don't always erase the background ourselves as this is incompatible with XP themed...

[wxWidgets.git] / docs / latex / wx / eraseevt.tex

diff --git a/docs/latex/wx/eraseevt.tex b/docs/latex/wx/eraseevt.tex
index a88c15e9e2ecea549866497e3a94f14cbae18c11..46fa06ebca0617b55e2fe8c35d7cc772f2182c68 100644 (file)
--- a/docs/latex/wx/eraseevt.tex
+++ b/docs/latex/wx/eraseevt.tex
@@ -2,6 +2,16 @@
 
 An erase event is sent when a window's background needs to be repainted.
 
+On some platforms, such as GTK+, this event is simulated (simply generated just before the
+paint event) and may cause flicker. It is therefore recommended that
+you set the text background colour explicitly in order to prevent flicker.
+The default background colour under GTK+ is grey.
+
+To intercept this event, use the EVT\_ERASE\_BACKGROUND macro in an event table definition.
+
+You must call wxEraseEvent::GetDC and use the returned device context if it is non-NULL.
+If it is NULL, create your own temporary wxClientDC object. 
+
 \wxheading{Derived from}
 
 \helpref{wxEvent}{wxevent}\\
@@ -23,30 +33,31 @@ function that takes a wxEraseEvent argument.
 
 \wxheading{Remarks}
 
-If the {\bf m\_DC} member is non-NULL, draw into this device context.
+Use the {\bf m\_DC} device context to draw into, don't create wxPaintDC in 
+the event handler.
 
 \wxheading{See also}
 
-\helpref{wxWindow::OnEraseBackground}{wxwindowonerasebackground}, \helpref{Event handling overview}{eventhandlingoverview}
+%\helpref{wxWindow::OnEraseBackground}{wxwindowonerasebackground},
+\helpref{Event handling overview}{eventhandlingoverview}
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
-\membersection{wxEraseEvent::wxEraseEvent}
+\membersection{wxEraseEvent::wxEraseEvent}\label{wxeraseeventctor}
 
 \func{}{wxEraseEvent}{\param{int }{id = 0}, \param{wxDC* }{dc = NULL}}
 
 Constructor.
 
-\membersection{wxEraseEvent::m\_dc}
+\membersection{wxEraseEvent::m\_dc}\label{wxeraseeventmdc}
 
 \member{wxDC*}{m\_dc}
 
-The device context associated with the erase event (may be NULL).
+The device context associated with the erase event.
 
 \membersection{wxEraseEvent::GetDC}\label{wxeraseeventgetdc}
 
 \constfunc{wxDC*}{GetDC}{\void}
 
-Returns the device context to draw into. If this is non-NULL, you should draw
-into it to perform the erase operation.
+Returns the device context to draw into.