X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/605d715ddd84ddc3e78423e3f3ae5c27c8ff4d43..cd72551c2b6cbf67a4a5caf0ba00ba64e41183b2:/docs/latex/wx/evthand.tex?ds=sidebyside diff --git a/docs/latex/wx/evthand.tex b/docs/latex/wx/evthand.tex index 79bec64648..3b543f1a72 100644 --- a/docs/latex/wx/evthand.tex +++ b/docs/latex/wx/evthand.tex @@ -36,9 +36,7 @@ each other. \func{virtual void}{AddPendingEvent}{\param{wxEvent\& }{event}} -Adds an event to be processed later. The function will return immediately and the -event will get processed in idle time using the \helpref{wxEvtHandler::ProcessEvent}{wxevthandlerprocessevent} -method. +This function posts an event to be processed later. \wxheading{Parameters} @@ -46,24 +44,27 @@ method. \wxheading{Remarks} -Note that this requires that the event has a fully implemented Clone() -method so that the event can be duplicated and stored until it gets processed later. -Not all events in wxWindows currently have a fully implemented Clone() method, -so you may have to look at the source to verify this. - -This methods automatically wakes up idle handling even if the underlying window -system is currently idle anyway and thus would not send any idle events. (Waking -up the idle handling is done calling \helpref{::wxWakeUpIdle}{wxwakeupidle}.) - -This is also the method to call for inter-thread communication. In -a multi-threaded program, you will often have to inform the main GUI thread -about the status of other working threads and this has to be done using this -method - which also means that this method is thread safe by means of using -crtical sections where needed. - -Furthermore, it may be noted that some ports of wxWindows will probably move -to using this method more and more in preference over calling ProcessEvent() -directly so as to avoid problems with reentrant code. +The difference between sending an event (using the +\helpref{ProcessEvent}{wxevthandlerprocessevent} method) and posting it is +that in the first case the event is processed before the function returns, +while in the second case, the function returns immediately and the event will +be processed sometime later (usually during the next event loop iteration). + +A copy of {\it event} is made by the function, so the original can be deleted +as soon as function returns (it is common that the original is created on the +stack). This requires that the \helpref{wxEvent::Clone}{wxeventclone} method +be implemented by {\it event} so that it can be duplicated and stored until +it gets processed. + +This is also the method to call for inter-thread communication---it will +post events safely between different threads which means that this method is +thread-safe by using critical sections where needed. In a multi-threaded +program, you often need to inform the main GUI thread about the status of +other working threads and such notification should be done using this method. + +This method automatically wakes up idle handling if the underlying window +system is currently idle and thus would not send any idle events. (Waking +up idle handling is done calling \helpref{::wxWakeUpIdle}{wxwakeupidle}.) \membersection{wxEvtHandler::Connect}\label{wxevthandlerconnect}