1 /*
2 Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
3
4 This library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public
6 License as published by the Free Software Foundation; either
7 version 2 of the License, or (at your option) any later version.
8
9 This library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public License
15 along with this library; see the file COPYING.LIB. If not, write to
16 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 Boston, MA 02110-1301, USA.
18 */
19
20 #include "config.h"
21 #include "WheelEvent.h"
22
23 #include "PlatformMouseEvent.h"
24 #include "PlatformWheelEvent.h"
25 #include "Scrollbar.h"
26
27 #include <QGraphicsSceneWheelEvent>
28 #include <QWheelEvent>
29 #include <qapplication.h>
30
31 namespace WebCore {
32
applyDelta(int delta,Qt::Orientation orientation)33 void PlatformWheelEvent::applyDelta(int delta, Qt::Orientation orientation)
34 {
35 // A delta that is not mod 120 indicates a device that is sending
36 // fine-resolution scroll events, so use the delta as number of wheel ticks
37 // and number of pixels to scroll.See also webkit.org/b/29601
38 bool fullTick = !(delta % 120);
39
40 if (orientation == Qt::Horizontal) {
41 m_deltaX = (fullTick) ? delta / 120.0f : delta;
42 m_deltaY = 0;
43 } else {
44 m_deltaX = 0;
45 m_deltaY = (fullTick) ? delta / 120.0f : delta;
46 }
47
48 m_wheelTicksX = m_deltaX;
49 m_wheelTicksY = m_deltaY;
50
51 #ifndef QT_NO_WHEELEVENT
52 // Use the same single scroll step as QTextEdit
53 // (in QTextEditPrivate::init [h,v]bar->setSingleStep)
54 static const float cDefaultQtScrollStep = 20.f;
55 m_deltaX *= (fullTick) ? QApplication::wheelScrollLines() * cDefaultQtScrollStep : 1;
56 m_deltaY *= (fullTick) ? QApplication::wheelScrollLines() * cDefaultQtScrollStep : 1;
57 #endif
58 }
59
PlatformWheelEvent(QGraphicsSceneWheelEvent * e)60 PlatformWheelEvent::PlatformWheelEvent(QGraphicsSceneWheelEvent* e)
61 #ifndef QT_NO_WHEELEVENT
62 : m_position(e->pos().toPoint())
63 , m_globalPosition(e->screenPos())
64 , m_granularity(ScrollByPixelWheelEvent)
65 , m_isAccepted(false)
66 , m_shiftKey(e->modifiers() & Qt::ShiftModifier)
67 , m_ctrlKey(e->modifiers() & Qt::ControlModifier)
68 , m_altKey(e->modifiers() & Qt::AltModifier)
69 , m_metaKey(e->modifiers() & Qt::MetaModifier)
70 #endif
71 {
72 #ifndef QT_NO_WHEELEVENT
73 applyDelta(e->delta(), e->orientation());
74 #else
75 Q_UNUSED(e);
76 #endif
77 }
78
PlatformWheelEvent(QWheelEvent * e)79 PlatformWheelEvent::PlatformWheelEvent(QWheelEvent* e)
80 #ifndef QT_NO_WHEELEVENT
81 : m_position(e->pos())
82 , m_globalPosition(e->globalPos())
83 , m_granularity(ScrollByPixelWheelEvent)
84 , m_isAccepted(false)
85 , m_shiftKey(e->modifiers() & Qt::ShiftModifier)
86 , m_ctrlKey(e->modifiers() & Qt::ControlModifier)
87 , m_altKey(e->modifiers() & Qt::AltModifier)
88 , m_metaKey(e->modifiers() & Qt::MetaModifier)
89 #endif
90 {
91 #ifndef QT_NO_WHEELEVENT
92 applyDelta(e->delta(), e->orientation());
93 #else
94 Q_UNUSED(e);
95 #endif
96 }
97
98 } // namespace WebCore
99