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/*
* Copyright (C) 2013 Square, 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.squareup.picasso;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import java.lang.ref.WeakReference;
class DeferredRequestCreator implements ViewTreeObserver.OnPreDrawListener {
final RequestCreator creator;
final WeakReference<ImageView> target;
Callback callback;
DeferredRequestCreator(RequestCreator creator, ImageView target, Callback callback) {
this.creator = creator;
this.target = new WeakReference<ImageView>(target);
this.callback = callback;
target.getViewTreeObserver().addOnPreDrawListener(this);
}
@Override public boolean onPreDraw() {
ImageView target = this.target.get();
if (target == null) {
return true;
}
ViewTreeObserver vto = target.getViewTreeObserver();
if (!vto.isAlive()) {
return true;
}
int width = target.getMeasuredWidth();
int height = target.getMeasuredHeight();
if (width <= 0 || height <= 0) {
return true;
}
vto.removeOnPreDrawListener(this);
this.creator.unfit().resize(width, height).into(target, callback);
return true;
}
void cancel() {
callback = null;
ImageView target = this.target.get();
if (target == null) {
return;
}
ViewTreeObserver vto = target.getViewTreeObserver();
if (!vto.isAlive()) {
return;
}
vto.removeOnPreDrawListener(this);
}
}
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