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"

#if !USE_SHARED_LIBRARY
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)
#endif

#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	#if !USE_SHARED_LIBRARY
	31	BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
	32	EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
	33	EVT_SIZE(wxScrolledWindow::OnSize)
	34	EVT_PAINT(wxScrolledWindow::OnPaint)
	35	END_EVENT_TABLE()
	36
	37	IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
	38	#endif
	39
	40	#ifdef __WXMSW__
	41	#include "windows.h"
	42	#endif
	43
	44	#ifdef __WXMOTIF__
	45	// For wxRETAINED implementation
	46	#ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
	47	//This code switches off the compiler warnings
	48	# pragma message disable nosimpint
	49	#endif
	50	#include <Xm/Xm.h>
	51	#ifdef __VMS__
	52	# pragma message enable nosimpint
	53	#endif
	54	#endif
	55
	56	wxScrolledWindow::wxScrolledWindow()
	57	{
	58	m_xScrollPixelsPerLine = 0;
	59	m_yScrollPixelsPerLine = 0;
	60	m_xScrollingEnabled = TRUE;
	61	m_yScrollingEnabled = TRUE;
	62	m_xScrollPosition = 0;
	63	m_yScrollPosition = 0;
	64	m_xScrollLines = 0;
	65	m_yScrollLines = 0;
	66	m_xScrollLinesPerPage = 0;
	67	m_yScrollLinesPerPage = 0;
	68	m_scaleX = 1.0;
	69	m_scaleY = 1.0;
	70	}
	71
	72	bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
	73	const wxPoint& pos,
	74	const wxSize& size,
	75	long style,
	76	const wxString& name)
	77	{
	78	m_xScrollPixelsPerLine = 0;
	79	m_yScrollPixelsPerLine = 0;
	80	m_xScrollingEnabled = TRUE;
	81	m_yScrollingEnabled = TRUE;
	82	m_xScrollPosition = 0;
	83	m_yScrollPosition = 0;
	84	m_xScrollLines = 0;
	85	m_yScrollLines = 0;
	86	m_xScrollLinesPerPage = 0;
	87	m_yScrollLinesPerPage = 0;
	88	m_scaleX = 1.0;
	89	m_scaleY = 1.0;
	90
	91	m_targetWindow = this;
	92
	93	return wxPanel::Create(parent, id, pos, size, style, name);
	94	}
	95
	96	/*
	97	* pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
	98	* noUnitsX/noUnitsY: : no. units per scrollbar
	99	*/
	100	void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
	101	int noUnitsX, int noUnitsY,
	102	int xPos, int yPos, bool noRefresh )
	103	{
	104	bool do_refresh =
	105	(
	106	(noUnitsX != 0 && m_xScrollLines == 0) \|\|
	107	(noUnitsX < m_xScrollLines) \|\|
	108	(noUnitsY != 0 && m_yScrollLines == 0) \|\|
	109	(noUnitsY < m_yScrollLines) \|\|
	110	(xPos != m_xScrollPosition) \|\|
	111	(yPos != m_yScrollPosition) \|\|
	112	(pixelsPerUnitX != m_xScrollPixelsPerLine) \|\|
	113	(pixelsPerUnitY != m_yScrollPixelsPerLine)
	114	);
	115
	116	m_xScrollPixelsPerLine = pixelsPerUnitX;
	117	m_yScrollPixelsPerLine = pixelsPerUnitY;
	118	m_xScrollPosition = xPos;
	119	m_yScrollPosition = yPos;
	120	m_xScrollLines = noUnitsX;
	121	m_yScrollLines = noUnitsY;
	122
	123	#ifdef __WXMOTIF__
	124	// Sorry, some Motif-specific code to implement a backing pixmap
	125	// for the wxRETAINED style. Implementing a backing store can't
	126	// be entirely generic because it relies on the wxWindowDC implementation
	127	// to duplicate X drawing calls for the backing pixmap.
	128
	129	if ((m_windowStyle & wxRETAINED) == wxRETAINED)
	130	{
	131	Display* dpy = XtDisplay((Widget) GetMainWidget());
	132
	133	int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
	134	int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
	135	if (m_backingPixmap &&
	136	!((m_pixmapWidth == totalPixelWidth) &&
	137	(m_pixmapHeight == totalPixelHeight)))
	138	{
	139	XFreePixmap (dpy, (Pixmap) m_backingPixmap);
	140	m_backingPixmap = (WXPixmap) 0;
	141	}
	142
	143	if (!m_backingPixmap &&
	144	(noUnitsX != 0) && (noUnitsY != 0))
	145	{
	146	int depth = wxDisplayDepth();
	147	m_pixmapWidth = totalPixelWidth;
	148	m_pixmapHeight = totalPixelHeight;
	149	m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
	150	m_pixmapWidth, m_pixmapHeight, depth);
	151	}
	152
	153	}
	154	#endif
	155
	156	AdjustScrollbars();
	157
	158	if (do_refresh && !noRefresh)
	159	m_targetWindow->Refresh();
	160
	161	#ifdef __WXMSW__
	162	// Necessary?
	163	UpdateWindow ((HWND) m_targetWindow->GetHWND());
	164	#endif
	165	#ifdef __WXMAC__
	166	m_targetWindow->MacUpdateImmediately() ;
	167	#endif
	168	}
	169
	170	wxScrolledWindow::~wxScrolledWindow()
	171	{
	172	}
	173
	174	void wxScrolledWindow::SetTargetWindow( wxWindow *target )
	175	{
	176	wxASSERT_MSG( target, wxT("target window must not be NULL") );
	177	m_targetWindow = target;
	178	}
	179
	180	wxWindow *wxScrolledWindow::GetTargetWindow()
	181	{
	182	return m_targetWindow;
	183	}
	184
	185	void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
	186	{
	187	int orient = event.GetOrientation();
	188
	189	int nScrollInc = CalcScrollInc(event);
	190	if (nScrollInc == 0) return;
	191
	192	if (orient == wxHORIZONTAL)
	193	{
	194	int newPos = m_xScrollPosition + nScrollInc;
	195	SetScrollPos(wxHORIZONTAL, newPos, TRUE );
	196	}
	197	else
	198	{
	199	int newPos = m_yScrollPosition + nScrollInc;
	200	SetScrollPos(wxVERTICAL, newPos, TRUE );
	201	}
	202
	203	if (orient == wxHORIZONTAL)
	204	{
	205	m_xScrollPosition += nScrollInc;
	206	}
	207	else
	208	{
	209	m_yScrollPosition += nScrollInc;
	210	}
	211
	212	if (orient == wxHORIZONTAL)
	213	{
	214	if (m_xScrollingEnabled)
	215	m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
	216	else
	217	m_targetWindow->Refresh();
	218	}
	219	else
	220	{
	221	if (m_yScrollingEnabled)
	222	m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
	223	else
	224	m_targetWindow->Refresh();
	225	}
	226	#ifdef __WXMAC__
	227	m_targetWindow->MacUpdateImmediately() ;
	228	#endif
	229	}
	230
	231	int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
	232	{
	233	int pos = event.GetPosition();
	234	int orient = event.GetOrientation();
	235
	236	int nScrollInc = 0;
	237	switch (event.GetEventType())
	238	{
	239	case wxEVT_SCROLLWIN_TOP:
	240	{
	241	if (orient == wxHORIZONTAL)
	242	nScrollInc = - m_xScrollPosition;
	243	else
	244	nScrollInc = - m_yScrollPosition;
	245	break;
	246	}
	247	case wxEVT_SCROLLWIN_BOTTOM:
	248	{
	249	if (orient == wxHORIZONTAL)
	250	nScrollInc = m_xScrollLines - m_xScrollPosition;
	251	else
	252	nScrollInc = m_yScrollLines - m_yScrollPosition;
	253	break;
	254	}
	255	case wxEVT_SCROLLWIN_LINEUP:
	256	{
	257	nScrollInc = -1;
	258	break;
	259	}
	260	case wxEVT_SCROLLWIN_LINEDOWN:
	261	{
	262	nScrollInc = 1;
	263	break;
	264	}
	265	case wxEVT_SCROLLWIN_PAGEUP:
	266	{
	267	if (orient == wxHORIZONTAL)
	268	nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
	269	else
	270	nScrollInc = -GetScrollPageSize(wxVERTICAL);
	271	break;
	272	}
	273	case wxEVT_SCROLLWIN_PAGEDOWN:
	274	{
	275	if (orient == wxHORIZONTAL)
	276	nScrollInc = GetScrollPageSize(wxHORIZONTAL);
	277	else
	278	nScrollInc = GetScrollPageSize(wxVERTICAL);
	279	break;
	280	}
	281	case wxEVT_SCROLLWIN_THUMBTRACK:
	282	{
	283	if (orient == wxHORIZONTAL)
	284	nScrollInc = pos - m_xScrollPosition;
	285	else
	286	nScrollInc = pos - m_yScrollPosition;
	287	break;
	288	}
	289	default:
	290	{
	291	break;
	292	}
	293	}
	294
	295	if (orient == wxHORIZONTAL)
	296	{
	297	if (m_xScrollPixelsPerLine > 0)
	298	{
	299	int w, h;
	300	m_targetWindow->GetClientSize(&w, &h);
	301
	302	int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
	303	int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
	304	if (noPositions < 0)
	305	noPositions = 0;
	306
	307	if ( (m_xScrollPosition + nScrollInc) < 0 )
	308	nScrollInc = -m_xScrollPosition; // As -ve as we can go
	309	else if ( (m_xScrollPosition + nScrollInc) > noPositions )
	310	nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
	311	}
	312	else
	313	m_targetWindow->Refresh();
	314	}
	315	else
	316	{
	317	if (m_yScrollPixelsPerLine > 0)
	318	{
	319	int w, h;
	320	m_targetWindow->GetClientSize(&w, &h);
	321
	322	int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
	323	int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
	324	if (noPositions < 0)
	325	noPositions = 0;
	326
	327	if ( (m_yScrollPosition + nScrollInc) < 0 )
	328	nScrollInc = -m_yScrollPosition; // As -ve as we can go
	329	else if ( (m_yScrollPosition + nScrollInc) > noPositions )
	330	nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
	331	}
	332	else
	333	m_targetWindow->Refresh();
	334	}
	335
	336	return nScrollInc;
	337	}
	338
	339	// Adjust the scrollbars - new version.
	340	void wxScrolledWindow::AdjustScrollbars()
	341	{
	342	int w, h;
	343	m_targetWindow->GetClientSize(&w, &h);
	344
	345	int oldXScroll = m_xScrollPosition;
	346	int oldYScroll = m_yScrollPosition;
	347
	348	if (m_xScrollLines > 0)
	349	{
	350	// Calculate page size i.e. number of scroll units you get on the
	351	// current client window
	352	int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
	353	if (noPagePositions < 1) noPagePositions = 1;
	354
	355	// Correct position if greater than extent of canvas minus
	356	// the visible portion of it or if below zero
	357	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
	358	m_xScrollPosition = wxMax( 0, m_xScrollPosition );
	359
	360	SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
	361	// The amount by which we scroll when paging
	362	SetScrollPageSize(wxHORIZONTAL, noPagePositions);
	363	}
	364	else
	365	{
	366	m_xScrollPosition = 0;
	367	SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
	368	}
	369
	370	if (m_yScrollLines > 0)
	371	{
	372	// Calculate page size i.e. number of scroll units you get on the
	373	// current client window
	374	int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
	375	if (noPagePositions < 1) noPagePositions = 1;
	376
	377	// Correct position if greater than extent of canvas minus
	378	// the visible portion of it or if below zero
	379	m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
	380	m_yScrollPosition = wxMax( 0, m_yScrollPosition );
	381
	382	SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
	383	// The amount by which we scroll when paging
	384	SetScrollPageSize(wxVERTICAL, noPagePositions);
	385	}
	386	else
	387	{
	388	m_yScrollPosition = 0;
	389	SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
	390	}
	391
	392	if (oldXScroll != m_xScrollPosition)
	393	{
	394	if (m_xScrollingEnabled)
	395	m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
	396	else
	397	m_targetWindow->Refresh();
	398	}
	399
	400	if (oldYScroll != m_yScrollPosition)
	401	{
	402	if (m_yScrollingEnabled)
	403	m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition), (const wxRect *) NULL );
	404	else
	405	m_targetWindow->Refresh();
	406	}
	407	}
	408
	409	// Default OnSize resets scrollbars, if any
	410	void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
	411	{
	412	#if wxUSE_CONSTRAINTS
	413	if (GetAutoLayout()) Layout();
	414	#endif
	415
	416	AdjustScrollbars();
	417	}
	418
	419	// This calls OnDraw, having adjusted the origin according to the current
	420	// scroll position
	421	void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
	422	{
	423	wxPaintDC dc(this);
	424	PrepareDC(dc);
	425
	426	OnDraw(dc);
	427	}
	428
	429	// Override this function if you don't want to have wxScrolledWindow
	430	// automatically change the origin according to the scroll position.
	431	void wxScrolledWindow::PrepareDC(wxDC& dc)
	432	{
	433	dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
	434	-m_yScrollPosition * m_yScrollPixelsPerLine );
	435	dc.SetUserScale( m_scaleX, m_scaleY );
	436	}
	437
	438	#if WXWIN_COMPATIBILITY
	439	void wxScrolledWindow::GetScrollUnitsPerPage (int x_page, int y_page) const
	440	{
	441	*x_page = GetScrollPageSize(wxHORIZONTAL);
	442	*y_page = GetScrollPageSize(wxVERTICAL);
	443	}
	444
	445	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float xx, float yy) const
	446	{
	447	if ( xx )
	448	xx = (float)(x + m_xScrollPosition m_xScrollPixelsPerLine);
	449	if ( yy )
	450	yy = (float)(y + m_yScrollPosition m_yScrollPixelsPerLine);
	451	}
	452	#endif // WXWIN_COMPATIBILITY
	453
	454	void wxScrolledWindow::GetScrollPixelsPerUnit (int x_unit, int y_unit) const
	455	{
	456	if ( x_unit )
	457	*x_unit = m_xScrollPixelsPerLine;
	458	if ( y_unit )
	459	*y_unit = m_yScrollPixelsPerLine;
	460	}
	461
	462	int wxScrolledWindow::GetScrollPageSize(int orient) const
	463	{
	464	if ( orient == wxHORIZONTAL )
	465	return m_xScrollLinesPerPage;
	466	else
	467	return m_yScrollLinesPerPage;
	468	}
	469
	470	void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
	471	{
	472	if ( orient == wxHORIZONTAL )
	473	m_xScrollLinesPerPage = pageSize;
	474	else
	475	m_yScrollLinesPerPage = pageSize;
	476	}
	477
	478	/*
	479	* Scroll to given position (scroll position, not pixel position)
	480	*/
	481	void wxScrolledWindow::Scroll( int x_pos, int y_pos )
	482	{
	483	if (((x_pos == -1) \|\| (x_pos == m_xScrollPosition)) &&
	484	((y_pos == -1) \|\| (y_pos == m_yScrollPosition))) return;
	485
	486	int w, h;
	487	m_targetWindow->GetClientSize(&w, &h);
	488
	489	if (x_pos != -1)
	490	{
	491	int old_x = m_xScrollPosition;
	492	m_xScrollPosition = x_pos;
	493
	494	// Calculate page size i.e. number of scroll units you get on the
	495	// current client window
	496	int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
	497	if (noPagePositions < 1) noPagePositions = 1;
	498
	499	// Correct position if greater than extent of canvas minus
	500	// the visible portion of it or if below zero
	501	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
	502	m_xScrollPosition = wxMax( 0, m_xScrollPosition );
	503
	504	m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );
	505
	506	m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
	507	}
	508	if (y_pos != -1)
	509	{
	510	int old_y = m_yScrollPosition;
	511	m_yScrollPosition = y_pos;
	512
	513	// Calculate page size i.e. number of scroll units you get on the
	514	// current client window
	515	int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
	516	if (noPagePositions < 1) noPagePositions = 1;
	517
	518	// Correct position if greater than extent of canvas minus
	519	// the visible portion of it or if below zero
	520	m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
	521	m_yScrollPosition = wxMax( 0, m_yScrollPosition );
	522
	523	m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
	524
	525	m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
	526	}
	527
	528
	529	#ifdef __WXMSW__
	530	// ::UpdateWindow ((HWND) GetHWND());
	531	#else
	532	// Refresh();
	533	#endif
	534	#ifdef __WXMAC__
	535	m_targetWindow->MacUpdateImmediately() ;
	536	#endif
	537	}
	538
	539	void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
	540	{
	541	m_xScrollingEnabled = x_scroll;
	542	m_yScrollingEnabled = y_scroll;
	543	}
	544
	545	void wxScrolledWindow::GetVirtualSize (int x, int y) const
	546	{
	547	if ( x )
	548	x = m_xScrollPixelsPerLine m_xScrollLines;
	549	if ( y )
	550	y = m_yScrollPixelsPerLine m_yScrollLines;
	551	}
	552
	553	// Where the current view starts from
	554	void wxScrolledWindow::ViewStart (int x, int y) const
	555	{
	556	if ( x )
	557	*x = m_xScrollPosition;
	558	if ( y )
	559	*y = m_yScrollPosition;
	560	}
	561
	562	void wxScrolledWindow::CalcScrolledPosition(int x, int y, int xx, int yy) const
	563	{
	564	if ( xx )
	565	xx = x - m_xScrollPosition m_xScrollPixelsPerLine;
	566	if ( yy )
	567	yy = y - m_yScrollPosition m_yScrollPixelsPerLine;
	568	}
	569
	570	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int xx, int yy) const
	571	{
	572	if ( xx )
	573	xx = x + m_xScrollPosition m_xScrollPixelsPerLine;
	574	if ( yy )
	575	yy = y + m_yScrollPosition m_yScrollPixelsPerLine;
	576	}