1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.wallpaper.picker; 17 18 import android.content.Context; 19 import android.util.AttributeSet; 20 import android.view.GestureDetector; 21 import android.view.MotionEvent; 22 import android.view.View; 23 import android.widget.FrameLayout; 24 25 /** A frame layout that listens to touch events and routes them to another view. */ 26 public class TouchForwardingLayout extends FrameLayout { 27 28 private View mView; 29 private boolean mForwardingEnabled; 30 private GestureDetector mGestureDetector; 31 TouchForwardingLayout(Context context, AttributeSet attrs)32 public TouchForwardingLayout(Context context, AttributeSet attrs) { 33 super(context, attrs); 34 mGestureDetector = new GestureDetector(context, 35 new GestureDetector.SimpleOnGestureListener() { 36 @Override 37 public boolean onSingleTapConfirmed(MotionEvent e) { 38 return performClick(); 39 } 40 }); 41 } 42 43 @Override dispatchTouchEvent(MotionEvent ev)44 public boolean dispatchTouchEvent(MotionEvent ev) { 45 mGestureDetector.onTouchEvent(ev); 46 if (mView != null && mForwardingEnabled) { 47 mView.dispatchTouchEvent(ev); 48 } 49 return true; 50 } 51 52 /** Set the view that the touch events are routed to */ setTargetView(View view)53 public void setTargetView(View view) { 54 mView = view; 55 } 56 setForwardingEnabled(boolean forwardingEnabled)57 public void setForwardingEnabled(boolean forwardingEnabled) { 58 mForwardingEnabled = forwardingEnabled; 59 } 60 } 61