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/*
* Copyright (C) 2015 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.packageinstaller.permission.ui;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.FrameLayout;
/**
* Allows one standard layout pass, but afterwards holds getMeasuredHeight constant,
* however still allows drawing larger at the size needed by its children. This allows
* a dialog to tell the window the height is constant (with keeps its position constant)
* but allows the view to grow downwards for animation.
*/
public class ManualLayoutFrame extends FrameLayout {
private int mDesiredHeight;
private int mHeight;
private int mWidth;
public ManualLayoutFrame(Context context, AttributeSet attrs) {
super(context, attrs);
setClipChildren(false);
setClipToPadding(false);
}
public int getLayoutHeight() {
return mDesiredHeight;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mWidth != 0) {
int newWidth = mWidth;
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
switch (widthMode) {
case MeasureSpec.AT_MOST: {
newWidth = Math.min(mWidth, MeasureSpec.getSize(widthMeasureSpec));
} break;
case MeasureSpec.EXACTLY: {
newWidth = MeasureSpec.getSize(widthMeasureSpec);
} break;
}
// If the width changes we have to re-evaluate the height
if (newWidth != mWidth) {
mWidth = newWidth;
mHeight = 0;
}
widthMeasureSpec = MeasureSpec.makeMeasureSpec(mWidth, MeasureSpec.EXACTLY);
}
// Let the content measure how much it needs to be fully shown
heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mDesiredHeight = getMeasuredHeight();
if (mHeight == 0 && mDesiredHeight != 0) {
// Record the first non-zero width and height, this will be the height henceforth.
mHeight = mDesiredHeight;
mWidth = getMeasuredWidth();
}
if (mHeight != 0) {
// Always report the same height
setMeasuredDimension(getMeasuredWidth(), mHeight);
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (mDesiredHeight != 0) {
// Draw at height we expect to be.
setBottom(getTop() + mDesiredHeight);
bottom = top + mDesiredHeight;
}
super.onLayout(changed, left, top, right, bottom);
}
}
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