src/gtk/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/evtloop.cpp
   3 // Purpose:     implements wxEventLoop for GTK+
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     10.07.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // License:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #include "wx/evtloop.h"
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/app.h"
  31 #endif // WX_PRECOMP
  32
  33 #include <gtk/gtk.h>
  34
  35 // ============================================================================
  36 // wxEventLoop implementation
  37 // ============================================================================
  38
  39 // ----------------------------------------------------------------------------
  40 // wxEventLoop running and exiting
  41 // ----------------------------------------------------------------------------
  42
  43 wxGUIEventLoop::wxGUIEventLoop()
  44 {
  45     m_exitcode = 0;
  46 }
  47
  48 int wxGUIEventLoop::Run()
  49 {
  50     // event loops are not recursive, you need to create another loop!
  51     wxCHECK_MSG( !IsRunning(), -1, "can't reenter a message loop" );
  52
  53     wxEventLoopActivator activate(this);
  54
  55     gtk_main();
  56
  57     OnExit();
  58
  59     return m_exitcode;
  60 }
  61
  62 void wxGUIEventLoop::Exit(int rc)
  63 {
  64     wxCHECK_RET( IsRunning(), "can't call Exit() if not running" );
  65
  66     m_exitcode = rc;
  67
  68     gtk_main_quit();
  69 }
  70
  71 void wxGUIEventLoop::WakeUp()
  72 {
  73     // TODO: idle events handling should really be done by wxEventLoop itself
  74     //       but for now it's completely in gtk/app.cpp so just call there when
  75     //       we have wxTheApp and hope that it doesn't matter that we do
  76     //       nothing when we don't...
  77     if ( wxTheApp )
  78         wxTheApp->WakeUpIdle();
  79 }
  80
  81 // ----------------------------------------------------------------------------
  82 // wxEventLoop message processing dispatching
  83 // ----------------------------------------------------------------------------
  84
  85 bool wxGUIEventLoop::Pending() const
  86 {
  87     if ( wxTheApp )
  88     {
  89         // this avoids false positives from our idle source
  90         return wxTheApp->EventsPending();
  91     }
  92
  93     return gtk_events_pending() != 0;
  94 }
  95
  96 bool wxGUIEventLoop::Dispatch()
  97 {
  98     wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") );
  99
 100     // gtk_main_iteration() returns TRUE only if gtk_main_quit() was called
 101     return !gtk_main_iteration();
 102 }
 103
 104 extern "C" {
 105 static gboolean wx_event_loop_timeout(void* data)
 106 {
 107     bool* expired = static_cast<bool*>(data);
 108     *expired = true;
 109
 110     // return FALSE to remove this timeout
 111     return FALSE;
 112 }
 113 }
 114
 115 int wxGUIEventLoop::DispatchTimeout(unsigned long timeout)
 116 {
 117     bool expired = false;
 118     const unsigned id = g_timeout_add(timeout, wx_event_loop_timeout, &expired);
 119     bool quit = gtk_main_iteration() != 0;
 120
 121     if ( expired )
 122         return -1;
 123
 124     g_source_remove(id);
 125
 126     return !quit;
 127 }
 128
 129