com.google.gwt.user.client.ui.HasOneWidget.java Source code

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Here is the source code for com.google.gwt.user.client.ui.HasOneWidget.java

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/*
 * 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);
}