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package com.bumptech.glide.load.resource.drawable;
import android.graphics.drawable.Drawable;
import com.bumptech.glide.load.engine.Resource;
/**
* Simple wrapper for an Android {@link Drawable} which returns a
* {@link android.graphics.drawable.Drawable.ConstantState#newDrawable() new drawable}
* based on it's {@link android.graphics.drawable.Drawable.ConstantState state}.
*
* <b>Suggested usages only include {@code T}s where the new drawable is of the same or descendant class.</b>
*
* @param <T> type of the wrapped {@link Drawable}
*/
public abstract class DrawableResource<T extends Drawable> implements Resource<T> {
protected final T drawable;
private boolean returnedOriginalDrawable;
public DrawableResource(T drawable) {
this.drawable = drawable;
}
@SuppressWarnings("unchecked")
// drawables should always return a copy of the same class
@Override
public final T get() {
if (!returnedOriginalDrawable) {
returnedOriginalDrawable = true;
return drawable;
} else {
return (T) drawable.getConstantState().newDrawable();
}
}
}
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