73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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// Name: wx/eventfilter.h
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// Purpose: wxEventFilter class declaration.
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// Author: Vadim Zeitlin
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// Created: 2011-11-21
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// RCS-ID: $Id: wxhead.h,v 1.12 2010-04-22 12:44:51 zeitlin Exp $
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// Copyright: (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_EVENTFILTER_H_
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#define _WX_EVENTFILTER_H_
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#include "wx/defs.h"
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class WXDLLIMPEXP_FWD_BASE wxEvent;
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class WXDLLIMPEXP_FWD_BASE wxEvtHandler;
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// ----------------------------------------------------------------------------
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// wxEventFilter is used with wxEvtHandler::AddFilter() and ProcessEvent().
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// ----------------------------------------------------------------------------
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class wxEventFilter
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{
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public:
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// Possible return values for FilterEvent().
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//
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// Notice that the values of these enum elements are fixed due to backwards
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// compatibility constraints.
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enum
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{
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// Process event as usual.
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Event_Skip = -1,
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// Don't process the event normally at all.
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Event_Ignore = 0,
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// Event was already handled, don't process it normally.
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Event_Processed = 1
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};
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wxEventFilter()
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{
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m_next = NULL;
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}
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virtual ~wxEventFilter()
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{
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wxASSERT_MSG( !m_next, "Forgot to call wxEvtHandler::RemoveFilter()?" );
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}
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// This method allows to filter all the events processed by the program, so
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// you should try to return quickly from it to avoid slowing down the
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// program to the crawl.
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//
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// Return value should be -1 to continue with the normal event processing,
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// or true or false to stop further processing and pretend that the event
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// had been already processed or won't be processed at all, respectively.
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virtual int FilterEvent(wxEvent& event) = 0;
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private:
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// Objects of this class are made to be stored in a linked list in
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// wxEvtHandler so put the next node ponter directly in the class itself.
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wxEventFilter* m_next;
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// And provide access to it for wxEvtHandler [only].
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friend class wxEvtHandler;
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wxDECLARE_NO_COPY_CLASS(wxEventFilter);
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};
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#endif // _WX_EVENTFILTER_H_
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