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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui.navigationbar.buttons;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import androidx.annotation.VisibleForTesting;
import com.android.systemui.R;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Redirects touches that aren't handled by any child view to the nearest
* clickable child. Only takes effect on <sw600dp.
*/
public class NearestTouchFrame extends FrameLayout {
private final List<View> mClickableChildren = new ArrayList<>();
private final List<View> mAttachedChildren = new ArrayList<>();
private final boolean mIsActive;
private final int[] mTmpInt = new int[2];
private final int[] mOffset = new int[2];
private boolean mIsVertical;
private View mTouchingChild;
private final Map<View, Rect> mTouchableRegions = new HashMap<>();
/**
* Used to sort all child views either by their left position or their top position,
* depending on if this layout is used horizontally or vertically, respectively
*/
private final Comparator<View> mChildRegionComparator =
(view1, view2) -> {
int leftTopIndex = 0;
if (mIsVertical) {
// Compare view bound's "top" values
leftTopIndex = 1;
}
view1.getLocationInWindow(mTmpInt);
int startingCoordView1 = mTmpInt[leftTopIndex] - mOffset[leftTopIndex];
view2.getLocationInWindow(mTmpInt);
int startingCoordView2 = mTmpInt[leftTopIndex] - mOffset[leftTopIndex];
return startingCoordView1 - startingCoordView2;
};
public NearestTouchFrame(Context context, AttributeSet attrs) {
this(context, attrs, context.getResources().getConfiguration());
}
@VisibleForTesting
NearestTouchFrame(Context context, AttributeSet attrs, Configuration c) {
super(context, attrs);
mIsActive = c.smallestScreenWidthDp < 600;
int[] attrsArray = new int[] {R.attr.isVertical};
TypedArray ta = context.obtainStyledAttributes(attrs, attrsArray);
mIsVertical = ta.getBoolean(0, false);
ta.recycle();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
mClickableChildren.clear();
mAttachedChildren.clear();
mTouchableRegions.clear();
addClickableChildren(this);
getLocationInWindow(mOffset);
cacheClosestChildLocations();
}
/**
* Populates {@link #mTouchableRegions} with the regions where each clickable child is the
* closest for a given point on this layout.
*/
private void cacheClosestChildLocations() {
if (getWidth() == 0 || getHeight() == 0) {
return;
}
// Sort by either top or left depending on mIsVertical, then take out all children
// that are not attached to window
mClickableChildren.sort(mChildRegionComparator);
mClickableChildren.stream()
.filter(View::isAttachedToWindow)
.forEachOrdered(mAttachedChildren::add);
// Cache bounds of children
// Mark coordinates where the actual child layout resides in this frame's window
for (int i = 0; i < mAttachedChildren.size(); i++) {
View child = mAttachedChildren.get(i);
if (!child.isAttachedToWindow()) {
continue;
}
Rect childRegion = getChildsBounds(child);
// We compute closest child from this child to the previous one
if (i == 0) {
// First child, nothing to the left/top of it
if (mIsVertical) {
childRegion.top = 0;
} else {
childRegion.left = 0;
}
mTouchableRegions.put(child, childRegion);
continue;
}
View previousChild = mAttachedChildren.get(i - 1);
Rect previousChildBounds = mTouchableRegions.get(previousChild);
int midPoint;
if (mIsVertical) {
int distance = childRegion.top - previousChildBounds.bottom;
midPoint = distance / 2;
childRegion.top -= midPoint;
previousChildBounds.bottom += midPoint - ((distance % 2) == 0 ? 1 : 0);
} else {
int distance = childRegion.left - previousChildBounds.right;
midPoint = distance / 2;
childRegion.left -= midPoint;
previousChildBounds.right += midPoint - ((distance % 2) == 0 ? 1 : 0);
}
if (i == mClickableChildren.size() - 1) {
// Last child, nothing to right/bottom of it
if (mIsVertical) {
childRegion.bottom = getHeight();
} else {
childRegion.right = getWidth();
}
}
mTouchableRegions.put(child, childRegion);
}
}
@VisibleForTesting
void setIsVertical(boolean isVertical) {
mIsVertical = isVertical;
}
private Rect getChildsBounds(View child) {
child.getLocationInWindow(mTmpInt);
int left = mTmpInt[0] - mOffset[0];
int top = mTmpInt[1] - mOffset[1];
int right = left + child.getWidth();
int bottom = top + child.getHeight();
return new Rect(left, top, right, bottom);
}
private void addClickableChildren(ViewGroup group) {
final int N = group.getChildCount();
for (int i = 0; i < N; i++) {
View child = group.getChildAt(i);
if (child.isClickable()) {
mClickableChildren.add(child);
} else if (child instanceof ViewGroup) {
addClickableChildren((ViewGroup) child);
}
}
}
/**
* @return A Map where the key is the view object of the button and the value
* is the Rect where that button will receive a touch event if pressed. This Rect will
* usually be larger than the layout bounds for the button.
* The Rect is in screen coordinates.
*/
public Map<View, Rect> getFullTouchableChildRegions() {
Map<View, Rect> fullTouchRegions = new HashMap<>(mTouchableRegions.size());
getLocationOnScreen(mTmpInt);
for (Map.Entry<View, Rect> entry : mTouchableRegions.entrySet()) {
View child = entry.getKey();
Rect screenRegion = new Rect(entry.getValue());
screenRegion.offset(mTmpInt[0], mTmpInt[1]);
fullTouchRegions.put(child, screenRegion);
}
return fullTouchRegions;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mIsActive) {
int x = (int) event.getX();
int y = (int) event.getY();
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mTouchingChild = mClickableChildren
.stream()
.filter(View::isAttachedToWindow)
.filter(view -> mTouchableRegions.get(view).contains(x, y))
.findFirst()
.orElse(null);
}
if (mTouchingChild != null) {
event.offsetLocation(mTouchingChild.getWidth() / 2 - x,
mTouchingChild.getHeight() / 2 - y);
return mTouchingChild.getVisibility() == VISIBLE
&& mTouchingChild.dispatchTouchEvent(event);
}
}
return super.onTouchEvent(event);
}
}
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