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/*
* Copyright (C) 2017 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;
import android.content.Context;
import android.graphics.Region;
import android.graphics.Region.Op;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.InternalInsetsInfo;
import android.view.ViewTreeObserver.OnComputeInternalInsetsListener;
import android.widget.FrameLayout;
/**
* Frame layout that will intercept the touches of children if they want to
*/
public class RegionInterceptingFrameLayout extends FrameLayout {
public RegionInterceptingFrameLayout(Context context) {
super(context);
}
public RegionInterceptingFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RegionInterceptingFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public RegionInterceptingFrameLayout(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
getViewTreeObserver().addOnComputeInternalInsetsListener(mInsetsListener);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
getViewTreeObserver().removeOnComputeInternalInsetsListener(mInsetsListener);
}
private final OnComputeInternalInsetsListener mInsetsListener = internalInsetsInfo -> {
internalInsetsInfo.setTouchableInsets(InternalInsetsInfo.TOUCHABLE_INSETS_REGION);
internalInsetsInfo.touchableRegion.setEmpty();
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if (!(child instanceof RegionInterceptableView)) {
continue;
}
RegionInterceptableView riv = (RegionInterceptableView) child;
if (!riv.shouldInterceptTouch()) {
continue;
}
Region unionRegion = riv.getInterceptRegion();
if (unionRegion == null) {
continue;
}
internalInsetsInfo.touchableRegion.op(riv.getInterceptRegion(), Op.UNION);
}
};
public interface RegionInterceptableView {
default public boolean shouldInterceptTouch() {
return false;
}
public Region getInterceptRegion();
}
}
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