/////////////////////////////////////////////////////////////////////////////
// Name:        wx/gtk/scrolwin.h
// Purpose:     wxScrolledWindow class
// Author:      Robert Roebling
// Modified by: Vadim Zeitlin (2005-10-10): wxScrolledWindow is now common
// Created:     01/02/97
// RCS-ID:      $Id: scrolwin.h 43795 2006-12-04 11:05:59Z VZ $
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_GTK_SCROLLWIN_H_
#define _WX_GTK_SCROLLWIN_H_

// ----------------------------------------------------------------------------
// wxScrolledWindow
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxScrollHelperNative : public wxScrollHelper
{
public:
    // default ctor doesn't do anything
    wxScrollHelperNative(wxWindow *win) : wxScrollHelper(win) { }

    virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                               int noUnitsX, int noUnitsY,
                               int xPos = 0, int yPos = 0,
                               bool noRefresh = false);
    virtual void AdjustScrollbars();
    virtual void Scroll(int x, int y);

protected:
    // this does (each) half of AdjustScrollbars() work
    void DoAdjustScrollbar(GtkRange* range,
                           int pixelsPerLine,
                           int winSize,
                           int virtSize,
                           int *pos,
                           int *lines,
                           int *linesPerPage);

    void DoAdjustHScrollbar(int winSize, int virtSize)
    {
        DoAdjustScrollbar
        (
            m_win->m_scrollBar[wxWindow::ScrollDir_Horz],
            m_xScrollPixelsPerLine, winSize, virtSize,
            &m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage
        );
    }

    void DoAdjustVScrollbar(int winSize, int virtSize)
    {
        DoAdjustScrollbar
        (
            m_win->m_scrollBar[wxWindow::ScrollDir_Vert],
            m_yScrollPixelsPerLine, winSize, virtSize,
            &m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage
        );
    }

    // and this does the same for Scroll()
    void DoScroll(int orient,
                  int pos,
                  int pixelsPerLine,
                  int *posOld);

private:
    DECLARE_NO_COPY_CLASS(wxScrollHelperNative)
};

#endif // _WX_GTK_SCROLLWIN_H_