src/gtk/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "evtloop.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32 #endif //WX_PRECOMP
  33
  34 #include "wx/app.h"
  35 #include "wx/evtloop.h"
  36
  37 #include <gtk/gtk.h>
  38
  39 // ----------------------------------------------------------------------------
  40 // wxEventLoopImpl
  41 // ----------------------------------------------------------------------------
  42
  43 class WXDLLEXPORT wxEventLoopImpl
  44 {
  45 public:
  46     // ctor
  47     wxEventLoopImpl() { SetExitCode(0); }
  48
  49     // set/get the exit code
  50     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  51     int GetExitCode() const { return m_exitcode; }
  52
  53 private:
  54     // the exit code of the event loop
  55     int m_exitcode;
  56 };
  57
  58 // ============================================================================
  59 // wxEventLoop implementation
  60 // ============================================================================
  61
  62 // ----------------------------------------------------------------------------
  63 // wxEventLoop running and exiting
  64 // ----------------------------------------------------------------------------
  65
  66 wxEventLoop *wxEventLoopBase::ms_activeLoop = NULL;
  67
  68 wxEventLoop::~wxEventLoop()
  69 {
  70     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
  71 }
  72
  73 int wxEventLoop::Run()
  74 {
  75     // event loops are not recursive, you need to create another loop!
  76     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
  77
  78     wxEventLoop *oldLoop = ms_activeLoop;
  79     ms_activeLoop = this;
  80
  81     m_impl = new wxEventLoopImpl;
  82
  83     gtk_main();
  84
  85     int exitcode = m_impl->GetExitCode();
  86     delete m_impl;
  87     m_impl = NULL;
  88
  89     ms_activeLoop = oldLoop;
  90
  91     return exitcode;
  92 }
  93
  94 void wxEventLoop::Exit(int rc)
  95 {
  96     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
  97
  98     m_impl->SetExitCode(rc);
  99
 100     gtk_main_quit();
 101 }
 102
 103 // ----------------------------------------------------------------------------
 104 // wxEventLoop message processing dispatching
 105 // ----------------------------------------------------------------------------
 106
 107 extern bool g_isIdle;
 108
 109 bool wxEventLoop::Pending() const
 110 {
 111     if (wxTheApp && !g_isIdle)
 112     {
 113         // We need to remove idle callbacks or gtk_events_pending will
 114         // never return false.
 115         gtk_idle_remove( wxTheApp->m_idleTag );
 116         wxTheApp->m_idleTag = 0;
 117         g_isIdle = TRUE;
 118     }
 119
 120     return gtk_events_pending();
 121 }
 122
 123 bool wxEventLoop::Dispatch()
 124 {
 125     wxCHECK_MSG( IsRunning(), FALSE, _T("can't call Dispatch() if not running") );
 126
 127     gtk_main_iteration();
 128
 129     return TRUE;
 130 }
 131