src/3rdparty/webkit/WebCore/platform/qt/WheelEventQt.cpp

   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 "PlatformWheelEvent.h"
  22
  23 #include "PlatformMouseEvent.h"
  24 #include "Scrollbar.h"
  25
  26 #include <qapplication.h>
  27 #include <QWheelEvent>
  28 #include <QGraphicsSceneWheelEvent>
  29
  30 namespace WebCore {
  31
  32 void PlatformWheelEvent::applyDelta(int delta, Qt::Orientation orientation)
  33 {
  34     if (orientation == Qt::Horizontal) {
  35         m_deltaX = (delta / 120.0f);
  36         m_deltaY = 0;
  37     } else {
  38         m_deltaX = 0;
  39         m_deltaY = (delta / 120.0f);
  40     }
  41
  42     m_wheelTicksX = m_deltaX;
  43     m_wheelTicksY = m_deltaY;
  44
  45     // Use the same single scroll step as QTextEdit
  46     // (in QTextEditPrivate::init [h,v]bar->setSingleStep)
  47     static const float cDefaultQtScrollStep = 20.f;
  48     m_deltaX *= QApplication::wheelScrollLines() * cDefaultQtScrollStep;
  49     m_deltaY *= QApplication::wheelScrollLines() * cDefaultQtScrollStep;
  50 }
  51
  52 PlatformWheelEvent::PlatformWheelEvent(QGraphicsSceneWheelEvent* e)
  53 #ifdef QT_NO_WHEELEVENT
  54 {
  55     Q_UNUSED(e);
  56 }
  57 #else
  58     : m_position(e->pos().toPoint())
  59     , m_globalPosition(e->screenPos())
  60     , m_granularity(ScrollByPixelWheelEvent)
  61     , m_isAccepted(false)
  62     , m_shiftKey(e->modifiers() & Qt::ShiftModifier)
  63     , m_ctrlKey(e->modifiers() & Qt::ControlModifier)
  64     , m_altKey(e->modifiers() & Qt::AltModifier)
  65     , m_metaKey(e->modifiers() & Qt::MetaModifier)
  66 {
  67     applyDelta(e->delta(), e->orientation());
  68 }
  69 #endif // QT_NO_WHEELEVENT
  70
  71 PlatformWheelEvent::PlatformWheelEvent(QWheelEvent* e)
  72 #ifdef QT_NO_WHEELEVENT
  73 {
  74     Q_UNUSED(e);
  75 }
  76 #else
  77     : m_position(e->pos())
  78     , m_globalPosition(e->globalPos())
  79     , m_granularity(ScrollByPixelWheelEvent)
  80     , m_isAccepted(false)
  81     , m_shiftKey(e->modifiers() & Qt::ShiftModifier)
  82     , m_ctrlKey(e->modifiers() & Qt::ControlModifier)
  83     , m_altKey(e->modifiers() & Qt::AltModifier)
  84     , m_metaKey(e->modifiers() & Qt::MetaModifier)
  85 {
  86     applyDelta(e->delta(), e->orientation());
  87 }
  88 #endif // QT_NO_WHEELEVENT
  89
  90 } // namespace WebCore