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/timer.h"
  30     #include "wx/module.h"
  31 #endif
  32
  33 #include "wx/tooltip.h"
  34 #include "wx/unix/private.h"
  35 #include "wx/x11/private.h"
  36 #include "X11/Xlib.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 #if wxUSE_SOCKETS
  50 // ----------------------------------------------------------------------------
  51 // wxSocketTable
  52 // ----------------------------------------------------------------------------
  53
  54 typedef void (*wxSocketCallback) (int fd, void* data);
  55
  56 class wxSocketTableEntry: public wxObject
  57 {
  58   public:
  59     wxSocketTableEntry()
  60     {
  61         m_fdInput = -1; m_fdOutput = -1;
  62         m_callbackInput = NULL; m_callbackOutput = NULL;
  63         m_dataInput = NULL; m_dataOutput = NULL;
  64     }
  65
  66     int m_fdInput;
  67     int m_fdOutput;
  68     wxSocketCallback m_callbackInput;
  69     wxSocketCallback m_callbackOutput;
  70     void* m_dataInput;
  71     void* m_dataOutput;
  72 };
  73
  74 typedef enum
  75 { wxSocketTableInput, wxSocketTableOutput } wxSocketTableType ;
  76
  77 class wxSocketTable: public wxHashTable
  78 {
  79   public:
  80     wxSocketTable(): wxHashTable(wxKEY_INTEGER)
  81     {
  82     }
  83     virtual ~wxSocketTable()
  84     {
  85         WX_CLEAR_HASH_TABLE(*this)
  86     }
  87
  88     wxSocketTableEntry* FindEntry(int fd);
  89
  90     void RegisterCallback(int fd, wxSocketTableType socketType, wxSocketCallback callback, void* data);
  91
  92     void UnregisterCallback(int fd, wxSocketTableType socketType);
  93
  94     bool CallCallback(int fd, wxSocketTableType socketType);
  95
  96     void FillSets(fd_set* readset, fd_set* writeset, int* highest);
  97
  98     void ProcessEvents(fd_set* readset, fd_set* writeset);
  99 };
 100
 101 wxSocketTableEntry* wxSocketTable::FindEntry(int fd)
 102 {
 103     wxSocketTableEntry* entry = (wxSocketTableEntry*) Get(fd);
 104     return entry;
 105 }
 106
 107 void wxSocketTable::RegisterCallback(int fd, wxSocketTableType socketType, wxSocketCallback callback, void* data)
 108 {
 109     wxSocketTableEntry* entry = FindEntry(fd);
 110     if (!entry)
 111     {
 112         entry = new wxSocketTableEntry();
 113         Put(fd, entry);
 114     }
 115
 116     if (socketType == wxSocketTableInput)
 117     {
 118         entry->m_fdInput = fd;
 119         entry->m_dataInput = data;
 120         entry->m_callbackInput = callback;
 121     }
 122     else
 123     {
 124         entry->m_fdOutput = fd;
 125         entry->m_dataOutput = data;
 126         entry->m_callbackOutput = callback;
 127     }
 128 }
 129
 130 void wxSocketTable::UnregisterCallback(int fd, wxSocketTableType socketType)
 131 {
 132     wxSocketTableEntry* entry = FindEntry(fd);
 133     if (entry)
 134     {
 135         if (socketType == wxSocketTableInput)
 136         {
 137             entry->m_fdInput = -1;
 138             entry->m_dataInput = NULL;
 139             entry->m_callbackInput = NULL;
 140         }
 141         else
 142         {
 143             entry->m_fdOutput = -1;
 144             entry->m_dataOutput = NULL;
 145             entry->m_callbackOutput = NULL;
 146         }
 147         if (entry->m_fdInput == -1 && entry->m_fdOutput == -1)
 148         {
 149             Delete(fd);
 150             delete entry;
 151         }
 152     }
 153 }
 154
 155 bool wxSocketTable::CallCallback(int fd, wxSocketTableType socketType)
 156 {
 157     wxSocketTableEntry* entry = FindEntry(fd);
 158     if (entry)
 159     {
 160         if (socketType == wxSocketTableInput)
 161         {
 162             if (entry->m_fdInput != -1 && entry->m_callbackInput)
 163             {
 164                 (entry->m_callbackInput) (entry->m_fdInput, entry->m_dataInput);
 165             }
 166         }
 167         else
 168         {
 169             if (entry->m_fdOutput != -1 && entry->m_callbackOutput)
 170             {
 171                 (entry->m_callbackOutput) (entry->m_fdOutput, entry->m_dataOutput);
 172             }
 173         }
 174         return true;
 175     }
 176     else
 177         return false;
 178 }
 179
 180 void wxSocketTable::FillSets(fd_set* readset, fd_set* writeset, int* highest)
 181 {
 182     BeginFind();
 183     wxHashTable::compatibility_iterator node = Next();
 184     while (node)
 185     {
 186         wxSocketTableEntry* entry = (wxSocketTableEntry*) node->GetData();
 187
 188         if (entry->m_fdInput != -1)
 189         {
 190             wxFD_SET(entry->m_fdInput, readset);
 191             if (entry->m_fdInput > *highest)
 192                 * highest = entry->m_fdInput;
 193         }
 194
 195         if (entry->m_fdOutput != -1)
 196         {
 197             wxFD_SET(entry->m_fdOutput, writeset);
 198             if (entry->m_fdOutput > *highest)
 199                 * highest = entry->m_fdOutput;
 200         }
 201
 202         node = Next();
 203     }
 204 }
 205
 206 void wxSocketTable::ProcessEvents(fd_set* readset, fd_set* writeset)
 207 {
 208     BeginFind();
 209     wxHashTable::compatibility_iterator node = Next();
 210     while (node)
 211     {
 212         wxSocketTableEntry* entry = (wxSocketTableEntry*) node->GetData();
 213
 214         if (entry->m_fdInput != -1 && wxFD_ISSET(entry->m_fdInput, readset))
 215         {
 216             (entry->m_callbackInput) (entry->m_fdInput, entry->m_dataInput);
 217         }
 218
 219         if (entry->m_fdOutput != -1 && wxFD_ISSET(entry->m_fdOutput, writeset))
 220         {
 221             (entry->m_callbackOutput) (entry->m_fdOutput, entry->m_dataOutput);
 222         }
 223
 224         node = Next();
 225     }
 226 }
 227
 228 wxSocketTable* wxTheSocketTable = NULL;
 229
 230 class wxSocketTableModule: public wxModule
 231 {
 232 DECLARE_DYNAMIC_CLASS(wxSocketTableModule)
 233 public:
 234     wxSocketTableModule() {}
 235     bool OnInit() { wxTheSocketTable = new wxSocketTable; return true; };
 236     void OnExit() { delete wxTheSocketTable; wxTheSocketTable = NULL; };
 237 };
 238
 239 IMPLEMENT_DYNAMIC_CLASS(wxSocketTableModule, wxModule)
 240
 241 // Implement registration functions as C functions so they
 242 // can be called from gsock11.c
 243
 244 extern "C" void wxRegisterSocketCallback(int fd, wxSocketTableType socketType, wxSocketCallback callback, void* data)
 245 {
 246     if (wxTheSocketTable)
 247     {
 248         wxTheSocketTable->RegisterCallback(fd, socketType, callback, data);
 249     }
 250 }
 251
 252 extern "C" void wxUnregisterSocketCallback(int fd, wxSocketTableType socketType)
 253 {
 254     if (wxTheSocketTable)
 255     {
 256         wxTheSocketTable->UnregisterCallback(fd, socketType);
 257     }
 258 }
 259 #endif
 260
 261 // ----------------------------------------------------------------------------
 262 // wxEventLoopImpl
 263 // ----------------------------------------------------------------------------
 264
 265 class WXDLLEXPORT wxEventLoopImpl
 266 {
 267 public:
 268     // ctor
 269     wxEventLoopImpl() { SetExitCode(0); m_keepGoing = false; }
 270
 271     // process an XEvent, return true if it was processed
 272     bool ProcessEvent(XEvent* event);
 273
 274     // generate an idle message, return true if more idle time requested
 275     bool SendIdleEvent();
 276
 277     // set/get the exit code
 278     void SetExitCode(int exitcode) { m_exitcode = exitcode; }
 279     int GetExitCode() const { return m_exitcode; }
 280
 281 public:
 282     // preprocess an event, return true if processed (i.e. no further
 283     // dispatching required)
 284     bool PreProcessEvent(XEvent* event);
 285
 286     // the exit code of the event loop
 287     int m_exitcode;
 288
 289     bool m_keepGoing;
 290 };
 291
 292 // ============================================================================
 293 // wxEventLoopImpl implementation
 294 // ============================================================================
 295
 296 // ----------------------------------------------------------------------------
 297 // wxEventLoopImpl message processing
 298 // ----------------------------------------------------------------------------
 299
 300 bool wxEventLoopImpl::ProcessEvent(XEvent *event)
 301 {
 302     // give us the chance to preprocess the message first
 303     if ( PreProcessEvent(event) )
 304         return true;
 305
 306     // if it wasn't done, dispatch it to the corresponding window
 307     if (wxTheApp)
 308         return wxTheApp->ProcessXEvent((WXEvent*) event);
 309
 310     return false;
 311 }
 312
 313 bool wxEventLoopImpl::PreProcessEvent(XEvent *event)
 314 {
 315     // TODO
 316 #if 0
 317     HWND hWnd = msg->hwnd;
 318     wxWindow *wndThis = wxGetWindowFromHWND((WXHWND)hWnd);
 319
 320
 321     // try translations first; find the youngest window with a translation
 322     // table.
 323     wxWindow *wnd;
 324     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 325     {
 326         if ( wnd->MSWTranslateMessage((WXMSG *)msg) )
 327             return true;
 328     }
 329
 330     // Anyone for a non-translation message? Try youngest descendants first.
 331     for ( wnd = wndThis; wnd; wnd = wnd->GetParent() )
 332     {
 333         if ( wnd->MSWProcessMessage((WXMSG *)msg) )
 334             return true;
 335     }
 336 #endif
 337
 338     return false;
 339 }
 340
 341 // ----------------------------------------------------------------------------
 342 // wxEventLoopImpl idle event processing
 343 // ----------------------------------------------------------------------------
 344
 345 bool wxEventLoopImpl::SendIdleEvent()
 346 {
 347     return wxTheApp->ProcessIdle();
 348 }
 349
 350 // ============================================================================
 351 // wxEventLoop implementation
 352 // ============================================================================
 353
 354 // ----------------------------------------------------------------------------
 355 // wxEventLoop running and exiting
 356 // ----------------------------------------------------------------------------
 357
 358 wxEventLoop::~wxEventLoop()
 359 {
 360     wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") );
 361 }
 362
 363 int wxEventLoop::Run()
 364 {
 365     // event loops are not recursive, you need to create another loop!
 366     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
 367
 368     m_impl = new wxEventLoopImpl;
 369
 370     wxEventLoopActivator activate(this);
 371
 372     m_impl->m_keepGoing = true;
 373     while ( m_impl->m_keepGoing )
 374     {
 375         // generate and process idle events for as long as we don't have
 376         // anything else to do
 377         while ( ! Pending() )
 378         {
 379 #if wxUSE_TIMER
 380             wxTimer::NotifyTimers(); // TODO: is this the correct place for it?
 381 #endif
 382             if (!m_impl->SendIdleEvent())
 383             {
 384                 // Break out of while loop
 385                 break;
 386             }
 387         }
 388
 389         // a message came or no more idle processing to do, sit in Dispatch()
 390         // waiting for the next message
 391         if ( !Dispatch() )
 392         {
 393             break;
 394         }
 395     }
 396
 397     OnExit();
 398
 399     int exitcode = m_impl->GetExitCode();
 400     delete m_impl;
 401     m_impl = NULL;
 402
 403     return exitcode;
 404 }
 405
 406 void wxEventLoop::Exit(int rc)
 407 {
 408     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
 409
 410     m_impl->SetExitCode(rc);
 411     m_impl->m_keepGoing = false;
 412 }
 413
 414 // ----------------------------------------------------------------------------
 415 // wxEventLoop message processing dispatching
 416 // ----------------------------------------------------------------------------
 417
 418 bool wxEventLoop::Pending() const
 419 {
 420     XFlush( wxGlobalDisplay() );
 421     return (XPending( wxGlobalDisplay() ) > 0);
 422 }
 423
 424 bool wxEventLoop::Dispatch()
 425 {
 426     XEvent event;
 427
 428     // Start off by checking if any of our child processes have finished.
 429     wxCheckForFinishedChildren();
 430
 431     // TODO allowing for threads, as per e.g. wxMSW
 432
 433     // This now waits until either an X event is received,
 434     // or the select times out. So we should now process
 435     // wxTimers in a reasonably timely fashion. However it
 436     // does also mean that idle processing will happen more
 437     // often, so we should probably limit idle processing to
 438     // not be repeated more than every N milliseconds.
 439
 440     if (XPending( wxGlobalDisplay() ) == 0)
 441     {
 442 #if wxUSE_NANOX
 443         GR_TIMEOUT timeout = 10; // Milliseconds
 444         // Wait for next event, or timeout
 445         GrGetNextEventTimeout(& event, timeout);
 446
 447         // Fall through to ProcessEvent.
 448         // we'll assume that ProcessEvent will just ignore
 449         // the event if there was a timeout and no event.
 450
 451 #else
 452         struct timeval tv;
 453         tv.tv_sec=0;
 454         tv.tv_usec=10000; // TODO make this configurable
 455         int fd = ConnectionNumber( wxGlobalDisplay() );
 456
 457         fd_set readset;
 458         fd_set writeset;
 459         int highest = fd;
 460         wxFD_ZERO(&readset);
 461         wxFD_ZERO(&writeset);
 462
 463         wxFD_SET(fd, &readset);
 464
 465 #if wxUSE_SOCKETS
 466         if (wxTheSocketTable)
 467             wxTheSocketTable->FillSets( &readset, &writeset, &highest );
 468 #endif
 469
 470         if (select( highest+1, &readset, &writeset, NULL, &tv ) == 0)
 471         {
 472             // Timed out, so no event to process
 473             return true;
 474         }
 475         else
 476         {
 477             // An X11 event was pending, so get it
 478             if (wxFD_ISSET( fd, &readset ))
 479                 XNextEvent( wxGlobalDisplay(), &event );
 480
 481 #if wxUSE_SOCKETS
 482             // Check if any socket events were pending,
 483             // and if so, call their callbacks
 484             if (wxTheSocketTable)
 485                 wxTheSocketTable->ProcessEvents( &readset, &writeset );
 486 #endif
 487         }
 488 #endif
 489     }
 490     else
 491     {
 492         XNextEvent( wxGlobalDisplay(), &event );
 493     }
 494
 495
 496     (void) m_impl->ProcessEvent( &event );
 497     return true;
 498 }