| /* |
| * 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.user.client.ui; |
| |
| /** |
| * Implemented by panels that have only one widget. |
| * |
| * @see SimplePanel |
| */ |
| public interface HasOneWidget extends AcceptsOneWidget { |
| |
| /** |
| * Gets the panel's child widget. |
| * |
| * @return the child widget, or <code>null</code> if none is present |
| */ |
| Widget getWidget(); |
| |
| /** |
| * Sets this panel's widget. Any existing child widget will be removed. |
| * |
| * @param w the panel's new widget, or <code>null</code> to clear the panel |
| */ |
| void setWidget(Widget w); |
| } |