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wxWidgets/src/gtk/scrolwin.cpp
Robert Roebling 0bc0cd5d81 wxScrolledWindow next take, the Gizmo controls 
work again and several other problem have
    been solved, among them at least on reported
    about the old implementation (wrong max size
    due to a rounding error).


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9959 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2001-05-01 16:40:06 +00:00

786 lines
23 KiB
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/////////////////////////////////////////////////////////////////////////////
// Name: generic/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
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "scrolwin.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "wx/utils.h"
#include "wx/dcclient.h"
#include "wx/gtk/scrolwin.h"
#include "wx/panel.h"
#include <gtk/gtk.h>
#include "wx/gtk/win_gtk.h"
// ----------------------------------------------------------------------------
// event tables
// ----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
EVT_SIZE(wxScrolledWindow::OnSize)
EVT_PAINT(wxScrolledWindow::OnPaint)
EVT_CHAR(wxScrolledWindow::OnChar)
END_EVENT_TABLE()
IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
// ============================================================================
// implementation
// ============================================================================
//-----------------------------------------------------------------------------
// data
//-----------------------------------------------------------------------------
extern bool g_blockEventsOnDrag;
//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------
extern void wxapp_install_idle_handler();
extern bool g_isIdle;
//-----------------------------------------------------------------------------
// "value_changed" from m_vAdjust
//-----------------------------------------------------------------------------
static void gtk_scrolled_window_vscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
{
if (g_isIdle)
wxapp_install_idle_handler();
if (g_blockEventsOnDrag) return;
if (!win->m_hasVMT) return;
win->GtkVScroll( adjust->value );
}
//-----------------------------------------------------------------------------
// "value_changed" from m_hAdjust
//-----------------------------------------------------------------------------
static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
{
if (g_isIdle)
wxapp_install_idle_handler();
if (g_blockEventsOnDrag) return;
if (!win->m_hasVMT) return;
win->GtkHScroll( adjust->value );
}
//-----------------------------------------------------------------------------
// InsertChild for wxScrolledWindow
//-----------------------------------------------------------------------------
static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
{
/* the window might have been scrolled already, do we
have to adapt the position */
GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
child->m_x += pizza->xoffset;
child->m_y += pizza->yoffset;
gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
GTK_WIDGET(child->m_widget),
child->m_x,
child->m_y,
child->m_width,
child->m_height );
}
// ----------------------------------------------------------------------------
// wxScrolledWindow creation
// ----------------------------------------------------------------------------
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_targetWindow = (wxWindow*) NULL;
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)
{
if (!PreCreation( parent, pos, size ) ||
!CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
{
wxFAIL_MSG( wxT("wxWindow creation failed") );
return FALSE;
}
m_insertCallback = wxInsertChildInScrolledWindow;
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_targetWindow = this;
m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
scroll_class->scrollbar_spacing = 0;
gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
m_wxwindow = gtk_pizza_new();
gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
if (HasFlag(wxRAISED_BORDER))
{
gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
}
else if (HasFlag(wxSUNKEN_BORDER))
{
gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
}
else if (HasFlag(wxSIMPLE_BORDER))
{
gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
}
else
{
gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
}
GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
m_acceptsFocus = TRUE;
// I _really_ don't want scrollbars in the beginning
m_vAdjust->lower = 0.0;
m_vAdjust->upper = 1.0;
m_vAdjust->value = 0.0;
m_vAdjust->step_increment = 1.0;
m_vAdjust->page_increment = 1.0;
gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
m_hAdjust->lower = 0.0;
m_hAdjust->upper = 1.0;
m_hAdjust->value = 0.0;
m_hAdjust->step_increment = 1.0;
m_hAdjust->page_increment = 1.0;
gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
// these handlers get notified when screen updates are required either when
// scrolling or when the window size (and therefore scrollbar configuration)
// has changed
gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
(GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
(GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
gtk_widget_show( m_wxwindow );
if (m_parent)
m_parent->DoAddChild( this );
PostCreation();
Show( TRUE );
return TRUE;
}
wxScrolledWindow::~wxScrolledWindow()
{
}
// ----------------------------------------------------------------------------
// setting scrolling parameters
// ----------------------------------------------------------------------------
/*
* 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 )
{
m_xScrollPixelsPerLine = pixelsPerUnitX;
m_yScrollPixelsPerLine = pixelsPerUnitY;
m_xScrollPosition = xPos;
m_yScrollPosition = yPos;
m_xScrollLines = noUnitsX;
m_yScrollLines = noUnitsY;
m_hAdjust->lower = 0.0;
m_hAdjust->upper = noUnitsX;
m_hAdjust->value = xPos;
m_hAdjust->step_increment = 1.0;
m_hAdjust->page_increment = 2.0;
m_vAdjust->lower = 0.0;
m_vAdjust->upper = noUnitsY;
m_vAdjust->value = yPos;
m_vAdjust->step_increment = 1.0;
m_vAdjust->page_increment = 2.0;
AdjustScrollbars();
}
void wxScrolledWindow::AdjustScrollbars()
{
int w, h;
m_targetWindow->GetClientSize( &w, &h );
if (m_xScrollPixelsPerLine == 0)
m_hAdjust->page_size = 1.0;
else
m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
if (m_yScrollPixelsPerLine == 0)
m_vAdjust->page_size = 1.0;
else
m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
}
// ----------------------------------------------------------------------------
// target window handling
// ----------------------------------------------------------------------------
void wxScrolledWindow::SetTargetWindow( wxWindow *target )
{
wxASSERT_MSG( target, wxT("target window must not be NULL") );
m_targetWindow = target;
}
wxWindow *wxScrolledWindow::GetTargetWindow()
{
return m_targetWindow;
}
// 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 );
}
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;
}
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();
}
}
void wxScrolledWindow::Scroll( int x_pos, int y_pos )
{
if (!m_targetWindow)
return;
if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
if ((x_pos != -1) && (m_xScrollPixelsPerLine))
{
int old_x = m_xScrollPosition;
m_xScrollPosition = x_pos;
m_hAdjust->value = x_pos;
wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
wxScrollWinEvent event( command, m_xScrollPosition, wxHORIZONTAL );
event.SetEventObject( this );
GetEventHandler()->ProcessEvent( event );
m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
}
if ((y_pos != -1) && (m_yScrollPixelsPerLine))
{
int old_y = m_yScrollPosition;
m_yScrollPosition = y_pos;
m_vAdjust->value = y_pos;
wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
wxScrollWinEvent event( command, m_yScrollPosition, wxVERTICAL );
event.SetEventObject( this );
GetEventHandler()->ProcessEvent( event );
m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
}
}
void wxScrolledWindow::GtkVScroll( float value )
{
if (!m_targetWindow)
return;
if (m_yScrollPixelsPerLine == 0)
return;
int y_pos = (int)(value+0.5);
if (y_pos == m_yScrollPosition)
return;
GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
GtkRange *range = GTK_RANGE(scrolledWindow->vscrollbar);
wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
if (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD) command = wxEVT_SCROLLWIN_LINEDOWN;
else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD) command = wxEVT_SCROLLWIN_PAGEDOWN;
wxScrollWinEvent event( command, y_pos, wxVERTICAL );
event.SetEventObject( this );
GetEventHandler()->ProcessEvent( event );
/*
int old_y = m_yScrollPosition;
m_yScrollPosition = y_pos;
m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
*/
}
void wxScrolledWindow::GtkHScroll( float value )
{
if (!m_targetWindow)
return;
if (m_xScrollPixelsPerLine == 0)
return;
int x_pos = (int)(value+0.5);
if (x_pos == m_xScrollPosition)
return;
GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
GtkRange *range = GTK_RANGE(scrolledWindow->hscrollbar);
wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
if (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD) command = wxEVT_SCROLLWIN_LINEDOWN;
else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD) command = wxEVT_SCROLLWIN_PAGEDOWN;
wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
event.SetEventObject( this );
GetEventHandler()->ProcessEvent( event );
/*
int old_x = m_xScrollPosition;
m_xScrollPosition = x_pos;
m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
*/
}
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;
}
int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
{
int pos = event.GetPosition();
int orient = event.GetOrientation();
int nScrollInc = 0;
if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
{
if (orient == wxHORIZONTAL)
nScrollInc = - m_xScrollPosition;
else
nScrollInc = - m_yScrollPosition;
} else
if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
{
if (orient == wxHORIZONTAL)
nScrollInc = m_xScrollLines - m_xScrollPosition;
else
nScrollInc = m_yScrollLines - m_yScrollPosition;
} else
if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
{
nScrollInc = -1;
} else
if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
{
nScrollInc = 1;
} else
if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
{
if (orient == wxHORIZONTAL)
nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
else
nScrollInc = -GetScrollPageSize(wxVERTICAL);
} else
if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
{
if (orient == wxHORIZONTAL)
nScrollInc = GetScrollPageSize(wxHORIZONTAL);
else
nScrollInc = GetScrollPageSize(wxVERTICAL);
} else
if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
(event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
{
if (orient == wxHORIZONTAL)
nScrollInc = pos - m_xScrollPosition;
else
nScrollInc = pos - m_yScrollPosition;
}
if (orient == wxHORIZONTAL)
{
if (m_xScrollPixelsPerLine > 0)
{
int w, h;
m_targetWindow->GetClientSize(&w, &h);
int noPositions = (int)(m_hAdjust->upper - m_hAdjust->page_size + 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 noPositions = (int)(m_vAdjust->upper - m_vAdjust->page_size + 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;
}
void wxScrolledWindow::SetScrollPos( int orient, int pos, bool WXUNUSED(refresh) )
{
wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
if (orient == wxHORIZONTAL)
{
float fpos = (float)pos;
if (fpos > m_hAdjust->upper - m_hAdjust->page_size) fpos = m_hAdjust->upper - m_hAdjust->page_size;
if (fpos < 0.0) fpos = 0.0;
if (fabs(fpos-m_hAdjust->value) < 0.2) return;
m_hAdjust->value = fpos;
}
else
{
float fpos = (float)pos;
if (fpos > m_vAdjust->upper - m_vAdjust->page_size) fpos = m_vAdjust->upper - m_vAdjust->page_size;
if (fpos < 0.0) fpos = 0.0;
if (fabs(fpos-m_vAdjust->value) < 0.2) return;
m_vAdjust->value = fpos;
}
if (m_wxwindow->window)
{
if (orient == wxHORIZONTAL)
{
gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
(GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
(GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
}
else
{
gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
(GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
(GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
}
}
}
// ----------------------------------------------------------------------------
// event handlers
// ----------------------------------------------------------------------------
// 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);
}
// kbd handling: notice that we use OnChar() and not OnKeyDown() for
// compatibility here - if we used OnKeyDown(), the programs which process
// arrows themselves in their OnChar() would never get the message and like
// this they always have the priority
void wxScrolledWindow::OnChar(wxKeyEvent& event)
{
int stx, sty, // view origin
szx, szy, // view size (total)
clix, cliy; // view size (on screen)
ViewStart(&stx, &sty);
GetClientSize(&clix, &cliy);
GetVirtualSize(&szx, &szy);
if( m_xScrollPixelsPerLine )
{
clix /= m_xScrollPixelsPerLine;
szx /= m_xScrollPixelsPerLine;
}
else
{
clix = 0;
szx = -1;
}
if( m_yScrollPixelsPerLine )
{
cliy /= m_yScrollPixelsPerLine;
szy /= m_yScrollPixelsPerLine;
}
else
{
cliy = 0;
szy = -1;
}
int dsty;
switch ( event.KeyCode() )
{
case WXK_PAGEUP:
case WXK_PRIOR:
dsty = sty - (5 * cliy / 6);
Scroll(-1, (dsty == -1) ? 0 : dsty);
break;
case WXK_PAGEDOWN:
case WXK_NEXT:
Scroll(-1, sty + (5 * cliy / 6));
break;
case WXK_HOME:
Scroll(0, event.ControlDown() ? 0 : -1);
break;
case WXK_END:
Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
break;
case WXK_UP:
Scroll(-1, sty - 1);
break;
case WXK_DOWN:
Scroll(-1, sty + 1);
break;
case WXK_LEFT:
Scroll(stx - 1, -1);
break;
case WXK_RIGHT:
Scroll(stx + 1, -1);
break;
default:
// not for us
event.Skip();
}
}
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