2776ff63ec17053cc1326415edc1ca0

src/com/android/launcher3/util/TransformingTouchDelegate.java

diff --git a/src/com/android/launcher3/util/TransformingTouchDelegate.java b/src/com/android/launcher3/util/TransformingTouchDelegate.java
index da1de5e..3197ba9 100644
--- a/src/com/android/launcher3/util/TransformingTouchDelegate.java
+++ b/src/com/android/launcher3/util/TransformingTouchDelegate.java
@@ -33,6 +33,10 @@
 
     private final RectF mBounds;
 
+    private final RectF mTouchCheckBounds;
+    private float mTouchExtension;
+    private boolean mWasTouchOutsideBounds;
+
     private View mDelegateView;
     private boolean mDelegateTargeted;
 
@@ -41,10 +45,22 @@
 
         mDelegateView = delegateView;
         mBounds = new RectF();
+        mTouchCheckBounds = new RectF();
     }
 
     public void setBounds(int left, int top, int right, int bottom) {
         mBounds.set(left, top, right, bottom);
+        updateTouchBounds();
+    }
+
+    public void extendTouchBounds(float extension) {
+        mTouchExtension = extension;
+        updateTouchBounds();
+    }
+
+    private void updateTouchBounds() {
+        mTouchCheckBounds.set(mBounds);
+        mTouchCheckBounds.inset(-mTouchExtension, -mTouchExtension);
     }
 
     public void setDelegateView(View view) {
@@ -62,8 +78,9 @@
         boolean sendToDelegate = false;
         switch (event.getAction()) {
             case MotionEvent.ACTION_DOWN:
-                mDelegateTargeted = mBounds.contains(event.getX(), event.getY());
+                mDelegateTargeted = mTouchCheckBounds.contains(event.getX(), event.getY());
                 if (mDelegateTargeted) {
+                    mWasTouchOutsideBounds = !mBounds.contains(event.getX(), event.getY());
                     sendToDelegate = true;
                 }
                 break;
@@ -78,9 +95,15 @@
         }
         boolean handled = false;
         if (sendToDelegate) {
-            event.offsetLocation(-mBounds.left, -mBounds.top);
+            float x = event.getX();
+            float y = event.getY();
+            if (mWasTouchOutsideBounds) {
+                event.setLocation(mBounds.centerX(), mBounds.centerY());
+            } else {
+                event.offsetLocation(-mBounds.left, -mBounds.top);
+            }
             handled = mDelegateView.dispatchTouchEvent(event);
-            event.offsetLocation(mBounds.left, mBounds.top);
+            event.setLocation(x, y);
         }
         return handled;
     }