com.google.gwt.view.client.NoSelectionModel Maven / Gradle / Ivy
/*
* Copyright 2010 Google 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.google.gwt.view.client;
import com.google.gwt.view.client.SelectionModel.AbstractSelectionModel;
/**
* A selection model that does not allow selection, but fires selection change
* events. Use this model if you want to know when a user selects an item, but
* do not want the view to update based on the selection.
*
* @param the record data type
*/
public class NoSelectionModel extends AbstractSelectionModel {
private Object lastKey;
private T lastSelection;
/**
* Constructs a NoSelectionModel without a key provider.
*/
public NoSelectionModel() {
super(null);
}
/**
* Constructs a NoSelectionModel with the given key provider.
*
* @param keyProvider an instance of ProvidesKey, or null if the item
* should act as its own key
*/
public NoSelectionModel(ProvidesKey keyProvider) {
super(keyProvider);
}
/**
* Gets the item that was last selected.
*
* @return the last selected item
*/
public T getLastSelectedObject() {
return lastSelection;
}
@Override
public boolean isSelected(T item) {
return false;
}
@Override
public void setSelected(T item, boolean selected) {
Object key = getKey(item);
if (selected) {
lastSelection = item;
lastKey = key;
} else if (lastKey != null && lastKey.equals(key)) {
lastSelection = null;
lastKey = null;
}
scheduleSelectionChangeEvent();
}
}