1 /*
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
3 * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "config.h"
29 #include "PlatformWheelEvent.h"
30 #include "Scrollbar.h"
31
32 #include <gdk/gdk.h>
33
34 namespace WebCore {
35
36 // Keep this in sync with the other platform event constructors
PlatformWheelEvent(GdkEventScroll * event)37 PlatformWheelEvent::PlatformWheelEvent(GdkEventScroll* event)
38 {
39 static const float delta = 1;
40
41 m_deltaX = 0;
42 m_deltaY = 0;
43
44 // Docs say an upwards scroll (away from the user) has a positive delta
45 switch (event->direction) {
46 case GDK_SCROLL_UP:
47 m_deltaY = delta;
48 break;
49 case GDK_SCROLL_DOWN:
50 m_deltaY = -delta;
51 break;
52 case GDK_SCROLL_LEFT:
53 m_deltaX = delta;
54 break;
55 case GDK_SCROLL_RIGHT:
56 m_deltaX = -delta;
57 break;
58 }
59 m_wheelTicksX = m_deltaX;
60 m_wheelTicksY = m_deltaY;
61
62 m_position = IntPoint(static_cast<int>(event->x), static_cast<int>(event->y));
63 m_globalPosition = IntPoint(static_cast<int>(event->x_root), static_cast<int>(event->y_root));
64 m_granularity = ScrollByPixelWheelEvent;
65 m_isAccepted = false;
66 m_shiftKey = event->state & GDK_SHIFT_MASK;
67 m_ctrlKey = event->state & GDK_CONTROL_MASK;
68 m_altKey = event->state & GDK_MOD1_MASK;
69 m_metaKey = event->state & GDK_META_MASK;
70
71 // FIXME: retrieve the user setting for the number of lines to scroll on each wheel event
72 m_deltaX *= static_cast<float>(cScrollbarPixelsPerLineStep);
73 m_deltaY *= static_cast<float>(cScrollbarPixelsPerLineStep);
74 }
75
76 }
77