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::Run()
  69 {
  70     // event loops are not recursive, you need to create another loop!
  71     wxCHECK_MSG( !IsRunning(), -1, wxT("can't reenter a message loop") );
  72
  73     wxEventLoopActivator activate(this);
  74
  75     m_impl = new wxEventLoopImpl;
  76
  77     gtk_main();
  78
  79     OnExit();
  80
  81     int exitcode = m_impl->GetExitCode();
  82     wxDELETE(m_impl);
  83
  84     return exitcode;
  85 }
  86
  87 void wxGUIEventLoop::Exit(int rc)
  88 {
  89     wxCHECK_RET( IsRunning(), wxT("can't call Exit() if not running") );
  90
  91     m_impl->SetExitCode(rc);
  92
  93     gtk_main_quit();
  94 }
  95
  96 // ----------------------------------------------------------------------------
  97 // wxEventLoop message processing dispatching
  98 // ----------------------------------------------------------------------------
  99
 100 bool wxGUIEventLoop::Pending() const
 101 {
 102     if (wxTheApp)
 103     {
 104         // We need to remove idle callbacks or gtk_events_pending will
 105         // never return false.
 106         wxTheApp->RemoveIdleTag();
 107     }
 108
 109     return gtk_events_pending();
 110 }
 111
 112 bool wxGUIEventLoop::Dispatch()
 113 {
 114     wxCHECK_MSG( IsRunning(), false, wxT("can't call Dispatch() if not running") );
 115
 116     gtk_main_iteration();
 117
 118     return true;
 119 }
 120
 121 //-----------------------------------------------------------------------------
 122 // wxYield
 123 //-----------------------------------------------------------------------------
 124
 125 bool wxGUIEventLoop::YieldFor(long eventsToProcess)
 126 {
 127 #if wxUSE_THREADS
 128     if ( !wxThread::IsMain() )
 129     {
 130         // can't call gtk_main_iteration() from other threads like this
 131         return true;
 132     }
 133 #endif // wxUSE_THREADS
 134
 135     m_isInsideYield = true;
 136     m_eventsToProcessInsideYield = eventsToProcess;
 137
 138     // We need to remove idle callbacks or the loop will
 139     // never finish.
 140     wxTheApp->RemoveIdleTag();
 141
 142 #if wxUSE_LOG
 143     // disable log flushing from here because a call to wxYield() shouldn't
 144     // normally result in message boxes popping up &c
 145     wxLog::Suspend();
 146 #endif
 147
 148     // TODO: implement event filtering using the eventsToProcess mask
 149     while (gtk_events_pending())
 150         gtk_main_iteration();
 151
 152     // It's necessary to call ProcessIdle() to update the frames sizes which
 153     // might have been changed (it also will update other things set from
 154     // OnUpdateUI() which is a nice (and desired) side effect). But we
 155     // call ProcessIdle() only once since this is not meant for longish
 156     // background jobs (controlled by wxIdleEvent::RequestMore() and the
 157     // return value of Processidle().
 158     ProcessIdle();
 159
 160 #if wxUSE_LOG
 161     // let the logs be flashed again
 162     wxLog::Resume();
 163 #endif
 164
 165     m_isInsideYield = false;
 166
 167     return true;
 168 }