src/x11/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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 // for compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #include "wx/evtloop.h"
  24
  25 #ifndef WX_PRECOMP
  26     #include "wx/hash.h"
  27     #include "wx/app.h"
  28     #include "wx/window.h"
  29     #include "wx/module.h"
  30 #endif
  31
  32 #include "wx/private/selectdispatcher.h"
  33 #include "wx/unix/private.h"
  34 #include "wx/x11/private.h"
  35 #include "X11/Xlib.h"
  36 #include "wx/generic/private/timer.h"
  37
  38 #if wxUSE_THREADS
  39     #include "wx/thread.h"
  40 #endif
  41
  42 #include <sys/time.h>
  43 #include <unistd.h>
  44
  45 #ifdef HAVE_SYS_SELECT_H
  46 #   include <sys/select.h>
  47 #endif
  48
  49 // ----------------------------------------------------------------------------
  50 // wxEventLoopImpl
  51 // ----------------------------------------------------------------------------
  52
  53 class WXDLLEXPORT wxEventLoopImpl
  54 {
  55 public:
  56     // ctor
  57     wxEventLoopImpl() { SetExitCode(0); m_keepGoing = false; }
  58
  59     // process an XEvent, return true if it was processed
  60     bool ProcessEvent(XEvent* event);
  61
  62     // generate an idle message, return true if more idle time requested
  63     bool SendIdleEvent();
  64
  65     // set/get the exit code
  66     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
  67     int GetExitCode() const { return m_exitcode; }
  68
  69 public:
  70     // preprocess an event, return true if processed (i.e. no further
  71     // dispatching required)
  72     bool PreProcessEvent(XEvent* event);
  73
  74     // the exit code of the event loop
  75     int m_exitcode;
  76
  77     bool m_keepGoing;
  78 };
  79
  80 // ============================================================================
  81 // wxEventLoopImpl implementation
  82 // ============================================================================
  83
  84 // ----------------------------------------------------------------------------
  85 // wxEventLoopImpl message processing
  86 // ----------------------------------------------------------------------------
  87
  88 bool wxEventLoopImpl::ProcessEvent(XEvent *event)
  89 {
  90     // give us the chance to preprocess the message first
  91     if ( PreProcessEvent(event) )
  92         return true;
  93
  94     // if it wasn't done, dispatch it to the corresponding window
  95     if (wxTheApp)
  96         return wxTheApp->ProcessXEvent((WXEvent*) event);
  97
  98     return false;
  99 }
 100
 101 bool wxEventLoopImpl::PreProcessEvent(XEvent *event)
 102 {
 103     // TODO
 104 #if 0
 105     HWND hWnd = msg->hwnd;
 106     wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hWnd);
 107
 108
 109     // try translations first; find the youngest window with a translation
 110     // table.
 111     wxWindow *wnd;
 112     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 113     {
 114         if ( wnd->MSWTranslateMessage((WXMSG *)msg) )
 115             return true;
 116     }
 117
 118     // Anyone for a non-translation message? Try youngest descendants first.
 119     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 120     {
 121         if ( wnd->MSWProcessMessage((WXMSG *)msg) )
 122             return true;
 123     }
 124 #endif
 125
 126     return false;
 127 }
 128
 129 // ----------------------------------------------------------------------------
 130 // wxEventLoopImpl idle event processing
 131 // ----------------------------------------------------------------------------
 132
 133 bool wxEventLoopImpl::SendIdleEvent()
 134 {
 135     return wxTheApp->ProcessIdle();
 136 }
 137
 138 // ============================================================================
 139 // wxEventLoop implementation
 140 // ============================================================================
 141
 142 // ----------------------------------------------------------------------------
 143 // wxEventLoop running and exiting
 144 // ----------------------------------------------------------------------------
 145
 146 wxEventLoop::~wxEventLoop()
 147 {
 148     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
 149 }
 150
 151 int wxEventLoop::Run()
 152 {
 153     // event loops are not recursive, you need to create another loop!
 154     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
 155
 156     m_impl = new wxEventLoopImpl;
 157
 158     wxEventLoopActivator activate(this);
 159
 160     m_impl->m_keepGoing = true;
 161     while ( m_impl->m_keepGoing )
 162     {
 163         // generate and process idle events for as long as we don't have
 164         // anything else to do
 165         while ( ! Pending() )
 166         {
 167 #if wxUSE_TIMER
 168             wxGenericTimerImpl::NotifyTimers(); // TODO: is this the correct place for it?
 169 #endif
 170             if (!m_impl->SendIdleEvent())
 171             {
 172                 // Break out of while loop
 173                 break;
 174             }
 175         }
 176
 177         // a message came or no more idle processing to do, sit in Dispatch()
 178         // waiting for the next message
 179         if ( !Dispatch() )
 180         {
 181             break;
 182         }
 183     }
 184
 185     OnExit();
 186
 187     int exitcode = m_impl->GetExitCode();
 188     delete m_impl;
 189     m_impl = NULL;
 190
 191     return exitcode;
 192 }
 193
 194 void wxEventLoop::Exit(int rc)
 195 {
 196     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
 197
 198     m_impl->SetExitCode(rc);
 199     m_impl->m_keepGoing = false;
 200 }
 201
 202 // ----------------------------------------------------------------------------
 203 // wxEventLoop message processing dispatching
 204 // ----------------------------------------------------------------------------
 205
 206 bool wxEventLoop::Pending() const
 207 {
 208     XFlush( wxGlobalDisplay() );
 209     return (XPending( wxGlobalDisplay() ) > 0);
 210 }
 211
 212 bool wxEventLoop::Dispatch()
 213 {
 214     XEvent event;
 215
 216     // Start off by checking if any of our child processes have finished.
 217     wxCheckForFinishedChildren();
 218
 219     // TODO allowing for threads, as per e.g. wxMSW
 220
 221     // This now waits until either an X event is received,
 222     // or the select times out. So we should now process
 223     // wxTimers in a reasonably timely fashion. However it
 224     // does also mean that idle processing will happen more
 225     // often, so we should probably limit idle processing to
 226     // not be repeated more than every N milliseconds.
 227
 228     if (XPending( wxGlobalDisplay() ) == 0)
 229     {
 230 #if wxUSE_NANOX
 231         GR_TIMEOUT timeout = 10; // Milliseconds
 232         // Wait for next event, or timeout
 233         GrGetNextEventTimeout(& event, timeout);
 234
 235         // Fall through to ProcessEvent.
 236         // we'll assume that ProcessEvent will just ignore
 237         // the event if there was a timeout and no event.
 238
 239 #else
 240         struct timeval tv;
 241         tv.tv_sec=0;
 242         tv.tv_usec=10000; // TODO make this configurable
 243         int fd = ConnectionNumber( wxGlobalDisplay() );
 244
 245         fd_set readset;
 246         fd_set writeset;
 247         wxFD_ZERO(&readset);
 248         wxFD_ZERO(&writeset);
 249         wxFD_SET(fd, &readset);
 250
 251         if (select( fd+1, &readset, &writeset, NULL, &tv ) != 0)
 252         {
 253             // An X11 event was pending, get it
 254             if (wxFD_ISSET( fd, &readset ))
 255                 XNextEvent( wxGlobalDisplay(), &event );
 256         }
 257 #endif
 258     }
 259     else
 260     {
 261         XNextEvent( wxGlobalDisplay(), &event );
 262     }
 263
 264 #if wxUSE_SOCKETS
 265     // handle any pending socket events:
 266     wxSelectDispatcher::Get().RunLoop(0);
 267 #endif
 268
 269     (void) m_impl->ProcessEvent( &event );
 270     return true;
 271 }