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Java > Open Source Codes > com > google > gwt > user > client > ui > TabListener


1 /*
2  * Copyright 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.user.client.ui;
17
18 import java.util.EventListener JavaDoc;
19
20 /**
21  * Event listener interface for tab events, used primarily by
22  * {@link com.google.gwt.user.client.ui.TabBar} and
23  * {@link com.google.gwt.user.client.ui.TabPanel}.
24  */
25 public interface TabListener extends EventListener JavaDoc {
26
27   /**
28    * Fired just before a tab is selected.
29    *
30    * @param sender the {@link TabBar} or {@link TabPanel} whose tab was
31    * selected.
32    * @param tabIndex the index of the tab about to be selected
33    * @return <code>false</code> to disallow the selection. If any listener
34    * returns false, then the selection will be disallowed.
35    */
36   boolean onBeforeTabSelected(SourcesTabEvents sender, int tabIndex);
37
38   /**
39    * Fired when a tab is selected.
40    *
41    * @param sender the {@link TabBar} or {@link TabPanel} whose tab was selected
42    * @param tabIndex the index of the tab that was selected
43    */
44   void onTabSelected(SourcesTabEvents sender, int tabIndex);
45 }
46
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