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
  29 namespace WebCore {
  30
  31
  32 PlatformWheelEvent::PlatformWheelEvent(QWheelEvent* e)
  33 #ifdef QT_NO_WHEELEVENT
  34 {
  35     Q_UNUSED(e);
  36 }
  37 #else
  38     : m_position(e->pos())
  39     , m_globalPosition(e->globalPos())
  40 #ifdef QT_MAC_USE_COCOA
  41     , m_granularity(ScrollByPixelWheelEvent)
  42 #else
  43     , m_granularity(ScrollByLineWheelEvent)
  44 #endif
  45     , m_isAccepted(false)
  46     , m_shiftKey(e->modifiers() & Qt::ShiftModifier)
  47     , m_ctrlKey(e->modifiers() & Qt::ControlModifier)
  48     , m_altKey(e->modifiers() & Qt::AltModifier)
  49     , m_metaKey(e->modifiers() & Qt::MetaModifier)
  50 {
  51     if (e->orientation() == Qt::Horizontal) {
  52         m_deltaX = (e->delta() / 120);
  53         m_deltaY = 0;
  54     } else {
  55         m_deltaX = 0;
  56         m_deltaY = (e->delta() / 120);
  57     }
  58
  59     m_deltaX *= QApplication::wheelScrollLines();
  60     // use the same single scroll step as QTextEdit (in
  61     // QTextEditPrivate::init [h,v]bar->setSingleStep )
  62     // and divide by the default WebKit scroll step to
  63     // get the Qt mouse wheel scroll behavior
  64     static const float cDefaultQtScrollStep = 20.f;
  65     m_deltaY *= QApplication::wheelScrollLines() *
  66                 (cDefaultQtScrollStep / cMouseWheelPixelsPerLineStep);
  67 }
  68 #endif // QT_NO_WHEELEVENT
  69
  70 } // namespace WebCore