Only handle resize touches if starting gesture within resize area

- Only dispatch touch events to the resize gesture handler if started
  within the touch area (and reset the touch state to prevent normal
  handling)
- Fix an issue with being able to drag on the pip edge touching the edge
  of the screen due to the movement bounds not taking the resized pip
  into account

Bug: 160160987
Test: Repeatedly swipe on the drag handle on the edge of the screen

Change-Id: Id616c7ee2ee102f26de83e827589058ff24987ef

packages/SystemUI/src/com/android/systemui/pip/phone/PipResizeGestureHandler.java

@@ -55,7 +55,9 @@ import com.android.systemui.pip.PipBoundsHandler;
 import com.android.systemui.pip.PipTaskOrganizer;
 import com.android.systemui.util.DeviceConfigProxy;
 
+import java.io.PrintWriter;
 import java.util.concurrent.Executor;
+import java.util.function.Function;
 import java.util.function.Supplier;
 
 /**
@@ -94,7 +96,7 @@ public class PipResizeGestureHandler {
     private final Rect mTmpBottomLeftCorner = new Rect();
     private final Rect mTmpBottomRightCorner = new Rect();
     private final Rect mDisplayBounds = new Rect();
-    private final Supplier<Rect> mMovementBoundsSupplier;
+    private final Function<Rect, Rect> mMovementBoundsSupplier;
     private final Runnable mUpdateMovementBoundsRunnable;
 
     private int mDelta;
@@ -113,7 +115,7 @@ public class PipResizeGestureHandler {
 
     public PipResizeGestureHandler(Context context, PipBoundsHandler pipBoundsHandler,
             PipMotionHelper motionHelper, DeviceConfigProxy deviceConfig,
-            PipTaskOrganizer pipTaskOrganizer, Supplier<Rect> movementBoundsSupplier,
+            PipTaskOrganizer pipTaskOrganizer, Function<Rect, Rect> movementBoundsSupplier,
             Runnable updateMovementBoundsRunnable, SysUiState sysUiState) {
         mContext = context;
         mDisplayId = context.getDisplayId();
@@ -244,10 +246,15 @@ public class PipResizeGestureHandler {
         return mTmpRegion.contains(x, y);
     }
 
+    public boolean willStartResizeGesture(MotionEvent ev) {
+        return mEnableUserResize && isInValidSysUiState()
+                && isWithinTouchRegion((int) ev.getRawX(), (int) ev.getRawY());
+    }
+
     private void setCtrlType(int x, int y) {
         final Rect currentPipBounds = mMotionHelper.getBounds();
 
-        Rect movementBounds = mMovementBoundsSupplier.get();
+        Rect movementBounds = mMovementBoundsSupplier.apply(currentPipBounds);
         mDisplayBounds.set(movementBounds.left,
                 movementBounds.top,
                 movementBounds.right + currentPipBounds.width(),
@@ -353,6 +360,16 @@ public class PipResizeGestureHandler {
         mMinSize.set(minX, minY);
     }
 
+    public void dump(PrintWriter pw, String prefix) {
+        final String innerPrefix = prefix + "  ";
+        pw.println(prefix + TAG);
+        pw.println(innerPrefix + "mAllowGesture=" + mAllowGesture);
+        pw.println(innerPrefix + "mIsAttached=" + mIsAttached);
+        pw.println(innerPrefix + "mIsEnabled=" + mIsEnabled);
+        pw.println(innerPrefix + "mEnableUserResize=" + mEnableUserResize);
+        pw.println(innerPrefix + "mThresholdCrossed=" + mThresholdCrossed);
+    }
+
     class SysUiInputEventReceiver extends BatchedInputEventReceiver {
         SysUiInputEventReceiver(InputChannel channel, Looper looper) {
             super(channel, looper, Choreographer.getSfInstance());

packages/SystemUI/src/com/android/systemui/pip/phone/PipTouchHandler.java

@@ -644,12 +644,12 @@ public class PipTouchHandler {
         }
 
         MotionEvent ev = (MotionEvent) inputEvent;
-        if (!mTouchState.isDragging()
-                && !mMagnetizedPip.getObjectStuckToTarget()
-                && !mMotionHelper.isAnimating()
-                && mPipResizeGestureHandler.isWithinTouchRegion(
-                        (int) ev.getRawX(), (int) ev.getRawY())) {
+        if (ev.getActionMasked() == MotionEvent.ACTION_DOWN
+                && mPipResizeGestureHandler.willStartResizeGesture(ev)) {
+            // Initialize the touch state for the gesture, but immediately reset to invalidate the
+            // gesture
             mTouchState.onTouchEvent(ev);
+            mTouchState.reset();
             return true;
         }
 
@@ -1032,8 +1032,11 @@ public class PipTouchHandler {
                 isMenuExpanded  && willResizeMenu() ? mExpandedShortestEdgeSize : 0);
     }
 
-    private Rect getMovementBounds() {
-        return mMovementBounds;
+    private Rect getMovementBounds(Rect curBounds) {
+        Rect movementBounds = new Rect();
+        mSnapAlgorithm.getMovementBounds(curBounds, mInsetBounds,
+                movementBounds, mIsImeShowing ? mImeHeight : 0);
+        return movementBounds;
     }
 
     /**
@@ -1065,6 +1068,9 @@ public class PipTouchHandler {
         pw.println(innerPrefix + "mMovementBoundsExtraOffsets=" + mMovementBoundsExtraOffsets);
         mTouchState.dump(pw, innerPrefix);
         mMotionHelper.dump(pw, innerPrefix);
+        if (mPipResizeGestureHandler != null) {
+            mPipResizeGestureHandler.dump(pw, innerPrefix);
+        }
     }
 
 }