src/x11/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        x11/evtloop.cpp
   3 // Purpose:     implements wxEventLoop for X11
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01.06.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2002 Julian Smart
   9 // License:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "evtloop.h"
  22 #endif
  23
  24 #include "wx/window.h"
  25 #include "wx/app.h"
  26 #include "wx/evtloop.h"
  27 #include "wx/tooltip.h"
  28 #if wxUSE_THREADS
  29 #include "wx/thread.h"
  30 #endif
  31 #include "wx/timer.h"
  32 #include "wx/x11/private.h"
  33 #include "X11/Xlib.h"
  34
  35 // ----------------------------------------------------------------------------
  36 // wxEventLoopImpl
  37 // ----------------------------------------------------------------------------
  38
  39 class WXDLLEXPORT wxEventLoopImpl
  40 {
  41 public:
  42     // ctor
  43     wxEventLoopImpl() { SetExitCode(0); m_keepGoing = FALSE; }
  44
  45     // process an XEvent
  46     void ProcessEvent(XEvent* event);
  47
  48     // generate an idle message, return TRUE if more idle time requested
  49     bool SendIdleEvent();
  50
  51     // set/get the exit code
  52     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  53     int GetExitCode() const { return m_exitcode; }
  54
  55 public:
  56     // preprocess an event, return TRUE if processed (i.e. no further
  57     // dispatching required)
  58     bool PreProcessEvent(XEvent* event);
  59
  60     // the exit code of the event loop
  61     int m_exitcode;
  62
  63     bool m_keepGoing;
  64 };
  65
  66 // ============================================================================
  67 // wxEventLoopImpl implementation
  68 // ============================================================================
  69
  70 // ----------------------------------------------------------------------------
  71 // wxEventLoopImpl message processing
  72 // ----------------------------------------------------------------------------
  73
  74 void wxEventLoopImpl::ProcessEvent(XEvent *event)
  75 {
  76     // give us the chance to preprocess the message first
  77     if ( !PreProcessEvent(event) )
  78     {
  79         // if it wasn't done, dispatch it to the corresponding window
  80         if (wxTheApp)
  81             wxTheApp->ProcessXEvent((WXEvent*) event);
  82     }
  83 }
  84
  85 bool wxEventLoopImpl::PreProcessEvent(XEvent *event)
  86 {
  87     // TODO
  88 #if 0
  89     HWND hWnd = msg->hwnd;
  90     wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hWnd);
  91
  92
  93     // try translations first; find the youngest window with a translation
  94     // table.
  95     wxWindow *wnd;
  96     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
  97     {
  98         if ( wnd->MSWTranslateMessage((WXMSG *)msg) )
  99             return TRUE;
 100     }
 101
 102     // Anyone for a non-translation message? Try youngest descendants first.
 103     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 104     {
 105         if ( wnd->MSWProcessMessage((WXMSG *)msg) )
 106             return TRUE;
 107     }
 108 #endif
 109
 110     return FALSE;
 111 }
 112
 113 // ----------------------------------------------------------------------------
 114 // wxEventLoopImpl idle event processing
 115 // ----------------------------------------------------------------------------
 116
 117 bool wxEventLoopImpl::SendIdleEvent()
 118 {
 119     wxIdleEvent event;
 120     event.SetEventObject(wxTheApp);
 121
 122     return wxTheApp->ProcessEvent(event) && event.MoreRequested();
 123 }
 124
 125 // ============================================================================
 126 // wxEventLoop implementation
 127 // ============================================================================
 128
 129 wxEventLoop *wxEventLoop::ms_activeLoop = NULL;
 130
 131 // ----------------------------------------------------------------------------
 132 // wxEventLoop running and exiting
 133 // ----------------------------------------------------------------------------
 134
 135 wxEventLoop::~wxEventLoop()
 136 {
 137     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
 138 }
 139
 140 bool wxEventLoop::IsRunning() const
 141 {
 142     return m_impl != NULL;
 143 }
 144
 145 int wxEventLoop::Run()
 146 {
 147     // event loops are not recursive, you need to create another loop!
 148     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
 149
 150     m_impl = new wxEventLoopImpl;
 151
 152     wxEventLoop *oldLoop = ms_activeLoop;
 153     ms_activeLoop = this;
 154
 155     m_impl->m_keepGoing = TRUE;
 156     while ( m_impl->m_keepGoing )
 157     {
 158 #if 0 // wxUSE_THREADS
 159         wxMutexGuiLeaveOrEnter();
 160 #endif // wxUSE_THREADS
 161
 162         // generate and process idle events for as long as we don't have
 163         // anything else to do
 164         while ( ! Pending() )
 165         {
 166             wxTimer::NotifyTimers(); // TODO: is this the correct place for it?
 167             if (!m_impl->SendIdleEvent())
 168             {
 169 #if 0 // wxUSE_THREADS
 170                 // leave the main loop to give other threads a chance to
 171                 // perform their GUI work
 172                 wxMutexGuiLeave();
 173                 wxUsleep(20);
 174                 wxMutexGuiEnter();
 175 #endif
 176                 // Break out of while loop
 177                 break;
 178             }
 179         }
 180
 181         // a message came or no more idle processing to do, sit in Dispatch()
 182         // waiting for the next message
 183         if ( !Dispatch() )
 184         {
 185             break;
 186         }
 187     }
 188
 189     int exitcode = m_impl->GetExitCode();
 190     delete m_impl;
 191     m_impl = NULL;
 192
 193     ms_activeLoop = oldLoop;
 194
 195     return exitcode;
 196 }
 197
 198 void wxEventLoop::Exit(int rc)
 199 {
 200     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
 201
 202     m_impl->SetExitCode(rc);
 203     m_impl->m_keepGoing = FALSE;
 204 }
 205
 206 // ----------------------------------------------------------------------------
 207 // wxEventLoop message processing dispatching
 208 // ----------------------------------------------------------------------------
 209
 210 bool wxEventLoop::Pending() const
 211 {
 212     XFlush((Display*) wxGetDisplay());
 213     return (XPending((Display*) wxGetDisplay()) > 0);
 214 }
 215
 216 bool wxEventLoop::Dispatch()
 217 {
 218     XEvent event;
 219
 220     // TODO allowing for threads, as per e.g. wxMSW
 221
 222     XNextEvent((Display*) wxGetDisplay(), & event);
 223     m_impl->ProcessEvent(& event);
 224     return TRUE;
 225 }
 226