/////////////////////////////////////////////////////////////////////////////
-// Name: generic/scrolwin.cpp
-// Purpose: wxGenericScrolledWindow implementation
+// Name: src/generic/scrlwing.cpp
+// Purpose: wxScrolledWindow 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
+// Copyright: (c) wxWidgets team
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// headers
// ----------------------------------------------------------------------------
-#ifdef __GNUG__
- #pragma implementation "genscrolwin.h"
-#endif
-
#ifdef __VMS
#define XtDisplay XTDISPLAY
#endif
#pragma hdrstop
#endif
-#if !defined(__WXGTK__) || defined(__WXUNIVERSAL__)
+#include "wx/scrolwin.h"
-#include "wx/utils.h"
-#include "wx/dcclient.h"
+#ifndef WX_PRECOMP
+ #include "wx/utils.h"
+ #include "wx/panel.h"
+ #include "wx/dcclient.h"
+ #if wxUSE_TIMER
+ #include "wx/timer.h"
+ #endif
+ #include "wx/sizer.h"
+#endif
-#include "wx/scrolwin.h"
-#include "wx/panel.h"
-#include "wx/timer.h"
+#ifdef __WXMAC__
+#include "wx/scrolbar.h"
+#endif
+
+#include "wx/recguard.h"
#ifdef __WXMSW__
#include <windows.h> // for DLGC_WANTARROWS
+ #include "wx/msw/winundef.h"
#endif
#ifdef __WXMOTIF__
#endif
#endif
-IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
+/*
+ TODO PROPERTIES
+ style wxHSCROLL | wxVSCROLL
+*/
// ----------------------------------------------------------------------------
// wxScrollHelperEvtHandler: intercept the events from the window and forward
// them to wxScrollHelper
// ----------------------------------------------------------------------------
-class wxScrollHelperEvtHandler : public wxEvtHandler
+class WXDLLEXPORT wxScrollHelperEvtHandler : public wxEvtHandler
{
public:
wxScrollHelperEvtHandler(wxScrollHelper *scrollHelper)
virtual bool ProcessEvent(wxEvent& event);
+ void ResetDrawnFlag() { m_hasDrawnWindow = false; }
+
private:
wxScrollHelper *m_scrollHelper;
+
+ bool m_hasDrawnWindow;
+
+ DECLARE_NO_COPY_CLASS(wxScrollHelperEvtHandler)
};
+#if wxUSE_TIMER
// ----------------------------------------------------------------------------
// wxAutoScrollTimer: the timer used to generate a stream of scroll events when
// a captured mouse is held outside the window
wxEventType m_eventType;
int m_pos,
m_orient;
+
+ DECLARE_NO_COPY_CLASS(wxAutoScrollTimer)
};
// ============================================================================
}
}
}
+#endif
// ----------------------------------------------------------------------------
// wxScrollHelperEvtHandler
bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
{
- if ( wxEvtHandler::ProcessEvent(event) )
- return TRUE;
+ wxEventType evType = event.GetEventType();
- // reset the skipped flag to FALSE as it might have been set to TRUE in
- // ProcessEvent() above
- event.Skip(FALSE);
+ // 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
+ //
+ // 1. override wxScrolledWindow::OnDraw(dc)
+ // 2. define its own OnPaint() handler
+ //
+ // In addition, in wxUniversal wxWindow defines OnPaint() itself and
+ // always processes the draw event, so we can't just try the window
+ // OnPaint() first and call our HandleOnPaint() if it doesn't process it
+ // (the latter would never be called in wxUniversal).
+ //
+ // So the solution is to have a flag telling us whether the user code drew
+ // anything in the window. We set it to true here but reset it to false in
+ // wxScrolledWindow::OnPaint() handler (which wouldn't be called if the
+ // user code defined OnPaint() in the derived class)
+ m_hasDrawnWindow = true;
+
+ // 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);
- wxEventType evType = event.GetEventType();
+ 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
+ // OnDraw() below (from HandleOnPaint)
+ if ( m_hasDrawnWindow || event.IsCommandEvent() )
+ {
+ return true;
+ }
+ }
if ( evType == wxEVT_PAINT )
{
m_scrollHelper->HandleOnPaint((wxPaintEvent &)event);
- return TRUE;
+ return true;
}
+ // reset the skipped flag (which might have been set to true in
+ // ProcessEvent() above) to be able to test it below
+ bool wasSkipped = event.GetSkipped();
+ if ( wasSkipped )
+ event.Skip(false);
+
if ( evType == wxEVT_SCROLLWIN_TOP ||
evType == wxEVT_SCROLLWIN_BOTTOM ||
evType == wxEVT_SCROLLWIN_LINEUP ||
evType == wxEVT_SCROLLWIN_THUMBTRACK ||
evType == wxEVT_SCROLLWIN_THUMBRELEASE )
{
- m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
- return !event.GetSkipped();
+ m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
+ if ( !event.GetSkipped() )
+ {
+ // it makes sense to indicate that we processed the message as we
+ // did scroll the window (and also notice that wxAutoScrollTimer
+ // relies on our return value to stop scrolling when we are at top
+ // or bottom already)
+ processed = true;
+ wasSkipped = false;
+ }
}
if ( evType == wxEVT_ENTER_WINDOW )
m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
}
#endif // wxUSE_MOUSEWHEEL
- else if ( evType == wxEVT_SIZE )
- {
- m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
- }
else if ( evType == wxEVT_CHAR )
{
m_scrollHelper->HandleOnChar((wxKeyEvent &)event);
- return !event.GetSkipped();
+ if ( !event.GetSkipped() )
+ {
+ processed = true;
+ wasSkipped = false;
+ }
}
- return FALSE;
+ if ( processed )
+ event.Skip(wasSkipped);
+
+ return processed;
}
// ----------------------------------------------------------------------------
wxScrollHelper::wxScrollHelper(wxWindow *win)
{
+ wxASSERT_MSG( win, _T("associated window can't be NULL in wxScrollHelper") );
+
m_xScrollPixelsPerLine =
m_yScrollPixelsPerLine =
m_xScrollPosition =
m_yScrollLinesPerPage = 0;
m_xScrollingEnabled =
- m_yScrollingEnabled = TRUE;
+ m_yScrollingEnabled = true;
m_scaleX =
m_scaleY = 1.0;
m_timerAutoScroll = (wxTimer *)NULL;
- if ( win )
- SetWindow(win);
-}
+ m_handler = NULL;
-void wxScrollHelper::SetWindow(wxWindow *win)
-{
- wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
-
- m_targetWindow = m_win = win;
+ m_win = win;
+
+ m_win->SetScrollHelper( this );
- // install the event handler which will intercept the events we're
- // interested in
- m_win->PushEventHandler(new wxScrollHelperEvtHandler(this));
+ // by default, the associated window is also the target window
+ DoSetTargetWindow(win);
}
wxScrollHelper::~wxScrollHelper()
{
StopAutoScrolling();
- if ( m_targetWindow )
- m_targetWindow->PopEventHandler(TRUE /* do delete it */);
+ DeleteEvtHandler();
}
// ----------------------------------------------------------------------------
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.
+ int w = noUnitsX * pixelsPerUnitX;
+ int h = noUnitsY * pixelsPerUnitY;
- if ( m_targetWindow->GetWindowStyle() & wxRETAINED )
+ // For better backward compatibility we set persisting limits
+ // here not just the size. It makes SetScrollbars 'sticky'
+ // emulating the old non-autoscroll behaviour.
+ // m_targetWindow->SetVirtualSizeHints( w, h );
+
+ // The above should arguably be deprecated, this however we still need.
+
+ // take care not to set 0 virtual size, 0 means that we don't have any
+ // scrollbars and hence we should use the real size instead of the virtual
+ // one which is indicated by using wxDefaultCoord
+ m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
+ h ? h : wxDefaultCoord);
+
+ if (do_refresh && !noRefresh)
+ m_targetWindow->Refresh(true, GetScrollRect());
+
+#ifndef __WXUNIVERSAL__
+ // If the target is not the same as the window with the scrollbars,
+ // then we need to update the scrollbars here, since they won't have
+ // been updated by SetVirtualSize().
+ if ( m_targetWindow != m_win )
+#endif // !__WXUNIVERSAL__
{
- Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
+ AdjustScrollbars();
+ }
+#ifndef __WXUNIVERSAL__
+ else
+ {
+ // otherwise this has been done by AdjustScrollbars, above
+ }
+#endif // !__WXUNIVERSAL__
+}
- int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
- int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
- if (m_targetWindow->m_backingPixmap &&
- !((m_targetWindow->m_pixmapWidth == totalPixelWidth) &&
- (m_targetWindow->m_pixmapHeight == totalPixelHeight)))
- {
- XFreePixmap (dpy, (Pixmap) m_targetWindow->m_backingPixmap);
- m_targetWindow->m_backingPixmap = (WXPixmap) 0;
- }
+// ----------------------------------------------------------------------------
+// [target] window handling
+// ----------------------------------------------------------------------------
- if (!m_targetWindow->m_backingPixmap &&
- (noUnitsX != 0) && (noUnitsY != 0))
+void wxScrollHelper::DeleteEvtHandler()
+{
+ // search for m_handler in the handler list
+ if ( m_win && m_handler )
+ {
+ if ( m_win->RemoveEventHandler(m_handler) )
{
- int depth = wxDisplayDepth();
- m_pixmapWidth = totalPixelWidth;
- m_pixmapHeight = totalPixelHeight;
- m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
- m_pixmapWidth, m_pixmapHeight, depth);
+ delete m_handler;
}
+ //else: something is very wrong, so better [maybe] leak memory than
+ // risk a crash because of double deletion
+ m_handler = NULL;
}
-#endif // Motif
-
- AdjustScrollbars();
-
- if (do_refresh && !noRefresh)
- m_targetWindow->Refresh(TRUE, GetRect());
+}
+void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
+{
+ m_targetWindow = target;
#ifdef __WXMAC__
- m_targetWindow->MacUpdateImmediately() ;
+ target->MacSetClipChildren( true ) ;
#endif
-}
-// ----------------------------------------------------------------------------
-// target window handling
-// ----------------------------------------------------------------------------
+ // install the event handler which will intercept the events we're
+ // 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)
{
- wxASSERT_MSG( target, wxT("target window must not be NULL") );
- m_targetWindow = target;
+ wxCHECK_RET( target, wxT("target window must not be NULL") );
+
+ if ( target == m_targetWindow )
+ return;
+
+ DoSetTargetWindow(target);
}
wxWindow *wxScrollHelper::GetTargetWindow() const
return m_targetWindow;
}
+#ifdef __WXMAC__
+static bool wxScrolledWindowHasChildren(wxWindow* win)
+{
+ wxWindowList::compatibility_iterator node = win->GetChildren().GetFirst();
+ while ( node )
+ {
+ wxWindow* child = node->GetData();
+ if ( !child->IsKindOf(CLASSINFO(wxScrollBar)) )
+ return true;
+
+ node = node->GetNext();
+ }
+ return false;
+}
+#endif
+
// ----------------------------------------------------------------------------
// scrolling implementation itself
// ----------------------------------------------------------------------------
return;
}
- int orient = event.GetOrientation();
- if (orient == wxHORIZONTAL)
- {
- m_xScrollPosition += nScrollInc;
- m_targetWindow->SetScrollPos(wxHORIZONTAL, m_xScrollPosition, FALSE);
- }
- else
- {
- m_yScrollPosition += nScrollInc;
- m_targetWindow->SetScrollPos(wxVERTICAL, m_yScrollPosition, FALSE);
- }
-
- bool needsRefresh = FALSE;
+ bool needsRefresh = false;
+#ifdef __WXMAC__
+ // OS X blocks on immediate redraws, so make this a refresh
+ if (!wxScrolledWindowHasChildren(m_targetWindow))
+ needsRefresh = true;
+#endif
int dx = 0,
dy = 0;
+ int orient = event.GetOrientation();
if (orient == wxHORIZONTAL)
{
if ( m_xScrollingEnabled )
}
else
{
- needsRefresh = TRUE;
+ needsRefresh = true;
}
}
else
}
else
{
- needsRefresh = TRUE;
+ needsRefresh = true;
}
}
- if ( needsRefresh )
+ if ( !needsRefresh )
{
- m_targetWindow->Refresh(TRUE, GetRect());
+ // flush all pending repaints before we change m_{x,y}ScrollPosition, as
+ // otherwise invalidated area could be updated incorrectly later when
+ // ScrollWindow() makes sure they're repainted before scrolling them
+ m_targetWindow->Update();
+ }
+
+ if (orient == wxHORIZONTAL)
+ {
+ m_xScrollPosition += nScrollInc;
+ m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
}
else
{
- m_targetWindow->ScrollWindow(dx, dy, GetRect());
+ m_yScrollPosition += nScrollInc;
+ m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
}
-#ifdef __WXMAC__
- m_targetWindow->MacUpdateImmediately() ;
-#endif
+ if ( needsRefresh )
+ {
+ m_targetWindow->Refresh(true, GetScrollRect());
+ }
+ else
+ {
+ m_targetWindow->ScrollWindow(dx, dy, GetScrollRect());
+ }
}
int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
{
if (m_xScrollPixelsPerLine > 0)
{
- int w, h;
- GetTargetSize(&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
+ if ( m_xScrollPosition + nScrollInc < 0 )
+ {
+ // As -ve as we can go
+ nScrollInc = -m_xScrollPosition;
+ }
+ else // check for the other bound
+ {
+ const int posMax = m_xScrollLines - m_xScrollLinesPerPage;
+ if ( m_xScrollPosition + nScrollInc > posMax )
+ {
+ // As +ve as we can go
+ nScrollInc = posMax - m_xScrollPosition;
+ }
+ }
}
else
- m_targetWindow->Refresh(TRUE, GetRect());
+ m_targetWindow->Refresh(true, GetScrollRect());
}
else
{
- if (m_yScrollPixelsPerLine > 0)
+ if ( m_yScrollPixelsPerLine > 0 )
{
- int w, h;
- GetTargetSize(&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
+ if ( m_yScrollPosition + nScrollInc < 0 )
+ {
+ // As -ve as we can go
+ nScrollInc = -m_yScrollPosition;
+ }
+ else // check for the other bound
+ {
+ const int posMax = m_yScrollLines - m_yScrollLinesPerPage;
+ if ( m_yScrollPosition + nScrollInc > posMax )
+ {
+ // As +ve as we can go
+ nScrollInc = posMax - m_yScrollPosition;
+ }
+ }
}
else
- m_targetWindow->Refresh(TRUE, GetRect());
+ {
+ // VZ: why do we do this? (FIXME)
+ m_targetWindow->Refresh(true, GetScrollRect());
+ }
}
return nScrollInc;
// Adjust the scrollbars - new version.
void wxScrollHelper::AdjustScrollbars()
{
-#ifdef __WXMAC__
- m_targetWindow->MacUpdateImmediately();
-#endif
+ static wxRecursionGuardFlag s_flagReentrancy;
+ wxRecursionGuard guard(s_flagReentrancy);
+ if ( guard.IsInside() )
+ {
+ // don't reenter AdjustScrollbars() while another call to
+ // AdjustScrollbars() is in progress because this may lead to calling
+ // ScrollWindow() twice and this can really happen under MSW if
+ // SetScrollbar() call below adds or removes the scrollbar which
+ // changes the window size and hence results in another
+ // AdjustScrollbars() call
+ return;
+ }
- 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)
+ // VZ: at least under Windows this loop is useless because when scrollbars
+ // [dis]appear we get a WM_SIZE resulting in another call to
+ // AdjustScrollbars() anyhow. As it doesn't seem to do any harm I leave
+ // it here for now but it would be better to ensure that all ports
+ // generate EVT_SIZE when scrollbars [dis]appear, emulating it if
+ // necessary, and remove it later
+ // JACS: Stop potential infinite loop by limiting number of iterations
+ int iterationCount = 0;
+ const int iterationMax = 5;
+ do
{
- // 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;
+ iterationCount ++;
- // 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 );
+ GetTargetSize(&w, 0);
+
+ // scroll lines per page: if 0, no scrolling is needed
+ int linesPerPage;
+
+ if ( m_xScrollPixelsPerLine == 0 )
+ {
+ // scrolling is disabled
+ m_xScrollLines = 0;
+ m_xScrollPosition = 0;
+ linesPerPage = 0;
+ }
+ else // might need scrolling
+ {
+ // Round up integer division to catch any "leftover" client space.
+ const int wVirt = m_targetWindow->GetVirtualSize().GetWidth();
+ m_xScrollLines = (wVirt + m_xScrollPixelsPerLine - 1) / m_xScrollPixelsPerLine;
+
+ // Calculate page size i.e. number of scroll units you get on the
+ // current client window.
+ linesPerPage = w / m_xScrollPixelsPerLine;
+
+ // Special case. When client and virtual size are very close but
+ // the client is big enough, kill scrollbar.
+ if ((linesPerPage < m_xScrollLines) && (w >= wVirt)) ++linesPerPage;
+
+ if (linesPerPage >= m_xScrollLines)
+ {
+ // we're big enough to not need scrolling
+ linesPerPage =
+ m_xScrollLines =
+ m_xScrollPosition = 0;
+ }
+ else // we do need a scrollbar
+ {
+ if ( linesPerPage < 1 )
+ linesPerPage = 1;
+
+ // Correct position if greater than extent of canvas minus
+ // the visible portion of it or if below zero
+ const int posMax = m_xScrollLines - linesPerPage;
+ if ( m_xScrollPosition > posMax )
+ m_xScrollPosition = posMax;
+ else if ( m_xScrollPosition < 0 )
+ m_xScrollPosition = 0;
+ }
+ }
+
+ m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition,
+ linesPerPage, m_xScrollLines);
- 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);
- }
+ SetScrollPageSize(wxHORIZONTAL, linesPerPage);
- 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;
+ GetTargetSize(0, &h);
- // 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 ( m_yScrollPixelsPerLine == 0 )
+ {
+ // scrolling is disabled
+ m_yScrollLines = 0;
+ m_yScrollPosition = 0;
+ linesPerPage = 0;
+ }
+ else // might need scrolling
+ {
+ // Round up integer division to catch any "leftover" client space.
+ const int hVirt = m_targetWindow->GetVirtualSize().GetHeight();
+ m_yScrollLines = ( hVirt + m_yScrollPixelsPerLine - 1 ) / m_yScrollPixelsPerLine;
+
+ // Calculate page size i.e. number of scroll units you get on the
+ // current client window.
+ linesPerPage = h / m_yScrollPixelsPerLine;
+
+ // Special case. When client and virtual size are very close but
+ // the client is big enough, kill scrollbar.
+ if ((linesPerPage < m_yScrollLines) && (h >= hVirt)) ++linesPerPage;
+
+ if (linesPerPage >= m_yScrollLines)
+ {
+ // we're big enough to not need scrolling
+ linesPerPage =
+ m_yScrollLines =
+ m_yScrollPosition = 0;
+ }
+ else // we do need a scrollbar
+ {
+ if ( linesPerPage < 1 )
+ linesPerPage = 1;
+
+ // Correct position if greater than extent of canvas minus
+ // the visible portion of it or if below zero
+ const int posMax = m_yScrollLines - linesPerPage;
+ if ( m_yScrollPosition > posMax )
+ m_yScrollPosition = posMax;
+ else if ( m_yScrollPosition < 0 )
+ m_yScrollPosition = 0;
+ }
+ }
+
+ m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition,
+ linesPerPage, m_yScrollLines);
- m_targetWindow->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
// The amount by which we scroll when paging
- SetScrollPageSize(wxVERTICAL, noPagePositions);
- }
- else
+ SetScrollPageSize(wxVERTICAL, linesPerPage);
+
+
+ // If a scrollbar (dis)appeared as a result of this, adjust them again.
+ oldw = w;
+ oldh = h;
+
+ GetTargetSize( &w, &h );
+ } while ( (w != oldw || h != oldh) && (iterationCount < iterationMax) );
+
+#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,
- GetRect() );
+ m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
+ GetScrollRect() );
else
- m_targetWindow->Refresh(TRUE, GetRect());
+ m_targetWindow->Refresh(true, GetScrollRect());
}
if (oldYScroll != m_yScrollPosition)
{
if (m_yScrollingEnabled)
m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
- GetRect() );
+ GetScrollRect() );
else
- m_targetWindow->Refresh(TRUE, GetRect());
+ m_targetWindow->Refresh(true, GetScrollRect());
}
-
-#ifdef __WXMAC__
- m_targetWindow->MacUpdateImmediately();
-#endif
}
void wxScrollHelper::DoPrepareDC(wxDC& dc)
{
wxPoint pt = dc.GetDeviceOrigin();
- dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
- pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
+#ifdef __WXGTK__
+ // It may actually be correct to always query
+ // the m_sign from the DC here, but I leve the
+ // #ifdef GTK for now.
+ if (m_win->GetLayoutDirection() == wxLayout_RightToLeft)
+ dc.SetDeviceOrigin( pt.x + m_xScrollPosition * m_xScrollPixelsPerLine,
+ pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
+ else
+#endif
+ dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
+ pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
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 )
*y_unit = m_yScrollPixelsPerLine;
}
+
+int wxScrollHelper::GetScrollLines( int orient ) const
+{
+ if ( orient == wxHORIZONTAL )
+ return m_xScrollLines;
+ else
+ return m_yScrollLines;
+}
+
int wxScrollHelper::GetScrollPageSize(int orient) const
{
if ( orient == wxHORIZONTAL )
if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
-#ifdef __WXMAC__
- m_targetWindow->MacUpdateImmediately();
-#endif
-
- int w, h;
+ int w = 0, h = 0;
GetTargetSize(&w, &h);
+ // compute new position:
+ int new_x = m_xScrollPosition;
+ int new_y = m_yScrollPosition;
+
if ((x_pos != -1) && (m_xScrollPixelsPerLine))
{
- int old_x = m_xScrollPosition;
- m_xScrollPosition = x_pos;
+ new_x = 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 );
+ int noPagePositions = w/m_xScrollPixelsPerLine;
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 );
-
- if (old_x != m_xScrollPosition) {
- m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, FALSE );
- m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
- GetRect() );
- }
+ new_x = wxMin( m_xScrollLines-noPagePositions, new_x );
+ new_x = wxMax( 0, new_x );
}
if ((y_pos != -1) && (m_yScrollPixelsPerLine))
{
- int old_y = m_yScrollPosition;
- m_yScrollPosition = y_pos;
+ new_y = 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 );
+ int noPagePositions = h/m_yScrollPixelsPerLine;
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 );
-
- if (old_y != m_yScrollPosition) {
- m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, FALSE );
- m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
- GetRect() );
- }
+ new_y = wxMin( m_yScrollLines-noPagePositions, new_y );
+ new_y = wxMax( 0, new_y );
}
-#ifdef __WXMAC__
- m_targetWindow->MacUpdateImmediately();
-#endif
+ if ( new_x == m_xScrollPosition && new_y == m_yScrollPosition )
+ return; // nothing to do, the position didn't change
+
+ // flush all pending repaints before we change m_{x,y}ScrollPosition, as
+ // otherwise invalidated area could be updated incorrectly later when
+ // ScrollWindow() makes sure they're repainted before scrolling them
+ m_targetWindow->Update();
+
+ // update the position and scroll the window now:
+ if (m_xScrollPosition != new_x)
+ {
+ int old_x = m_xScrollPosition;
+ m_xScrollPosition = new_x;
+ m_win->SetScrollPos( wxHORIZONTAL, new_x );
+ m_targetWindow->ScrollWindow( (old_x-new_x)*m_xScrollPixelsPerLine, 0,
+ GetScrollRect() );
+ }
+ if (m_yScrollPosition != new_y)
+ {
+ int old_y = m_yScrollPosition;
+ m_yScrollPosition = new_y;
+ m_win->SetScrollPos( wxVERTICAL, new_y );
+ m_targetWindow->ScrollWindow( 0, (old_y-new_y)*m_yScrollPixelsPerLine,
+ GetScrollRect() );
+ }
}
void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
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;
*yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
}
+// ----------------------------------------------------------------------------
+// geometry
+// ----------------------------------------------------------------------------
+
+bool wxScrollHelper::ScrollLayout()
+{
+ if ( m_win->GetSizer() && m_targetWindow == m_win )
+ {
+ // If we're the scroll target, take into account the
+ // virtual size and scrolled position of the window.
+
+ int x = 0, y = 0, w = 0, h = 0;
+ CalcScrolledPosition(0,0, &x,&y);
+ m_win->GetVirtualSize(&w, &h);
+ m_win->GetSizer()->SetDimension(x, y, w, h);
+ return true;
+ }
+
+ // fall back to default for LayoutConstraints
+ return m_win->wxWindow::Layout();
+}
+
+void wxScrollHelper::ScrollDoSetVirtualSize(int x, int y)
+{
+ m_win->wxWindow::DoSetVirtualSize( x, y );
+ AdjustScrollbars();
+
+ if (m_win->GetAutoLayout())
+ m_win->Layout();
+}
+
+// wxWindow's GetBestVirtualSize returns the actual window size,
+// whereas we want to return the virtual size
+wxSize wxScrollHelper::ScrollGetBestVirtualSize() const
+{
+ wxSize clientSize(m_win->GetClientSize());
+ if ( m_win->GetSizer() )
+ clientSize.IncTo(m_win->GetSizer()->CalcMin());
+
+ return clientSize;
+}
+
+// return the window best size from the given best virtual size
+wxSize
+wxScrollHelper::ScrollGetWindowSizeForVirtualSize(const wxSize& size) const
+{
+ // Only use the content to set the window size in the direction
+ // where there's no scrolling; otherwise we're going to get a huge
+ // window in the direction in which scrolling is enabled
+ int ppuX, ppuY;
+ GetScrollPixelsPerUnit(&ppuX, &ppuY);
+
+ wxSize minSize = m_win->GetMinSize();
+ if ( !minSize.IsFullySpecified() )
+ minSize = m_win->GetSize();
+
+ wxSize best(size);
+ if (ppuX > 0)
+ best.x = minSize.x;
+ if (ppuY > 0)
+ best.y = minSize.y;
+
+ return best;
+}
+
// ----------------------------------------------------------------------------
// event handlers
// ----------------------------------------------------------------------------
// Default OnSize resets scrollbars, if any
void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
{
-#if wxUSE_CONSTRAINTS
if ( m_targetWindow->GetAutoLayout() )
- m_targetWindow->Layout();
-#endif
+ {
+ wxSize size = m_targetWindow->GetBestVirtualSize();
- AdjustScrollbars();
+ // This will call ::Layout() and ::AdjustScrollbars()
+ m_win->SetVirtualSize( size );
+ }
+ 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);
// this they always have the priority
void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
{
- int stx, sty, // view origin
- szx, szy, // view size (total)
- clix, cliy; // view size (on screen)
+ int stx = 0, sty = 0, // view origin
+ szx = 0, szy = 0, // view size (total)
+ clix = 0, cliy = 0; // view size (on screen)
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:
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;
void wxScrollHelper::StopAutoScrolling()
{
+#if wxUSE_TIMER
if ( m_timerAutoScroll )
{
delete m_timerAutoScroll;
m_timerAutoScroll = (wxTimer *)NULL;
}
+#endif
}
void wxScrollHelper::HandleOnMouseEnter(wxMouseEvent& event)
if ( !m_targetWindow->HasScrollbar(orient) )
return;
+#if wxUSE_TIMER
delete m_timerAutoScroll;
m_timerAutoScroll = new wxAutoScrollTimer
(
orient
);
m_timerAutoScroll->Start(50); // FIXME: make configurable
+#else
+ wxUnusedVar(pos);
+#endif
}
}
if (lines != 0)
{
- lines *= event.GetLinesPerAction();
- int vsx, vsy;
- GetViewStart(&vsx, &vsy);
- Scroll(-1, vsy - lines);
+ wxScrollWinEvent newEvent;
+
+ newEvent.SetPosition(0);
+ newEvent.SetOrientation( event.GetWheelAxis() == 0 ? wxVERTICAL : wxHORIZONTAL);
+ newEvent.SetEventObject(m_win);
+
+ if (event.IsPageScroll())
+ {
+ if (lines > 0)
+ newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEUP);
+ else
+ newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEDOWN);
+
+ m_win->GetEventHandler()->ProcessEvent(newEvent);
+ }
+ else
+ {
+ lines *= event.GetLinesPerAction();
+ if (lines > 0)
+ newEvent.SetEventType(wxEVT_SCROLLWIN_LINEUP);
+ else
+ newEvent.SetEventType(wxEVT_SCROLLWIN_LINEDOWN);
+
+ int times = abs(lines);
+ for (; times > 0; times--)
+ m_win->GetEventHandler()->ProcessEvent(newEvent);
+ }
}
}
#endif // wxUSE_MOUSEWHEEL
// ----------------------------------------------------------------------------
-// wxGenericScrolledWindow implementation
+// wxScrolledWindow implementation
// ----------------------------------------------------------------------------
-IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
+IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
-bool wxGenericScrolledWindow::Create(wxWindow *parent,
+BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
+ EVT_PAINT(wxScrolledWindow::OnPaint)
+END_EVENT_TABLE()
+
+bool wxScrolledWindow::Create(wxWindow *parent,
wxWindowID id,
const wxPoint& pos,
const wxSize& size,
const wxString& name)
{
m_targetWindow = this;
+#ifdef __WXMAC__
+ MacSetClipChildren( true ) ;
+#endif
- bool ok = wxPanel::Create(parent, id, pos, size, style, name);
+ // by default, we're scrollable in both directions (but if one of the
+ // styles is specified explicitly, we shouldn't add the other one
+ // automatically)
+ if ( !(style & (wxHSCROLL | wxVSCROLL)) )
+ style |= wxHSCROLL | wxVSCROLL;
-#ifdef __WXMSW__
- // we need to process arrows ourselves for scrolling
- m_lDlgCode |= DLGC_WANTARROWS;
-#endif // __WXMSW__
+ bool ok = wxPanel::Create(parent, id, pos, size, style, name);
return ok;
}
-wxGenericScrolledWindow::~wxGenericScrolledWindow()
+wxScrolledWindow::~wxScrolledWindow()
{
}
-#if WXWIN_COMPATIBILITY
-void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
+void wxScrolledWindow::OnPaint(wxPaintEvent& event)
{
- *x_page = GetScrollPageSize(wxHORIZONTAL);
- *y_page = GetScrollPageSize(wxVERTICAL);
+ // the user code didn't really draw the window if we got here, so set this
+ // flag to try to call OnDraw() later
+ m_handler->ResetDrawnFlag();
+
+ event.Skip();
}
-void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
+#ifdef __WXMSW__
+WXLRESULT wxScrolledWindow::MSWWindowProc(WXUINT nMsg,
+ WXWPARAM wParam,
+ WXLPARAM lParam)
{
- if ( xx )
- *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
- if ( yy )
- *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
-}
-#endif // WXWIN_COMPATIBILITY
+ WXLRESULT rc = wxPanel::MSWWindowProc(nMsg, wParam, lParam);
-#endif // !wxGTK
+#ifndef __WXWINCE__
+ // we need to process arrows ourselves for scrolling
+ if ( nMsg == WM_GETDLGCODE )
+ {
+ rc |= DLGC_WANTARROWS;
+ }
+#endif
+
+ return rc;
+}
+#endif // __WXMSW__
projects / wxWidgets.git / blobdiff