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implemented (untested) work around for wxScrolledWindow painting bug

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11369 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2001-08-13 15:42:29 +00:00
parent 88b792af94
commit 349efbaa89
3 changed files with 104 additions and 29 deletions
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117
src/generic/scrlwing.cpp
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@@ -64,7 +64,7 @@ IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
// them to wxScrollHelper
// ----------------------------------------------------------------------------
class wxScrollHelperEvtHandler : public wxEvtHandler
class WXDLLEXPORT wxScrollHelperEvtHandler : public wxEvtHandler
{
public:
wxScrollHelperEvtHandler(wxScrollHelper *scrollHelper)
@@ -74,8 +74,12 @@ public:
virtual bool ProcessEvent(wxEvent& event);
void ResetDrawnFlag() { m_hasDrawnWindow = FALSE; }
private:
wxScrollHelper *m_scrollHelper;
bool m_hasDrawnWindow;
};
// ----------------------------------------------------------------------------
@@ -169,13 +173,41 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
{
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
//
// 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;
if ( wxEvtHandler::ProcessEvent(event) )
return TRUE;
{
// 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 )
{
return TRUE;
}
}
// reset the skipped flag to FALSE as it might have been set to TRUE in
// ProcessEvent() above
@@ -252,29 +284,17 @@ wxScrollHelper::wxScrollHelper(wxWindow *win)
m_timerAutoScroll = (wxTimer *)NULL;
m_handler = NULL;
if ( win )
SetWindow(win);
}
void wxScrollHelper::SetWindow(wxWindow *win)
{
wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
m_targetWindow = m_win = win;
// install the event handler which will intercept the events we're
// interested in
m_win->PushEventHandler(new wxScrollHelperEvtHandler(this));
}
wxScrollHelper::~wxScrollHelper()
{
StopAutoScrolling();
if ( m_targetWindow )
m_targetWindow->PopEventHandler(TRUE /* do delete it */);
if ( m_win && m_win != m_targetWindow)
m_win->PopEventHandler(TRUE /* do delete it */);
DeleteEvtHandler();
}
// ----------------------------------------------------------------------------
@@ -357,20 +377,44 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
// target window handling
// ----------------------------------------------------------------------------
void wxScrollHelper::DeleteEvtHandler()
{
// FIXME: we should search for m_handler in the handler list
if ( m_targetWindow )
{
m_targetWindow->PopEventHandler(TRUE /* Delete old event handler*/);
}
}
void wxScrollHelper::SetWindow(wxWindow *win)
{
wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
m_win = win;
DoSetTargetWindow(win);
}
void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
{
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);
}
void wxScrollHelper::SetTargetWindow( wxWindow *target )
{
wxASSERT_MSG( target, wxT("target window must not be NULL") );
// FIXME: There is a potential problem with this way of deleting
// event handlers, basically you can not be sure that you delete
// the event handler that was create by this wxScrollHelper.
// Remove the old event handler from the previous target scroll window.
if (m_targetWindow && m_targetWindow != m_win)
m_targetWindow->PopEventHandler(TRUE /* Delete old event handler*/);
m_targetWindow = target;
// Install a new event handler, which will intercept the events we're
// interested in from the target scroll window.
if (m_targetWindow != m_win)
m_targetWindow->PushEventHandler(new wxScrollHelperEvtHandler(this));
wxCHECK_RET( target, wxT("target window must not be NULL") );
if ( target == m_targetWindow )
return;
DeleteEvtHandler();
DoSetTargetWindow(target);
}
wxWindow *wxScrollHelper::GetTargetWindow() const
@@ -1019,6 +1063,10 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
EVT_PAINT(wxGenericScrolledWindow::OnPaint)
END_EVENT_TABLE()
bool wxGenericScrolledWindow::Create(wxWindow *parent,
wxWindowID id,
const wxPoint& pos,
@@ -1042,7 +1090,17 @@ wxGenericScrolledWindow::~wxGenericScrolledWindow()
{
}
void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
{
// 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();
}
#if WXWIN_COMPATIBILITY
void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
{
*x_page = GetScrollPageSize(wxHORIZONTAL);
@@ -1056,6 +1114,7 @@ void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, fl
if ( yy )
*yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
}
#endif // WXWIN_COMPATIBILITY
#endif // !wxGTK