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/thread.h"
  29 #include "wx/private/fdiodispatcher.h"
  30 #include "wx/dfb/private.h"
  31 #include "wx/nonownedwnd.h"
  32 #include "wx/buffer.h"
  33
  34 #include <errno.h>
  35
  36 #define TRACE_EVENTS "events"
  37
  38 // ===========================================================================
  39 // implementation
  40 // ===========================================================================
  41
  42 //-----------------------------------------------------------------------------
  43 // wxDFBEventsHandler
  44 //-----------------------------------------------------------------------------
  45
  46 // This handler is installed to process input on DirectFB's events socket (
  47 // obtained using CreateFileDescriptor()). When IDirectFBEventBuffer is used
  48 // in this mode, events are written to the file descriptor and we read them
  49 // in OnReadWaiting() below.
  50 class wxDFBEventsHandler : public wxFDIOHandler
  51 {
  52 public:
  53     wxDFBEventsHandler()
  54         : m_fd(-1), m_offset(0)
  55     {}
  56
  57     void SetFD(int fd) { m_fd = fd; }
  58
  59     void Reset()
  60     {
  61         m_fd = -1;
  62         m_offset = 0;
  63     }
  64
  65     // implement wxFDIOHandler pure virtual methods
  66     virtual void OnReadWaiting();
  67     virtual void OnWriteWaiting()
  68         { wxFAIL_MSG("OnWriteWaiting shouldn't be called"); }
  69     virtual void OnExceptionWaiting()
  70         { wxFAIL_MSG("OnExceptionWaiting shouldn't be called"); }
  71
  72 private:
  73     // DirectFB -> wxWidgets events translation
  74     void HandleDFBEvent(const wxDFBEvent& event);
  75
  76     int m_fd;
  77     size_t m_offset;
  78     DFBEvent m_event;
  79 };
  80
  81 void wxDFBEventsHandler::OnReadWaiting()
  82 {
  83     for ( ;; )
  84     {
  85         int size = read(m_fd,
  86                         ((char*)&m_event) + m_offset,
  87                         sizeof(m_event) - m_offset);
  88
  89         if ( size == 0 || (size == -1 && (errno == EAGAIN || errno == EINTR)) )
  90         {
  91             // nothing left in the pipe (EAGAIN is expected for an FD with
  92             // O_NONBLOCK)
  93             break;
  94         }
  95
  96         if ( size == -1 )
  97         {
  98             wxLogSysError(_("Failed to read event from DirectFB pipe"));
  99             break;
 100         }
 101
 102         size += m_offset;
 103         m_offset = 0;
 104
 105         if ( size != sizeof(m_event) )
 106         {
 107             m_offset = size;
 108             break;
 109         }
 110
 111         HandleDFBEvent(m_event);
 112     }
 113 }
 114
 115 void wxDFBEventsHandler::HandleDFBEvent(const wxDFBEvent& event)
 116 {
 117     switch ( event.GetClass() )
 118     {
 119         case DFEC_WINDOW:
 120         {
 121             wxDFBWindowEvent winevent(((const DFBEvent&)event).window);
 122             wxNonOwnedWindow::HandleDFBWindowEvent(winevent);
 123             break;
 124         }
 125
 126         case DFEC_NONE:
 127         case DFEC_INPUT:
 128         case DFEC_USER:
 129 #if wxCHECK_DFB_VERSION(0,9,23)
 130         case DFEC_UNIVERSAL:
 131 #endif
 132         {
 133             wxLogTrace(TRACE_EVENTS,
 134                        "ignoring event of unsupported class %i",
 135                        (int)event.GetClass());
 136         }
 137     }
 138 }
 139
 140 //-----------------------------------------------------------------------------
 141 // wxEventLoop initialization
 142 //-----------------------------------------------------------------------------
 143
 144 wxIDirectFBEventBufferPtr wxGUIEventLoop::ms_buffer;
 145 int wxGUIEventLoop::ms_bufferFd;
 146 static wxDFBEventsHandler gs_DFBEventsHandler;
 147
 148 wxGUIEventLoop::wxGUIEventLoop()
 149 {
 150     // Note that this has to be done here so that the buffer is ready when
 151     // an event loop runs; GetDirectFBEventBuffer(), which also calls
 152     // InitBuffer(), may be called before or after the first wxGUIEventLoop
 153     // instance is created.
 154     if ( !ms_buffer )
 155         InitBuffer();
 156 }
 157
 158 /* static */
 159 void wxGUIEventLoop::InitBuffer()
 160 {
 161     // create DirectFB events buffer:
 162     ms_buffer = wxIDirectFB::Get()->CreateEventBuffer();
 163
 164     // and setup a file descriptor that we can watch for new events:
 165
 166     ms_buffer->CreateFileDescriptor(&ms_bufferFd);
 167     int flags = fcntl(ms_bufferFd, F_GETFL, 0);
 168     if ( flags == -1 || fcntl(ms_bufferFd, F_SETFL, flags | O_NONBLOCK) == -1 )
 169     {
 170         wxLogSysError(_("Failed to switch DirectFB pipe to non-blocking mode"));
 171         return;
 172     }
 173
 174     wxFDIODispatcher *dispatcher = wxFDIODispatcher::Get();
 175     wxCHECK_RET( dispatcher, "wxDFB requires wxFDIODispatcher" );
 176
 177     gs_DFBEventsHandler.SetFD(ms_bufferFd);
 178     dispatcher->RegisterFD(ms_bufferFd, &gs_DFBEventsHandler, wxFDIO_INPUT);
 179 }
 180
 181 /* static */
 182 void wxGUIEventLoop::CleanUp()
 183 {
 184     wxFDIODispatcher *dispatcher = wxFDIODispatcher::Get();
 185     wxCHECK_RET( dispatcher, "wxDFB requires wxFDIODispatcher" );
 186     dispatcher->UnregisterFD(ms_bufferFd);
 187
 188     ms_buffer.Reset();
 189     gs_DFBEventsHandler.Reset();
 190 }
 191
 192 /* static */
 193 wxIDirectFBEventBufferPtr wxGUIEventLoop::GetDirectFBEventBuffer()
 194 {
 195     if ( !ms_buffer )
 196         InitBuffer();
 197
 198     return ms_buffer;
 199 }
 200
 201 //-----------------------------------------------------------------------------
 202 // events dispatch and loop handling
 203 //-----------------------------------------------------------------------------
 204
 205 void wxGUIEventLoop::Yield()
 206 {
 207     // process all pending events:
 208     while ( Pending() )
 209         Dispatch();
 210
 211     // handle timers, sockets etc.
 212     OnNextIteration();
 213 }