src/dfb/evtloop.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/evtloop.cpp
   3 // Purpose:     wxEventLoop implementation
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-08-16
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2006 REA Elektronik GmbH
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ===========================================================================
  12 // declarations
  13 // ===========================================================================
  14
  15 // ---------------------------------------------------------------------------
  16 // headers
  17 // ---------------------------------------------------------------------------
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #include "wx/evtloop.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/app.h"
  26 #endif
  27
  28 #include "wx/timer.h"
  29 #include "wx/dfb/private.h"
  30
  31 #define TRACE_EVENTS _T("events")
  32
  33 // ===========================================================================
  34 // implementation
  35 // ===========================================================================
  36
  37 //-----------------------------------------------------------------------------
  38 // wxEventLoop initialization
  39 //-----------------------------------------------------------------------------
  40
  41 wxIDirectFBEventBufferPtr wxEventLoop::ms_buffer;
  42
  43 wxEventLoop::wxEventLoop()
  44 {
  45     if ( !ms_buffer )
  46         InitBuffer();
  47 }
  48
  49 /* static */
  50 void wxEventLoop::InitBuffer()
  51 {
  52     ms_buffer = wxIDirectFB::Get()->CreateEventBuffer();
  53 }
  54
  55 /* static */
  56 wxIDirectFBEventBufferPtr wxEventLoop::GetDirectFBEventBuffer()
  57 {
  58     if ( !ms_buffer )
  59         InitBuffer();
  60
  61     return ms_buffer;
  62 }
  63
  64 //-----------------------------------------------------------------------------
  65 // events dispatch and loop handling
  66 //-----------------------------------------------------------------------------
  67
  68 bool wxEventLoop::Pending() const
  69 {
  70     wxCHECK_MSG( ms_buffer, false, _T("invalid event buffer") );
  71
  72     return ms_buffer->HasEvent();
  73 }
  74
  75 bool wxEventLoop::Dispatch()
  76 {
  77     wxCHECK_MSG( ms_buffer, false, _T("invalid event buffer") );
  78
  79     // NB: we don't block indefinitely waiting for an event, but instead
  80     //     time out after a brief period in order to make sure that
  81     //     OnNextIteration() will be called frequently enough
  82     //
  83     //     FIXME: call NotifyTimers() from here (and loop) instead?
  84     const int TIMEOUT = 100;
  85
  86     if ( ms_buffer->WaitForEventWithTimeout(0, TIMEOUT) )
  87     {
  88         switch ( ms_buffer->GetLastResult() )
  89         {
  90             case DFB_OK:
  91             {
  92                 wxDFBEvent e;
  93                 ms_buffer->GetEvent(e);
  94                 HandleDFBEvent(e);
  95                 break;
  96             }
  97
  98             case DFB_TIMEOUT:
  99                 // timed out, pretend we processed an event so that
 100                 // OnNextIteration is called
 101                 break;
 102
 103             default:
 104                 // don't terminate the loop due to errors (they were reported
 105                 // already by ms_buffer)
 106                 break;
 107         }
 108     }
 109
 110     return true;
 111 }
 112
 113 void wxEventLoop::WakeUp()
 114 {
 115     wxCHECK_RET( ms_buffer, _T("invalid event buffer") );
 116
 117     ms_buffer->WakeUp();
 118 }
 119
 120 void wxEventLoop::OnNextIteration()
 121 {
 122 #if wxUSE_TIMER
 123     // see the comment in Dispatch
 124     wxTimer::NotifyTimers();
 125 #endif
 126 }
 127
 128 #warning "FIXME: cleanup wxEventLoop::ms_buffer before exiting"
 129
 130
 131 //-----------------------------------------------------------------------------
 132 // DirectFB -> wxWidgets events translation
 133 //-----------------------------------------------------------------------------
 134
 135 void wxEventLoop::HandleDFBEvent(const wxDFBEvent& event)
 136 {
 137     switch ( event.GetClass() )
 138     {
 139         case DFEC_WINDOW:
 140         {
 141             wxDFBWindowEvent winevent(((const DFBEvent&)event).window);
 142             wxTopLevelWindowDFB::HandleDFBWindowEvent(winevent);
 143             break;
 144         }
 145
 146         case DFEC_NONE:
 147         case DFEC_INPUT:
 148         case DFEC_USER:
 149 #if wxCHECK_DFB_VERSION(0,9,23)
 150         case DFEC_UNIVERSAL:
 151 #endif
 152         {
 153             wxLogTrace(TRACE_EVENTS,
 154                        _T("ignoring event of unsupported class %i"),
 155                        (int)event.GetClass());
 156         }
 157     }
 158 }