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/*
* Copyright (C) 2013 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.bitmap.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.ImageView;
import com.android.bitmap.drawable.BasicBitmapDrawable;
/**
* A helpful ImageView replacement that can generally be used in lieu of ImageView.
* BitmapDrawableImageView has logic to unbind its BasicBitmapDrawable when it is detached from the
* window.
*/
public class BitmapDrawableImageView extends ImageView {
private static final boolean hasTransientStateSupported =
Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
private BasicBitmapDrawable mDrawable;
private boolean mAttachedToWindow;
public BitmapDrawableImageView(final Context context) {
this(context, null);
}
public BitmapDrawableImageView(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public BitmapDrawableImageView(final Context context, final AttributeSet attrs,
final int defStyle) {
super(context, attrs, defStyle);
}
/**
* Get the source drawable for this BitmapDrawableImageView.
* @return The source drawable casted to the given type, or null if the type does not match.
*/
@SuppressWarnings("unchecked") // Cast to type parameter.
public <E extends BasicBitmapDrawable> E getTypedDrawable() {
try {
return (E) mDrawable;
} catch (Exception ignored) {
return null;
}
}
/**
* Set the given drawable as the source for this BitmapDrawableImageView.
* @param drawable The source drawable.
*/
public <E extends BasicBitmapDrawable> void setTypedDrawable(E drawable) {
super.setImageDrawable(drawable);
unbindDrawable();
mDrawable = drawable;
}
private void unbindDrawable() {
if (mDrawable != null) {
mDrawable.unbind();
}
}
@Override
public void setImageResource(final int resId) {
super.setImageResource(resId);
unbindDrawable();
mDrawable = null;
}
@Override
public void setImageURI(final Uri uri) {
super.setImageURI(uri);
unbindDrawable();
mDrawable = null;
}
@Override
public void setImageDrawable(final Drawable drawable) {
super.setImageDrawable(drawable);
unbindDrawable();
mDrawable = null;
}
@Override
public void setImageBitmap(final Bitmap bm) {
super.setImageBitmap(bm);
unbindDrawable();
mDrawable = null;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mAttachedToWindow = true;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mAttachedToWindow = false;
if (hasTransientStateSupported && !hasTransientState()) {
unbindDrawable();
}
}
@Override
public void setHasTransientState(boolean hasTransientState) {
super.setHasTransientState(hasTransientState);
if (!hasTransientState && !mAttachedToWindow) {
unbindDrawable();
}
}
}
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