include/wx/msw/evtloop.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/msw/evtloop.h
   3 // Purpose:     wxEventLoop class for MSW
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     2004-07-31
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003-2004 Vadim Zeitlin <vadim@wxwindows.org>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MSW_EVTLOOP_H_
  13 #define _WX_MSW_EVTLOOP_H_
  14
  15 #include "wx/window.h"
  16
  17 // ----------------------------------------------------------------------------
  18 // wxEventLoop
  19 // ----------------------------------------------------------------------------
  20
  21 class WXDLLEXPORT wxEventLoop : public wxEventLoopManual
  22 {
  23 public:
  24     wxEventLoop();
  25
  26     // implement base class pure virtuals
  27     virtual bool Pending() const;
  28     virtual bool Dispatch();
  29
  30     // MSW-specific methods
  31     // --------------------
  32
  33     // preprocess a message, return true if processed (i.e. no further
  34     // dispatching required)
  35     virtual bool PreProcessMessage(WXMSG *msg);
  36
  37     // process a single message
  38     virtual void ProcessMessage(WXMSG *msg);
  39
  40     // set the critical window: this is the window such that all the events
  41     // except those to this window (and its children) stop to be processed
  42     // (typical examples: assert or crash report dialog)
  43     //
  44     // calling this function with NULL argument restores the normal event
  45     // handling
  46     static void SetCriticalWindow(wxWindowMSW *win) { ms_winCritical = win; }
  47
  48     // return true if there is no critical window or if this window is [a child
  49     // of] the critical one
  50     static bool AllowProcessing(wxWindowMSW *win)
  51     {
  52         return !ms_winCritical || IsChildOfCriticalWindow(win);
  53     }
  54
  55 protected:
  56     // override/implement base class virtuals
  57     virtual void WakeUp();
  58     virtual void OnNextIteration();
  59
  60     // check if the given window is a child of ms_winCritical (which must be
  61     // non NULL)
  62     static bool IsChildOfCriticalWindow(wxWindowMSW *win);
  63
  64
  65     // critical window or NULL
  66     static wxWindowMSW *ms_winCritical;
  67 };
  68
  69 #endif // _WX_MSW_EVTLOOP_H_