| /* |
| * 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 <T> the record data type |
| */ |
| public class NoSelectionModel<T> extends AbstractSelectionModel<T> { |
| |
| 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<T>, or null if the item |
| * should act as its own key |
| */ |
| public NoSelectionModel(ProvidesKey<T> 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(); |
| } |
| } |