src/gtk1/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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 // Licence:     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     #include "wx/log.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 // wxGUIEventLoop implementation
  57 // ============================================================================
  58
  59 // ----------------------------------------------------------------------------
  60 // wxGUIEventLoop running and exiting
  61 // ----------------------------------------------------------------------------
  62
  63 wxGUIEventLoop::~wxGUIEventLoop()
  64 {
  65     wxASSERT_MSG( !m_impl, wxT("should have been deleted in Run()") );
  66 }
  67
  68 int wxGUIEventLoop::DoRun()
  69 {
  70     m_impl = new wxEventLoopImpl;
  71
  72     gtk_main();
  73
  74     OnExit();
  75
  76     int exitcode = m_impl->GetExitCode();
  77     wxDELETE(m_impl);
  78
  79     return exitcode;
  80 }
  81
  82 void wxGUIEventLoop::Exit(int rc)
  83 {
  84     wxCHECK_RET( IsRunning(), wxT("can't call Exit() if not running") );
  85
  86     m_impl->SetExitCode(rc);
  87
  88     gtk_main_quit();
  89 }
  90
  91 // ----------------------------------------------------------------------------
  92 // wxEventLoop message processing dispatching
  93 // ----------------------------------------------------------------------------
  94
  95 bool wxGUIEventLoop::Pending() const
  96 {
  97     if (wxTheApp)
  98     {
  99         // We need to remove idle callbacks or gtk_events_pending will
 100         // never return false.
 101         wxTheApp->RemoveIdleTag();
 102     }
 103
 104     return gtk_events_pending();
 105 }
 106
 107 bool wxGUIEventLoop::Dispatch()
 108 {
 109     wxCHECK_MSG( IsRunning(), false, wxT("can't call Dispatch() if not running") );
 110
 111     gtk_main_iteration();
 112
 113     return true;
 114 }
 115
 116 //-----------------------------------------------------------------------------
 117 // wxYield
 118 //-----------------------------------------------------------------------------
 119
 120 bool wxGUIEventLoop::YieldFor(long eventsToProcess)
 121 {
 122 #if wxUSE_THREADS
 123     if ( !wxThread::IsMain() )
 124     {
 125         // can't call gtk_main_iteration() from other threads like this
 126         return true;
 127     }
 128 #endif // wxUSE_THREADS
 129
 130     m_isInsideYield = true;
 131     m_eventsToProcessInsideYield = eventsToProcess;
 132
 133     // We need to remove idle callbacks or the loop will
 134     // never finish.
 135     wxTheApp->RemoveIdleTag();
 136
 137 #if wxUSE_LOG
 138     // disable log flushing from here because a call to wxYield() shouldn't
 139     // normally result in message boxes popping up &c
 140     wxLog::Suspend();
 141 #endif
 142
 143     // TODO: implement event filtering using the eventsToProcess mask
 144     while (gtk_events_pending())
 145         gtk_main_iteration();
 146
 147     // It's necessary to call ProcessIdle() to update the frames sizes which
 148     // might have been changed (it also will update other things set from
 149     // OnUpdateUI() which is a nice (and desired) side effect). But we
 150     // call ProcessIdle() only once since this is not meant for longish
 151     // background jobs (controlled by wxIdleEvent::RequestMore() and the
 152     // return value of Processidle().
 153     ProcessIdle();
 154
 155 #if wxUSE_LOG
 156     // let the logs be flashed again
 157     wxLog::Resume();
 158 #endif
 159
 160     m_isInsideYield = false;
 161
 162     return true;
 163 }