1 /* 2 * Copyright (C) 2017 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 17 package com.android.systemui; 18 19 import android.content.Context; 20 import android.graphics.Region; 21 import android.graphics.Region.Op; 22 import android.util.AttributeSet; 23 import android.view.View; 24 import android.view.ViewTreeObserver.InternalInsetsInfo; 25 import android.view.ViewTreeObserver.OnComputeInternalInsetsListener; 26 import android.widget.FrameLayout; 27 28 /** 29 * Frame layout that will intercept the touches of children if they want to 30 */ 31 public class RegionInterceptingFrameLayout extends FrameLayout { 32 public RegionInterceptingFrameLayout(Context context) { 33 super(context); 34 } 35 36 public RegionInterceptingFrameLayout(Context context, AttributeSet attrs) { 37 super(context, attrs); 38 } 39 40 public RegionInterceptingFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) { 41 super(context, attrs, defStyleAttr); 42 } 43 44 public RegionInterceptingFrameLayout(Context context, AttributeSet attrs, int defStyleAttr, 45 int defStyleRes) { 46 super(context, attrs, defStyleAttr, defStyleRes); 47 } 48 49 @Override 50 protected void onAttachedToWindow() { 51 super.onAttachedToWindow(); 52 getViewTreeObserver().addOnComputeInternalInsetsListener(mInsetsListener); 53 } 54 55 @Override 56 protected void onDetachedFromWindow() { 57 super.onDetachedFromWindow(); 58 getViewTreeObserver().removeOnComputeInternalInsetsListener(mInsetsListener); 59 } 60 61 private final OnComputeInternalInsetsListener mInsetsListener = internalInsetsInfo -> { 62 internalInsetsInfo.setTouchableInsets(InternalInsetsInfo.TOUCHABLE_INSETS_REGION); 63 internalInsetsInfo.touchableRegion.setEmpty(); 64 for (int i = 0; i < getChildCount(); i++) { 65 View child = getChildAt(i); 66 if (!(child instanceof RegionInterceptableView)) { 67 continue; 68 } 69 RegionInterceptableView riv = (RegionInterceptableView) child; 70 if (!riv.shouldInterceptTouch()) { 71 continue; 72 } 73 Region unionRegion = riv.getInterceptRegion(); 74 if (unionRegion == null) { 75 continue; 76 } 77 78 internalInsetsInfo.touchableRegion.op(unionRegion, Op.UNION); 79 } 80 }; 81 82 public interface RegionInterceptableView { 83 default public boolean shouldInterceptTouch() { 84 return false; 85 } 86 87 public Region getInterceptRegion(); 88 } 89 } 90
