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


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 com.google.gwt.user.client.DOM;
19 import com.google.gwt.user.client.Event;
20
21 import java.util.ArrayList JavaDoc;
22 import java.util.Iterator JavaDoc;
23
24 /**
25  * A helper class for implementers of the SourcesMouseWheelEvents interface.
26  * This subclass of {@linkArrayList} assumes that all objects added to it will
27  * be of type {@link com.google.gwt.user.client.ui.MouseWheelListener}.
28  */
29 public class MouseWheelListenerCollection extends ArrayList JavaDoc {
30
31   /**
32    * Fires a mouse wheel event to all listeners.
33    *
34    * @param sender the widget sending the event
35    * @param velocity the velocity information for the event
36    */
37   public void fireMouseWheel(Widget sender, MouseWheelVelocity velocity) {
38
39     for (Iterator JavaDoc it = iterator(); it.hasNext();) {
40       MouseWheelListener listener = (MouseWheelListener) it.next();
41       listener.onMouseWheel(sender, velocity);
42     }
43   }
44
45   /**
46    * A helper for widgets that source mouse events.
47    *
48    * @param sender the widget sending the event
49    * @param event the {@link Event} received by the widget
50    */
51   public void fireMouseWheelEvent(Widget sender, Event event) {
52     if (DOM.eventGetType(event) == Event.ONMOUSEWHEEL) {
53       MouseWheelVelocity velocity = new MouseWheelVelocity(event);
54
55       fireMouseWheel(sender, velocity);
56     }
57   }
58 }
59
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