src/mgl/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        mgl/evtloop.cpp
   3 // Purpose:     implements wxEventLoop for MGL
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 2001 SciTech Software, Inc. (www.scitechsoft.com)
   7 // License:     wxWindows license
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // ----------------------------------------------------------------------------
  11 // headers
  12 // ----------------------------------------------------------------------------
  13
  14 #ifdef __GNUG__
  15     #pragma implementation "evtloop.h"
  16 #endif
  17
  18 // For compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22     #pragma hdrstop
  23 #endif
  24
  25 #ifndef WX_PRECOMP
  26     #include "wx/window.h"
  27     #include "wx/app.h"
  28     #include "wx/thread.h"
  29 #endif //WX_PRECOMP
  30
  31 #include "wx/evtloop.h"
  32
  33 #include "wx/mgl/private.h"
  34
  35 // ----------------------------------------------------------------------------
  36 // wxEventLoopImpl
  37 // ----------------------------------------------------------------------------
  38
  39 class WXDLLEXPORT wxEventLoopImpl
  40 {
  41 public:
  42     // ctor
  43     wxEventLoopImpl()
  44         {
  45             SetExitCode(0);
  46             SetKeepLooping(TRUE);
  47         }
  48
  49     // process an event
  50     void Dispatch();
  51
  52     // generate an idle event, return TRUE if more idle time requested
  53     bool SendIdleEvent();
  54
  55     // set/get the exit code
  56     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  57     int GetExitCode() const { return m_exitcode; }
  58
  59     void SetKeepLooping(bool k) { m_keepLooping = k; }
  60     bool GetKeepLooping() const { return m_keepLooping; }
  61
  62 private:
  63
  64     // the exit code of the event loop
  65     int m_exitcode;
  66     // FALSE if the loop should end
  67     bool m_keepLooping;
  68 };
  69
  70 // ============================================================================
  71 // wxEventLoopImpl implementation
  72 // ============================================================================
  73
  74 void wxEventLoopImpl::Dispatch()
  75 {
  76     event_t evt;
  77     ibool rc;
  78
  79     MGL_wmUpdateDC(g_winMng);
  80
  81     EVT_halt(&evt, EVT_EVERYEVT);
  82     MGL_wmProcessEvent(g_winMng, &evt);
  83 }
  84
  85 bool wxEventLoopImpl::SendIdleEvent()
  86 {
  87     wxIdleEvent event;
  88
  89     return wxTheApp->ProcessEvent(event) && event.MoreRequested();
  90 }
  91
  92 // ============================================================================
  93 // wxEventLoop implementation
  94 // ============================================================================
  95
  96 // ----------------------------------------------------------------------------
  97 // wxEventLoop running and exiting
  98 // ----------------------------------------------------------------------------
  99
 100 wxEventLoop *wxEventLoop::ms_activeLoop = NULL;
 101
 102 wxEventLoop::~wxEventLoop()
 103 {
 104     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
 105 }
 106
 107 bool wxEventLoop::IsRunning() const
 108 {
 109     return m_impl != NULL;
 110 }
 111
 112 int wxEventLoop::Run()
 113 {
 114     // event loops are not recursive, you need to create another loop!
 115     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
 116
 117     m_impl = new wxEventLoopImpl;
 118
 119     wxEventLoop *oldLoop = ms_activeLoop;
 120     ms_activeLoop = this;
 121
 122     for ( ;; )
 123     {
 124 #if wxUSE_THREADS
 125         //wxMutexGuiLeaveOrEnter(); // FIXME_MGL - huh?
 126 #endif // wxUSE_THREADS
 127
 128         // generate and process idle events for as long as we don't have
 129         // anything else to do
 130         while ( !Pending() && m_impl->SendIdleEvent() ) {}
 131
 132         // a message came or no more idle processing to do, sit in Dispatch()
 133         // waiting for the next message
 134         if ( !Dispatch() )
 135         {
 136             // app terminated
 137             break;
 138         }
 139     }
 140
 141     int exitcode = m_impl->GetExitCode();
 142     delete m_impl;
 143     m_impl = NULL;
 144
 145     ms_activeLoop = oldLoop;
 146
 147     return exitcode;
 148 }
 149
 150 void wxEventLoop::Exit(int rc)
 151 {
 152     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
 153
 154     m_impl->SetExitCode(rc);
 155     m_impl->SetKeepLooping(FALSE);
 156 }
 157
 158 // ----------------------------------------------------------------------------
 159 // wxEventLoop message processing dispatching
 160 // ----------------------------------------------------------------------------
 161
 162 bool wxEventLoop::Pending() const
 163 {
 164     event_t evt;
 165     return EVT_peekNext(&evt, EVT_EVERYEVT);
 166 }
 167
 168 bool wxEventLoop::Dispatch()
 169 {
 170     wxCHECK_MSG( IsRunning(), FALSE, _T("can't call Dispatch() if not running") );
 171
 172     m_impl->Dispatch();
 173     return m_impl->GetKeepLooping();
 174 }