text: /****************************************************************************
  **
  ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
  ** Contact: http://www.qt-project.org/legal
  **
  ** This file is part of the QtGui module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 2.1 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.LGPL included in the
  ** packaging of this file.  Please review the following information to
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  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 3.0 as published by the Free Software
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  ** ensure the GNU General Public License version 3.0 requirements will be
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  ****************************************************************************/
  
  #ifndef QABSTRACTSCROLLAREA_P_H
  #define QABSTRACTSCROLLAREA_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "private/qframe_p.h"
  #include "qabstractscrollarea.h"
  
  QT_BEGIN_NAMESPACE
  
  #ifndef QT_NO_SCROLLAREA
  
  class QScrollBar;
  class QAbstractScrollAreaScrollBarContainer;
  class Q_GUI_EXPORT QAbstractScrollAreaPrivate: public QFramePrivate
  {
      Q_DECLARE_PUBLIC(QAbstractScrollArea)
  
  public:
      QAbstractScrollAreaPrivate();
  
      void replaceScrollBar(QScrollBar *scrollBar, Qt::Orientation orientation);
  
      QAbstractScrollAreaScrollBarContainer *scrollBarContainers[Qt::Vertical + 1];
      QScrollBar *hbar, *vbar;
      Qt::ScrollBarPolicy vbarpolicy, hbarpolicy;
  
      QWidget *viewport;
      QWidget *cornerWidget;
      QRect cornerPaintingRect;
  #ifdef Q_WS_MAC
      QRect reverseCornerPaintingRect;
  #endif
      int left, top, right, bottom; // viewport margin
  
      int xoffset, yoffset;
  
      void init();
      void layoutChildren();
      // ### Fix for 4.4, talk to Bjoern E or Girish.
      virtual void scrollBarPolicyChanged(Qt::Orientation, Qt::ScrollBarPolicy) {}
  
      void _q_hslide(int);
      void _q_vslide(int);
      void _q_showOrHideScrollBars();
  
      virtual QPoint contentsOffset() const;
  
      inline bool viewportEvent(QEvent *event)
      { return q_func()->viewportEvent(event); }
      QScopedPointer<QObject> viewportFilter;
  
  #ifdef Q_WS_WIN
      bool singleFingerPanEnabled;
      void setSingleFingerPanEnabled(bool on = true);
  #endif
  };
  
  class QAbstractScrollAreaFilter : public QObject
  {
      Q_OBJECT
  public:
      QAbstractScrollAreaFilter(QAbstractScrollAreaPrivate *p) : d(p)
      { setObjectName(QLatin1String("qt_abstractscrollarea_filter")); }
      bool eventFilter(QObject *o, QEvent *e)
      { return (o == d->viewport ? d->viewportEvent(e) : false); }
  private:
      QAbstractScrollAreaPrivate *d;
  };
  
  class QBoxLayout;
  class QAbstractScrollAreaScrollBarContainer : public QWidget
  {
  public:
      enum LogicalPosition { LogicalLeft = 1, LogicalRight = 2 };
  
      QAbstractScrollAreaScrollBarContainer(Qt::Orientation orientation, QWidget *parent);
      void addWidget(QWidget *widget, LogicalPosition position);
      QWidgetList widgets(LogicalPosition position);
      void removeWidget(QWidget *widget);
  
      QScrollBar *scrollBar;
      QBoxLayout *layout;
  private:
      int scrollBarLayoutIndex() const;
  
      Qt::Orientation orientation;
  };
  
  #endif // QT_NO_SCROLLAREA
  
  QT_END_NAMESPACE
  
  #endif // QABSTRACTSCROLLAREA_P_H
  