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 #include "wx/timer.h"
  33 #include "wx/mgl/private.h"
  34 #include "pmapi.h"
  35
  36 // ----------------------------------------------------------------------------
  37 // wxEventLoopImpl
  38 // ----------------------------------------------------------------------------
  39
  40 class WXDLLEXPORT wxEventLoopImpl
  41 {
  42 public:
  43     // ctor
  44     wxEventLoopImpl()
  45         {
  46             SetExitCode(0);
  47             SetKeepLooping(TRUE);
  48         }
  49
  50     // process an event
  51     void Dispatch();
  52
  53     // generate an idle event, return TRUE if more idle time requested
  54     bool SendIdleEvent();
  55
  56     // set/get the exit code
  57     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  58     int GetExitCode() const { return m_exitcode; }
  59
  60     void SetKeepLooping(bool k) { m_keepLooping = k; }
  61     bool GetKeepLooping() const { return m_keepLooping; }
  62
  63 private:
  64
  65     // the exit code of the event loop
  66     int m_exitcode;
  67     // FALSE if the loop should end
  68     bool m_keepLooping;
  69 };
  70
  71 // ============================================================================
  72 // wxEventLoopImpl implementation
  73 // ============================================================================
  74
  75 void wxEventLoopImpl::Dispatch()
  76 {
  77     event_t evt;
  78
  79     // VS: The code bellow is equal to MGL's EVT_halt implementation, with
  80     //     two things added: sleeping (busy waiting is stupid, lets make CPU's
  81     //     life a bit easier) and timers updating
  82
  83     // EVT_halt(&evt, EVT_EVERYEVT);
  84     for (;;)
  85     {
  86 #if wxUSE_TIMER
  87         wxTimer::NotifyTimers();
  88         MGL_wmUpdateDC(g_winMng);
  89 #endif
  90         EVT_pollJoystick();
  91         if ( EVT_getNext(&evt, EVT_EVERYEVT) ) break;
  92         PM_sleep(10);
  93     }
  94     // end of EVT_halt
  95
  96     MGL_wmProcessEvent(g_winMng, &evt);
  97 }
  98
  99 bool wxEventLoopImpl::SendIdleEvent()
 100 {
 101     wxIdleEvent event;
 102
 103     return wxTheApp->ProcessEvent(event) && event.MoreRequested();
 104 }
 105
 106 // ============================================================================
 107 // wxEventLoop implementation
 108 // ============================================================================
 109
 110 // ----------------------------------------------------------------------------
 111 // wxEventLoop running and exiting
 112 // ----------------------------------------------------------------------------
 113
 114 wxEventLoop *wxEventLoop::ms_activeLoop = NULL;
 115
 116 wxEventLoop::~wxEventLoop()
 117 {
 118     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
 119 }
 120
 121 bool wxEventLoop::IsRunning() const
 122 {
 123     return m_impl != NULL;
 124 }
 125
 126 int wxEventLoop::Run()
 127 {
 128     // event loops are not recursive, you need to create another loop!
 129     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
 130
 131     m_impl = new wxEventLoopImpl;
 132
 133     wxEventLoop *oldLoop = ms_activeLoop;
 134     ms_activeLoop = this;
 135
 136     for ( ;; )
 137     {
 138 #if wxUSE_THREADS
 139         //wxMutexGuiLeaveOrEnter(); // FIXME_MGL - huh?
 140 #endif // wxUSE_THREADS
 141
 142         // generate and process idle events for as long as we don't have
 143         // anything else to do
 144         while ( !Pending() && m_impl->SendIdleEvent() ) {}
 145
 146         // a message came or no more idle processing to do, sit in Dispatch()
 147         // waiting for the next message
 148         if ( !Dispatch() )
 149         {
 150             // app terminated
 151             break;
 152         }
 153     }
 154
 155     int exitcode = m_impl->GetExitCode();
 156     delete m_impl;
 157     m_impl = NULL;
 158
 159     ms_activeLoop = oldLoop;
 160
 161     return exitcode;
 162 }
 163
 164 void wxEventLoop::Exit(int rc)
 165 {
 166     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
 167
 168     m_impl->SetExitCode(rc);
 169     m_impl->SetKeepLooping(FALSE);
 170
 171     // Send a dummy event so that the app won't block in EVT_halt if there
 172     // are no user-generated events in the queue:
 173     EVT_post(0, EVT_USEREVT, 0, 0);
 174 }
 175
 176 // ----------------------------------------------------------------------------
 177 // wxEventLoop message processing dispatching
 178 // ----------------------------------------------------------------------------
 179
 180 bool wxEventLoop::Pending() const
 181 {
 182     event_t evt;
 183     return EVT_peekNext(&evt, EVT_EVERYEVT);
 184 }
 185
 186 bool wxEventLoop::Dispatch()
 187 {
 188     wxCHECK_MSG( IsRunning(), FALSE, _T("can't call Dispatch() if not running") );
 189
 190     m_impl->Dispatch();
 191     return m_impl->GetKeepLooping();
 192 }