src/gtk/app.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        app.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling, Julian Smart
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __VMS
  11 // vms_jackets.h should for proper working be included before anything else
  12 # include <vms_jackets.h>
  13 #undef ConnectionNumber
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #include "wx/app.h"
  20 #include "wx/gdicmn.h"
  21 #include "wx/utils.h"
  22 #include "wx/intl.h"
  23 #include "wx/log.h"
  24 #include "wx/memory.h"
  25 #include "wx/font.h"
  26 #include "wx/settings.h"
  27 #include "wx/dialog.h"
  28 #include "wx/msgdlg.h"
  29 #include "wx/file.h"
  30 #include "wx/filename.h"
  31 #include "wx/module.h"
  32 #include "wx/image.h"
  33 #include "wx/thread.h"
  34
  35 #ifdef __WXGPE__
  36 #include <gpe/init.h>
  37 #endif
  38
  39 #ifdef __WXUNIVERSAL__
  40     #include "wx/univ/theme.h"
  41     #include "wx/univ/renderer.h"
  42 #endif
  43
  44 #if wxUSE_THREADS
  45     #include "wx/thread.h"
  46 #endif
  47
  48 #include <unistd.h>
  49
  50 #ifdef HAVE_POLL
  51     #if defined(__VMS)
  52         #include <poll.h>
  53     #else
  54         // bug in the OpenBSD headers: at least in 3.1 there is no extern "C"
  55         // in neither poll.h nor sys/poll.h which results in link errors later
  56         #ifdef __OPENBSD__
  57             extern "C"
  58             {
  59         #endif
  60
  61         #include <sys/poll.h>
  62
  63         #ifdef __OPENBSD__
  64             };
  65         #endif
  66     #endif // platform
  67 #else // !HAVE_POLL
  68     // we implement poll() ourselves using select() which is supposed exist in
  69     // all modern Unices
  70     #include <sys/types.h>
  71     #include <sys/time.h>
  72     #include <unistd.h>
  73 #endif // HAVE_POLL/!HAVE_POLL
  74
  75 #include "wx/unix/private.h"
  76 #include "wx/gtk/win_gtk.h"
  77 #include "wx/gtk/private.h"
  78
  79 #include <gtk/gtk.h>
  80
  81 //-----------------------------------------------------------------------------
  82 // global data
  83 //-----------------------------------------------------------------------------
  84
  85 bool   g_mainThreadLocked = FALSE;
  86 gint   g_pendingTag = 0;
  87
  88 static GtkWidget *gs_RootWindow = (GtkWidget*) NULL;
  89
  90 //-----------------------------------------------------------------------------
  91 // idle system
  92 //-----------------------------------------------------------------------------
  93
  94 void wxapp_install_idle_handler();
  95
  96 #if wxUSE_THREADS
  97 static wxMutex gs_idleTagsMutex;
  98 #endif
  99
 100 //-----------------------------------------------------------------------------
 101 // wxYield
 102 //-----------------------------------------------------------------------------
 103
 104 // not static because used by textctrl.cpp
 105 //
 106 // MT-FIXME
 107 bool wxIsInsideYield = FALSE;
 108
 109 bool wxApp::Yield(bool onlyIfNeeded)
 110 {
 111     if ( wxIsInsideYield )
 112     {
 113         if ( !onlyIfNeeded )
 114         {
 115             wxFAIL_MSG( wxT("wxYield called recursively" ) );
 116         }
 117
 118         return FALSE;
 119     }
 120
 121 #if wxUSE_THREADS
 122     if ( !wxThread::IsMain() )
 123     {
 124         // can't call gtk_main_iteration() from other threads like this
 125         return TRUE;
 126     }
 127 #endif // wxUSE_THREADS
 128
 129     wxIsInsideYield = TRUE;
 130
 131     // We need to remove idle callbacks or the loop will
 132     // never finish.
 133     wxTheApp->RemoveIdleTag();
 134
 135 #if wxUSE_LOG
 136     // disable log flushing from here because a call to wxYield() shouldn't
 137     // normally result in message boxes popping up &c
 138     wxLog::Suspend();
 139 #endif
 140
 141     while (gtk_events_pending())
 142         gtk_main_iteration();
 143
 144     // It's necessary to call ProcessIdle() to update the frames sizes which
 145     // might have been changed (it also will update other things set from
 146     // OnUpdateUI() which is a nice (and desired) side effect). But we
 147     // call ProcessIdle() only once since this is not meant for longish
 148     // background jobs (controlled by wxIdleEvent::RequestMore() and the
 149     // return value of Processidle().
 150     ProcessIdle();
 151
 152 #if wxUSE_LOG
 153     // let the logs be flashed again
 154     wxLog::Resume();
 155 #endif
 156
 157     wxIsInsideYield = FALSE;
 158
 159     return TRUE;
 160 }
 161
 162 //-----------------------------------------------------------------------------
 163 // wxWakeUpIdle
 164 //-----------------------------------------------------------------------------
 165
 166 // RR/KH: No wxMutexGui calls are needed here according to the GTK faq,
 167 // http://www.gtk.org/faq/#AEN500 - this caused problems for wxPostEvent.
 168
 169 void wxApp::WakeUpIdle()
 170 {
 171     wxapp_install_idle_handler();
 172 }
 173
 174 //-----------------------------------------------------------------------------
 175 // local functions
 176 //-----------------------------------------------------------------------------
 177
 178 // the callback functions must be extern "C" to comply with GTK+ declarations
 179 extern "C"
 180 {
 181
 182 static gint wxapp_pending_callback( gpointer WXUNUSED(data) )
 183 {
 184     if (!wxTheApp) return TRUE;
 185
 186     // When getting called from GDK's time-out handler
 187     // we are no longer within GDK's grab on the GUI
 188     // thread so we must lock it here ourselves.
 189     gdk_threads_enter();
 190
 191     // Sent idle event to all who request them.
 192     wxTheApp->ProcessPendingEvents();
 193
 194     {
 195 #if wxUSE_THREADS
 196         wxMutexLocker lock(gs_idleTagsMutex);
 197 #endif
 198         g_pendingTag = 0;
 199     }
 200
 201     // Flush the logged messages if any.
 202 #if wxUSE_LOG
 203     wxLog::FlushActive();
 204 #endif // wxUSE_LOG
 205
 206     // Release lock again
 207     gdk_threads_leave();
 208
 209     // Return FALSE to indicate that no more idle events are
 210     // to be sent (single shot instead of continuous stream)
 211     return FALSE;
 212 }
 213
 214 static gint wxapp_idle_callback( gpointer WXUNUSED(data) )
 215 {
 216     if (!wxTheApp)
 217         return TRUE;
 218
 219 #ifdef __WXDEBUG__
 220     // don't generate the idle events while the assert modal dialog is shown,
 221     // this completely confuses the apps which don't expect to be reentered
 222     // from some safely-looking functions
 223     if ( wxTheApp->IsInAssert() )
 224     {
 225         // But repaint the assertion message if necessary
 226         if (wxTopLevelWindows.GetCount() > 0)
 227         {
 228             wxWindow* win = (wxWindow*) wxTopLevelWindows.GetLast()->GetData();
 229             if (win->IsKindOf(CLASSINFO(wxMessageDialog)))
 230                 win->OnInternalIdle();
 231         }
 232         return TRUE;
 233     }
 234 #endif // __WXDEBUG__
 235
 236     // When getting called from GDK's time-out handler
 237     // we are no longer within GDK's grab on the GUI
 238     // thread so we must lock it here ourselves.
 239     gdk_threads_enter();
 240
 241     // Indicate that we are now in idle mode and event handlers
 242     // will have to reinstall the idle handler again.
 243     {
 244 #if wxUSE_THREADS
 245         wxMutexLocker lock(gs_idleTagsMutex);
 246 #endif
 247         g_isIdle = TRUE;
 248         wxTheApp->m_idleTag = 0;
 249     }
 250
 251     bool moreIdles;
 252
 253     // Send idle event to all who request them as long as
 254     // no events have popped up in the event queue.
 255     while ( (moreIdles = wxTheApp->ProcessIdle()) && gtk_events_pending() == 0)
 256         ;
 257
 258     // Release lock again
 259     gdk_threads_leave();
 260
 261     // Return FALSE if no more idle events are to be sent
 262     return moreIdles;
 263 }
 264
 265 #if wxUSE_THREADS
 266
 267 #ifdef HAVE_POLL
 268     #define wxPoll poll
 269     #define wxPollFd pollfd
 270 #else // !HAVE_POLL
 271
 272 typedef GPollFD wxPollFd;
 273
 274 int wxPoll(wxPollFd *ufds, unsigned int nfds, int timeout)
 275 {
 276     // convert timeout from ms to struct timeval (s/us)
 277     timeval tv_timeout;
 278     tv_timeout.tv_sec = timeout/1000;
 279     tv_timeout.tv_usec = (timeout%1000)*1000;
 280
 281     // remember the highest fd used here
 282     int fdMax = -1;
 283
 284     // and fill the sets for select()
 285     fd_set readfds;
 286     fd_set writefds;
 287     fd_set exceptfds;
 288     wxFD_ZERO(&readfds);
 289     wxFD_ZERO(&writefds);
 290     wxFD_ZERO(&exceptfds);
 291
 292     unsigned int i;
 293     for ( i = 0; i < nfds; i++ )
 294     {
 295         wxASSERT_MSG( ufds[i].fd < wxFD_SETSIZE, _T("fd out of range") );
 296
 297         if ( ufds[i].events & G_IO_IN )
 298             wxFD_SET(ufds[i].fd, &readfds);
 299
 300         if ( ufds[i].events & G_IO_PRI )
 301             wxFD_SET(ufds[i].fd, &exceptfds);
 302
 303         if ( ufds[i].events & G_IO_OUT )
 304             wxFD_SET(ufds[i].fd, &writefds);
 305
 306         if ( ufds[i].fd > fdMax )
 307             fdMax = ufds[i].fd;
 308     }
 309
 310     fdMax++;
 311     int res = select(fdMax, &readfds, &writefds, &exceptfds, &tv_timeout);
 312
 313     // translate the results back
 314     for ( i = 0; i < nfds; i++ )
 315     {
 316         ufds[i].revents = 0;
 317
 318         if ( wxFD_ISSET(ufds[i].fd, &readfds ) )
 319             ufds[i].revents |= G_IO_IN;
 320
 321         if ( wxFD_ISSET(ufds[i].fd, &exceptfds ) )
 322             ufds[i].revents |= G_IO_PRI;
 323
 324         if ( wxFD_ISSET(ufds[i].fd, &writefds ) )
 325             ufds[i].revents |= G_IO_OUT;
 326     }
 327
 328     return res;
 329 }
 330
 331 #endif // HAVE_POLL/!HAVE_POLL
 332
 333 static gint wxapp_poll_func( GPollFD *ufds, guint nfds, gint timeout )
 334 {
 335     gdk_threads_enter();
 336
 337     wxMutexGuiLeave();
 338     g_mainThreadLocked = TRUE;
 339
 340     // we rely on the fact that glib GPollFD struct is really just pollfd but
 341     // I wonder how wise is this in the long term (VZ)
 342     gint res = wxPoll( (wxPollFd *) ufds, nfds, timeout );
 343
 344     wxMutexGuiEnter();
 345     g_mainThreadLocked = FALSE;
 346
 347     gdk_threads_leave();
 348
 349     return res;
 350 }
 351
 352 #endif // wxUSE_THREADS
 353
 354 } // extern "C"
 355
 356 void wxapp_install_idle_handler()
 357 {
 358 #if wxUSE_THREADS
 359     wxMutexLocker lock(gs_idleTagsMutex);
 360 #endif
 361
 362     // Don't install the handler if it's already installed. This test *MUST*
 363     // be done when gs_idleTagsMutex is locked!
 364     if (!g_isIdle)
 365         return;
 366
 367     // GD: this assert is raised when using the thread sample (which works)
 368     //     so the test is probably not so easy. Can widget callbacks be
 369     //     triggered from child threads and, if so, for which widgets?
 370     // wxASSERT_MSG( wxThread::IsMain() || gs_WakeUpIdle, wxT("attempt to install idle handler from widget callback in child thread (should be exclusively from wxWakeUpIdle)") );
 371
 372     wxASSERT_MSG( wxTheApp->m_idleTag == 0, wxT("attempt to install idle handler twice") );
 373
 374     g_isIdle = FALSE;
 375
 376     if (g_pendingTag == 0)
 377         g_pendingTag = g_idle_add_full( 900, wxapp_pending_callback, NULL, NULL );
 378
 379     // This routine gets called by all event handlers
 380     // indicating that the idle is over. It may also
 381     // get called from other thread for sending events
 382     // to the main thread (and processing these in
 383     // idle time). Very low priority.
 384     wxTheApp->m_idleTag = g_idle_add_full( 1000, wxapp_idle_callback, NULL, NULL );
 385 }
 386
 387 //-----------------------------------------------------------------------------
 388 // Access to the root window global
 389 //-----------------------------------------------------------------------------
 390
 391 GtkWidget* wxGetRootWindow()
 392 {
 393     if (gs_RootWindow == NULL)
 394     {
 395         gs_RootWindow = gtk_window_new( GTK_WINDOW_TOPLEVEL );
 396         gtk_widget_realize( gs_RootWindow );
 397     }
 398     return gs_RootWindow;
 399 }
 400
 401 //-----------------------------------------------------------------------------
 402 // wxApp
 403 //-----------------------------------------------------------------------------
 404
 405 IMPLEMENT_DYNAMIC_CLASS(wxApp,wxEvtHandler)
 406
 407 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
 408     EVT_IDLE(wxAppBase::OnIdle)
 409 END_EVENT_TABLE()
 410
 411 wxApp::wxApp()
 412 {
 413 #ifdef __WXDEBUG__
 414     m_isInAssert = FALSE;
 415 #endif // __WXDEBUG__
 416
 417     m_idleTag = 0;
 418     g_isIdle = TRUE;
 419     wxapp_install_idle_handler();
 420
 421 #if wxUSE_THREADS
 422     g_main_context_set_poll_func( NULL, wxapp_poll_func );
 423 #endif
 424
 425     m_colorCube = (unsigned char*) NULL;
 426
 427     // this is NULL for a "regular" wxApp, but is set (and freed) by a wxGLApp
 428     m_glVisualInfo = (void *) NULL;
 429     m_glFBCInfo = (void *) NULL;
 430 }
 431
 432 wxApp::~wxApp()
 433 {
 434     if (m_idleTag)
 435         g_source_remove( m_idleTag );
 436
 437     if (m_colorCube)
 438         free(m_colorCube);
 439 }
 440
 441 bool wxApp::OnInitGui()
 442 {
 443     if ( !wxAppBase::OnInitGui() )
 444         return FALSE;
 445
 446     GdkVisual *visual = gdk_visual_get_system();
 447
 448     // if this is a wxGLApp (derived from wxApp), and we've already
 449     // chosen a specific visual, then derive the GdkVisual from that
 450     if (m_glVisualInfo != NULL)
 451     {
 452         // seems gtk_widget_set_default_visual no longer exists?
 453         GdkVisual* vis = gtk_widget_get_default_visual();
 454
 455         GdkColormap *colormap = gdk_colormap_new( vis, FALSE );
 456         gtk_widget_set_default_colormap( colormap );
 457
 458         visual = vis;
 459     }
 460
 461     // On some machines, the default visual is just 256 colours, so
 462     // we make sure we get the best. This can sometimes be wasteful.
 463
 464     else
 465     if ((gdk_visual_get_best() != gdk_visual_get_system()) && (m_useBestVisual))
 466     {
 467         /* seems gtk_widget_set_default_visual no longer exists? */
 468         GdkVisual* vis = gtk_widget_get_default_visual();
 469
 470         GdkColormap *colormap = gdk_colormap_new( vis, FALSE );
 471         gtk_widget_set_default_colormap( colormap );
 472
 473         visual = vis;
 474     }
 475
 476     // Nothing to do for 15, 16, 24, 32 bit displays
 477     if (visual->depth > 8) return TRUE;
 478
 479     // initialize color cube for 8-bit color reduction dithering
 480
 481     GdkColormap *cmap = gtk_widget_get_default_colormap();
 482
 483     m_colorCube = (unsigned char*)malloc(32 * 32 * 32);
 484
 485     for (int r = 0; r < 32; r++)
 486     {
 487         for (int g = 0; g < 32; g++)
 488         {
 489             for (int b = 0; b < 32; b++)
 490             {
 491                 int rr = (r << 3) | (r >> 2);
 492                 int gg = (g << 3) | (g >> 2);
 493                 int bb = (b << 3) | (b >> 2);
 494
 495                 int index = -1;
 496
 497                 GdkColor *colors = cmap->colors;
 498                 if (colors)
 499                 {
 500                     int max = 3 * 65536;
 501
 502                     for (int i = 0; i < cmap->size; i++)
 503                     {
 504                         int rdiff = ((rr << 8) - colors[i].red);
 505                         int gdiff = ((gg << 8) - colors[i].green);
 506                         int bdiff = ((bb << 8) - colors[i].blue);
 507                         int sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);
 508                         if (sum < max)
 509                         {
 510                             index = i; max = sum;
 511                         }
 512                     }
 513                 }
 514                 else
 515                 {
 516                     // assume 8-bit true or static colors. this really exists
 517                     GdkVisual* vis = gdk_colormap_get_visual( cmap );
 518                     index = (r >> (5 - vis->red_prec)) << vis->red_shift;
 519                     index |= (g >> (5 - vis->green_prec)) << vis->green_shift;
 520                     index |= (b >> (5 - vis->blue_prec)) << vis->blue_shift;
 521                 }
 522                 m_colorCube[ (r*1024) + (g*32) + b ] = index;
 523             }
 524         }
 525     }
 526
 527     return TRUE;
 528 }
 529
 530 GdkVisual *wxApp::GetGdkVisual()
 531 {
 532     GdkVisual *visual = NULL;
 533
 534     if (m_glVisualInfo)
 535         visual = gdkx_visual_get( ((XVisualInfo *) m_glVisualInfo)->visualid );
 536     else
 537         visual = gdk_window_get_visual( wxGetRootWindow()->window );
 538
 539     wxASSERT( visual );
 540
 541     return visual;
 542 }
 543
 544 bool wxApp::Initialize(int& argc, wxChar **argv)
 545 {
 546     bool init_result;
 547
 548 #if wxUSE_THREADS
 549     // GTK 1.2 up to version 1.2.3 has broken threads
 550     if ((gtk_major_version == 1) &&
 551         (gtk_minor_version == 2) &&
 552         (gtk_micro_version < 4))
 553     {
 554         printf( "wxWidgets warning: GUI threading disabled due to outdated GTK version\n" );
 555     }
 556     else
 557     {
 558         if (!g_thread_supported())
 559             g_thread_init(NULL);
 560     }
 561 #endif // wxUSE_THREADS
 562
 563     gtk_set_locale();
 564
 565     // We should have the wxUSE_WCHAR_T test on the _outside_
 566 #if wxUSE_WCHAR_T
 567     // gtk+ 2.0 supports Unicode through UTF-8 strings
 568     wxConvCurrent = &wxConvUTF8;
 569 #else // !wxUSE_WCHAR_T
 570     if (!wxOKlibc())
 571         wxConvCurrent = (wxMBConv*) NULL;
 572 #endif // wxUSE_WCHAR_T/!wxUSE_WCHAR_T
 573
 574     // decide which conversion to use for the file names
 575
 576     // (1) this variable exists for the sole purpose of specifying the encoding
 577     //     of the filenames for GTK+ programs, so use it if it is set
 578     wxString encName(wxGetenv(_T("G_FILENAME_ENCODING")));
 579     encName = encName.BeforeFirst(_T(','));
 580     if (encName == _T("@locale"))
 581         encName.clear();
 582     encName.MakeUpper();
 583 #if wxUSE_INTL
 584     if (encName.empty())
 585     {
 586         // (2) if a non default locale is set, assume that the user wants his
 587         //     filenames in this locale too
 588         encName = wxLocale::GetSystemEncodingName().Upper();
 589         // (3) finally use UTF-8 by default
 590         if (encName.empty() || encName == _T("US-ASCII"))
 591             encName = _T("UTF-8");
 592         wxSetEnv(_T("G_FILENAME_ENCODING"), encName);
 593     }
 594 #else
 595     if (encName.empty())
 596         encName = _T("UTF-8");
 597 #endif // wxUSE_INTL
 598     static wxConvBrokenFileNames fileconv(encName);
 599     wxConvFileName = &fileconv;
 600
 601 #if wxUSE_UNICODE
 602     // gtk_init() wants UTF-8, not wchar_t, so convert
 603     int i;
 604     char **argvGTK = new char *[argc + 1];
 605     for ( i = 0; i < argc; i++ )
 606     {
 607         argvGTK[i] = wxStrdupA(wxConvUTF8.cWX2MB(argv[i]));
 608     }
 609
 610     argvGTK[argc] = NULL;
 611
 612     int argcGTK = argc;
 613
 614 #ifdef __WXGPE__
 615     init_result = true;  // is there a _check() version of this?
 616     gpe_application_init( &argcGTK, &argvGTK );
 617 #else
 618     init_result = gtk_init_check( &argcGTK, &argvGTK );
 619 #endif
 620
 621     if ( argcGTK != argc )
 622     {
 623         // we have to drop the parameters which were consumed by GTK+
 624         for ( i = 0; i < argcGTK; i++ )
 625         {
 626             while ( strcmp(wxConvUTF8.cWX2MB(argv[i]), argvGTK[i]) != 0 )
 627             {
 628                 memmove(argv + i, argv + i + 1, argc - i);
 629             }
 630         }
 631
 632         argc = argcGTK;
 633     }
 634     //else: gtk_init() didn't modify our parameters
 635
 636     // free our copy
 637     for ( i = 0; i < argcGTK; i++ )
 638     {
 639         free(argvGTK[i]);
 640     }
 641
 642     delete [] argvGTK;
 643 #else // !wxUSE_UNICODE
 644     // gtk_init() shouldn't actually change argv itself (just its contents) so
 645     // it's ok to pass pointer to it
 646     init_result = gtk_init_check( &argc, &argv );
 647 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
 648
 649     if (!init_result) {
 650         wxLogError(wxT("Unable to initialize gtk, is DISPLAY set properly?"));
 651         return false;
 652     }
 653
 654     // we can not enter threads before gtk_init is done
 655     gdk_threads_enter();
 656
 657     if ( !wxAppBase::Initialize(argc, argv) )
 658     {
 659         gdk_threads_leave();
 660
 661         return false;
 662     }
 663
 664     wxSetDetectableAutoRepeat( TRUE );
 665
 666 #if wxUSE_INTL
 667     wxFont::SetDefaultEncoding(wxLocale::GetSystemEncoding());
 668 #endif
 669
 670     return true;
 671 }
 672
 673 void wxApp::CleanUp()
 674 {
 675     gdk_threads_leave();
 676
 677     wxAppBase::CleanUp();
 678 }
 679
 680 #ifdef __WXDEBUG__
 681
 682 void wxApp::OnAssert(const wxChar *file, int line, const wxChar* cond, const wxChar *msg)
 683 {
 684     m_isInAssert = TRUE;
 685
 686     wxAppBase::OnAssert(file, line, cond, msg);
 687
 688     m_isInAssert = FALSE;
 689 }
 690
 691 #endif // __WXDEBUG__
 692
 693 void wxApp::RemoveIdleTag()
 694 {
 695 #if wxUSE_THREADS
 696     wxMutexLocker lock(gs_idleTagsMutex);
 697 #endif
 698     if (!g_isIdle)
 699     {
 700         g_source_remove( wxTheApp->m_idleTag );
 701         wxTheApp->m_idleTag = 0;
 702         g_isIdle = TRUE;
 703     }
 704 }