/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package com.android.systemui.statusbar.phone;
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import android.content.Context;
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import android.content.res.Configuration;
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import android.util.AttributeSet;
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import android.util.Pair;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import androidx.annotation.VisibleForTesting;
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import java.util.ArrayList;
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import java.util.Comparator;
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/**
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* Redirects touches that aren't handled by any child view to the nearest
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* clickable child. Only takes effect on <sw600dp.
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*/
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public class NearestTouchFrame extends FrameLayout {
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private final ArrayList<View> mClickableChildren = new ArrayList<>();
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private final boolean mIsActive;
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private final int[] mTmpInt = new int[2];
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private final int[] mOffset = new int[2];
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private View mTouchingChild;
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public NearestTouchFrame(Context context, AttributeSet attrs) {
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this(context, attrs, context.getResources().getConfiguration());
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}
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@VisibleForTesting
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NearestTouchFrame(Context context, AttributeSet attrs, Configuration c) {
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super(context, attrs);
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mIsActive = c.smallestScreenWidthDp < 600;
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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mClickableChildren.clear();
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addClickableChildren(this);
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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super.onLayout(changed, left, top, right, bottom);
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getLocationInWindow(mOffset);
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}
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private void addClickableChildren(ViewGroup group) {
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final int N = group.getChildCount();
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for (int i = 0; i < N; i++) {
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View child = group.getChildAt(i);
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if (child.isClickable()) {
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mClickableChildren.add(child);
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} else if (child instanceof ViewGroup) {
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addClickableChildren((ViewGroup) child);
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}
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}
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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if (mIsActive) {
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if (event.getAction() == MotionEvent.ACTION_DOWN) {
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mTouchingChild = findNearestChild(event);
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}
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if (mTouchingChild != null) {
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event.offsetLocation(mTouchingChild.getWidth() / 2 - event.getX(),
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mTouchingChild.getHeight() / 2 - event.getY());
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return mTouchingChild.getVisibility() == VISIBLE
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&& mTouchingChild.dispatchTouchEvent(event);
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}
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}
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return super.onTouchEvent(event);
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}
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private View findNearestChild(MotionEvent event) {
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if (mClickableChildren.isEmpty()) {
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return null;
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}
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return mClickableChildren
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.stream()
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.filter(View::isAttachedToWindow)
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.map(v -> new Pair<>(distance(v, event), v))
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.min(Comparator.comparingInt(f -> f.first))
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.map(data -> data.second)
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.orElse(null);
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}
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private int distance(View v, MotionEvent event) {
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v.getLocationInWindow(mTmpInt);
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int left = mTmpInt[0] - mOffset[0];
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int top = mTmpInt[1] - mOffset[1];
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int right = left + v.getWidth();
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int bottom = top + v.getHeight();
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int x = Math.min(Math.abs(left - (int) event.getX()),
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Math.abs((int) event.getX() - right));
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int y = Math.min(Math.abs(top - (int) event.getY()),
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Math.abs((int) event.getY() - bottom));
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return Math.max(x, y);
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}
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}
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