| /* |
| * 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 static com.google.gwt.dom.client.BrowserEvents.CLICK; |
| import static com.google.gwt.dom.client.BrowserEvents.KEYDOWN; |
| |
| import com.google.gwt.dom.client.Element; |
| import com.google.gwt.dom.client.EventTarget; |
| import com.google.gwt.dom.client.NativeEvent; |
| import com.google.gwt.safehtml.shared.SafeHtml; |
| import com.google.gwt.safehtml.shared.SafeHtmlBuilder; |
| import com.google.gwt.safehtml.shared.SafeHtmlUtils; |
| |
| /** |
| * A cell that renders a button and takes a delegate to perform actions on |
| * mouseUp. |
| * |
| * @param <C> the type that this Cell represents |
| */ |
| public class ActionCell<C> extends AbstractCell<C> { |
| |
| /** |
| * The delegate that will handle events from the cell. |
| * |
| * @param <T> the type that this delegate acts on |
| */ |
| public static interface Delegate<T> { |
| /** |
| * Perform the desired action on the given object. |
| * |
| * @param object the object to be acted upon |
| */ |
| void execute(T object); |
| } |
| |
| private final SafeHtml html; |
| private final Delegate<C> delegate; |
| |
| /** |
| * Construct a new {@link ActionCell}. |
| * |
| * @param message the message to display on the button |
| * @param delegate the delegate that will handle events |
| */ |
| public ActionCell(SafeHtml message, Delegate<C> delegate) { |
| super(CLICK, KEYDOWN); |
| this.delegate = delegate; |
| this.html = new SafeHtmlBuilder().appendHtmlConstant( |
| "<button type=\"button\" tabindex=\"-1\">").append(message).appendHtmlConstant( |
| "</button>").toSafeHtml(); |
| } |
| |
| /** |
| * Construct a new {@link ActionCell} with a text String that does not contain |
| * HTML markup. |
| * |
| * @param text the text to display on the button |
| * @param delegate the delegate that will handle events |
| */ |
| public ActionCell(String text, Delegate<C> delegate) { |
| this(SafeHtmlUtils.fromString(text), delegate); |
| } |
| |
| @Override |
| public void onBrowserEvent(Context context, Element parent, C value, |
| NativeEvent event, ValueUpdater<C> valueUpdater) { |
| super.onBrowserEvent(context, parent, value, event, valueUpdater); |
| if (CLICK.equals(event.getType())) { |
| EventTarget eventTarget = event.getEventTarget(); |
| if (!Element.is(eventTarget)) { |
| return; |
| } |
| if (parent.getFirstChildElement().isOrHasChild(Element.as(eventTarget))) { |
| // Ignore clicks that occur outside of the main element. |
| onEnterKeyDown(context, parent, value, event, valueUpdater); |
| } |
| } |
| } |
| |
| @Override |
| public void render(Context context, C value, SafeHtmlBuilder sb) { |
| sb.append(html); |
| } |
| |
| @Override |
| protected void onEnterKeyDown(Context context, Element parent, C value, |
| NativeEvent event, ValueUpdater<C> valueUpdater) { |
| delegate.execute(value); |
| } |
| } |