| /* |
| * 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.cell.client; |
| |
| import com.google.gwt.dom.client.Element; |
| import com.google.gwt.dom.client.NativeEvent; |
| import com.google.gwt.dom.client.SelectElement; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| /** |
| * A {@link Cell} used to render a drop-down list. |
| * |
| * <p> |
| * Note: This class is new and its interface subject to change. |
| * </p> |
| */ |
| public class SelectionCell extends AbstractEditableCell<String, String> { |
| |
| private HashMap<String, Integer> indexForOption = new HashMap< |
| String, Integer>(); |
| private final List<String> options; |
| |
| /** |
| * Construct a new {@link SelectionCell} with the specified options. |
| * |
| * @param options the options in the cell |
| */ |
| public SelectionCell(List<String> options) { |
| super("change"); |
| this.options = new ArrayList<String>(options); |
| int index = 0; |
| for (String option : options) { |
| indexForOption.put(option, index++); |
| } |
| } |
| |
| @Override |
| public void onBrowserEvent(Element parent, String value, Object key, |
| NativeEvent event, ValueUpdater<String> valueUpdater) { |
| String type = event.getType(); |
| if ("change".equals(type)) { |
| SelectElement select = parent.getFirstChild().cast(); |
| String newValue = options.get(select.getSelectedIndex()); |
| setViewData(key, newValue); |
| if (valueUpdater != null) { |
| valueUpdater.update(newValue); |
| } |
| } |
| } |
| |
| @Override |
| public void render(String value, Object key, StringBuilder sb) { |
| // Get the view data. |
| String viewData = getViewData(key); |
| if (viewData != null && viewData.equals(value)) { |
| clearViewData(key); |
| viewData = null; |
| } |
| |
| int selectedIndex = getSelectedIndex(viewData == null ? value : viewData); |
| sb.append("<select>"); |
| int index = 0; |
| for (String option : options) { |
| sb.append("<option value='").append(option).append("'"); |
| if (index++ == selectedIndex) { |
| sb.append(" selected='selected'"); |
| } |
| sb.append(">"); |
| sb.append(option); |
| sb.append("</option>"); |
| } |
| sb.append("</select>"); |
| } |
| |
| private int getSelectedIndex(String value) { |
| Integer index = indexForOption.get(value); |
| if (index == null) { |
| return -1; |
| } |
| return index.intValue(); |
| } |
| } |