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Java > Open Source Codes > com > google > gwt > user > client > EventPreview


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;
17
18 /**
19  * A listener interface for previewing browser events.
20  *
21  * @see com.google.gwt.user.client.DOM#addEventPreview(EventPreview)
22  */
23 public interface EventPreview {
24
25   /**
26    * Called when a browser event occurs and this event preview is on top of the
27    * preview stack.
28    *
29    * @param event the browser event
30    * @return <code>false</code> to cancel the event
31    * @see DOM#addEventPreview(EventPreview)
32    */
33   boolean onEventPreview(Event event);
34 }
35
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