// Name: generic/scrolwin.cpp
// Purpose: wxGenericScrolledWindow implementation
// Author: Julian Smart
-// Modified by: Vadim Zeitlin on 31.08.00: wxScrollHelper allows to implement
+// Modified by: Vadim Zeitlin on 31.08.00: wxScrollHelper allows to implement.
+// Ron Lee on 10.4.02: virtual size / auto scrollbars et al.
// Created: 01/02/97
// RCS-ID: $Id$
// Copyright: (c) wxWindows team
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
#include "wx/scrolwin.h"
#include "wx/panel.h"
#include "wx/timer.h"
+#include "wx/sizer.h"
#ifdef __WXMSW__
#include <windows.h> // for DLGC_WANTARROWS
wxScrollHelper *m_scrollHelper;
bool m_hasDrawnWindow;
+
+ DECLARE_NO_COPY_CLASS(wxScrollHelperEvtHandler)
};
// ----------------------------------------------------------------------------
wxEventType m_eventType;
int m_pos,
m_orient;
+
+ DECLARE_NO_COPY_CLASS(wxAutoScrollTimer)
};
// ============================================================================
{
wxEventType evType = event.GetEventType();
- // always process the size events ourselves, even if the user code handles
- // them as well, as we need to AdjustScrollbars()
- if ( evType == wxEVT_SIZE )
- {
- m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
- }
-
// the explanation of wxEVT_PAINT processing hack: for historic reasons
// there are 2 ways to process this event in classes deriving from
// wxScrolledWindow. The user code may
// user code defined OnPaint() in the derived class)
m_hasDrawnWindow = TRUE;
- if ( wxEvtHandler::ProcessEvent(event) )
+ // pass it on to the real handler
+ bool processed = wxEvtHandler::ProcessEvent(event);
+
+ // always process the size events ourselves, even if the user code handles
+ // them as well, as we need to AdjustScrollbars()
+ //
+ // NB: it is important to do it after processing the event in the normal
+ // way as HandleOnSize() may generate a wxEVT_SIZE itself if the
+ // scrollbar[s] (dis)appear and it should be seen by the user code
+ // after this one
+ if ( evType == wxEVT_SIZE )
+ {
+ m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
+
+ return TRUE;
+ }
+
+ if ( processed )
{
// normally, nothing more to do here - except if it was a paint event
// which wasn't really processed, then we'll try to call our
bool do_refresh =
(
(noUnitsX != 0 && m_xScrollLines == 0) ||
- (noUnitsX < m_xScrollLines && xpos > pixelsPerUnitX*noUnitsX) ||
+ (noUnitsX < m_xScrollLines && xpos > pixelsPerUnitX * noUnitsX) ||
(noUnitsY != 0 && m_yScrollLines == 0) ||
- (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY*noUnitsY) ||
+ (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY * noUnitsY) ||
(xPos != m_xScrollPosition) ||
(yPos != m_yScrollPosition)
);
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_targetWindow->GetWindowStyle() & wxRETAINED )
- {
- Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
+ int w = noUnitsX * pixelsPerUnitX;
+ int h = noUnitsY * pixelsPerUnitY;
- int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
- int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
- if (m_targetWindow->GetBackingPixmap() &&
- !((m_targetWindow->GetPixmapWidth() == totalPixelWidth) &&
- (m_targetWindow->GetPixmapHeight() == totalPixelHeight)))
- {
- XFreePixmap (dpy, (Pixmap) m_targetWindow->GetBackingPixmap());
- m_targetWindow->SetBackingPixmap((WXPixmap) 0);
- }
+ // For better backward compatibility we set persisting limits
+ // here not just the size. It makes SetScrollbars 'sticky'
+ // emulating the old non-autoscroll behaviour.
- if (!m_targetWindow->GetBackingPixmap() &&
- (noUnitsX != 0) && (noUnitsY != 0))
- {
- int depth = wxDisplayDepth();
- m_targetWindow->SetPixmapWidth(totalPixelWidth);
- m_targetWindow->SetPixmapHeight(totalPixelHeight);
- m_targetWindow->SetBackingPixmap((WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
- m_targetWindow->GetPixmapWidth(), m_targetWindow->GetPixmapHeight(), depth));
- }
+ m_targetWindow->SetVirtualSizeHints( w, h );
- }
-#endif // Motif
+ // The above should arguably be deprecated, this however we still need.
- AdjustScrollbars();
+ m_targetWindow->SetVirtualSize( w, h );
if (do_refresh && !noRefresh)
m_targetWindow->Refresh(TRUE, GetRect());
+ // TODO: check if we can use AdjustScrollbars always.
+#ifdef __WXUNIVERSAL__
+ AdjustScrollbars();
+#else
+ // This is also done by AdjustScrollbars, above
#ifdef __WXMAC__
m_targetWindow->MacUpdateImmediately() ;
#endif
+#endif
}
// ----------------------------------------------------------------------------
-// target window handling
+// [target] window handling
// ----------------------------------------------------------------------------
void wxScrollHelper::DeleteEvtHandler()
{
- // FIXME: we should search for m_handler in the handler list
- if ( m_targetWindow )
+ // search for m_handler in the handler list
+ if ( m_win && m_handler )
{
- m_targetWindow->PopEventHandler(TRUE /* Delete old event handler*/);
+ if ( m_win->RemoveEventHandler(m_handler) )
+ {
+ delete m_handler;
+ }
+ //else: something is very wrong, so better [maybe] leak memory than
+ // risk a crash because of double deletion
+
+ m_handler = NULL;
}
}
m_win = win;
+ // by default, the associated window is also the target window
DoSetTargetWindow(win);
}
m_targetWindow = target;
// install the event handler which will intercept the events we're
- // interested in
- m_handler = new wxScrollHelperEvtHandler(this);
- m_targetWindow->PushEventHandler(m_handler);
+ // interested in (but only do it for our real window, not the target window
+ // which we scroll - we don't need to hijack its events)
+ if ( m_targetWindow == m_win )
+ {
+ // if we already have a handler, delete it first
+ DeleteEvtHandler();
+
+ m_handler = new wxScrollHelperEvtHandler(this);
+ m_targetWindow->PushEventHandler(m_handler);
+ }
}
-void wxScrollHelper::SetTargetWindow( wxWindow *target )
+void wxScrollHelper::SetTargetWindow(wxWindow *target)
{
wxCHECK_RET( target, wxT("target window must not be NULL") );
if ( target == m_targetWindow )
return;
- DeleteEvtHandler();
-
DoSetTargetWindow(target);
}
if (orient == wxHORIZONTAL)
{
m_xScrollPosition += nScrollInc;
- m_targetWindow->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
+ m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
}
else
{
m_yScrollPosition += nScrollInc;
- m_targetWindow->SetScrollPos(wxVERTICAL, m_yScrollPosition);
+ m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
}
bool needsRefresh = FALSE;
m_targetWindow->MacUpdateImmediately();
#endif
- int w, h;
- GetTargetSize(&w, &h);
+ int w = 0, h = 0;
+ int oldw, oldh;
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;
- if ( noPagePositions > m_xScrollLines )
- noPagePositions = m_xScrollLines;
+ do {
+ GetTargetSize(&w, 0);
- // 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 );
+ if (m_xScrollPixelsPerLine == 0)
+ {
+ m_xScrollLines = 0;
+ m_xScrollPosition = 0;
+ m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
+ }
+ else
+ {
+ m_xScrollLines = m_targetWindow->GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine;
+
+ // 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;
+ if ( noPagePositions > m_xScrollLines )
+ noPagePositions = m_xScrollLines;
+
+ // 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_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
+ // The amount by which we scroll when paging
+ SetScrollPageSize(wxHORIZONTAL, noPagePositions);
+ }
- m_targetWindow->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
- // The amount by which we scroll when paging
- SetScrollPageSize(wxHORIZONTAL, noPagePositions);
- }
- else
- {
- m_xScrollPosition = 0;
- m_targetWindow->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
- }
+ GetTargetSize(0, &h);
- 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;
- if ( noPagePositions > m_yScrollLines )
- noPagePositions = m_yScrollLines;
+ if (m_yScrollPixelsPerLine == 0)
+ {
+ m_yScrollLines = 0;
+ m_yScrollPosition = 0;
+ m_win->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
+ }
+ else
+ {
+ m_yScrollLines = m_targetWindow->GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine;
+
+ // 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;
+ if ( noPagePositions > m_yScrollLines )
+ noPagePositions = m_yScrollLines;
+
+ // 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_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
+ // The amount by which we scroll when paging
+ SetScrollPageSize(wxVERTICAL, noPagePositions);
+ }
- // 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 );
+ // If a scrollbar (dis)appeared as a result of this, adjust them again.
- m_targetWindow->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
- // The amount by which we scroll when paging
- SetScrollPageSize(wxVERTICAL, noPagePositions);
- }
- else
+ oldw = w;
+ oldh = h;
+
+ GetTargetSize( &w, &h );
+ } while ( w != oldw && h != oldh );
+
+#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_targetWindow->GetWindowStyle() & wxRETAINED )
{
- m_yScrollPosition = 0;
- m_targetWindow->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
+ Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
+
+ int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
+ int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
+ if (m_targetWindow->GetBackingPixmap() &&
+ !((m_targetWindow->GetPixmapWidth() == totalPixelWidth) &&
+ (m_targetWindow->GetPixmapHeight() == totalPixelHeight)))
+ {
+ XFreePixmap (dpy, (Pixmap) m_targetWindow->GetBackingPixmap());
+ m_targetWindow->SetBackingPixmap((WXPixmap) 0);
+ }
+
+ if (!m_targetWindow->GetBackingPixmap() &&
+ (m_xScrollLines != 0) && (m_yScrollLines != 0))
+ {
+ int depth = wxDisplayDepth();
+ m_targetWindow->SetPixmapWidth(totalPixelWidth);
+ m_targetWindow->SetPixmapHeight(totalPixelHeight);
+ m_targetWindow->SetBackingPixmap((WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
+ m_targetWindow->GetPixmapWidth(), m_targetWindow->GetPixmapHeight(), depth));
+ }
+
}
+#endif // Motif
if (oldXScroll != m_xScrollPosition)
{
if (m_xScrollingEnabled)
- m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0,
+ m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
GetRect() );
else
m_targetWindow->Refresh(TRUE, GetRect());
dc.SetUserScale( m_scaleX, m_scaleY );
}
+void wxScrollHelper::SetScrollRate( int xstep, int ystep )
+{
+ int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
+ int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
+
+ m_xScrollPixelsPerLine = xstep;
+ m_yScrollPixelsPerLine = ystep;
+
+ int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
+ int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
+
+ m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
+ m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
+ m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
+
+ AdjustScrollbars();
+}
+
void wxScrollHelper::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
{
if ( x_unit )
m_xScrollPosition = wxMax( 0, m_xScrollPosition );
if (old_x != m_xScrollPosition) {
- m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
+ m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
GetRect() );
}
m_yScrollPosition = wxMax( 0, m_yScrollPosition );
if (old_y != m_yScrollPosition) {
- m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition );
+ m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
GetRect() );
}
m_yScrollingEnabled = y_scroll;
}
-void wxScrollHelper::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 wxScrollHelper::GetViewStart (int *x, int *y) const
{
*y = m_yScrollPosition;
}
-void wxScrollHelper::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
+void wxScrollHelper::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
{
if ( xx )
*xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
*yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
}
-void wxScrollHelper::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
+void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
{
if ( xx )
*xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
// Default OnSize resets scrollbars, if any
void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
{
-#if wxUSE_CONSTRAINTS
- if ( m_targetWindow->GetAutoLayout() )
- m_targetWindow->Layout();
-#endif
+ if( m_win->GetAutoLayout() || m_targetWindow->GetAutoLayout() )
+ {
+ if ( m_targetWindow != m_win )
+ m_targetWindow->FitInside();
- AdjustScrollbars();
+ m_win->FitInside();
+
+ // FIXME: Something is really weird here... This should be
+ // called by FitInside above (and apparently is), yet the
+ // scrollsub sample will get the scrollbar wrong if resized
+ // quickly. This masks the bug, but is surely not the right
+ // answer at all.
+ AdjustScrollbars();
+ }
+ else
+ AdjustScrollbars();
}
// This calls OnDraw, having adjusted the origin according to the current
// scroll position
void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
{
- wxPaintDC dc(m_targetWindow);
+ // don't use m_targetWindow here, this is always called for ourselves
+ wxPaintDC dc(m_win);
DoPrepareDC(dc);
OnDraw(dc);
GetViewStart(&stx, &sty);
GetTargetSize(&clix, &cliy);
- GetVirtualSize(&szx, &szy);
+ m_targetWindow->GetVirtualSize(&szx, &szy);
if( m_xScrollPixelsPerLine )
{
yScrollOld = m_yScrollPosition;
int dsty;
- switch ( event.KeyCode() )
+ switch ( event.GetKeyCode() )
{
case WXK_PAGEUP:
case WXK_PRIOR:
if (lines != 0)
{
- lines *= event.GetLinesPerAction();
wxScrollWinEvent newEvent;
newEvent.SetPosition(0);
newEvent.SetOrientation(wxVERTICAL);
newEvent.m_eventObject = m_win;
- if (lines > 0)
- newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
- else
- newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
- int times = abs(lines);
- for (; times > 0; times --)
+ if (event.IsPageScroll())
+ {
+ if (lines > 0)
+ newEvent.m_eventType = wxEVT_SCROLLWIN_PAGEUP;
+ else
+ newEvent.m_eventType = wxEVT_SCROLLWIN_PAGEDOWN;
+
m_win->GetEventHandler()->ProcessEvent(newEvent);
+ }
+ else
+ {
+ lines *= event.GetLinesPerAction();
+ if (lines > 0)
+ newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
+ else
+ newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
- /* Old Way */
- // int vsx, vsy;
- // GetViewStart(&vsx, &vsy);
- // Scroll(-1, vsy - lines);
+ int times = abs(lines);
+ for (; times > 0; times--)
+ m_win->GetEventHandler()->ProcessEvent(newEvent);
+ }
}
}
bool ok = wxPanel::Create(parent, id, pos, size, style, name);
-#ifdef __WXMSW__
- // we need to process arrows ourselves for scrolling
- m_lDlgCode |= DLGC_WANTARROWS;
-#endif // __WXMSW__
-
return ok;
}
{
}
+bool wxGenericScrolledWindow::Layout()
+{
+ if (GetSizer() && m_targetWindow == this)
+ {
+ // If we're the scroll target, take into account the
+ // virtual size and scrolled position of the window.
+
+ int x, y, w, h;
+ CalcScrolledPosition(0,0, &x,&y);
+ GetVirtualSize(&w, &h);
+ GetSizer()->SetDimension(x, y, w, h);
+ return TRUE;
+ }
+
+ // fall back to default for LayoutConstraints
+ return wxPanel::Layout();
+}
+
+void wxGenericScrolledWindow::DoSetVirtualSize(int x, int y)
+{
+ wxPanel::DoSetVirtualSize( x, y );
+ AdjustScrollbars();
+
+#if wxUSE_CONSTRAINTS
+ if (GetAutoLayout())
+ Layout();
+#endif
+}
+
void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
{
// the user code didn't really draw the window if we got here, so set this
event.Skip();
}
+#ifdef __WXMSW__
+long
+wxGenericScrolledWindow::MSWWindowProc(WXUINT nMsg,
+ WXWPARAM wParam,
+ WXLPARAM lParam)
+{
+ long rc = wxPanel::MSWWindowProc(nMsg, wParam, lParam);
+
+ // we need to process arrows ourselves for scrolling
+ if ( nMsg == WM_GETDLGCODE )
+ {
+ rc |= DLGC_WANTARROWS;
+ }
+
+ return rc;
+}
+
+#endif // __WXMSW__
+
#if WXWIN_COMPATIBILITY
void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
#endif // !wxGTK
+// vi:sts=4:sw=4:et
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