57 lines
1.8 KiB
Java
57 lines
1.8 KiB
Java
/*
|
|
* Copyright (C) 2015 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.messaging.datamodel.binding;
|
|
|
|
import com.android.messaging.util.Assert;
|
|
|
|
/**
|
|
* An extension on {@link Binding} that allows for temporary data detachment from the UI component.
|
|
* This is used when, instead of destruction or data rebinding, the owning UI undergoes a
|
|
* "detached from window" -> "re-attached to window" transition, in which case we want to
|
|
* temporarily unbind the data and remember it so that it can be rebound when the UI is re-attached
|
|
* to window later.
|
|
*/
|
|
public class DetachableBinding<T extends BindableData> extends Binding<T> {
|
|
private T mDetachedData;
|
|
|
|
DetachableBinding(Object owner) {
|
|
super(owner);
|
|
}
|
|
|
|
@Override
|
|
public void bind(T data) {
|
|
super.bind(data);
|
|
// Rebinding before re-attaching. Pre-emptively throw away the detached data because
|
|
// it's now stale.
|
|
mDetachedData = null;
|
|
}
|
|
|
|
public void detach() {
|
|
Assert.isNull(mDetachedData);
|
|
Assert.isTrue(isBound());
|
|
mDetachedData = getData();
|
|
unbind();
|
|
}
|
|
|
|
public void reAttachIfPossible() {
|
|
if (mDetachedData != null) {
|
|
Assert.isFalse(isBound());
|
|
bind(mDetachedData);
|
|
mDetachedData = null;
|
|
}
|
|
}
|
|
}
|