1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 5 * except in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the 10 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 11 * KIND, either express or implied. See the License for the specific language governing 12 * permissions and limitations under the License. 13 */ 14 15 package com.android.systemui.statusbar.phone; 16 17 import android.content.Context; 18 import android.content.res.Configuration; 19 import android.graphics.Rect; 20 import android.support.annotation.VisibleForTesting; 21 import android.util.AttributeSet; 22 import android.util.Log; 23 import android.util.Pair; 24 import android.view.MotionEvent; 25 import android.view.View; 26 import android.view.ViewGroup; 27 import android.widget.FrameLayout; 28 29 import com.android.systemui.R; 30 31 import java.util.ArrayList; 32 import java.util.Comparator; 33 34 /** 35 * Redirects touches that aren't handled by any child view to the nearest 36 * clickable child. Only takes effect on <sw600dp. 37 */ 38 public class NearestTouchFrame extends FrameLayout { 39 40 private final ArrayList<View> mClickableChildren = new ArrayList<>(); 41 private final boolean mIsActive; 42 private final int[] mTmpInt = new int[2]; 43 private final int[] mOffset = new int[2]; 44 private View mTouchingChild; 45 NearestTouchFrame(Context context, AttributeSet attrs)46 public NearestTouchFrame(Context context, AttributeSet attrs) { 47 this(context, attrs, context.getResources().getConfiguration()); 48 } 49 50 @VisibleForTesting NearestTouchFrame(Context context, AttributeSet attrs, Configuration c)51 NearestTouchFrame(Context context, AttributeSet attrs, Configuration c) { 52 super(context, attrs); 53 mIsActive = c.smallestScreenWidthDp < 600; 54 } 55 56 @Override 57 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 58 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 59 mClickableChildren.clear(); 60 addClickableChildren(this); 61 } 62 63 @Override 64 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 65 super.onLayout(changed, left, top, right, bottom); 66 getLocationInWindow(mOffset); 67 } 68 69 private void addClickableChildren(ViewGroup group) { 70 final int N = group.getChildCount(); 71 for (int i = 0; i < N; i++) { 72 View child = group.getChildAt(i); 73 if (child.isClickable()) { 74 mClickableChildren.add(child); 75 } else if (child instanceof ViewGroup) { 76 addClickableChildren((ViewGroup) child); 77 } 78 } 79 } 80 81 @Override 82 public boolean onTouchEvent(MotionEvent event) { 83 if (mIsActive) { 84 if (event.getAction() == MotionEvent.ACTION_DOWN) { 85 mTouchingChild = findNearestChild(event); 86 } 87 if (mTouchingChild != null) { 88 event.offsetLocation(mTouchingChild.getWidth() / 2 - event.getX(), 89 mTouchingChild.getHeight() / 2 - event.getY()); 90 return mTouchingChild.getVisibility() == VISIBLE 91 && mTouchingChild.dispatchTouchEvent(event); 92 } 93 } 94 return super.onTouchEvent(event); 95 } 96 97 private View findNearestChild(MotionEvent event) { 98 return mClickableChildren 99 .stream() 100 .filter(v -> v.isAttachedToWindow()) 101 .map(v -> new Pair<>(distance(v, event), v)) 102 .min(Comparator.comparingInt(f -> f.first)) 103 .get().second; 104 } 105 distance(View v, MotionEvent event)106 private int distance(View v, MotionEvent event) { 107 v.getLocationInWindow(mTmpInt); 108 int left = mTmpInt[0] - mOffset[0]; 109 int top = mTmpInt[1] - mOffset[1]; 110 int right = left + v.getWidth(); 111 int bottom = top + v.getHeight(); 112 113 int x = Math.min(Math.abs(left - (int) event.getX()), 114 Math.abs((int) event.getX() - right)); 115 int y = Math.min(Math.abs(top - (int) event.getY()), 116 Math.abs((int) event.getY() - bottom)); 117 118 return Math.max(x, y); 119 } 120 } 121