src/generic/scrolwin.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        scrolwin.cpp
// Purpose:     wxScrolledWindow implementation
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:   	wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation
#pragma implementation "scrolwin.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#include "wx/utils.h"
#include "wx/dcclient.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/generic/scrolwin.h"
#include "wx/panel.h"

BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
    EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
    EVT_SIZE(wxScrolledWindow::OnSize)
    EVT_PAINT(wxScrolledWindow::OnPaint)
END_EVENT_TABLE()

IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)

#ifdef __WXMSW__
#include "windows.h"
#endif

#ifdef __WXMOTIF__
// For wxRETAINED implementation
#ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
               //This code switches off the compiler warnings
# pragma message disable nosimpint
#endif
#include <Xm/Xm.h>
#ifdef __VMS__
# pragma message enable nosimpint
#endif
#endif

wxScrolledWindow::wxScrolledWindow()
{
    m_xScrollPixelsPerLine = 0;
    m_yScrollPixelsPerLine = 0;
    m_xScrollingEnabled = TRUE;
    m_yScrollingEnabled = TRUE;
    m_xScrollPosition = 0;
    m_yScrollPosition = 0;
    m_xScrollLines = 0;
    m_yScrollLines = 0;
    m_xScrollLinesPerPage = 0;
    m_yScrollLinesPerPage = 0;
    m_scaleX = 1.0;
    m_scaleY = 1.0;
}

bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
           const wxPoint& pos,
           const wxSize& size,
           long style,
           const wxString& name)
{
    m_xScrollPixelsPerLine = 0;
    m_yScrollPixelsPerLine = 0;
    m_xScrollingEnabled = TRUE;
    m_yScrollingEnabled = TRUE;
    m_xScrollPosition = 0;
    m_yScrollPosition = 0;
    m_xScrollLines = 0;
    m_yScrollLines = 0;
    m_xScrollLinesPerPage = 0;
    m_yScrollLinesPerPage = 0;
    m_scaleX = 1.0;
    m_scaleY = 1.0;

    m_targetWindow = this;

    return wxPanel::Create(parent, id, pos, size, style, name);
}

/*
 * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 * noUnitsX/noUnitsY:        : no. units per scrollbar
 */
void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
	       int noUnitsX, int noUnitsY,
	       int xPos, int yPos, bool noRefresh )
{
    bool do_refresh =
    (
      (noUnitsX != 0 && m_xScrollLines == 0) ||
      (noUnitsX < m_xScrollLines) ||
      (noUnitsY != 0 && m_yScrollLines == 0) ||
      (noUnitsY < m_yScrollLines) ||
      (xPos != m_xScrollPosition) ||
      (yPos != m_yScrollPosition) ||
      (pixelsPerUnitX != m_xScrollPixelsPerLine) ||
      (pixelsPerUnitY != m_yScrollPixelsPerLine)
    );

    m_xScrollPixelsPerLine = pixelsPerUnitX;
    m_yScrollPixelsPerLine = pixelsPerUnitY;
    m_xScrollPosition = xPos;
    m_yScrollPosition = yPos;
    m_xScrollLines = noUnitsX;
    m_yScrollLines = noUnitsY;

#ifdef __WXMOTIF__
    // Sorry, some Motif-specific code to implement a backing pixmap
    // for the wxRETAINED style. Implementing a backing store can't
    // be entirely generic because it relies on the wxWindowDC implementation
    // to duplicate X drawing calls for the backing pixmap.

    if ((m_windowStyle & wxRETAINED) == wxRETAINED)
    {
        Display* dpy = XtDisplay((Widget) GetMainWidget());

        int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
        int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
        if (m_backingPixmap &&
           !((m_pixmapWidth == totalPixelWidth) &&
             (m_pixmapHeight == totalPixelHeight)))
        {
            XFreePixmap (dpy, (Pixmap) m_backingPixmap);
            m_backingPixmap = (WXPixmap) 0;
        }

        if (!m_backingPixmap &&
           (noUnitsX != 0) && (noUnitsY != 0))
        {
            int depth = wxDisplayDepth();
            m_pixmapWidth = totalPixelWidth;
            m_pixmapHeight = totalPixelHeight;
            m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
            m_pixmapWidth, m_pixmapHeight, depth);
	}

    }
#endif

    AdjustScrollbars();

    if (do_refresh && !noRefresh)
	m_targetWindow->Refresh();

#ifdef __WXMSW__
   // Necessary?
    UpdateWindow ((HWND) m_targetWindow->GetHWND());
#endif
#ifdef __WXMAC__
		m_targetWindow->MacUpdateImmediately() ;
#endif
}

wxScrolledWindow::~wxScrolledWindow()
{
}

void wxScrolledWindow::SetTargetWindow( wxWindow *target )
{
    wxASSERT_MSG( target, wxT("target window must not be NULL") );
    m_targetWindow = target;
}

wxWindow *wxScrolledWindow::GetTargetWindow()
{
    return m_targetWindow;
}

void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
{
    int orient = event.GetOrientation();

    int nScrollInc = CalcScrollInc(event);
    if (nScrollInc == 0) return;

    if (orient == wxHORIZONTAL)
    {
        int newPos = m_xScrollPosition + nScrollInc;
        SetScrollPos(wxHORIZONTAL, newPos, TRUE );
    }
    else
    {
        int newPos = m_yScrollPosition + nScrollInc;
        SetScrollPos(wxVERTICAL, newPos, TRUE );
    }

    if (orient == wxHORIZONTAL)
    {
        m_xScrollPosition += nScrollInc;
    }
    else
    {
        m_yScrollPosition += nScrollInc;
    }

    if (orient == wxHORIZONTAL)
    {
       if (m_xScrollingEnabled)
            m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
       else
            m_targetWindow->Refresh();
    }
    else
    {
        if (m_yScrollingEnabled)
            m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
        else
            m_targetWindow->Refresh();
  }
#ifdef __WXMAC__
	m_targetWindow->MacUpdateImmediately() ;
#endif
}

int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
{
    int pos = event.GetPosition();
    int orient = event.GetOrientation();

    int nScrollInc = 0;
    switch (event.GetEventType())
    {
        case wxEVT_SCROLLWIN_TOP:
        {
            if (orient == wxHORIZONTAL)
                nScrollInc = - m_xScrollPosition;
            else
                nScrollInc = - m_yScrollPosition;
            break;
        }
        case wxEVT_SCROLLWIN_BOTTOM:
        {
            if (orient == wxHORIZONTAL)
                nScrollInc = m_xScrollLines - m_xScrollPosition;
            else
                nScrollInc = m_yScrollLines - m_yScrollPosition;
            break;
        }
        case wxEVT_SCROLLWIN_LINEUP:
        {
            nScrollInc = -1;
            break;
        }
        case wxEVT_SCROLLWIN_LINEDOWN:
        {
            nScrollInc = 1;
            break;
        }
        case wxEVT_SCROLLWIN_PAGEUP:
        {
            if (orient == wxHORIZONTAL)
                nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
            else
                nScrollInc = -GetScrollPageSize(wxVERTICAL);
            break;
        }
        case wxEVT_SCROLLWIN_PAGEDOWN:
        {
            if (orient == wxHORIZONTAL)
                nScrollInc = GetScrollPageSize(wxHORIZONTAL);
            else
                nScrollInc = GetScrollPageSize(wxVERTICAL);
            break;
        }
        case wxEVT_SCROLLWIN_THUMBTRACK:
        {
            if (orient == wxHORIZONTAL)
                nScrollInc = pos - m_xScrollPosition;
            else
                nScrollInc = pos - m_yScrollPosition;
            break;
        }
        default:
        {
            break;
        }
    }

    if (orient == wxHORIZONTAL)
    {
        if (m_xScrollPixelsPerLine > 0)
        {
            int w, h;
            m_targetWindow->GetClientSize(&w, &h);

            int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
            int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
            if (noPositions < 0)
	        noPositions = 0;

            if ( (m_xScrollPosition + nScrollInc) < 0 )
	        nScrollInc = -m_xScrollPosition; // As -ve as we can go
            else if ( (m_xScrollPosition + nScrollInc) > noPositions )
	        nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
        }
        else
            m_targetWindow->Refresh();
    }
    else
    {
        if (m_yScrollPixelsPerLine > 0)
	{
            int w, h;
            m_targetWindow->GetClientSize(&w, &h);

            int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
            int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
            if (noPositions < 0)
	        noPositions = 0;

            if ( (m_yScrollPosition + nScrollInc) < 0 )
	        nScrollInc = -m_yScrollPosition; // As -ve as we can go
            else if ( (m_yScrollPosition + nScrollInc) > noPositions )
	        nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
        }
        else
            m_targetWindow->Refresh();
    }

    return nScrollInc;
}

// Adjust the scrollbars - new version.
void wxScrolledWindow::AdjustScrollbars()
{
    int w, h;
    m_targetWindow->GetClientSize(&w, &h);

    int oldXScroll = m_xScrollPosition;
    int oldYScroll = m_yScrollPosition;

    if (m_xScrollLines > 0)
    {
	// Calculate page size i.e. number of scroll units you get on the
	// current client window
        int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
        if (noPagePositions < 1) noPagePositions = 1;

        // Correct position if greater than extent of canvas minus
	// the visible portion of it or if below zero
	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
        m_xScrollPosition = wxMax( 0, m_xScrollPosition );

        SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
        // The amount by which we scroll when paging
        SetScrollPageSize(wxHORIZONTAL, noPagePositions);
    }
    else
    {
        m_xScrollPosition = 0;
        SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
    }

    if (m_yScrollLines > 0)
    {
	// Calculate page size i.e. number of scroll units you get on the
	// current client window
        int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
        if (noPagePositions < 1) noPagePositions = 1;

        // Correct position if greater than extent of canvas minus
	// the visible portion of it or if below zero
        m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
        m_yScrollPosition = wxMax( 0, m_yScrollPosition );

        SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
        // The amount by which we scroll when paging
        SetScrollPageSize(wxVERTICAL, noPagePositions);
    }
    else
    {
        m_yScrollPosition = 0;
        SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
    }

    if (oldXScroll != m_xScrollPosition)
    {
       if (m_xScrollingEnabled)
            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
       else
            m_targetWindow->Refresh();
    }

    if (oldYScroll != m_yScrollPosition)
    {
        if (m_yScrollingEnabled)
            m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition), (const wxRect *) NULL );
        else
            m_targetWindow->Refresh();
    }
}

// Default OnSize resets scrollbars, if any
void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
{
#if wxUSE_CONSTRAINTS
    if (GetAutoLayout()) Layout();
#endif

    AdjustScrollbars();
}

// This calls OnDraw, having adjusted the origin according to the current
// scroll position
void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
{
    wxPaintDC dc(this);
    PrepareDC(dc);

    OnDraw(dc);
}

// Override this function if you don't want to have wxScrolledWindow
// automatically change the origin according to the scroll position.
void wxScrolledWindow::PrepareDC(wxDC& dc)
{
    dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
                        -m_yScrollPosition * m_yScrollPixelsPerLine );
    dc.SetUserScale( m_scaleX, m_scaleY );
}

#if WXWIN_COMPATIBILITY
void wxScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
{
      *x_page = GetScrollPageSize(wxHORIZONTAL);
      *y_page = GetScrollPageSize(wxVERTICAL);
}

void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
{
    if ( xx )
        *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
    if ( yy )
        *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
}
#endif // WXWIN_COMPATIBILITY

void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
{
    if ( x_unit )
        *x_unit = m_xScrollPixelsPerLine;
    if ( y_unit )
        *y_unit = m_yScrollPixelsPerLine;
}

int wxScrolledWindow::GetScrollPageSize(int orient) const
{
    if ( orient == wxHORIZONTAL )
        return m_xScrollLinesPerPage;
    else
        return m_yScrollLinesPerPage;
}

void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
{
    if ( orient == wxHORIZONTAL )
        m_xScrollLinesPerPage = pageSize;
    else
        m_yScrollLinesPerPage = pageSize;
}

/*
 * Scroll to given position (scroll position, not pixel position)
 */
void wxScrolledWindow::Scroll( int x_pos, int y_pos )
{
    if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
        ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;

    int w, h;
    m_targetWindow->GetClientSize(&w, &h);

    if (x_pos != -1)
    {
        int old_x = m_xScrollPosition;
        m_xScrollPosition = x_pos;

	// Calculate page size i.e. number of scroll units you get on the
	// current client window
        int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
        if (noPagePositions < 1) noPagePositions = 1;

        // Correct position if greater than extent of canvas minus
	// the visible portion of it or if below zero
        m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
        m_xScrollPosition = wxMax( 0, m_xScrollPosition );

        m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );

	m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
    }
    if (y_pos != -1)
    {
        int old_y = m_yScrollPosition;
        m_yScrollPosition = y_pos;

	// Calculate page size i.e. number of scroll units you get on the
	// current client window
        int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
        if (noPagePositions < 1) noPagePositions = 1;

        // Correct position if greater than extent of canvas minus
	// the visible portion of it or if below zero
        m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
        m_yScrollPosition = wxMax( 0, m_yScrollPosition );

        m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );

	m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
    }


#ifdef __WXMSW__
//    ::UpdateWindow ((HWND) GetHWND());
#else
//    Refresh();
#endif
#ifdef __WXMAC__
		m_targetWindow->MacUpdateImmediately() ;
#endif
}

void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
{
    m_xScrollingEnabled = x_scroll;
    m_yScrollingEnabled = y_scroll;
}

void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
{
    if ( x )
        *x = m_xScrollPixelsPerLine * m_xScrollLines;
    if ( y )
        *y = m_yScrollPixelsPerLine * m_yScrollLines;
}

// Where the current view starts from
void wxScrolledWindow::ViewStart (int *x, int *y) const
{
    if ( x )
        *x = m_xScrollPosition;
    if ( y )
        *y = m_yScrollPosition;
}

void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
{
    if ( xx )
        *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
    if ( yy )
        *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
}

void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
{
    if ( xx )
        *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
    if ( yy )
        *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
}
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: scrolwin.cpp
	3	// Purpose: wxScrolledWindow implementation
	4	// Author: Julian Smart
	5	// Modified by:
	6	// Created: 01/02/97
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Julian Smart and Markus Holzem
	9	// Licence: wxWindows license
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	#ifdef __GNUG__
	13	#pragma implementation
	14	#pragma implementation "scrolwin.h"
	15	#endif
	16
	17	// For compilers that support precompilation, includes "wx.h".
	18	#include "wx/wxprec.h"
	19
	20	#include "wx/utils.h"
	21	#include "wx/dcclient.h"
	22
	23	#ifdef __BORLANDC__
	24	#pragma hdrstop
	25	#endif
	26
	27	#include "wx/generic/scrolwin.h"
	28	#include "wx/panel.h"
	29
	30	BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
	31	EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
	32	EVT_SIZE(wxScrolledWindow::OnSize)
	33	EVT_PAINT(wxScrolledWindow::OnPaint)
	34	END_EVENT_TABLE()
	35
	36	IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
	37
	38	#ifdef __WXMSW__
	39	#include "windows.h"
	40	#endif
	41
	42	#ifdef __WXMOTIF__
	43	// For wxRETAINED implementation
	44	#ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
	45	//This code switches off the compiler warnings
	46	# pragma message disable nosimpint
	47	#endif
	48	#include <Xm/Xm.h>
	49	#ifdef __VMS__
	50	# pragma message enable nosimpint
	51	#endif
	52	#endif
	53
	54	wxScrolledWindow::wxScrolledWindow()
	55	{
	56	m_xScrollPixelsPerLine = 0;
	57	m_yScrollPixelsPerLine = 0;
	58	m_xScrollingEnabled = TRUE;
	59	m_yScrollingEnabled = TRUE;
	60	m_xScrollPosition = 0;
	61	m_yScrollPosition = 0;
	62	m_xScrollLines = 0;
	63	m_yScrollLines = 0;
	64	m_xScrollLinesPerPage = 0;
	65	m_yScrollLinesPerPage = 0;
	66	m_scaleX = 1.0;
	67	m_scaleY = 1.0;
	68	}
	69
	70	bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
	71	const wxPoint& pos,
	72	const wxSize& size,
	73	long style,
	74	const wxString& name)
	75	{
	76	m_xScrollPixelsPerLine = 0;
	77	m_yScrollPixelsPerLine = 0;
	78	m_xScrollingEnabled = TRUE;
	79	m_yScrollingEnabled = TRUE;
	80	m_xScrollPosition = 0;
	81	m_yScrollPosition = 0;
	82	m_xScrollLines = 0;
	83	m_yScrollLines = 0;
	84	m_xScrollLinesPerPage = 0;
	85	m_yScrollLinesPerPage = 0;
	86	m_scaleX = 1.0;
	87	m_scaleY = 1.0;
	88
	89	m_targetWindow = this;
	90
	91	return wxPanel::Create(parent, id, pos, size, style, name);
	92	}
	93
	94	/*
	95	* pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
	96	* noUnitsX/noUnitsY: : no. units per scrollbar
	97	*/
	98	void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
	99	int noUnitsX, int noUnitsY,
	100	int xPos, int yPos, bool noRefresh )
	101	{
	102	bool do_refresh =
	103	(
	104	(noUnitsX != 0 && m_xScrollLines == 0) \|\|
	105	(noUnitsX < m_xScrollLines) \|\|
	106	(noUnitsY != 0 && m_yScrollLines == 0) \|\|
	107	(noUnitsY < m_yScrollLines) \|\|
	108	(xPos != m_xScrollPosition) \|\|
	109	(yPos != m_yScrollPosition) \|\|
	110	(pixelsPerUnitX != m_xScrollPixelsPerLine) \|\|
	111	(pixelsPerUnitY != m_yScrollPixelsPerLine)
	112	);
	113
	114	m_xScrollPixelsPerLine = pixelsPerUnitX;
	115	m_yScrollPixelsPerLine = pixelsPerUnitY;
	116	m_xScrollPosition = xPos;
	117	m_yScrollPosition = yPos;
	118	m_xScrollLines = noUnitsX;
	119	m_yScrollLines = noUnitsY;
	120
	121	#ifdef __WXMOTIF__
	122	// Sorry, some Motif-specific code to implement a backing pixmap
	123	// for the wxRETAINED style. Implementing a backing store can't
	124	// be entirely generic because it relies on the wxWindowDC implementation
	125	// to duplicate X drawing calls for the backing pixmap.
	126
	127	if ((m_windowStyle & wxRETAINED) == wxRETAINED)
	128	{
	129	Display* dpy = XtDisplay((Widget) GetMainWidget());
	130
	131	int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
	132	int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
	133	if (m_backingPixmap &&
	134	!((m_pixmapWidth == totalPixelWidth) &&
	135	(m_pixmapHeight == totalPixelHeight)))
	136	{
	137	XFreePixmap (dpy, (Pixmap) m_backingPixmap);
	138	m_backingPixmap = (WXPixmap) 0;
	139	}
	140
	141	if (!m_backingPixmap &&
	142	(noUnitsX != 0) && (noUnitsY != 0))
	143	{
	144	int depth = wxDisplayDepth();
	145	m_pixmapWidth = totalPixelWidth;
	146	m_pixmapHeight = totalPixelHeight;
	147	m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
	148	m_pixmapWidth, m_pixmapHeight, depth);
	149	}
	150
	151	}
	152	#endif
	153
	154	AdjustScrollbars();
	155
	156	if (do_refresh && !noRefresh)
	157	m_targetWindow->Refresh();
	158
	159	#ifdef __WXMSW__
	160	// Necessary?
	161	UpdateWindow ((HWND) m_targetWindow->GetHWND());
	162	#endif
	163	#ifdef __WXMAC__
	164	m_targetWindow->MacUpdateImmediately() ;
	165	#endif
	166	}
	167
	168	wxScrolledWindow::~wxScrolledWindow()
	169	{
	170	}
	171
	172	void wxScrolledWindow::SetTargetWindow( wxWindow *target )
	173	{
	174	wxASSERT_MSG( target, wxT("target window must not be NULL") );
	175	m_targetWindow = target;
	176	}
	177
	178	wxWindow *wxScrolledWindow::GetTargetWindow()
	179	{
	180	return m_targetWindow;
	181	}
	182
	183	void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
	184	{
	185	int orient = event.GetOrientation();
	186
	187	int nScrollInc = CalcScrollInc(event);
	188	if (nScrollInc == 0) return;
	189
	190	if (orient == wxHORIZONTAL)
	191	{
	192	int newPos = m_xScrollPosition + nScrollInc;
	193	SetScrollPos(wxHORIZONTAL, newPos, TRUE );
	194	}
	195	else
	196	{
	197	int newPos = m_yScrollPosition + nScrollInc;
	198	SetScrollPos(wxVERTICAL, newPos, TRUE );
	199	}
	200
	201	if (orient == wxHORIZONTAL)
	202	{
	203	m_xScrollPosition += nScrollInc;
	204	}
	205	else
	206	{
	207	m_yScrollPosition += nScrollInc;
	208	}
	209
	210	if (orient == wxHORIZONTAL)
	211	{
	212	if (m_xScrollingEnabled)
	213	m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
	214	else
	215	m_targetWindow->Refresh();
	216	}
	217	else
	218	{
	219	if (m_yScrollingEnabled)
	220	m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
	221	else
	222	m_targetWindow->Refresh();
	223	}
	224	#ifdef __WXMAC__
	225	m_targetWindow->MacUpdateImmediately() ;
	226	#endif
	227	}
	228
	229	int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
	230	{
	231	int pos = event.GetPosition();
	232	int orient = event.GetOrientation();
	233
	234	int nScrollInc = 0;
	235	switch (event.GetEventType())
	236	{
	237	case wxEVT_SCROLLWIN_TOP:
	238	{
	239	if (orient == wxHORIZONTAL)
	240	nScrollInc = - m_xScrollPosition;
	241	else
	242	nScrollInc = - m_yScrollPosition;
	243	break;
	244	}
	245	case wxEVT_SCROLLWIN_BOTTOM:
	246	{
	247	if (orient == wxHORIZONTAL)
	248	nScrollInc = m_xScrollLines - m_xScrollPosition;
	249	else
	250	nScrollInc = m_yScrollLines - m_yScrollPosition;
	251	break;
	252	}
	253	case wxEVT_SCROLLWIN_LINEUP:
	254	{
	255	nScrollInc = -1;
	256	break;
	257	}
	258	case wxEVT_SCROLLWIN_LINEDOWN:
	259	{
	260	nScrollInc = 1;
	261	break;
	262	}
	263	case wxEVT_SCROLLWIN_PAGEUP:
	264	{
	265	if (orient == wxHORIZONTAL)
	266	nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
	267	else
	268	nScrollInc = -GetScrollPageSize(wxVERTICAL);
	269	break;
	270	}
	271	case wxEVT_SCROLLWIN_PAGEDOWN:
	272	{
	273	if (orient == wxHORIZONTAL)
	274	nScrollInc = GetScrollPageSize(wxHORIZONTAL);
	275	else
	276	nScrollInc = GetScrollPageSize(wxVERTICAL);
	277	break;
	278	}
	279	case wxEVT_SCROLLWIN_THUMBTRACK:
	280	{
	281	if (orient == wxHORIZONTAL)
	282	nScrollInc = pos - m_xScrollPosition;
	283	else
	284	nScrollInc = pos - m_yScrollPosition;
	285	break;
	286	}
	287	default:
	288	{
	289	break;
	290	}
	291	}
	292
	293	if (orient == wxHORIZONTAL)
	294	{
	295	if (m_xScrollPixelsPerLine > 0)
	296	{
	297	int w, h;
	298	m_targetWindow->GetClientSize(&w, &h);
	299
	300	int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
	301	int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
	302	if (noPositions < 0)
	303	noPositions = 0;
	304
	305	if ( (m_xScrollPosition + nScrollInc) < 0 )
	306	nScrollInc = -m_xScrollPosition; // As -ve as we can go
	307	else if ( (m_xScrollPosition + nScrollInc) > noPositions )
	308	nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
	309	}
	310	else
	311	m_targetWindow->Refresh();
	312	}
	313	else
	314	{
	315	if (m_yScrollPixelsPerLine > 0)
	316	{
	317	int w, h;
	318	m_targetWindow->GetClientSize(&w, &h);
	319
	320	int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
	321	int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
	322	if (noPositions < 0)
	323	noPositions = 0;
	324
	325	if ( (m_yScrollPosition + nScrollInc) < 0 )
	326	nScrollInc = -m_yScrollPosition; // As -ve as we can go
	327	else if ( (m_yScrollPosition + nScrollInc) > noPositions )
	328	nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
	329	}
	330	else
	331	m_targetWindow->Refresh();
	332	}
	333
	334	return nScrollInc;
	335	}
	336
	337	// Adjust the scrollbars - new version.
	338	void wxScrolledWindow::AdjustScrollbars()
	339	{
	340	int w, h;
	341	m_targetWindow->GetClientSize(&w, &h);
	342
	343	int oldXScroll = m_xScrollPosition;
	344	int oldYScroll = m_yScrollPosition;
	345
	346	if (m_xScrollLines > 0)
	347	{
	348	// Calculate page size i.e. number of scroll units you get on the
	349	// current client window
	350	int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
	351	if (noPagePositions < 1) noPagePositions = 1;
	352
	353	// Correct position if greater than extent of canvas minus
	354	// the visible portion of it or if below zero
	355	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
	356	m_xScrollPosition = wxMax( 0, m_xScrollPosition );
	357
	358	SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
	359	// The amount by which we scroll when paging
	360	SetScrollPageSize(wxHORIZONTAL, noPagePositions);
	361	}
	362	else
	363	{
	364	m_xScrollPosition = 0;
	365	SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
	366	}
	367
	368	if (m_yScrollLines > 0)
	369	{
	370	// Calculate page size i.e. number of scroll units you get on the
	371	// current client window
	372	int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
	373	if (noPagePositions < 1) noPagePositions = 1;
	374
	375	// Correct position if greater than extent of canvas minus
	376	// the visible portion of it or if below zero
	377	m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
	378	m_yScrollPosition = wxMax( 0, m_yScrollPosition );
	379
	380	SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
	381	// The amount by which we scroll when paging
	382	SetScrollPageSize(wxVERTICAL, noPagePositions);
	383	}
	384	else
	385	{
	386	m_yScrollPosition = 0;
	387	SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
	388	}
	389
	390	if (oldXScroll != m_xScrollPosition)
	391	{
	392	if (m_xScrollingEnabled)
	393	m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
	394	else
	395	m_targetWindow->Refresh();
	396	}
	397
	398	if (oldYScroll != m_yScrollPosition)
	399	{
	400	if (m_yScrollingEnabled)
	401	m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition), (const wxRect *) NULL );
	402	else
	403	m_targetWindow->Refresh();
	404	}
	405	}
	406
	407	// Default OnSize resets scrollbars, if any
	408	void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
	409	{
	410	#if wxUSE_CONSTRAINTS
	411	if (GetAutoLayout()) Layout();
	412	#endif
	413
	414	AdjustScrollbars();
	415	}
	416
	417	// This calls OnDraw, having adjusted the origin according to the current
	418	// scroll position
	419	void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
	420	{
	421	wxPaintDC dc(this);
	422	PrepareDC(dc);
	423
	424	OnDraw(dc);
	425	}
	426
	427	// Override this function if you don't want to have wxScrolledWindow
	428	// automatically change the origin according to the scroll position.
	429	void wxScrolledWindow::PrepareDC(wxDC& dc)
	430	{
	431	dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
	432	-m_yScrollPosition * m_yScrollPixelsPerLine );
	433	dc.SetUserScale( m_scaleX, m_scaleY );
	434	}
	435
	436	#if WXWIN_COMPATIBILITY
	437	void wxScrolledWindow::GetScrollUnitsPerPage (int x_page, int y_page) const
	438	{
	439	*x_page = GetScrollPageSize(wxHORIZONTAL);
	440	*y_page = GetScrollPageSize(wxVERTICAL);
	441	}
	442
	443	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float xx, float yy) const
	444	{
	445	if ( xx )
	446	xx = (float)(x + m_xScrollPosition m_xScrollPixelsPerLine);
	447	if ( yy )
	448	yy = (float)(y + m_yScrollPosition m_yScrollPixelsPerLine);
	449	}
	450	#endif // WXWIN_COMPATIBILITY
	451
	452	void wxScrolledWindow::GetScrollPixelsPerUnit (int x_unit, int y_unit) const
	453	{
	454	if ( x_unit )
	455	*x_unit = m_xScrollPixelsPerLine;
	456	if ( y_unit )
	457	*y_unit = m_yScrollPixelsPerLine;
	458	}
	459
	460	int wxScrolledWindow::GetScrollPageSize(int orient) const
	461	{
	462	if ( orient == wxHORIZONTAL )
	463	return m_xScrollLinesPerPage;
	464	else
	465	return m_yScrollLinesPerPage;
	466	}
	467
	468	void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
	469	{
	470	if ( orient == wxHORIZONTAL )
	471	m_xScrollLinesPerPage = pageSize;
	472	else
	473	m_yScrollLinesPerPage = pageSize;
	474	}
	475
	476	/*
	477	* Scroll to given position (scroll position, not pixel position)
	478	*/
	479	void wxScrolledWindow::Scroll( int x_pos, int y_pos )
	480	{
	481	if (((x_pos == -1) \|\| (x_pos == m_xScrollPosition)) &&
	482	((y_pos == -1) \|\| (y_pos == m_yScrollPosition))) return;
	483
	484	int w, h;
	485	m_targetWindow->GetClientSize(&w, &h);
	486
	487	if (x_pos != -1)
	488	{
	489	int old_x = m_xScrollPosition;
	490	m_xScrollPosition = x_pos;
	491
	492	// Calculate page size i.e. number of scroll units you get on the
	493	// current client window
	494	int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
	495	if (noPagePositions < 1) noPagePositions = 1;
	496
	497	// Correct position if greater than extent of canvas minus
	498	// the visible portion of it or if below zero
	499	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
	500	m_xScrollPosition = wxMax( 0, m_xScrollPosition );
	501
	502	m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );
	503
	504	m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
	505	}
	506	if (y_pos != -1)
	507	{
	508	int old_y = m_yScrollPosition;
	509	m_yScrollPosition = y_pos;
	510
	511	// Calculate page size i.e. number of scroll units you get on the
	512	// current client window
	513	int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
	514	if (noPagePositions < 1) noPagePositions = 1;
	515
	516	// Correct position if greater than extent of canvas minus
	517	// the visible portion of it or if below zero
	518	m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
	519	m_yScrollPosition = wxMax( 0, m_yScrollPosition );
	520
	521	m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
	522
	523	m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
	524	}
	525
	526
	527	#ifdef __WXMSW__
	528	// ::UpdateWindow ((HWND) GetHWND());
	529	#else
	530	// Refresh();
	531	#endif
	532	#ifdef __WXMAC__
	533	m_targetWindow->MacUpdateImmediately() ;
	534	#endif
	535	}
	536
	537	void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
	538	{
	539	m_xScrollingEnabled = x_scroll;
	540	m_yScrollingEnabled = y_scroll;
	541	}
	542
	543	void wxScrolledWindow::GetVirtualSize (int x, int y) const
	544	{
	545	if ( x )
	546	x = m_xScrollPixelsPerLine m_xScrollLines;
	547	if ( y )
	548	y = m_yScrollPixelsPerLine m_yScrollLines;
	549	}
	550
	551	// Where the current view starts from
	552	void wxScrolledWindow::ViewStart (int x, int y) const
	553	{
	554	if ( x )
	555	*x = m_xScrollPosition;
	556	if ( y )
	557	*y = m_yScrollPosition;
	558	}
	559
	560	void wxScrolledWindow::CalcScrolledPosition(int x, int y, int xx, int yy) const
	561	{
	562	if ( xx )
	563	xx = x - m_xScrollPosition m_xScrollPixelsPerLine;
	564	if ( yy )
	565	yy = y - m_yScrollPosition m_yScrollPixelsPerLine;
	566	}
	567
	568	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int xx, int yy) const
	569	{
	570	if ( xx )
	571	xx = x + m_xScrollPosition m_xScrollPixelsPerLine;
	572	if ( yy )
	573	yy = y + m_yScrollPosition m_yScrollPixelsPerLine;
	574	}