a7af285d1a
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47777 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
62 lines
1.8 KiB
TeX
62 lines
1.8 KiB
TeX
\section{\class{wxEraseEvent}}\label{wxeraseevent}
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An erase event is sent when a window's background needs to be repainted.
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On some platforms, such as GTK+, this event is simulated (simply generated just before the
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paint event) and may cause flicker. It is therefore recommended that
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you set the text background colour explicitly in order to prevent flicker.
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The default background colour under GTK+ is grey.
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To intercept this event, use the EVT\_ERASE\_BACKGROUND macro in an event table definition.
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You must call wxEraseEvent::GetDC and use the returned device context if it is non-NULL.
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If it is NULL, create your own temporary wxClientDC object.
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\wxheading{Derived from}
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\helpref{wxEvent}{wxevent}\\
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/event.h>
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\wxheading{Library}
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\helpref{wxCore}{librarieslist}
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\wxheading{Event table macros}
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To process an erase event, use this event handler macro to direct input to a member
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function that takes a wxEraseEvent argument.
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\twocolwidtha{7cm}
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\begin{twocollist}\itemsep=0pt
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\twocolitem{{\bf EVT\_ERASE\_BACKGROUND(func)}}{Process a wxEVT\_ERASE\_BACKGROUND event.}
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\end{twocollist}%
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\wxheading{Remarks}
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Use the device context returned by \helpref{GetDC}{wxeraseeventgetdc} to draw on,
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don't create a wxPaintDC in the event handler.
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\wxheading{See also}
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%\helpref{wxWindow::OnEraseBackground}{wxwindowonerasebackground},
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\helpref{Event handling overview}{eventhandlingoverview}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxEraseEvent::wxEraseEvent}\label{wxeraseeventctor}
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\func{}{wxEraseEvent}{\param{int }{id = 0}, \param{wxDC* }{dc = NULL}}
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Constructor.
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\membersection{wxEraseEvent::GetDC}\label{wxeraseeventgetdc}
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\constfunc{wxDC*}{GetDC}{\void}
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Returns the device context associated with the erase event to draw on.
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