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__
    // GRG: if this turns out to be really necessary, we could
    //   at least move it to the above if { ... } so that it is
    //   only done if noRefresh = FALSE (the default). OTOH, if
    //   this doesn't break anything, which seems to be the
    //   case, we could just leave it out.

    // 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 __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::GetViewStart (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	// GRG: if this turns out to be really necessary, we could
	161	// at least move it to the above if { ... } so that it is
	162	// only done if noRefresh = FALSE (the default). OTOH, if
	163	// this doesn't break anything, which seems to be the
	164	// case, we could just leave it out.
	165
	166	// Necessary?
	167	// UpdateWindow ((HWND) m_targetWindow->GetHWND());
	168	#endif
	169	#ifdef __WXMAC__
	170	m_targetWindow->MacUpdateImmediately() ;
	171	#endif
	172	}
	173
	174	wxScrolledWindow::~wxScrolledWindow()
	175	{
	176	}
	177
	178	void wxScrolledWindow::SetTargetWindow( wxWindow *target )
	179	{
	180	wxASSERT_MSG( target, wxT("target window must not be NULL") );
	181	m_targetWindow = target;
	182	}
	183
	184	wxWindow *wxScrolledWindow::GetTargetWindow()
	185	{
	186	return m_targetWindow;
	187	}
	188
	189	void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
	190	{
	191	int orient = event.GetOrientation();
	192
	193	int nScrollInc = CalcScrollInc(event);
	194	if (nScrollInc == 0) return;
	195
	196	if (orient == wxHORIZONTAL)
	197	{
	198	int newPos = m_xScrollPosition + nScrollInc;
	199	SetScrollPos(wxHORIZONTAL, newPos, TRUE );
	200	}
	201	else
	202	{
	203	int newPos = m_yScrollPosition + nScrollInc;
	204	SetScrollPos(wxVERTICAL, newPos, TRUE );
	205	}
	206
	207	if (orient == wxHORIZONTAL)
	208	{
	209	m_xScrollPosition += nScrollInc;
	210	}
	211	else
	212	{
	213	m_yScrollPosition += nScrollInc;
	214	}
	215
	216	if (orient == wxHORIZONTAL)
	217	{
	218	if (m_xScrollingEnabled)
	219	m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
	220	else
	221	m_targetWindow->Refresh();
	222	}
	223	else
	224	{
	225	if (m_yScrollingEnabled)
	226	m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
	227	else
	228	m_targetWindow->Refresh();
	229	}
	230	#ifdef __WXMAC__
	231	m_targetWindow->MacUpdateImmediately() ;
	232	#endif
	233	}
	234
	235	int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
	236	{
	237	int pos = event.GetPosition();
	238	int orient = event.GetOrientation();
	239
	240	int nScrollInc = 0;
	241	switch (event.GetEventType())
	242	{
	243	case wxEVT_SCROLLWIN_TOP:
	244	{
	245	if (orient == wxHORIZONTAL)
	246	nScrollInc = - m_xScrollPosition;
	247	else
	248	nScrollInc = - m_yScrollPosition;
	249	break;
	250	}
	251	case wxEVT_SCROLLWIN_BOTTOM:
	252	{
	253	if (orient == wxHORIZONTAL)
	254	nScrollInc = m_xScrollLines - m_xScrollPosition;
	255	else
	256	nScrollInc = m_yScrollLines - m_yScrollPosition;
	257	break;
	258	}
	259	case wxEVT_SCROLLWIN_LINEUP:
	260	{
	261	nScrollInc = -1;
	262	break;
	263	}
	264	case wxEVT_SCROLLWIN_LINEDOWN:
	265	{
	266	nScrollInc = 1;
	267	break;
	268	}
	269	case wxEVT_SCROLLWIN_PAGEUP:
	270	{
	271	if (orient == wxHORIZONTAL)
	272	nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
	273	else
	274	nScrollInc = -GetScrollPageSize(wxVERTICAL);
	275	break;
	276	}
	277	case wxEVT_SCROLLWIN_PAGEDOWN:
	278	{
	279	if (orient == wxHORIZONTAL)
	280	nScrollInc = GetScrollPageSize(wxHORIZONTAL);
	281	else
	282	nScrollInc = GetScrollPageSize(wxVERTICAL);
	283	break;
	284	}
	285	case wxEVT_SCROLLWIN_THUMBTRACK:
	286	{
	287	if (orient == wxHORIZONTAL)
	288	nScrollInc = pos - m_xScrollPosition;
	289	else
	290	nScrollInc = pos - m_yScrollPosition;
	291	break;
	292	}
	293	default:
	294	{
	295	break;
	296	}
	297	}
	298
	299	if (orient == wxHORIZONTAL)
	300	{
	301	if (m_xScrollPixelsPerLine > 0)
	302	{
	303	int w, h;
	304	m_targetWindow->GetClientSize(&w, &h);
	305
	306	int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
	307	int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
	308	if (noPositions < 0)
	309	noPositions = 0;
	310
	311	if ( (m_xScrollPosition + nScrollInc) < 0 )
	312	nScrollInc = -m_xScrollPosition; // As -ve as we can go
	313	else if ( (m_xScrollPosition + nScrollInc) > noPositions )
	314	nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
	315	}
	316	else
	317	m_targetWindow->Refresh();
	318	}
	319	else
	320	{
	321	if (m_yScrollPixelsPerLine > 0)
	322	{
	323	int w, h;
	324	m_targetWindow->GetClientSize(&w, &h);
	325
	326	int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
	327	int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
	328	if (noPositions < 0)
	329	noPositions = 0;
	330
	331	if ( (m_yScrollPosition + nScrollInc) < 0 )
	332	nScrollInc = -m_yScrollPosition; // As -ve as we can go
	333	else if ( (m_yScrollPosition + nScrollInc) > noPositions )
	334	nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
	335	}
	336	else
	337	m_targetWindow->Refresh();
	338	}
	339
	340	return nScrollInc;
	341	}
	342
	343	// Adjust the scrollbars - new version.
	344	void wxScrolledWindow::AdjustScrollbars()
	345	{
	346	int w, h;
	347	m_targetWindow->GetClientSize(&w, &h);
	348
	349	int oldXScroll = m_xScrollPosition;
	350	int oldYScroll = m_yScrollPosition;
	351
	352	if (m_xScrollLines > 0)
	353	{
	354	// Calculate page size i.e. number of scroll units you get on the
	355	// current client window
	356	int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
	357	if (noPagePositions < 1) noPagePositions = 1;
	358
	359	// Correct position if greater than extent of canvas minus
	360	// the visible portion of it or if below zero
	361	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
	362	m_xScrollPosition = wxMax( 0, m_xScrollPosition );
	363
	364	SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
	365	// The amount by which we scroll when paging
	366	SetScrollPageSize(wxHORIZONTAL, noPagePositions);
	367	}
	368	else
	369	{
	370	m_xScrollPosition = 0;
	371	SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
	372	}
	373
	374	if (m_yScrollLines > 0)
	375	{
	376	// Calculate page size i.e. number of scroll units you get on the
	377	// current client window
	378	int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
	379	if (noPagePositions < 1) noPagePositions = 1;
	380
	381	// Correct position if greater than extent of canvas minus
	382	// the visible portion of it or if below zero
	383	m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
	384	m_yScrollPosition = wxMax( 0, m_yScrollPosition );
	385
	386	SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
	387	// The amount by which we scroll when paging
	388	SetScrollPageSize(wxVERTICAL, noPagePositions);
	389	}
	390	else
	391	{
	392	m_yScrollPosition = 0;
	393	SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
	394	}
	395
	396	if (oldXScroll != m_xScrollPosition)
	397	{
	398	if (m_xScrollingEnabled)
	399	m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
	400	else
	401	m_targetWindow->Refresh();
	402	}
	403
	404	if (oldYScroll != m_yScrollPosition)
	405	{
	406	if (m_yScrollingEnabled)
	407	m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition), (const wxRect *) NULL );
	408	else
	409	m_targetWindow->Refresh();
	410	}
	411	}
	412
	413	// Default OnSize resets scrollbars, if any
	414	void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
	415	{
	416	#if wxUSE_CONSTRAINTS
	417	if (GetAutoLayout()) Layout();
	418	#endif
	419
	420	AdjustScrollbars();
	421	}
	422
	423	// This calls OnDraw, having adjusted the origin according to the current
	424	// scroll position
	425	void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
	426	{
	427	wxPaintDC dc(this);
	428	PrepareDC(dc);
	429
	430	OnDraw(dc);
	431	}
	432
	433	// Override this function if you don't want to have wxScrolledWindow
	434	// automatically change the origin according to the scroll position.
	435	void wxScrolledWindow::PrepareDC(wxDC& dc)
	436	{
	437	dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
	438	-m_yScrollPosition * m_yScrollPixelsPerLine );
	439	dc.SetUserScale( m_scaleX, m_scaleY );
	440	}
	441
	442	#if WXWIN_COMPATIBILITY
	443	void wxScrolledWindow::GetScrollUnitsPerPage (int x_page, int y_page) const
	444	{
	445	*x_page = GetScrollPageSize(wxHORIZONTAL);
	446	*y_page = GetScrollPageSize(wxVERTICAL);
	447	}
	448
	449	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float xx, float yy) const
	450	{
	451	if ( xx )
	452	xx = (float)(x + m_xScrollPosition m_xScrollPixelsPerLine);
	453	if ( yy )
	454	yy = (float)(y + m_yScrollPosition m_yScrollPixelsPerLine);
	455	}
	456	#endif // WXWIN_COMPATIBILITY
	457
	458	void wxScrolledWindow::GetScrollPixelsPerUnit (int x_unit, int y_unit) const
	459	{
	460	if ( x_unit )
	461	*x_unit = m_xScrollPixelsPerLine;
	462	if ( y_unit )
	463	*y_unit = m_yScrollPixelsPerLine;
	464	}
	465
	466	int wxScrolledWindow::GetScrollPageSize(int orient) const
	467	{
	468	if ( orient == wxHORIZONTAL )
	469	return m_xScrollLinesPerPage;
	470	else
	471	return m_yScrollLinesPerPage;
	472	}
	473
	474	void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
	475	{
	476	if ( orient == wxHORIZONTAL )
	477	m_xScrollLinesPerPage = pageSize;
	478	else
	479	m_yScrollLinesPerPage = pageSize;
	480	}
	481
	482	/*
	483	* Scroll to given position (scroll position, not pixel position)
	484	*/
	485	void wxScrolledWindow::Scroll( int x_pos, int y_pos )
	486	{
	487	if (((x_pos == -1) \|\| (x_pos == m_xScrollPosition)) &&
	488	((y_pos == -1) \|\| (y_pos == m_yScrollPosition))) return;
	489
	490	int w, h;
	491	m_targetWindow->GetClientSize(&w, &h);
	492
	493	if (x_pos != -1)
	494	{
	495	int old_x = m_xScrollPosition;
	496	m_xScrollPosition = x_pos;
	497
	498	// Calculate page size i.e. number of scroll units you get on the
	499	// current client window
	500	int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
	501	if (noPagePositions < 1) noPagePositions = 1;
	502
	503	// Correct position if greater than extent of canvas minus
	504	// the visible portion of it or if below zero
	505	m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
	506	m_xScrollPosition = wxMax( 0, m_xScrollPosition );
	507
	508	m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );
	509
	510	m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
	511	}
	512	if (y_pos != -1)
	513	{
	514	int old_y = m_yScrollPosition;
	515	m_yScrollPosition = y_pos;
	516
	517	// Calculate page size i.e. number of scroll units you get on the
	518	// current client window
	519	int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
	520	if (noPagePositions < 1) noPagePositions = 1;
	521
	522	// Correct position if greater than extent of canvas minus
	523	// the visible portion of it or if below zero
	524	m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
	525	m_yScrollPosition = wxMax( 0, m_yScrollPosition );
	526
	527	m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
	528
	529	m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
	530	}
	531
	532
	533	#ifdef __WXMAC__
	534	m_targetWindow->MacUpdateImmediately() ;
	535	#endif
	536	}
	537
	538	void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
	539	{
	540	m_xScrollingEnabled = x_scroll;
	541	m_yScrollingEnabled = y_scroll;
	542	}
	543
	544	void wxScrolledWindow::GetVirtualSize (int x, int y) const
	545	{
	546	if ( x )
	547	x = m_xScrollPixelsPerLine m_xScrollLines;
	548	if ( y )
	549	y = m_yScrollPixelsPerLine m_yScrollLines;
	550	}
	551
	552	// Where the current view starts from
	553	void wxScrolledWindow::GetViewStart (int x, int y) const
	554	{
	555	if ( x )
	556	*x = m_xScrollPosition;
	557	if ( y )
	558	*y = m_yScrollPosition;
	559	}
	560
	561	void wxScrolledWindow::CalcScrolledPosition(int x, int y, int xx, int yy) const
	562	{
	563	if ( xx )
	564	xx = x - m_xScrollPosition m_xScrollPixelsPerLine;
	565	if ( yy )
	566	yy = y - m_yScrollPosition m_yScrollPixelsPerLine;
	567	}
	568
	569	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int xx, int yy) const
	570	{
	571	if ( xx )
	572	xx = x + m_xScrollPosition m_xScrollPixelsPerLine;
	573	if ( yy )
	574	yy = y + m_yScrollPosition m_yScrollPixelsPerLine;
	575	}