01: /*
02: * Copyright 2007 Google Inc.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License"); you may not
05: * use this file except in compliance with the License. You may obtain a copy of
06: * the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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;
22:
23: /**
24: * A helper class for implementers of the SourcesMouseWheelEvents interface.
25: * This subclass of {@link ArrayList} assumes that all objects added to it will
26: * be of type {@link com.google.gwt.user.client.ui.MouseWheelListener}.
27: */
28: public class MouseWheelListenerCollection extends
29: ArrayList<MouseWheelListener> {
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,
38: MouseWheelVelocity velocity) {
39: for (MouseWheelListener listener : this ) {
40: listener.onMouseWheel(sender, velocity);
41: }
42: }
43:
44: /**
45: * A helper for widgets that source mouse events.
46: *
47: * @param sender the widget sending the event
48: * @param event the {@link Event} received by the widget
49: */
50: public void fireMouseWheelEvent(Widget sender, Event event) {
51: if (DOM.eventGetType(event) == Event.ONMOUSEWHEEL) {
52: MouseWheelVelocity velocity = new MouseWheelVelocity(event);
53: fireMouseWheel(sender, velocity);
54: }
55: }
56: }
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