| /* |
| * 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.core.client.GWT; |
| import com.google.gwt.dom.client.BrowserEvents; |
| import com.google.gwt.dom.client.Element; |
| import com.google.gwt.dom.client.NativeEvent; |
| import com.google.gwt.dom.client.SelectElement; |
| import com.google.gwt.safehtml.client.SafeHtmlTemplates; |
| import com.google.gwt.safehtml.shared.SafeHtml; |
| import com.google.gwt.safehtml.shared.SafeHtmlBuilder; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| /** |
| * A {@link Cell} used to render a drop-down list. |
| */ |
| public class SelectionCell extends AbstractInputCell<String, String> { |
| |
| interface Template extends SafeHtmlTemplates { |
| @Template("<option value=\"{0}\">{0}</option>") |
| SafeHtml deselected(String option); |
| |
| @Template("<option value=\"{0}\" selected=\"selected\">{0}</option>") |
| SafeHtml selected(String option); |
| } |
| |
| private static Template template; |
| |
| 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(BrowserEvents.CHANGE); |
| if (template == null) { |
| template = GWT.create(Template.class); |
| } |
| this.options = new ArrayList<String>(options); |
| int index = 0; |
| for (String option : options) { |
| indexForOption.put(option, index++); |
| } |
| } |
| |
| @Override |
| public void onBrowserEvent(Context context, Element parent, String value, |
| NativeEvent event, ValueUpdater<String> valueUpdater) { |
| super.onBrowserEvent(context, parent, value, event, valueUpdater); |
| String type = event.getType(); |
| if (BrowserEvents.CHANGE.equals(type)) { |
| Object key = context.getKey(); |
| SelectElement select = parent.getFirstChild().cast(); |
| String newValue = options.get(select.getSelectedIndex()); |
| setViewData(key, newValue); |
| finishEditing(parent, newValue, key, valueUpdater); |
| if (valueUpdater != null) { |
| valueUpdater.update(newValue); |
| } |
| } |
| } |
| |
| @Override |
| public void render(Context context, String value, SafeHtmlBuilder sb) { |
| // Get the view data. |
| Object key = context.getKey(); |
| String viewData = getViewData(key); |
| if (viewData != null && viewData.equals(value)) { |
| clearViewData(key); |
| viewData = null; |
| } |
| |
| int selectedIndex = getSelectedIndex(viewData == null ? value : viewData); |
| sb.appendHtmlConstant("<select tabindex=\"-1\">"); |
| int index = 0; |
| for (String option : options) { |
| if (index++ == selectedIndex) { |
| sb.append(template.selected(option)); |
| } else { |
| sb.append(template.deselected(option)); |
| } |
| } |
| sb.appendHtmlConstant("</select>"); |
| } |
| |
| private int getSelectedIndex(String value) { |
| Integer index = indexForOption.get(value); |
| if (index == null) { |
| return -1; |
| } |
| return index.intValue(); |
| } |
| } |