src/gtk/toplevel.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/toplevel.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 // ============================================================================
  14 // declarations
  15 // ============================================================================
  16
  17 // ----------------------------------------------------------------------------
  18 // headers
  19 // ----------------------------------------------------------------------------
  20
  21 #ifdef __VMS
  22 #define XIconifyWindow XICONIFYWINDOW
  23 #endif
  24
  25 #include "wx/toplevel.h"
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/frame.h"
  29     #include "wx/icon.h"
  30     #include "wx/log.h"
  31     #include "wx/app.h"
  32 #endif
  33
  34 #include "wx/gtk/private.h"
  35 #include "wx/evtloop.h"
  36 #include "wx/sysopt.h"
  37
  38 #include <gtk/gtk.h>
  39 #include <gdk/gdkx.h>
  40
  41 #include "wx/gtk/win_gtk.h"
  42
  43 #include "wx/unix/utilsx11.h"
  44
  45 // XA_CARDINAL
  46 #include <X11/Xatom.h>
  47
  48 // ----------------------------------------------------------------------------
  49 // data
  50 // ----------------------------------------------------------------------------
  51
  52 extern int              g_openDialogs;
  53 extern wxWindowGTK     *g_delayedFocus;
  54
  55 // the frame that is currently active (i.e. its child has focus). It is
  56 // used to generate wxActivateEvents
  57 static wxTopLevelWindowGTK *g_activeFrame = (wxTopLevelWindowGTK*) NULL;
  58 static wxTopLevelWindowGTK *g_lastActiveFrame = (wxTopLevelWindowGTK*) NULL;
  59
  60 // if we detect that the app has got/lost the focus, we set this variable to
  61 // either TRUE or FALSE and an activate event will be sent during the next
  62 // OnIdle() call and it is reset to -1: this value means that we shouldn't
  63 // send any activate events at all
  64 static int g_sendActivateEvent = -1;
  65
  66 //-----------------------------------------------------------------------------
  67 // RequestUserAttention related functions
  68 //-----------------------------------------------------------------------------
  69
  70 extern "C" {
  71 static void wxgtk_window_set_urgency_hint (GtkWindow *win,
  72                                            gboolean setting)
  73 {
  74     wxASSERT_MSG( GTK_WIDGET_REALIZED(win), wxT("wxgtk_window_set_urgency_hint: GdkWindow not realized") );
  75     GdkWindow *window = GTK_WIDGET(win)->window;
  76     XWMHints *wm_hints;
  77
  78     wm_hints = XGetWMHints(GDK_WINDOW_XDISPLAY(window), GDK_WINDOW_XWINDOW(window));
  79
  80     if (!wm_hints)
  81         wm_hints = XAllocWMHints();
  82
  83     if (setting)
  84         wm_hints->flags |= XUrgencyHint;
  85     else
  86         wm_hints->flags &= ~XUrgencyHint;
  87
  88     XSetWMHints(GDK_WINDOW_XDISPLAY(window), GDK_WINDOW_XWINDOW(window), wm_hints);
  89     XFree(wm_hints);
  90 }
  91
  92 static gboolean gtk_frame_urgency_timer_callback( wxTopLevelWindowGTK *win )
  93 {
  94 #if GTK_CHECK_VERSION(2,7,0)
  95     if(!gtk_check_version(2,7,0))
  96         gtk_window_set_urgency_hint(GTK_WINDOW( win->m_widget ), FALSE);
  97     else
  98 #endif
  99         wxgtk_window_set_urgency_hint(GTK_WINDOW( win->m_widget ), FALSE);
 100
 101     win->m_urgency_hint = -2;
 102     return FALSE;
 103 }
 104 }
 105
 106 //-----------------------------------------------------------------------------
 107 // "focus_in_event"
 108 //-----------------------------------------------------------------------------
 109
 110 extern "C" {
 111 static gboolean gtk_frame_focus_in_callback( GtkWidget *widget,
 112                                          GdkEvent *WXUNUSED(event),
 113                                          wxTopLevelWindowGTK *win )
 114 {
 115     switch ( g_sendActivateEvent )
 116     {
 117         case -1:
 118             // we've got focus from outside, synthetize wxActivateEvent
 119             g_sendActivateEvent = 1;
 120             break;
 121
 122         case 0:
 123             // another our window just lost focus, it was already ours before
 124             // - don't send any wxActivateEvent
 125             g_sendActivateEvent = -1;
 126             break;
 127     }
 128
 129     g_activeFrame = win;
 130     g_lastActiveFrame = g_activeFrame;
 131
 132     // wxPrintf( wxT("active: %s\n"), win->GetTitle().c_str() );
 133
 134     // MR: wxRequestUserAttention related block
 135     switch( win->m_urgency_hint )
 136     {
 137         default:
 138             g_source_remove( win->m_urgency_hint );
 139             // no break, fallthrough to remove hint too
 140         case -1:
 141 #if GTK_CHECK_VERSION(2,7,0)
 142             if(!gtk_check_version(2,7,0))
 143                 gtk_window_set_urgency_hint(GTK_WINDOW( widget ), FALSE);
 144             else
 145 #endif
 146             {
 147                 wxgtk_window_set_urgency_hint(GTK_WINDOW( widget ), FALSE);
 148             }
 149
 150             win->m_urgency_hint = -2;
 151             break;
 152
 153         case -2: break;
 154     }
 155
 156     wxLogTrace(wxT("activate"), wxT("Activating frame %p (from focus_in)"), g_activeFrame);
 157     wxActivateEvent event(wxEVT_ACTIVATE, true, g_activeFrame->GetId());
 158     event.SetEventObject(g_activeFrame);
 159     g_activeFrame->GetEventHandler()->ProcessEvent(event);
 160
 161     return FALSE;
 162 }
 163 }
 164
 165 //-----------------------------------------------------------------------------
 166 // "focus_out_event"
 167 //-----------------------------------------------------------------------------
 168
 169 extern "C" {
 170 static
 171 gboolean gtk_frame_focus_out_callback(GtkWidget * WXUNUSED(widget),
 172                                       GdkEventFocus *WXUNUSED(gdk_event),
 173                                       wxTopLevelWindowGTK * WXUNUSED(win))
 174 {
 175     // if the focus goes out of our app alltogether, OnIdle() will send
 176     // wxActivateEvent, otherwise gtk_window_focus_in_callback() will reset
 177     // g_sendActivateEvent to -1
 178     g_sendActivateEvent = 0;
 179
 180     // wxASSERT_MSG( (g_activeFrame == win), wxT("TLW deactivatd although it wasn't active") );
 181
 182     // wxPrintf( wxT("inactive: %s\n"), win->GetTitle().c_str() );
 183
 184     if (g_activeFrame)
 185     {
 186         wxLogTrace(wxT("activate"), wxT("Activating frame %p (from focus_in)"), g_activeFrame);
 187         wxActivateEvent event(wxEVT_ACTIVATE, false, g_activeFrame->GetId());
 188         event.SetEventObject(g_activeFrame);
 189         g_activeFrame->GetEventHandler()->ProcessEvent(event);
 190
 191         g_activeFrame = NULL;
 192     }
 193
 194     return FALSE;
 195 }
 196 }
 197
 198 //-----------------------------------------------------------------------------
 199
 200 // Get cached size of WM decorations for given GdkWMDecoration.
 201 static wxSize& GetDecorSize(int decor)
 202 {
 203     // In testing, only the title bar and GDK_DECOR_BORDER made a difference.
 204     // 4 possible combinations of title bar and border
 205     static wxSize size[4];
 206
 207     int index = 0;
 208     // title bar
 209     if (decor & (GDK_DECOR_MENU | GDK_DECOR_MINIMIZE | GDK_DECOR_MAXIMIZE | GDK_DECOR_TITLE))
 210         index = 1;
 211     // border
 212     if (decor & GDK_DECOR_BORDER)
 213         index |= 2;
 214     return size[index];
 215 }
 216
 217 //-----------------------------------------------------------------------------
 218 // "size_allocate" from m_wxwindow
 219 //-----------------------------------------------------------------------------
 220
 221 extern "C" {
 222 static void
 223 size_allocate(GtkWidget*, GtkAllocation* alloc, wxTopLevelWindowGTK* win)
 224 {
 225     if (win->m_oldClientWidth  != alloc->width ||
 226         win->m_oldClientHeight != alloc->height)
 227     {
 228         win->m_oldClientWidth  = alloc->width;
 229         win->m_oldClientHeight = alloc->height;
 230         wxSize sizeDecor;
 231         if (!win->IsFullScreen())
 232             sizeDecor = GetDecorSize(win->m_gdkDecor);
 233         win->m_width  = win->m_widget->allocation.width  + sizeDecor.x;
 234         win->m_height = win->m_widget->allocation.height + sizeDecor.y;
 235         if (!win->IsIconized())
 236         {
 237             wxSizeEvent event(win->GetSize(), win->GetId());
 238             event.SetEventObject(win);
 239             win->GetEventHandler()->ProcessEvent(event);
 240         }
 241         // else the window is currently unmapped, don't generate size events
 242     }
 243 }
 244 }
 245
 246 // ----------------------------------------------------------------------------
 247 // "size_request"
 248 // ----------------------------------------------------------------------------
 249
 250 extern "C" {
 251 static
 252 void wxgtk_tlw_size_request_callback(GtkWidget * WXUNUSED(widget),
 253                                      GtkRequisition *requisition,
 254                                      wxTopLevelWindowGTK *win)
 255 {
 256     // we must return the size of the window without WM decorations, otherwise
 257     // GTK+ gets confused, so don't call just GetSize() here
 258     win->GTKDoGetSize(&requisition->width, &requisition->height);
 259 }
 260 }
 261
 262 //-----------------------------------------------------------------------------
 263 // "delete_event"
 264 //-----------------------------------------------------------------------------
 265
 266 extern "C" {
 267 static gboolean
 268 gtk_frame_delete_callback( GtkWidget *WXUNUSED(widget),
 269                            GdkEvent *WXUNUSED(event),
 270                            wxTopLevelWindowGTK *win )
 271 {
 272     if (win->IsEnabled() &&
 273         (g_openDialogs == 0 || (win->GetExtraStyle() & wxTOPLEVEL_EX_DIALOG) ||
 274          win->IsGrabbed()))
 275         win->Close();
 276
 277     return TRUE;
 278 }
 279 }
 280
 281
 282 //-----------------------------------------------------------------------------
 283 // "configure_event"
 284 //-----------------------------------------------------------------------------
 285
 286 extern "C" {
 287 static gboolean
 288 gtk_frame_configure_callback( GtkWidget* widget,
 289                               GdkEventConfigure *WXUNUSED(event),
 290                               wxTopLevelWindowGTK *win )
 291 {
 292     if (!win->m_hasVMT || !win->IsShown())
 293         return FALSE;
 294
 295     wxPoint point;
 296     gtk_window_get_position((GtkWindow*)widget, &point.x, &point.y);
 297
 298     win->m_x = point.x;
 299     win->m_y = point.y;
 300     wxMoveEvent mevent(point, win->GetId());
 301     mevent.SetEventObject( win );
 302     win->GetEventHandler()->ProcessEvent( mevent );
 303
 304     return FALSE;
 305 }
 306 }
 307
 308 //-----------------------------------------------------------------------------
 309 // "realize" from m_widget
 310 //-----------------------------------------------------------------------------
 311
 312 // we cannot MWM hints and icons before the widget has been realized,
 313 // so we do this directly after realization
 314
 315 extern "C" {
 316 static void
 317 gtk_frame_realized_callback( GtkWidget * WXUNUSED(widget),
 318                              wxTopLevelWindowGTK *win )
 319 {
 320     // All this is for Motif Window Manager "hints" and is supposed to be
 321     // recognized by other WM as well. Not tested.
 322     gdk_window_set_decorations(win->m_widget->window,
 323                                (GdkWMDecoration)win->m_gdkDecor);
 324     gdk_window_set_functions(win->m_widget->window,
 325                                (GdkWMFunction)win->m_gdkFunc);
 326
 327     // GTK's shrinking/growing policy
 328     if ((win->m_gdkFunc & GDK_FUNC_RESIZE) == 0)
 329         gtk_window_set_resizable(GTK_WINDOW(win->m_widget), FALSE);
 330     else
 331         gtk_window_set_policy(GTK_WINDOW(win->m_widget), 1, 1, 1);
 332
 333     // reset the icon
 334     wxIconBundle iconsOld = win->GetIcons();
 335     if ( !iconsOld.IsEmpty() )
 336     {
 337         win->SetIcon( wxNullIcon );
 338         win->SetIcons( iconsOld );
 339     }
 340 }
 341 }
 342
 343 //-----------------------------------------------------------------------------
 344 // "map_event" from m_widget
 345 //-----------------------------------------------------------------------------
 346
 347 extern "C" {
 348 static gboolean
 349 gtk_frame_map_callback( GtkWidget* widget,
 350                         GdkEvent * WXUNUSED(event),
 351                         wxTopLevelWindow *win )
 352 {
 353     // Calculate size of WM decorations.
 354     // Done here in case WM does not support the _NET_FRAME_EXTENTS property.
 355     if (win->IsDecorCacheable() && !win->IsFullScreen())
 356     {
 357         GdkRectangle rect;
 358         gdk_window_get_frame_extents(widget->window, &rect);
 359         int w, h;
 360         gdk_drawable_get_size(widget->window, &w, &h);
 361         wxSize& decorSize = GetDecorSize(win->m_gdkDecor);
 362         const wxSize size = wxSize(rect.width - w, rect.height - h);
 363         if (decorSize.x != size.x || decorSize.y != size.y)
 364         {
 365             // Update window size and frame extents cache
 366             win->m_width = rect.width;
 367             win->m_height = rect.height;
 368             decorSize = size;
 369             wxSizeEvent event(win->GetSize(), win->GetId());
 370             event.SetEventObject(win);
 371             win->GetEventHandler()->ProcessEvent(event);
 372         }
 373     }
 374
 375     win->SetIconizeState(false);
 376     return false;
 377 }
 378 }
 379
 380 //-----------------------------------------------------------------------------
 381 // "unmap_event" from m_widget
 382 //-----------------------------------------------------------------------------
 383
 384 extern "C" {
 385 static gboolean
 386 gtk_frame_unmap_callback( GtkWidget * WXUNUSED(widget),
 387                           GdkEvent * WXUNUSED(event),
 388                           wxTopLevelWindow *win )
 389 {
 390     win->SetIconizeState(true);
 391     return false;
 392 }
 393 }
 394
 395 //-----------------------------------------------------------------------------
 396 // "property_notify_event" from m_widget
 397 //-----------------------------------------------------------------------------
 398
 399 extern "C" {
 400 static gboolean property_notify_event(
 401     GtkWidget*, GdkEventProperty* event, wxTopLevelWindowGTK* win)
 402 {
 403     // Watch for changes to _NET_FRAME_EXTENTS property
 404     static GdkAtom property = gdk_atom_intern("_NET_FRAME_EXTENTS", false);
 405     if (event->state == GDK_PROPERTY_NEW_VALUE && event->atom == property &&
 406         win->IsDecorCacheable() && !win->IsFullScreen())
 407     {
 408         Atom xproperty;
 409 #if GTK_CHECK_VERSION(2, 2, 0)
 410         if (gtk_check_version(2, 2, 0) == NULL)
 411         {
 412             xproperty = gdk_x11_atom_to_xatom_for_display(
 413                 gdk_drawable_get_display(event->window), property);
 414         }
 415         else
 416 #endif
 417         {
 418             xproperty = gdk_x11_atom_to_xatom(property);
 419         }
 420         Atom type;
 421         int format;
 422         gulong nitems, bytes_after;
 423         long* data = NULL;
 424         Status status = XGetWindowProperty(
 425             gdk_x11_drawable_get_xdisplay(event->window),
 426             gdk_x11_drawable_get_xid(event->window),
 427             xproperty,
 428             0, 4, false, XA_CARDINAL,
 429             &type, &format, &nitems, &bytes_after, (guchar**)&data);
 430         if (status == Success && data && nitems == 4)
 431         {
 432             wxSize& decorSize = GetDecorSize(win->m_gdkDecor);
 433             const wxSize size =
 434                 wxSize(int(data[0] + data[1]), int(data[2] + data[3]));
 435             if (decorSize.x != size.x || decorSize.y != size.y)
 436             {
 437                 // Update window size and frame extents cache
 438                 win->m_width  += size.x - decorSize.x;
 439                 win->m_height += size.y - decorSize.y;
 440                 if (win->m_width  < 0) win->m_width  = 0;
 441                 if (win->m_height < 0) win->m_height = 0;
 442                 decorSize = size;
 443                 wxSizeEvent event(win->GetSize(), win->GetId());
 444                 event.SetEventObject(win);
 445                 win->GetEventHandler()->ProcessEvent(event);
 446             }
 447         }
 448         if (data)
 449             XFree(data);
 450     }
 451     return false;
 452 }
 453 }
 454
 455 // ----------------------------------------------------------------------------
 456 // wxTopLevelWindowGTK creation
 457 // ----------------------------------------------------------------------------
 458
 459 void wxTopLevelWindowGTK::Init()
 460 {
 461     m_mainWidget = (GtkWidget*) NULL;
 462     m_isIconized = false;
 463     m_fsIsShowing = false;
 464     m_themeEnabled = true;
 465     m_gdkDecor = m_gdkFunc = 0;
 466     m_grabbed = false;
 467
 468     m_urgency_hint = -2;
 469 }
 470
 471 bool wxTopLevelWindowGTK::Create( wxWindow *parent,
 472                                   wxWindowID id,
 473                                   const wxString& title,
 474                                   const wxPoint& pos,
 475                                   const wxSize& sizeOrig,
 476                                   long style,
 477                                   const wxString &name )
 478 {
 479     // always create a frame of some reasonable, even if arbitrary, size (at
 480     // least for MSW compatibility)
 481     wxSize size = sizeOrig;
 482     size.x = WidthDefault(size.x);
 483     size.y = HeightDefault(size.y);
 484
 485     wxTopLevelWindows.Append( this );
 486
 487     if (!PreCreation( parent, pos, size ) ||
 488         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 489     {
 490         wxFAIL_MSG( wxT("wxTopLevelWindowGTK creation failed") );
 491         return false;
 492     }
 493
 494     m_title = title;
 495
 496     // NB: m_widget may be !=NULL if it was created by derived class' Create,
 497     //     e.g. in wxTaskBarIconAreaGTK
 498     if (m_widget == NULL)
 499     {
 500         m_widget = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 501         if (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)
 502         {
 503             // Tell WM that this is a dialog window and make it center
 504             // on parent by default (this is what GtkDialog ctor does):
 505             gtk_window_set_type_hint(GTK_WINDOW(m_widget),
 506                                      GDK_WINDOW_TYPE_HINT_DIALOG);
 507             gtk_window_set_position(GTK_WINDOW(m_widget),
 508                                     GTK_WIN_POS_CENTER_ON_PARENT);
 509         }
 510         else
 511         {
 512 #if GTK_CHECK_VERSION(2,1,0)
 513             if (!gtk_check_version(2,1,0))
 514             {
 515                 if (style & wxFRAME_TOOL_WINDOW)
 516                 {
 517                     gtk_window_set_type_hint(GTK_WINDOW(m_widget),
 518                                              GDK_WINDOW_TYPE_HINT_UTILITY);
 519
 520                     // On some WMs, like KDE, a TOOL_WINDOW will still show
 521                     // on the taskbar, but on Gnome a TOOL_WINDOW will not.
 522                     // For consistency between WMs and with Windows, we
 523                     // should set the NO_TASKBAR flag which will apply
 524                     // the set_skip_taskbar_hint if it is available,
 525                     // ensuring no taskbar entry will appear.
 526                     style |= wxFRAME_NO_TASKBAR;
 527                 }
 528             }
 529 #endif
 530         }
 531     }
 532
 533     wxWindow *topParent = wxGetTopLevelParent(m_parent);
 534     if (topParent && (((GTK_IS_WINDOW(topParent->m_widget)) &&
 535                        (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG)) ||
 536                        (style & wxFRAME_FLOAT_ON_PARENT)))
 537     {
 538         gtk_window_set_transient_for( GTK_WINDOW(m_widget),
 539                                       GTK_WINDOW(topParent->m_widget) );
 540     }
 541
 542 #if GTK_CHECK_VERSION(2,2,0)
 543     if (!gtk_check_version(2,2,0))
 544     {
 545         if (style & wxFRAME_NO_TASKBAR)
 546         {
 547             gtk_window_set_skip_taskbar_hint(GTK_WINDOW(m_widget), TRUE);
 548         }
 549     }
 550 #endif
 551
 552 #ifdef __WXGTK24__
 553     if (!gtk_check_version(2,4,0))
 554     {
 555         if (style & wxSTAY_ON_TOP)
 556         {
 557             gtk_window_set_keep_above(GTK_WINDOW(m_widget), TRUE);
 558         }
 559     }
 560 #endif
 561
 562 #if 0
 563     if (!name.empty())
 564         gtk_window_set_role( GTK_WINDOW(m_widget), wxGTK_CONV( name ) );
 565 #endif
 566
 567     gtk_window_set_title( GTK_WINDOW(m_widget), wxGTK_CONV( title ) );
 568     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 569
 570     g_signal_connect (m_widget, "delete_event",
 571                       G_CALLBACK (gtk_frame_delete_callback), this);
 572
 573     // m_mainWidget is a GtkVBox, holding the bars and client area (m_wxwindow)
 574     m_mainWidget = gtk_vbox_new(false, 0);
 575     gtk_widget_show( m_mainWidget );
 576     GTK_WIDGET_UNSET_FLAGS( m_mainWidget, GTK_CAN_FOCUS );
 577     gtk_container_add( GTK_CONTAINER(m_widget), m_mainWidget );
 578
 579     // m_wxwindow is the client area
 580     m_wxwindow = gtk_pizza_new_no_scroll();
 581     gtk_widget_show( m_wxwindow );
 582     gtk_container_add( GTK_CONTAINER(m_mainWidget), m_wxwindow );
 583
 584     // we donm't allow the frame to get the focus as otherwise
 585     // the frame will grab it at arbitrary focus changes
 586     GTK_WIDGET_UNSET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 587
 588     if (m_parent) m_parent->AddChild( this );
 589
 590     g_signal_connect(m_wxwindow, "size_allocate",
 591         G_CALLBACK(size_allocate), this);
 592
 593     g_signal_connect (m_widget, "size_request",
 594                       G_CALLBACK (wxgtk_tlw_size_request_callback), this);
 595     PostCreation();
 596
 597     if ((m_x != -1) || (m_y != -1))
 598         gtk_widget_set_uposition( m_widget, m_x, m_y );
 599
 600     //  we cannot set MWM hints and icons before the widget has
 601     //  been realized, so we do this directly after realization
 602     g_signal_connect (m_widget, "realize",
 603                       G_CALLBACK (gtk_frame_realized_callback), this);
 604
 605     // map and unmap for iconized state
 606     g_signal_connect (m_widget, "map_event",
 607                       G_CALLBACK (gtk_frame_map_callback), this);
 608     g_signal_connect (m_widget, "unmap_event",
 609                       G_CALLBACK (gtk_frame_unmap_callback), this);
 610
 611     // for wxMoveEvent
 612     g_signal_connect (m_widget, "configure_event",
 613                       G_CALLBACK (gtk_frame_configure_callback), this);
 614
 615     // activation
 616     g_signal_connect_after (m_widget, "focus_in_event",
 617                       G_CALLBACK (gtk_frame_focus_in_callback), this);
 618     g_signal_connect_after (m_widget, "focus_out_event",
 619                       G_CALLBACK (gtk_frame_focus_out_callback), this);
 620
 621     gtk_widget_add_events(m_widget, GDK_PROPERTY_CHANGE_MASK);
 622     g_signal_connect(m_widget, "property_notify_event",
 623         G_CALLBACK(property_notify_event), this);
 624
 625     // decorations
 626     if ((style & wxSIMPLE_BORDER) || (style & wxNO_BORDER))
 627     {
 628         m_gdkDecor = 0;
 629         m_gdkFunc = 0;
 630     }
 631     else
 632     {
 633         m_gdkDecor = GDK_DECOR_BORDER;
 634         m_gdkFunc = GDK_FUNC_MOVE;
 635
 636         // All this is for Motif Window Manager "hints" and is supposed to be
 637         // recognized by other WMs as well.
 638         if ((style & wxCAPTION) != 0)
 639         {
 640             m_gdkDecor |= GDK_DECOR_TITLE;
 641         }
 642         if ((style & wxCLOSE_BOX) != 0)
 643         {
 644             m_gdkFunc |= GDK_FUNC_CLOSE;
 645         }
 646         if ((style & wxSYSTEM_MENU) != 0)
 647         {
 648             m_gdkDecor |= GDK_DECOR_MENU;
 649         }
 650         if ((style & wxMINIMIZE_BOX) != 0)
 651         {
 652             m_gdkFunc |= GDK_FUNC_MINIMIZE;
 653             m_gdkDecor |= GDK_DECOR_MINIMIZE;
 654         }
 655         if ((style & wxMAXIMIZE_BOX) != 0)
 656         {
 657             m_gdkFunc |= GDK_FUNC_MAXIMIZE;
 658             m_gdkDecor |= GDK_DECOR_MAXIMIZE;
 659         }
 660         if ((style & wxRESIZE_BORDER) != 0)
 661         {
 662            m_gdkFunc |= GDK_FUNC_RESIZE;
 663            m_gdkDecor |= GDK_DECOR_RESIZEH;
 664         }
 665     }
 666
 667     // m_gdkDecor needs to be set before calling GTKDoGetSize
 668     int w, h;
 669     GTKDoGetSize(&w, &h);
 670     gtk_window_set_default_size(GTK_WINDOW(m_widget), w, h);
 671
 672     return true;
 673 }
 674
 675 wxTopLevelWindowGTK::~wxTopLevelWindowGTK()
 676 {
 677     if (m_grabbed)
 678     {
 679         wxFAIL_MSG(_T("Window still grabbed"));
 680         RemoveGrab();
 681     }
 682
 683     m_isBeingDeleted = true;
 684
 685     // it may also be GtkScrolledWindow in the case of an MDI child
 686     if (GTK_IS_WINDOW(m_widget))
 687     {
 688         gtk_window_set_focus( GTK_WINDOW(m_widget), NULL );
 689     }
 690
 691     if (g_activeFrame == this)
 692         g_activeFrame = NULL;
 693     if (g_lastActiveFrame == this)
 694         g_lastActiveFrame = NULL;
 695 }
 696
 697 bool wxTopLevelWindowGTK::EnableCloseButton( bool enable )
 698 {
 699     if (enable)
 700         m_gdkFunc |= GDK_FUNC_CLOSE;
 701     else
 702         m_gdkFunc &= ~GDK_FUNC_CLOSE;
 703
 704     if (GTK_WIDGET_REALIZED(m_widget) && (m_widget->window))
 705         gdk_window_set_functions( m_widget->window, (GdkWMFunction)m_gdkFunc );
 706
 707     return true;
 708 }
 709
 710 bool wxTopLevelWindowGTK::ShowFullScreen(bool show, long)
 711 {
 712     if (show == m_fsIsShowing)
 713         return false; // return what?
 714
 715     m_fsIsShowing = show;
 716
 717     wxX11FullScreenMethod method =
 718         wxGetFullScreenMethodX11((WXDisplay*)GDK_DISPLAY(),
 719                                  (WXWindow)GDK_ROOT_WINDOW());
 720
 721 #if GTK_CHECK_VERSION(2,2,0)
 722     // NB: gtk_window_fullscreen() uses freedesktop.org's WMspec extensions
 723     //     to switch to fullscreen, which is not always available. We must
 724     //     check if WM supports the spec and use legacy methods if it
 725     //     doesn't.
 726     if ( (method == wxX11_FS_WMSPEC) && !gtk_check_version(2,2,0) )
 727     {
 728         if (show)
 729             gtk_window_fullscreen( GTK_WINDOW( m_widget ) );
 730         else
 731             gtk_window_unfullscreen( GTK_WINDOW( m_widget ) );
 732     }
 733     else
 734 #endif // GTK+ >= 2.2.0
 735     {
 736         GdkWindow *window = m_widget->window;
 737
 738         if (show)
 739         {
 740             GetPosition( &m_fsSaveFrame.x, &m_fsSaveFrame.y );
 741             GetSize( &m_fsSaveFrame.width, &m_fsSaveFrame.height );
 742
 743             int screen_width,screen_height;
 744             wxDisplaySize( &screen_width, &screen_height );
 745
 746             gint client_x, client_y, root_x, root_y;
 747             gint width, height;
 748
 749             if (method != wxX11_FS_WMSPEC)
 750             {
 751                 // don't do it always, Metacity hates it
 752                 m_fsSaveGdkFunc = m_gdkFunc;
 753                 m_fsSaveGdkDecor = m_gdkDecor;
 754                 m_gdkFunc = m_gdkDecor = 0;
 755                 gdk_window_set_decorations(window, (GdkWMDecoration)0);
 756                 gdk_window_set_functions(window, (GdkWMFunction)0);
 757             }
 758
 759             gdk_window_get_origin (m_widget->window, &root_x, &root_y);
 760             gdk_window_get_geometry (m_widget->window, &client_x, &client_y,
 761                          &width, &height, NULL);
 762
 763             gdk_window_move_resize (m_widget->window, -client_x, -client_y,
 764                         screen_width + 1, screen_height + 1);
 765
 766             wxSetFullScreenStateX11((WXDisplay*)GDK_DISPLAY(),
 767                                     (WXWindow)GDK_ROOT_WINDOW(),
 768                                     (WXWindow)GDK_WINDOW_XWINDOW(window),
 769                                     show, &m_fsSaveFrame, method);
 770         }
 771         else // hide
 772         {
 773             if (method != wxX11_FS_WMSPEC)
 774             {
 775                 // don't do it always, Metacity hates it
 776                 m_gdkFunc = m_fsSaveGdkFunc;
 777                 m_gdkDecor = m_fsSaveGdkDecor;
 778                 gdk_window_set_decorations(window, (GdkWMDecoration)m_gdkDecor);
 779                 gdk_window_set_functions(window, (GdkWMFunction)m_gdkFunc);
 780             }
 781
 782             wxSetFullScreenStateX11((WXDisplay*)GDK_DISPLAY(),
 783                                     (WXWindow)GDK_ROOT_WINDOW(),
 784                                     (WXWindow)GDK_WINDOW_XWINDOW(window),
 785                                     show, &m_fsSaveFrame, method);
 786
 787             SetSize(m_fsSaveFrame.x, m_fsSaveFrame.y,
 788                     m_fsSaveFrame.width, m_fsSaveFrame.height);
 789         }
 790     }
 791
 792     // documented behaviour is to show the window if it's still hidden when
 793     // showing it full screen
 794     if (show)
 795         Show();
 796
 797     return true;
 798 }
 799
 800 // ----------------------------------------------------------------------------
 801 // overridden wxWindow methods
 802 // ----------------------------------------------------------------------------
 803
 804 bool wxTopLevelWindowGTK::Show( bool show )
 805 {
 806     wxASSERT_MSG( (m_widget != NULL), wxT("invalid frame") );
 807
 808     if (show && !IsShown())
 809     {
 810         // size_allocate signals occur in reverse order (bottom to top).
 811         // Things work better if the initial wxSizeEvents are sent (from the
 812         // top down), before the initial size_allocate signals occur.
 813         wxSizeEvent event(GetSize(), GetId());
 814         event.SetEventObject(this);
 815         GetEventHandler()->ProcessEvent(event);
 816     }
 817
 818     bool change = wxTopLevelWindowBase::Show(show);
 819
 820     if (change && !show)
 821     {
 822         // make sure window has a non-default position, so when it is shown
 823         // again, it won't be repositioned by WM as if it were a new window
 824         // Note that this must be done _after_ the window is hidden.
 825         gtk_window_move((GtkWindow*)m_widget, m_x, m_y);
 826     }
 827
 828     return change;
 829 }
 830
 831 void wxTopLevelWindowGTK::Raise()
 832 {
 833     gtk_window_present( GTK_WINDOW( m_widget ) );
 834 }
 835
 836 void wxTopLevelWindowGTK::DoMoveWindow(int WXUNUSED(x), int WXUNUSED(y), int WXUNUSED(width), int WXUNUSED(height) )
 837 {
 838     wxFAIL_MSG( wxT("DoMoveWindow called for wxTopLevelWindowGTK") );
 839 }
 840
 841 // ----------------------------------------------------------------------------
 842 // window geometry
 843 // ----------------------------------------------------------------------------
 844
 845 void wxTopLevelWindowGTK::GTKDoGetSize(int *width, int *height) const
 846 {
 847     wxSize size(m_width, m_height);
 848     if (!IsFullScreen())
 849     {
 850         size -= GetDecorSize(m_gdkDecor);
 851         if (size.x < 0) size.x = 0;
 852         if (size.y < 0) size.y = 0;
 853     }
 854     if (width)  *width  = size.x;
 855     if (height) *height = size.y;
 856 }
 857
 858 void wxTopLevelWindowGTK::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 859 {
 860     wxCHECK_RET( m_widget, wxT("invalid frame") );
 861
 862     // this shouldn't happen: wxFrame, wxMDIParentFrame and wxMDIChildFrame have m_wxwindow
 863     wxASSERT_MSG( (m_wxwindow != NULL), wxT("invalid frame") );
 864
 865
 866     // deal with the position first
 867     int old_x = m_x;
 868     int old_y = m_y;
 869
 870     if ( !(sizeFlags & wxSIZE_ALLOW_MINUS_ONE) )
 871     {
 872         // -1 means "use existing" unless the flag above is specified
 873         if ( x != -1 )
 874             m_x = x;
 875         if ( y != -1 )
 876             m_y = y;
 877     }
 878     else // wxSIZE_ALLOW_MINUS_ONE
 879     {
 880         m_x = x;
 881         m_y = y;
 882     }
 883
 884     if ( m_x != old_x || m_y != old_y )
 885     {
 886         gtk_window_move( GTK_WINDOW(m_widget), m_x, m_y );
 887     }
 888
 889     const wxSize oldSize(m_width, m_height);
 890     if (width >= 0)
 891         m_width = width;
 892     if (height >= 0)
 893         m_height = height;
 894     ConstrainSize();
 895     if (m_width != oldSize.x || m_height != oldSize.y)
 896     {
 897         int w, h;
 898         GTKDoGetSize(&w, &h);
 899         gtk_window_resize(GTK_WINDOW(m_widget), w, h);
 900
 901         GetClientSize(&m_oldClientWidth, &m_oldClientHeight);
 902         wxSizeEvent event(GetSize(), GetId());
 903         event.SetEventObject(this);
 904         GetEventHandler()->ProcessEvent(event);
 905     }
 906 }
 907
 908 void wxTopLevelWindowGTK::DoGetClientSize( int *width, int *height ) const
 909 {
 910     wxASSERT_MSG(m_widget, wxT("invalid frame"));
 911
 912     if ( IsIconized() )
 913     {
 914         // for consistency with wxMSW, client area is supposed to be empty for
 915         // the iconized windows
 916         if ( width )
 917             *width = 0;
 918         if ( height )
 919             *height = 0;
 920     }
 921     else
 922     {
 923         GTKDoGetSize(width, height);
 924     }
 925 }
 926
 927 void wxTopLevelWindowGTK::DoSetSizeHints( int minW, int minH,
 928                                           int maxW, int maxH,
 929                                           int incW, int incH )
 930 {
 931     wxTopLevelWindowBase::DoSetSizeHints( minW, minH, maxW, maxH, incW, incH );
 932
 933     const wxSize minSize = GetMinSize();
 934     const wxSize maxSize = GetMaxSize();
 935     GdkGeometry hints;
 936     int hints_mask = 0;
 937     const wxSize sizeDecor = GetDecorSize(m_gdkDecor);
 938     if (minSize.x > 0 || minSize.y > 0)
 939     {
 940         hints_mask |= GDK_HINT_MIN_SIZE;
 941         hints.min_width = minSize.x - sizeDecor.x;
 942         if (hints.min_width < 0)
 943             hints.min_width = 0;
 944         hints.min_height = minSize.y - sizeDecor.y;
 945         if (hints.min_height < 0)
 946             hints.min_height = 0;
 947     }
 948     if (maxSize.x > 0 || maxSize.y > 0)
 949     {
 950         hints_mask |= GDK_HINT_MAX_SIZE;
 951         hints.max_width = maxSize.x - sizeDecor.x;
 952         if (hints.max_width < 0)
 953             hints.max_width = INT_MAX;
 954         hints.max_height = maxSize.y - sizeDecor.y;
 955         if (hints.max_height < 0)
 956             hints.max_height = INT_MAX;
 957     }
 958     if (incW > 0 || incH > 0)
 959     {
 960         hints_mask |= GDK_HINT_RESIZE_INC;
 961         hints.width_inc  = incW > 0 ? incW : 1;
 962         hints.height_inc = incH > 0 ? incH : 1;
 963     }
 964     gtk_window_set_geometry_hints(
 965         (GtkWindow*)m_widget, NULL, &hints, (GdkWindowHints)hints_mask);
 966 }
 967
 968 bool wxTopLevelWindowGTK::IsDecorCacheable() const
 969 {
 970     return true;
 971 }
 972
 973 void wxTopLevelWindowGTK::OnInternalIdle()
 974 {
 975     // set the focus if not done yet and if we can already do it
 976     if ( GTK_WIDGET_REALIZED(m_wxwindow) )
 977     {
 978         if ( g_delayedFocus &&
 979              wxGetTopLevelParent((wxWindow*)g_delayedFocus) == this )
 980         {
 981             wxLogTrace(_T("focus"),
 982                        _T("Setting focus from wxTLW::OnIdle() to %s(%s)"),
 983                        g_delayedFocus->GetClassInfo()->GetClassName(),
 984                        g_delayedFocus->GetLabel().c_str());
 985
 986             g_delayedFocus->SetFocus();
 987             g_delayedFocus = NULL;
 988         }
 989     }
 990
 991     wxWindow::OnInternalIdle();
 992
 993     // Synthetize activate events.
 994     if ( g_sendActivateEvent != -1 )
 995     {
 996         bool activate = g_sendActivateEvent != 0;
 997
 998         // if (!activate) wxPrintf( wxT("de") );
 999         // wxPrintf( wxT("activate\n") );
1000
1001         // do it only once
1002         g_sendActivateEvent = -1;
1003
1004         wxTheApp->SetActive(activate, (wxWindow *)g_lastActiveFrame);
1005     }
1006 }
1007
1008 // ----------------------------------------------------------------------------
1009 // frame title/icon
1010 // ----------------------------------------------------------------------------
1011
1012 void wxTopLevelWindowGTK::SetTitle( const wxString &title )
1013 {
1014     wxASSERT_MSG( (m_widget != NULL), wxT("invalid frame") );
1015
1016     if ( title == m_title )
1017         return;
1018
1019     m_title = title;
1020
1021     gtk_window_set_title( GTK_WINDOW(m_widget), wxGTK_CONV( title ) );
1022 }
1023
1024 void wxTopLevelWindowGTK::SetIcons( const wxIconBundle &icons )
1025 {
1026     wxASSERT_MSG( (m_widget != NULL), wxT("invalid frame") );
1027
1028     wxTopLevelWindowBase::SetIcons( icons );
1029
1030     GList *list = NULL;
1031
1032     const size_t numIcons = icons.GetIconCount();
1033     for ( size_t i = 0; i < numIcons; i++ )
1034     {
1035         list = g_list_prepend(list, icons.GetIconByIndex(i).GetPixbuf());
1036     }
1037
1038     gtk_window_set_icon_list(GTK_WINDOW(m_widget), list);
1039     g_list_free(list);
1040 }
1041
1042 // ----------------------------------------------------------------------------
1043 // frame state: maximized/iconized/normal
1044 // ----------------------------------------------------------------------------
1045
1046 void wxTopLevelWindowGTK::Maximize(bool maximize)
1047 {
1048     if (maximize)
1049         gtk_window_maximize( GTK_WINDOW( m_widget ) );
1050     else
1051         gtk_window_unmaximize( GTK_WINDOW( m_widget ) );
1052 }
1053
1054 bool wxTopLevelWindowGTK::IsMaximized() const
1055 {
1056     if(!m_widget->window)
1057         return false;
1058
1059     return gdk_window_get_state(m_widget->window) & GDK_WINDOW_STATE_MAXIMIZED;
1060 }
1061
1062 void wxTopLevelWindowGTK::Restore()
1063 {
1064     // "Present" seems similar enough to "restore"
1065     gtk_window_present( GTK_WINDOW( m_widget ) );
1066 }
1067
1068 void wxTopLevelWindowGTK::Iconize( bool iconize )
1069 {
1070     if (iconize)
1071         gtk_window_iconify( GTK_WINDOW( m_widget ) );
1072     else
1073         gtk_window_deiconify( GTK_WINDOW( m_widget ) );
1074 }
1075
1076 bool wxTopLevelWindowGTK::IsIconized() const
1077 {
1078     return m_isIconized;
1079 }
1080
1081 void wxTopLevelWindowGTK::SetIconizeState(bool iconize)
1082 {
1083     if ( iconize != m_isIconized )
1084     {
1085         m_isIconized = iconize;
1086         (void)SendIconizeEvent(iconize);
1087     }
1088 }
1089
1090 void wxTopLevelWindowGTK::AddGrab()
1091 {
1092     if (!m_grabbed)
1093     {
1094         m_grabbed = true;
1095         gtk_grab_add( m_widget );
1096         wxGUIEventLoop().Run();
1097         gtk_grab_remove( m_widget );
1098     }
1099 }
1100
1101 void wxTopLevelWindowGTK::RemoveGrab()
1102 {
1103     if (m_grabbed)
1104     {
1105         gtk_main_quit();
1106         m_grabbed = false;
1107     }
1108 }
1109
1110
1111 // helper
1112 static bool do_shape_combine_region(GdkWindow* window, const wxRegion& region)
1113 {
1114     if (window)
1115     {
1116         if (region.IsEmpty())
1117         {
1118             gdk_window_shape_combine_mask(window, NULL, 0, 0);
1119         }
1120         else
1121         {
1122             gdk_window_shape_combine_region(window, region.GetRegion(), 0, 0);
1123             return true;
1124         }
1125     }
1126     return false;
1127 }
1128
1129
1130 bool wxTopLevelWindowGTK::SetShape(const wxRegion& region)
1131 {
1132     wxCHECK_MSG( HasFlag(wxFRAME_SHAPED), false,
1133                  _T("Shaped windows must be created with the wxFRAME_SHAPED style."));
1134
1135     GdkWindow *window = NULL;
1136     if (m_wxwindow)
1137     {
1138         window = GTK_PIZZA(m_wxwindow)->bin_window;
1139         do_shape_combine_region(window, region);
1140     }
1141     window = m_widget->window;
1142     return do_shape_combine_region(window, region);
1143 }
1144
1145 bool wxTopLevelWindowGTK::IsActive()
1146 {
1147     return (this == (wxTopLevelWindowGTK*)g_activeFrame);
1148 }
1149
1150 void wxTopLevelWindowGTK::RequestUserAttention(int flags)
1151 {
1152     bool new_hint_value = false;
1153
1154     // FIXME: This is a workaround to focus handling problem
1155     // If RequestUserAttention is called for example right after a wxSleep, OnInternalIdle hasn't
1156     // yet been processed, and the internal focus system is not up to date yet.
1157     // wxYieldIfNeeded ensures the processing of it, but can have unwanted side effects - MR
1158     ::wxYieldIfNeeded();
1159
1160     if(m_urgency_hint >= 0)
1161         g_source_remove(m_urgency_hint);
1162
1163     m_urgency_hint = -2;
1164
1165     if( GTK_WIDGET_REALIZED(m_widget) && !IsActive() )
1166     {
1167         new_hint_value = true;
1168
1169         if (flags & wxUSER_ATTENTION_INFO)
1170         {
1171             m_urgency_hint = g_timeout_add(5000, (GSourceFunc)gtk_frame_urgency_timer_callback, this);
1172         } else {
1173             m_urgency_hint = -1;
1174         }
1175     }
1176
1177 #if GTK_CHECK_VERSION(2,7,0)
1178     if(!gtk_check_version(2,7,0))
1179         gtk_window_set_urgency_hint(GTK_WINDOW( m_widget ), new_hint_value);
1180     else
1181 #endif
1182         wxgtk_window_set_urgency_hint(GTK_WINDOW( m_widget ), new_hint_value);
1183 }
1184
1185 void wxTopLevelWindowGTK::SetWindowStyleFlag( long style )
1186 {
1187 #if defined(__WXGTK24__) || GTK_CHECK_VERSION(2,2,0)
1188     // Store which styles were changed
1189     long styleChanges = style ^ m_windowStyle;
1190 #endif
1191
1192     // Process wxWindow styles. This also updates the internal variable
1193     // Therefore m_windowStyle bits carry now the _new_ style values
1194     wxWindow::SetWindowStyleFlag(style);
1195
1196     // just return for now if widget does not exist yet
1197     if (!m_widget)
1198         return;
1199
1200 #ifdef __WXGTK24__
1201     if ( (styleChanges & wxSTAY_ON_TOP) && !gtk_check_version(2,4,0) )
1202         gtk_window_set_keep_above(GTK_WINDOW(m_widget), m_windowStyle & wxSTAY_ON_TOP);
1203 #endif // GTK+ 2.4
1204 #if GTK_CHECK_VERSION(2,2,0)
1205     if ( (styleChanges & wxFRAME_NO_TASKBAR) && !gtk_check_version(2,2,0) )
1206     {
1207         gtk_window_set_skip_taskbar_hint(GTK_WINDOW(m_widget), m_windowStyle & wxFRAME_NO_TASKBAR);
1208     }
1209 #endif // GTK+ 2.2
1210 }
1211
1212 /* Get the X Window between child and the root window.
1213    This should usually be the WM managed XID */
1214 static Window wxGetTopmostWindowX11(Display *dpy, Window child)
1215 {
1216     Window root, parent;
1217     Window* children;
1218     unsigned int nchildren;
1219
1220     XQueryTree(dpy, child, &root, &parent, &children, &nchildren);
1221     XFree(children);
1222
1223     while (parent != root) {
1224         child = parent;
1225         XQueryTree(dpy, child, &root, &parent, &children, &nchildren);
1226         XFree(children);
1227     }
1228
1229     return child;
1230 }
1231
1232 bool wxTopLevelWindowGTK::SetTransparent(wxByte alpha)
1233 {
1234     if (!m_widget || !m_widget->window)
1235         return false;
1236
1237     Display* dpy = GDK_WINDOW_XDISPLAY (m_widget->window);
1238     // We need to get the X Window that has the root window as the immediate parent
1239     // and m_widget->window as a child. This should be the X Window that the WM manages and
1240     // from which the opacity property is checked from.
1241     Window win = wxGetTopmostWindowX11(dpy, GDK_WINDOW_XID (m_widget->window));
1242
1243
1244     // Using pure Xlib to not have a GTK version check mess due to gtk2.0 not having GdkDisplay
1245     if (alpha == 0xff)
1246         XDeleteProperty(dpy, win, XInternAtom(dpy, "_NET_WM_WINDOW_OPACITY", False));
1247     else
1248     {
1249         long opacity = alpha * 0x1010101L;
1250         XChangeProperty(dpy, win, XInternAtom(dpy, "_NET_WM_WINDOW_OPACITY", False),
1251                         XA_CARDINAL, 32, PropModeReplace,
1252                         (unsigned char *) &opacity, 1L);
1253     }
1254     XSync(dpy, False);
1255     return true;
1256 }
1257
1258 bool wxTopLevelWindowGTK::CanSetTransparent()
1259 {
1260     // allow to override automatic detection as it's far from perfect
1261     static const wxChar *SYSOPT_TRANSPARENT = wxT("gtk.tlw.can-set-transparent");
1262     if ( wxSystemOptions::HasOption(SYSOPT_TRANSPARENT) )
1263     {
1264         return wxSystemOptions::GetOptionInt(SYSOPT_TRANSPARENT) != 0;
1265     }
1266
1267 #if GTK_CHECK_VERSION(2,10,0)
1268     if (!gtk_check_version(2,10,0))
1269     {
1270         return (gtk_widget_is_composited (m_widget));
1271     }
1272     else
1273 #endif // In case of lower versions than gtk+-2.10.0 we could look for _NET_WM_CM_Sn ourselves
1274     {
1275         return false;
1276     }
1277
1278 #if 0 // Don't be optimistic here for the sake of wxAUI
1279     int opcode, event, error;
1280     // Check for the existence of a RGBA visual instead?
1281     return XQueryExtension(gdk_x11_get_default_xdisplay (),
1282                            "Composite", &opcode, &event, &error);
1283 #endif
1284 }