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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2015 (C) Scott Jackson
*/
package github.daneren2005.dsub.view;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.ImageView;
public class RecyclingImageView extends ImageView {
private boolean invalidated = false;
private OnInvalidated onInvalidated;
public RecyclingImageView(Context context) {
super(context);
}
public RecyclingImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RecyclingImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public RecyclingImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void onDraw(Canvas canvas) {
Drawable drawable = this.getDrawable();
if(drawable != null) {
if(drawable instanceof BitmapDrawable) {
if (isBitmapRecycled(drawable)) {
this.setImageDrawable(null);
setInvalidated(true);
}
} else if(drawable instanceof TransitionDrawable) {
TransitionDrawable transitionDrawable = (TransitionDrawable) drawable;
// If last bitmap in chain is recycled, just blank this out since it would be invalid anyways
Drawable lastDrawable = transitionDrawable.getDrawable(transitionDrawable.getNumberOfLayers() - 1);
if(isBitmapRecycled(lastDrawable)) {
this.setImageDrawable(null);
setInvalidated(true);
} else {
// Go through earlier bitmaps and make sure that they are not recycled
for (int i = 0; i < transitionDrawable.getNumberOfLayers(); i++) {
Drawable layerDrawable = transitionDrawable.getDrawable(i);
if (isBitmapRecycled(layerDrawable)) {
// If anything in the chain is broken, just get rid of transition and go to last drawable
this.setImageDrawable(lastDrawable);
break;
}
}
}
}
}
super.onDraw(canvas);
}
@Override
public void setImageDrawable(Drawable drawable) {
super.setImageDrawable(drawable);
setInvalidated(false);
}
private boolean isBitmapRecycled(Drawable drawable) {
if(!(drawable instanceof BitmapDrawable)) {
return false;
}
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
if (bitmapDrawable.getBitmap() != null && bitmapDrawable.getBitmap().isRecycled()) {
return true;
} else {
return false;
}
}
public void setInvalidated(boolean invalidated) {
this.invalidated = invalidated;
if(invalidated && onInvalidated != null) {
onInvalidated.onInvalidated(this);
}
}
public boolean isInvalidated() {
return invalidated;
}
public void setOnInvalidated(OnInvalidated onInvalidated) {
this.onInvalidated = onInvalidated;
}
public interface OnInvalidated {
void onInvalidated(RecyclingImageView imageView);
}
}
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