1/*
2 * Copyright (C) 2006 Apple 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 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 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
31#include "FloatPoint.h"
32#include "GtkUtilities.h"
33#include "PlatformKeyboardEvent.h"
34#include "Scrollbar.h"
35#include <gdk/gdk.h>
36#include <gtk/gtk.h>
37#include <wtf/WallTime.h>
38
39namespace WebCore {
40
41// Keep this in sync with the other platform event constructors
42PlatformWheelEvent::PlatformWheelEvent(GdkEventScroll* event)
43{
44 static const float delta = 1;
45
46 m_type = PlatformEvent::Wheel;
47 m_timestamp = wallTimeForEvent(event);
48
49 if (event->state & GDK_SHIFT_MASK)
50 m_modifiers.add(Modifier::ShiftKey);
51 if (event->state & GDK_CONTROL_MASK)
52 m_modifiers.add(Modifier::ControlKey);
53 if (event->state & GDK_MOD1_MASK)
54 m_modifiers.add(Modifier::AltKey);
55 if (event->state & GDK_META_MASK)
56 m_modifiers.add(Modifier::MetaKey);
57 if (PlatformKeyboardEvent::modifiersContainCapsLock(event->state))
58 m_modifiers.add(PlatformEvent::Modifier::CapsLockKey);
59
60 m_deltaX = 0;
61 m_deltaY = 0;
62
63 // Docs say an upwards scroll (away from the user) has a positive delta
64 switch (event->direction) {
65 case GDK_SCROLL_UP:
66 m_deltaY = delta;
67 break;
68 case GDK_SCROLL_DOWN:
69 m_deltaY = -delta;
70 break;
71 case GDK_SCROLL_LEFT:
72 m_deltaX = delta;
73 break;
74 case GDK_SCROLL_RIGHT:
75 m_deltaX = -delta;
76 break;
77#if GTK_CHECK_VERSION(3, 3, 18)
78 case GDK_SCROLL_SMOOTH: {
79 gdouble deltaX, deltaY;
80 gdk_event_get_scroll_deltas(reinterpret_cast<GdkEvent*>(event), &deltaX, &deltaY);
81 m_deltaX = -deltaX;
82 m_deltaY = -deltaY;
83 }
84 break;
85#endif
86 }
87 m_wheelTicksX = m_deltaX;
88 m_wheelTicksY = m_deltaY;
89
90#if ENABLE(ASYNC_SCROLLING)
91#ifndef GTK_API_VERSION_2
92#if GTK_CHECK_VERSION(3, 20, 0)
93 m_phase = event->is_stop ?
94 PlatformWheelEventPhaseEnded :
95 PlatformWheelEventPhaseChanged;
96#else
97 m_phase = event->direction == GDK_SCROLL_SMOOTH && !m_deltaX && !m_deltaY ?
98 PlatformWheelEventPhaseEnded :
99 PlatformWheelEventPhaseChanged;
100#endif
101#else
102 m_phase = PlatformWheelEventPhaseChanged;
103#endif // GTK_API_VERSION_2
104#endif // ENABLE(ASYNC_SCROLLING)
105
106 m_position = IntPoint(static_cast<int>(event->x), static_cast<int>(event->y));
107 m_globalPosition = IntPoint(static_cast<int>(event->x_root), static_cast<int>(event->y_root));
108 m_granularity = ScrollByPixelWheelEvent;
109 m_directionInvertedFromDevice = false;
110
111 // FIXME: retrieve the user setting for the number of lines to scroll on each wheel event
112 m_deltaX *= static_cast<float>(Scrollbar::pixelsPerLineStep());
113 m_deltaY *= static_cast<float>(Scrollbar::pixelsPerLineStep());
114}
115
116} // namespace WebCore
117