Created
July 7, 2014 10:15
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SquareFrameLayout (这个版本的测量考虑更全面)
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/* | |
* Copyright (C) 2014 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.example.android.activityscenetransitionbasic; | |
import android.content.Context; | |
import android.util.AttributeSet; | |
import android.widget.FrameLayout; | |
/** | |
* {@link android.widget.FrameLayout} which forces itself to be laid out as square. | |
*/ | |
public class SquareFrameLayout extends FrameLayout { | |
public SquareFrameLayout(Context context) { | |
super(context); | |
} | |
public SquareFrameLayout(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
} | |
public SquareFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) { | |
super(context, attrs, defStyleAttr); | |
} | |
public SquareFrameLayout(Context context, AttributeSet attrs, | |
int defStyleAttr, int defStyleRes) { | |
super(context, attrs, defStyleAttr, defStyleRes); | |
} | |
@Override | |
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | |
final int widthSize = MeasureSpec.getSize(widthMeasureSpec); | |
final int heightSize = MeasureSpec.getSize(heightMeasureSpec); | |
if (widthSize == 0 && heightSize == 0) { | |
// If there are no constraints on size, let FrameLayout measure | |
super.onMeasure(widthMeasureSpec, heightMeasureSpec); | |
// Now use the smallest of the measured dimensions for both dimensions | |
final int minSize = Math.min(getMeasuredWidth(), getMeasuredHeight()); | |
setMeasuredDimension(minSize, minSize); | |
return; | |
} | |
final int size; | |
if (widthSize == 0 || heightSize == 0) { | |
// If one of the dimensions has no restriction on size, set both dimensions to be the | |
// on that does | |
size = Math.max(widthSize, heightSize); | |
} else { | |
// Both dimensions have restrictions on size, set both dimensions to be the | |
// smallest of the two | |
size = Math.min(widthSize, heightSize); | |
} | |
final int newMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.EXACTLY); | |
super.onMeasure(newMeasureSpec, newMeasureSpec); | |
} | |
} |
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