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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.internal.widget;
import android.annotation.Nullable;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.RemoteViews;
import java.util.ArrayList;
/**
* A LinearLayout that sets it's height again after the last measure pass. This is needed for
* MessagingLayouts where groups need to be able to snap it's height to.
*/
@RemoteViews.RemoteView
public class RemeasuringLinearLayout extends LinearLayout {
private ArrayList<View> mMatchParentViews = new ArrayList<>();
public RemeasuringLinearLayout(Context context) {
super(context);
}
public RemeasuringLinearLayout(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public RemeasuringLinearLayout(Context context, @Nullable AttributeSet attrs,
int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public RemeasuringLinearLayout(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int count = getChildCount();
int height = 0;
boolean isVertical = getOrientation() == LinearLayout.VERTICAL;
boolean isWrapContent = getLayoutParams().height == LayoutParams.WRAP_CONTENT;
for (int i = 0; i < count; ++i) {
final View child = getChildAt(i);
if (child == null || child.getVisibility() == View.GONE) {
continue;
}
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (!isWrapContent || lp.height != LayoutParams.MATCH_PARENT || isVertical) {
int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
height = Math.max(height, isVertical ? height + childHeight : childHeight);
} else {
// We have match parent children in a wrap content view, let's measure the
// view properly
mMatchParentViews.add(child);
}
}
if (mMatchParentViews.size() > 0) {
int exactHeightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
for (View child : mMatchParentViews) {
child.measure(getChildMeasureSpec(
widthMeasureSpec, getPaddingStart() + getPaddingEnd(),
child.getLayoutParams().width),
exactHeightSpec);
}
}
mMatchParentViews.clear();
setMeasuredDimension(getMeasuredWidth(), height);
}
}
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