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


1 /*
2  * Copyright 2007 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.ArrayList JavaDoc;
19 import java.util.Iterator JavaDoc;
20
21 /**
22  * A helper class for implementers of the SourcesScrollEvents interface. This
23  * subclass of {@linkArrayList} assumes that all objects added to it will be of
24  * type {@link com.google.gwt.user.client.ui.ScrollListener}.
25  */
26 public class ScrollListenerCollection extends ArrayList JavaDoc {
27
28   /**
29    * Fires a scroll event to all listeners.
30    *
31    * @param sender the widget sending the event
32    * @param scrollLeft the horizontal scroll offset
33    * @param scrollTop the vertical scroll offset
34    */
35   public void fireScroll(Widget sender, int scrollLeft, int scrollTop) {
36     for (Iterator JavaDoc it = iterator(); it.hasNext();) {
37       ScrollListener listener = (ScrollListener) it.next();
38       listener.onScroll(sender, scrollLeft, scrollTop);
39     }
40   }
41 }
42
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