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/* | |
* Copyright 2015 Google Inc. | |
* | |
* 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.behaviors; | |
import android.content.Context; | |
import android.content.res.TypedArray; | |
import android.support.design.widget.CoordinatorLayout; | |
import android.util.AttributeSet; | |
import android.view.ViewGroup; | |
import static android.view.View.MeasureSpec; | |
/** | |
* Behavior that imposes a maximum width on any ViewGroup. | |
* | |
* <p />Requires an attrs.xml of something like | |
* | |
* <pre> | |
* <declare-styleable name="MaxWidthBehavior_Params"> | |
* <attr name="behavior_maxWidth" format="dimension"/> | |
* </declare-styleable> | |
* </pre> | |
*/ | |
public class MaxWidthBehavior<V extends ViewGroup> extends CoordinatorLayout.Behavior<V> { | |
private int mMaxWidth; | |
public MaxWidthBehavior(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
TypedArray a = context.obtainStyledAttributes(attrs, | |
R.styleable.MaxWidthBehavior_Params); | |
mMaxWidth = a.getDimensionPixelSize( | |
R.styleable.MaxWidthBehavior_Params_behavior_maxWidth, 0); | |
a.recycle(); | |
} | |
@Override | |
public boolean onMeasureChild(CoordinatorLayout parent, V child, | |
int parentWidthMeasureSpec, int widthUsed, | |
int parentHeightMeasureSpec, int heightUsed) { | |
if (mMaxWidth <= 0) { | |
// No max width means this Behavior is a no-op | |
return false; | |
} | |
int widthMode = MeasureSpec.getMode(parentWidthMeasureSpec); | |
int width = MeasureSpec.getSize(parentWidthMeasureSpec); | |
if (widthMode == MeasureSpec.UNSPECIFIED || width > mMaxWidth) { | |
// Sorry to impose here, but max width is kind of a big deal | |
width = mMaxWidth; | |
widthMode = MeasureSpec.AT_MOST; | |
parent.onMeasureChild(child, | |
MeasureSpec.makeMeasureSpec(width, widthMode), widthUsed, | |
parentHeightMeasureSpec, heightUsed); | |
// We've measured the View, so CoordinatorLayout doesn't have to | |
return true; | |
} | |
// Looks like the default measurement will work great | |
return false; | |
} | |
} |
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