Jason Monk | 9262c94 | 2017-07-28 14:35:13 -0400 | [diff] [blame^] | 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.graphics.Rect; |
| 19 | import android.util.AttributeSet; |
| 20 | import android.util.Log; |
| 21 | import android.util.Pair; |
| 22 | import android.view.MotionEvent; |
| 23 | import android.view.View; |
| 24 | import android.view.ViewGroup; |
| 25 | import android.widget.FrameLayout; |
| 26 | |
| 27 | import com.android.systemui.R; |
| 28 | |
| 29 | import java.util.ArrayList; |
| 30 | import java.util.Comparator; |
| 31 | |
| 32 | /** |
| 33 | * Redirects touches that aren't handled by any child view to the nearest |
| 34 | * clickable child. Only takes effect on <sw600dp. |
| 35 | */ |
| 36 | public class NearestTouchFrame extends FrameLayout { |
| 37 | |
| 38 | private final ArrayList<View> mClickableChildren = new ArrayList<>(); |
| 39 | private final boolean mIsActive; |
| 40 | private final int[] mTmpInt = new int[2]; |
| 41 | private final int[] mOffset = new int[2]; |
| 42 | private View mTouchingChild; |
| 43 | |
| 44 | public NearestTouchFrame(Context context, AttributeSet attrs) { |
| 45 | super(context, attrs); |
| 46 | mIsActive = context.getResources().getConfiguration().smallestScreenWidthDp < 600; |
| 47 | } |
| 48 | |
| 49 | @Override |
| 50 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 51 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 52 | mClickableChildren.clear(); |
| 53 | addClickableChildren(this); |
| 54 | } |
| 55 | |
| 56 | @Override |
| 57 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| 58 | super.onLayout(changed, left, top, right, bottom); |
| 59 | getLocationInWindow(mOffset); |
| 60 | } |
| 61 | |
| 62 | private void addClickableChildren(ViewGroup group) { |
| 63 | final int N = group.getChildCount(); |
| 64 | for (int i = 0; i < N; i++) { |
| 65 | View child = group.getChildAt(i); |
| 66 | if (child.isClickable()) { |
| 67 | mClickableChildren.add(child); |
| 68 | } else if (child instanceof ViewGroup) { |
| 69 | addClickableChildren((ViewGroup) child); |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | @Override |
| 75 | public boolean onTouchEvent(MotionEvent event) { |
| 76 | if (mIsActive) { |
| 77 | if (event.getAction() == MotionEvent.ACTION_DOWN) { |
| 78 | mTouchingChild = findNearestChild(event); |
| 79 | } |
| 80 | if (mTouchingChild != null) { |
| 81 | event.offsetLocation(mTouchingChild.getWidth() / 2 - event.getX(), |
| 82 | mTouchingChild.getHeight() / 2 - event.getY()); |
| 83 | return mTouchingChild.dispatchTouchEvent(event); |
| 84 | } |
| 85 | } |
| 86 | return super.onTouchEvent(event); |
| 87 | } |
| 88 | |
| 89 | private View findNearestChild(MotionEvent event) { |
| 90 | return mClickableChildren.stream().map(v -> new Pair<>(distance(v, event), v)) |
| 91 | .min(Comparator.comparingInt(f -> f.first)).get().second; |
| 92 | } |
| 93 | |
| 94 | private int distance(View v, MotionEvent event) { |
| 95 | v.getLocationInWindow(mTmpInt); |
| 96 | int left = mTmpInt[0] - mOffset[0]; |
| 97 | int top = mTmpInt[1] - mOffset[1]; |
| 98 | int right = left + v.getWidth(); |
| 99 | int bottom = top + v.getHeight(); |
| 100 | |
| 101 | int x = Math.min(Math.abs(left - (int) event.getX()), |
| 102 | Math.abs((int) event.getX() - right)); |
| 103 | int y = Math.min(Math.abs(top - (int) event.getY()), |
| 104 | Math.abs((int) event.getY() - bottom)); |
| 105 | |
| 106 | return Math.max(x, y); |
| 107 | } |
| 108 | } |