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 __WXMSW__
#include "windows.h"
#endif

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/generic/scrolwin.h"

#if !USE_SHARED_LIBRARY
BEGIN_EVENT_TABLE(wxScrolledWindow, wxWindow)
  EVT_SCROLL(wxScrolledWindow::OnScroll)
  EVT_SIZE(wxScrolledWindow::OnSize)
  EVT_PAINT(wxScrolledWindow::OnPaint)
END_EVENT_TABLE()

IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxWindow)
#endif

wxScrolledWindow::wxScrolledWindow(void)
{
  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;

  return wxWindow::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_xScrollPosition) ||
      (noUnitsY != 0 && m_yScrollLines == 0) ||
      (noUnitsY < m_yScrollPosition) ||
      (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;

   AdjustScrollbars();

   if (do_refresh && !noRefresh) Refresh();

#ifdef __WXMSW__
    UpdateWindow ((HWND) GetHWND());
#endif
}

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

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

    // TODO: should we store the scroll position here as well as in wxWindow?
  if (orient == wxHORIZONTAL)
  {
    int newPos = m_xScrollPosition + nScrollInc;
    SetScrollPos(wxHORIZONTAL, newPos, TRUE );
  }
  else
  {
    int newPos = m_yScrollPosition + nScrollInc;
    SetScrollPos(wxVERTICAL, newPos, TRUE );
  }

/*
  // TODO We need to multiply the ScrollWindow amount by the scaling
  // factor, but how do we know what this is in wxWin 2.0???
  float scaleX = 1.0;
  float scaleY = 1.0;

  if ( this->IsKindOf(CLASSINFO(wxCanvas)) )
  {
    wxDC* dc = ((wxCanvas *)this)->GetDC();
    dc->GetUserScale(&scaleX, &scaleY);
  }
*/

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

  if (orient == wxHORIZONTAL)
  {
    if (m_xScrollingEnabled)
      ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
    else
      Refresh();
  }
  else
  {
    if (m_yScrollingEnabled)
      ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
    else
      Refresh();
  }

}

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

  int nScrollInc = 0;
  switch (event.GetEventType())
  {
    case wxEVENT_TYPE_SCROLL_TOP:
    {
      if (orient == wxHORIZONTAL)
        nScrollInc = - m_xScrollPosition;
      else
        nScrollInc = - m_yScrollPosition;
      break;
    }
    case wxEVENT_TYPE_SCROLL_BOTTOM:
    {
      if (orient == wxHORIZONTAL)
        nScrollInc = m_xScrollLines - m_xScrollPosition;
      else
        nScrollInc = m_yScrollLines - m_yScrollPosition;
      break;
    }
    case wxEVENT_TYPE_SCROLL_LINEUP:
    {
      nScrollInc = -1;
      break;
    }
    case wxEVENT_TYPE_SCROLL_LINEDOWN:
    {
      nScrollInc = 1;
      break;
    }
    case wxEVENT_TYPE_SCROLL_PAGEUP:
    {
      if (orient == wxHORIZONTAL)
        nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
      else
        nScrollInc = -GetScrollPageSize(wxVERTICAL);
      break;
    }
    case wxEVENT_TYPE_SCROLL_PAGEDOWN:
    {
      if (orient == wxHORIZONTAL)
        nScrollInc = GetScrollPageSize(wxHORIZONTAL);
      else
        nScrollInc = GetScrollPageSize(wxVERTICAL);
      break;
    }
    case wxEVENT_TYPE_SCROLL_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;
      GetClientSize(&w, &h);

      int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
      int noPositions = (int) ( ((nMaxWidth - w)/(float)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
      Refresh();
  }
  else
  {
    if (m_yScrollPixelsPerLine > 0) {
      int w, h;
      GetClientSize(&w, &h);

      int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
      int noPositions = (int) ( ((nMaxHeight - h)/(float)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
      Refresh();
  }

  return nScrollInc;
}

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

  // Recalculate scroll bar range and position
  if (m_xScrollLines > 0)
  {
    int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
    int newRange = (int) ( ((nMaxWidth)/(float)m_xScrollPixelsPerLine) + 0.5 );
    if (newRange < 0)
      newRange = 0;

    m_xScrollPosition = wxMin(newRange, m_xScrollPosition);

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

    SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, newRange);
    SetScrollPageSize(wxHORIZONTAL, noPagePositions);
  }
  // Robert Roebling
  else
  {
    m_xScrollPosition = 0;
    SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
  }

  if (m_yScrollLines > 0)
  {
    int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
    int newRange = (int) ( ((nMaxHeight)/(float)m_yScrollPixelsPerLine) + 0.5 );
    if (newRange < 0)
      newRange = 0;

    m_yScrollPosition = wxMin(newRange, m_yScrollPosition);

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

    SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, newRange);
    SetScrollPageSize(wxVERTICAL, noPagePositions);
  }
  else
  {
    m_yScrollPosition = 0;
    SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);  // Robert Roebling
  }

}

// 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);
}
#endif

void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
{
      *x_unit = m_xScrollPixelsPerLine;
      *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)
{
  int old_x, old_y;
  ViewStart (&old_x, &old_y);
  if (((x_pos == -1) || (x_pos == old_x)) && ((y_pos == -1) || (y_pos == old_y)))
    return;

  if (x_pos > -1)
    {
      m_xScrollPosition = x_pos;
      SetScrollPos (wxHORIZONTAL, x_pos, TRUE);
    }
  if (y_pos > -1)
    {
      m_yScrollPosition = y_pos;
      SetScrollPos (wxVERTICAL, y_pos, TRUE);
    }
  Refresh();
#ifdef __WXMSW__
  ::UpdateWindow ((HWND) GetHWND());
#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
{
      *x = m_xScrollPixelsPerLine * m_xScrollLines;
      *y = m_yScrollPixelsPerLine * m_yScrollLines;
}

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

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

void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
{
  *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
  *yy = (float)(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 __WXMSW__
	24	#include "windows.h"
	25	#endif
	26
	27	#ifdef __BORLANDC__
	28	#pragma hdrstop
	29	#endif
	30
	31	#include "wx/generic/scrolwin.h"
	32
	33	#if !USE_SHARED_LIBRARY
	34	BEGIN_EVENT_TABLE(wxScrolledWindow, wxWindow)
	35	EVT_SCROLL(wxScrolledWindow::OnScroll)
	36	EVT_SIZE(wxScrolledWindow::OnSize)
	37	EVT_PAINT(wxScrolledWindow::OnPaint)
	38	END_EVENT_TABLE()
	39
	40	IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxWindow)
	41	#endif
	42
	43	wxScrolledWindow::wxScrolledWindow(void)
	44	{
	45	m_xScrollPixelsPerLine = 0;
	46	m_yScrollPixelsPerLine = 0;
	47	m_xScrollingEnabled = TRUE;
	48	m_yScrollingEnabled = TRUE;
	49	m_xScrollPosition = 0;
	50	m_yScrollPosition = 0;
	51	m_xScrollLines = 0;
	52	m_yScrollLines = 0;
	53	m_xScrollLinesPerPage = 0;
	54	m_yScrollLinesPerPage = 0;
	55	m_scaleX = 1.0;
	56	m_scaleY = 1.0;
	57	}
	58
	59	bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
	60	const wxPoint& pos,
	61	const wxSize& size,
	62	long style,
	63	const wxString& name)
	64	{
	65	m_xScrollPixelsPerLine = 0;
	66	m_yScrollPixelsPerLine = 0;
	67	m_xScrollingEnabled = TRUE;
	68	m_yScrollingEnabled = TRUE;
	69	m_xScrollPosition = 0;
	70	m_yScrollPosition = 0;
	71	m_xScrollLines = 0;
	72	m_yScrollLines = 0;
	73	m_xScrollLinesPerPage = 0;
	74	m_yScrollLinesPerPage = 0;
	75	m_scaleX = 1.0;
	76	m_scaleY = 1.0;
	77
	78	return wxWindow::Create(parent, id, pos, size, style, name);
	79	}
	80
	81	/*
	82	* pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
	83	* noUnitsX/noUnitsY: : no. units per scrollbar
	84	*/
	85	void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
	86	int noUnitsX, int noUnitsY,
	87	int xPos, int yPos, bool noRefresh )
	88	{
	89	bool do_refresh =
	90	(
	91	(noUnitsX != 0 && m_xScrollLines == 0) \|\|
	92	(noUnitsX < m_xScrollPosition) \|\|
	93	(noUnitsY != 0 && m_yScrollLines == 0) \|\|
	94	(noUnitsY < m_yScrollPosition) \|\|
	95	(xPos != m_xScrollPosition) \|\|
	96	(yPos != m_yScrollPosition) \|\|
	97	(pixelsPerUnitX != m_xScrollPixelsPerLine) \|\|
	98	(pixelsPerUnitY != m_yScrollPixelsPerLine)
	99	);
	100
	101	m_xScrollPixelsPerLine = pixelsPerUnitX;
	102	m_yScrollPixelsPerLine = pixelsPerUnitY;
	103	m_xScrollPosition = xPos;
	104	m_yScrollPosition = yPos;
	105	m_xScrollLines = noUnitsX;
	106	m_yScrollLines = noUnitsY;
	107
	108	AdjustScrollbars();
	109
	110	if (do_refresh && !noRefresh) Refresh();
	111
	112	#ifdef __WXMSW__
	113	UpdateWindow ((HWND) GetHWND());
	114	#endif
	115	}
	116
	117	void wxScrolledWindow::OnScroll(wxScrollEvent& event)
	118	{
	119	int orient = event.GetOrientation();
	120
	121	int nScrollInc = CalcScrollInc(event);
	122	if (nScrollInc == 0)
	123	return;
	124
	125	// TODO: should we store the scroll position here as well as in wxWindow?
	126	if (orient == wxHORIZONTAL)
	127	{
	128	int newPos = m_xScrollPosition + nScrollInc;
	129	SetScrollPos(wxHORIZONTAL, newPos, TRUE );
	130	}
	131	else
	132	{
	133	int newPos = m_yScrollPosition + nScrollInc;
	134	SetScrollPos(wxVERTICAL, newPos, TRUE );
	135	}
	136
	137	/*
	138	// TODO We need to multiply the ScrollWindow amount by the scaling
	139	// factor, but how do we know what this is in wxWin 2.0???
	140	float scaleX = 1.0;
	141	float scaleY = 1.0;
	142
	143	if ( this->IsKindOf(CLASSINFO(wxCanvas)) )
	144	{
	145	wxDC* dc = ((wxCanvas *)this)->GetDC();
	146	dc->GetUserScale(&scaleX, &scaleY);
	147	}
	148	*/
	149
	150	if (orient == wxHORIZONTAL)
	151	{
	152	m_xScrollPosition += nScrollInc;
	153	}
	154	else
	155	{
	156	m_yScrollPosition += nScrollInc;
	157	}
	158
	159	if (orient == wxHORIZONTAL)
	160	{
	161	if (m_xScrollingEnabled)
	162	ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
	163	else
	164	Refresh();
	165	}
	166	else
	167	{
	168	if (m_yScrollingEnabled)
	169	ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
	170	else
	171	Refresh();
	172	}
	173
	174	}
	175
	176	int wxScrolledWindow::CalcScrollInc(wxScrollEvent& event)
	177	{
	178	int pos = event.GetPosition();
	179	int orient = event.GetOrientation();
	180
	181	int nScrollInc = 0;
	182	switch (event.GetEventType())
	183	{
	184	case wxEVENT_TYPE_SCROLL_TOP:
	185	{
	186	if (orient == wxHORIZONTAL)
	187	nScrollInc = - m_xScrollPosition;
	188	else
	189	nScrollInc = - m_yScrollPosition;
	190	break;
	191	}
	192	case wxEVENT_TYPE_SCROLL_BOTTOM:
	193	{
	194	if (orient == wxHORIZONTAL)
	195	nScrollInc = m_xScrollLines - m_xScrollPosition;
	196	else
	197	nScrollInc = m_yScrollLines - m_yScrollPosition;
	198	break;
	199	}
	200	case wxEVENT_TYPE_SCROLL_LINEUP:
	201	{
	202	nScrollInc = -1;
	203	break;
	204	}
	205	case wxEVENT_TYPE_SCROLL_LINEDOWN:
	206	{
	207	nScrollInc = 1;
	208	break;
	209	}
	210	case wxEVENT_TYPE_SCROLL_PAGEUP:
	211	{
	212	if (orient == wxHORIZONTAL)
	213	nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
	214	else
	215	nScrollInc = -GetScrollPageSize(wxVERTICAL);
	216	break;
	217	}
	218	case wxEVENT_TYPE_SCROLL_PAGEDOWN:
	219	{
	220	if (orient == wxHORIZONTAL)
	221	nScrollInc = GetScrollPageSize(wxHORIZONTAL);
	222	else
	223	nScrollInc = GetScrollPageSize(wxVERTICAL);
	224	break;
	225	}
	226	case wxEVENT_TYPE_SCROLL_THUMBTRACK:
	227	{
	228	if (orient == wxHORIZONTAL)
	229	nScrollInc = pos - m_xScrollPosition;
	230	else
	231	nScrollInc = pos - m_yScrollPosition;
	232	break;
	233	}
	234	default:
	235	{
	236	break;
	237	}
	238	}
	239	if (orient == wxHORIZONTAL)
	240	{
	241	if (m_xScrollPixelsPerLine > 0) {
	242	int w, h;
	243	GetClientSize(&w, &h);
	244
	245	int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
	246	int noPositions = (int) ( ((nMaxWidth - w)/(float)m_xScrollPixelsPerLine) + 0.5 );
	247	if (noPositions < 0)
	248	noPositions = 0;
	249
	250	if ( (m_xScrollPosition + nScrollInc) < 0 )
	251	nScrollInc = -m_xScrollPosition; // As -ve as we can go
	252	else if ( (m_xScrollPosition + nScrollInc) > noPositions )
	253	nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
	254	}
	255	else
	256	Refresh();
	257	}
	258	else
	259	{
	260	if (m_yScrollPixelsPerLine > 0) {
	261	int w, h;
	262	GetClientSize(&w, &h);
	263
	264	int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
	265	int noPositions = (int) ( ((nMaxHeight - h)/(float)m_yScrollPixelsPerLine) + 0.5 );
	266	if (noPositions < 0)
	267	noPositions = 0;
	268
	269	if ( (m_yScrollPosition + nScrollInc) < 0 )
	270	nScrollInc = -m_yScrollPosition; // As -ve as we can go
	271	else if ( (m_yScrollPosition + nScrollInc) > noPositions )
	272	nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
	273	}
	274	else
	275	Refresh();
	276	}
	277
	278	return nScrollInc;
	279	}
	280
	281	// Adjust the scrollbars - new version.
	282	void wxScrolledWindow::AdjustScrollbars(void)
	283	{
	284	int w, h;
	285	GetClientSize(&w, &h);
	286
	287	// Recalculate scroll bar range and position
	288	if (m_xScrollLines > 0)
	289	{
	290	int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
	291	int newRange = (int) ( ((nMaxWidth)/(float)m_xScrollPixelsPerLine) + 0.5 );
	292	if (newRange < 0)
	293	newRange = 0;
	294
	295	m_xScrollPosition = wxMin(newRange, m_xScrollPosition);
	296
	297	// Calculate page size i.e. number of scroll units you get on the
	298	// current client window
	299	int noPagePositions = (int) ( (w/(float)m_xScrollPixelsPerLine) + 0.5 );
	300	if (noPagePositions < 1)
	301	noPagePositions = 1;
	302
	303	SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, newRange);
	304	SetScrollPageSize(wxHORIZONTAL, noPagePositions);
	305	}
	306	// Robert Roebling
	307	else
	308	{
	309	m_xScrollPosition = 0;
	310	SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
	311	}
	312
	313	if (m_yScrollLines > 0)
	314	{
	315	int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
	316	int newRange = (int) ( ((nMaxHeight)/(float)m_yScrollPixelsPerLine) + 0.5 );
	317	if (newRange < 0)
	318	newRange = 0;
	319
	320	m_yScrollPosition = wxMin(newRange, m_yScrollPosition);
	321
	322	// Calculate page size i.e. number of scroll units you get on the
	323	// current client window
	324	int noPagePositions = (int) ( (h/(float)m_yScrollPixelsPerLine) + 0.5 );
	325	if (noPagePositions < 1)
	326	noPagePositions = 1;
	327
	328	SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, newRange);
	329	SetScrollPageSize(wxVERTICAL, noPagePositions);
	330	}
	331	else
	332	{
	333	m_yScrollPosition = 0;
	334	SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE); // Robert Roebling
	335	}
	336
	337	}
	338
	339	// Default OnSize resets scrollbars, if any
	340	void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
	341	{
	342	#if wxUSE_CONSTRAINTS
	343	if (GetAutoLayout())
	344	Layout();
	345	#endif
	346
	347	AdjustScrollbars();
	348	}
	349
	350	// This calls OnDraw, having adjusted the origin according to the current
	351	// scroll position
	352	void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
	353	{
	354	wxPaintDC dc(this);
	355	PrepareDC(dc);
	356
	357	OnDraw(dc);
	358	}
	359
	360	// Override this function if you don't want to have wxScrolledWindow
	361	// automatically change the origin according to the scroll position.
	362	void wxScrolledWindow::PrepareDC(wxDC& dc)
	363	{
	364	dc.SetDeviceOrigin(- m_xScrollPosition * m_xScrollPixelsPerLine, - m_yScrollPosition * m_yScrollPixelsPerLine);
	365	dc.SetUserScale(m_scaleX, m_scaleY);
	366	}
	367
	368	#if WXWIN_COMPATIBILITY
	369	void wxScrolledWindow::GetScrollUnitsPerPage (int x_page, int y_page) const
	370	{
	371	*x_page = GetScrollPageSize(wxHORIZONTAL);
	372	*y_page = GetScrollPageSize(wxVERTICAL);
	373	}
	374	#endif
	375
	376	void wxScrolledWindow::GetScrollPixelsPerUnit (int x_unit, int y_unit) const
	377	{
	378	*x_unit = m_xScrollPixelsPerLine;
	379	*y_unit = m_yScrollPixelsPerLine;
	380	}
	381
	382	int wxScrolledWindow::GetScrollPageSize(int orient) const
	383	{
	384	if ( orient == wxHORIZONTAL )
	385	return m_xScrollLinesPerPage;
	386	else
	387	return m_yScrollLinesPerPage;
	388	}
	389
	390	void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
	391	{
	392	if ( orient == wxHORIZONTAL )
	393	m_xScrollLinesPerPage = pageSize;
	394	else
	395	m_yScrollLinesPerPage = pageSize;
	396	}
	397
	398	/*
	399	* Scroll to given position (scroll position, not pixel position)
	400	*/
	401	void wxScrolledWindow::Scroll (int x_pos, int y_pos)
	402	{
	403	int old_x, old_y;
	404	ViewStart (&old_x, &old_y);
	405	if (((x_pos == -1) \|\| (x_pos == old_x)) && ((y_pos == -1) \|\| (y_pos == old_y)))
	406	return;
	407
	408	if (x_pos > -1)
	409	{
	410	m_xScrollPosition = x_pos;
	411	SetScrollPos (wxHORIZONTAL, x_pos, TRUE);
	412	}
	413	if (y_pos > -1)
	414	{
	415	m_yScrollPosition = y_pos;
	416	SetScrollPos (wxVERTICAL, y_pos, TRUE);
	417	}
	418	Refresh();
	419	#ifdef __WXMSW__
	420	::UpdateWindow ((HWND) GetHWND());
	421	#endif
	422	}
	423
	424	void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
	425	{
	426	m_xScrollingEnabled = x_scroll;
	427	m_yScrollingEnabled = y_scroll;
	428	}
	429
	430	void wxScrolledWindow::GetVirtualSize (int x, int y) const
	431	{
	432	x = m_xScrollPixelsPerLine m_xScrollLines;
	433	y = m_yScrollPixelsPerLine m_yScrollLines;
	434	}
	435
	436	// Where the current view starts from
	437	void wxScrolledWindow::ViewStart (int x, int y) const
	438	{
	439	*x = m_xScrollPosition;
	440	*y = m_yScrollPosition;
	441	}
	442
	443	void wxScrolledWindow::CalcScrolledPosition(int x, int y, int xx, int yy) const
	444	{
	445	xx = x - m_xScrollPosition m_xScrollPixelsPerLine;
	446	yy = y - m_yScrollPosition m_yScrollPixelsPerLine;
	447	}
	448
	449	void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float xx, float yy) const
	450	{
	451	xx = (float)(x + m_xScrollPosition m_xScrollPixelsPerLine);
	452	yy = (float)(y + m_yScrollPosition m_yScrollPixelsPerLine);
	453	}
	454
	455