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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.android.systemui.statusbar;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.ImageView;
import com.android.systemui.R;
/**
* An ImageView which supports an attribute specifying whether it has overlapping rendering
* commands and therefore does not need a layer when alpha is changed.
*/
public class AlphaOptimizedImageView extends ImageView {
private final boolean mHasOverlappingRendering;
public AlphaOptimizedImageView(Context context) {
this(context, null /* attrs */);
}
public AlphaOptimizedImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0 /* defStyleAttr */);
}
public AlphaOptimizedImageView(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0 /* defStyleRes */);
}
public AlphaOptimizedImageView(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.AlphaOptimizedImageView, 0, 0);
try {
// Default to true, which is what View.java defaults to
mHasOverlappingRendering = a.getBoolean(
R.styleable.AlphaOptimizedImageView_hasOverlappingRendering, true);
} finally {
a.recycle();
}
}
@Override
public boolean hasOverlappingRendering() {
return mHasOverlappingRendering;
}
}
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