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 #include "wx/ptr_scpd.h"
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/app.h"
  32 #endif // WX_PRECOMP
  33
  34 #include <gtk/gtk.h>
  35
  36 // ----------------------------------------------------------------------------
  37 // wxEventLoopImpl
  38 // ----------------------------------------------------------------------------
  39
  40 class WXDLLEXPORT wxEventLoopImpl
  41 {
  42 public:
  43     // ctor
  44     wxEventLoopImpl() { SetExitCode(0); }
  45
  46     // set/get the exit code
  47     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  48     int GetExitCode() const { return m_exitcode; }
  49
  50 private:
  51     // the exit code of the event loop
  52     int m_exitcode;
  53 };
  54
  55 // ============================================================================
  56 // wxEventLoop implementation
  57 // ============================================================================
  58
  59 wxDEFINE_TIED_SCOPED_PTR_TYPE(wxEventLoopImpl)
  60
  61 // ----------------------------------------------------------------------------
  62 // wxEventLoop running and exiting
  63 // ----------------------------------------------------------------------------
  64
  65 wxGUIEventLoop::~wxGUIEventLoop()
  66 {
  67     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
  68 }
  69
  70 int wxGUIEventLoop::Run()
  71 {
  72     // event loops are not recursive, you need to create another loop!
  73     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
  74
  75     wxEventLoopActivator activate(this);
  76
  77     wxEventLoopImplTiedPtr impl(&m_impl, new wxEventLoopImpl);
  78
  79     gtk_main();
  80
  81     OnExit();
  82
  83     return m_impl->GetExitCode();
  84 }
  85
  86 void wxGUIEventLoop::Exit(int rc)
  87 {
  88     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
  89
  90     m_impl->SetExitCode(rc);
  91
  92     gtk_main_quit();
  93 }
  94
  95 // ----------------------------------------------------------------------------
  96 // wxEventLoop message processing dispatching
  97 // ----------------------------------------------------------------------------
  98
  99 bool wxGUIEventLoop::Pending() const
 100 {
 101     bool pending;
 102     wxApp* app = wxTheApp;
 103     if (app != NULL)
 104         // app->EventsPending() avoids false positives from our idle source
 105         pending = app->EventsPending();
 106     else
 107         pending = gtk_events_pending() != 0;
 108     return pending;
 109 }
 110
 111 bool wxGUIEventLoop::Dispatch()
 112 {
 113     wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") );
 114
 115     // gtk_main_iteration() returns TRUE only if gtk_main_quit() was called
 116     return !gtk_main_iteration();
 117 }