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 IDirectFBEventBufferPtr wxEventLoop::ms_buffer;
  42
  43 wxEventLoop::wxEventLoop()
  44 {
  45     if ( !ms_buffer )
  46         InitBuffer();
  47 }
  48
  49 /* static */
  50 void wxEventLoop::InitBuffer()
  51 {
  52     IDirectFBPtr dfb(wxTheApp->GetDirectFBInterface());
  53     DFB_CALL( dfb->CreateEventBuffer(dfb, &ms_buffer) );
  54 }
  55
  56 /* static */
  57 IDirectFBEventBufferPtr wxEventLoop::GetDirectFBEventBuffer()
  58 {
  59     if ( !ms_buffer )
  60         InitBuffer();
  61
  62     return ms_buffer;
  63 }
  64
  65 //-----------------------------------------------------------------------------
  66 // events dispatch and loop handling
  67 //-----------------------------------------------------------------------------
  68
  69 bool wxEventLoop::Pending() const
  70 {
  71     wxCHECK_MSG( ms_buffer, false, _T("invalid event buffer") );
  72
  73     // returns DFB_OK if there is >=1 event, DFB_BUFFER_EMPTY otherwise
  74     return ms_buffer->HasEvent(ms_buffer) == DFB_OK;
  75 }
  76
  77 bool wxEventLoop::Dispatch()
  78 {
  79     wxCHECK_MSG( ms_buffer, false, _T("invalid event buffer") );
  80
  81     // NB: we don't block indefinitely waiting for an event, but instead
  82     //     time out after a brief period in order to make sure that
  83     //     OnNextIteration() will be called frequently enough
  84     //
  85     //     FIXME: call NotifyTimers() from here (and loop) instead?
  86     const int TIMEOUT = 100;
  87
  88     DFBResult ret = ms_buffer->WaitForEventWithTimeout(ms_buffer, 0, TIMEOUT);
  89
  90     switch ( ret )
  91     {
  92         case DFB_OK:
  93         {
  94             wxDFBEvent e;
  95             ms_buffer->GetEvent(ms_buffer, &e);
  96             HandleDFBEvent(e);
  97             break;
  98         }
  99
 100         case DFB_TIMEOUT:
 101             // timed out, pretend we processed an event so that OnNextIteration
 102             // is called
 103             break;
 104
 105         default:
 106             // report any errors, but don't terminate the loop due to them
 107             wxDfbCheckReturn(ret);
 108             break;
 109     }
 110
 111     return true;
 112 }
 113
 114 void wxEventLoop::WakeUp()
 115 {
 116     wxCHECK_RET( ms_buffer, _T("invalid event buffer") );
 117
 118     DFB_CALL( ms_buffer->WakeUp(ms_buffer) );
 119 }
 120
 121 void wxEventLoop::OnNextIteration()
 122 {
 123 #if wxUSE_TIMER
 124     // see the comment in Dispatch
 125     wxTimer::NotifyTimers();
 126 #endif
 127 }
 128
 129 #warning "FIXME: cleanup wxEventLoop::ms_buffer before exiting"
 130
 131
 132 //-----------------------------------------------------------------------------
 133 // DirectFB -> wxWidgets events translation
 134 //-----------------------------------------------------------------------------
 135
 136 void wxEventLoop::HandleDFBEvent(const wxDFBEvent& event)
 137 {
 138     switch ( event.GetClass() )
 139     {
 140         case DFEC_WINDOW:
 141         {
 142             wxDFBWindowEvent winevent(((const DFBEvent&)event).window);
 143             wxTopLevelWindowDFB::HandleDFBWindowEvent(winevent);
 144             break;
 145         }
 146
 147         case DFEC_NONE:
 148         case DFEC_INPUT:
 149         case DFEC_USER:
 150 #if wxCHECK_DFB_VERSION(0,9,23)
 151         case DFEC_UNIVERSAL:
 152 #endif
 153         {
 154             wxLogTrace(TRACE_EVENTS,
 155                        _T("ignoring event of unsupported class %i"),
 156                        (int)event.GetClass());
 157         }
 158     }
 159 }