1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/gtk/toplevel.cpp
4 // Author: Robert Roebling
5 // Copyright: (c) 1998 Robert Roebling
6 // Licence: wxWindows licence
7 /////////////////////////////////////////////////////////////////////////////
9 // For compilers that support precompilation, includes "wx.h".
10 #include "wx/wxprec.h"
12 // ============================================================================
14 // ============================================================================
16 // ----------------------------------------------------------------------------
18 // ----------------------------------------------------------------------------
21 #define XIconifyWindow XICONIFYWINDOW
24 #include "wx/toplevel.h"
33 #include "wx/evtloop.h"
34 #include "wx/sysopt.h"
37 #ifdef GDK_WINDOWING_X11
39 #include <X11/Xatom.h> // XA_CARDINAL
40 #include "wx/unix/utilsx11.h"
43 #include "wx/gtk/private.h"
44 #include "wx/gtk/private/gtk2-compat.h"
45 #include "wx/gtk/private/win_gtk.h"
48 #include <hildon-widgets/hildon-program.h>
49 #include <hildon-widgets/hildon-window.h>
50 #endif // wxUSE_LIBHILDON
53 #include <hildon/hildon.h>
54 #endif // wxUSE_LIBHILDON2
56 // ----------------------------------------------------------------------------
58 // ----------------------------------------------------------------------------
60 // this is incremented while a modal dialog is shown
61 int wxOpenModalDialogsCount
= 0;
63 // the frame that is currently active (i.e. its child has focus). It is
64 // used to generate wxActivateEvents
65 static wxTopLevelWindowGTK
*g_activeFrame
= NULL
;
66 static wxTopLevelWindowGTK
*g_lastActiveFrame
= NULL
;
68 // if we detect that the app has got/lost the focus, we set this variable to
69 // either TRUE or FALSE and an activate event will be sent during the next
70 // OnIdle() call and it is reset to -1: this value means that we shouldn't
71 // send any activate events at all
72 static int g_sendActivateEvent
= -1;
74 // Whether _NET_REQUEST_FRAME_EXTENTS support is working
75 // 0 == not tested yet, 1 == working, 2 == broken
76 static int gs_requestFrameExtentsStatus
;
78 //-----------------------------------------------------------------------------
79 // RequestUserAttention related functions
80 //-----------------------------------------------------------------------------
83 static void wxgtk_window_set_urgency_hint (GtkWindow
*win
,
86 #if GTK_CHECK_VERSION(2,7,0)
87 if (gtk_check_version(2,7,0) == NULL
)
88 gtk_window_set_urgency_hint(win
, setting
);
92 #ifdef GDK_WINDOWING_X11
93 GdkWindow
* window
= gtk_widget_get_window(GTK_WIDGET(win
));
94 wxCHECK_RET(window
, "wxgtk_window_set_urgency_hint: GdkWindow not realized");
96 Display
* dpy
= GDK_WINDOW_XDISPLAY(window
);
97 Window xid
= GDK_WINDOW_XID(window
);
98 XWMHints
* wm_hints
= XGetWMHints(dpy
, xid
);
101 wm_hints
= XAllocWMHints();
104 wm_hints
->flags
|= XUrgencyHint
;
106 wm_hints
->flags
&= ~XUrgencyHint
;
108 XSetWMHints(dpy
, xid
, wm_hints
);
110 #endif // GDK_WINDOWING_X11
113 #define gtk_window_set_urgency_hint wxgtk_window_set_urgency_hint
117 static gboolean
gtk_frame_urgency_timer_callback( wxTopLevelWindowGTK
*win
)
119 gtk_window_set_urgency_hint(GTK_WINDOW(win
->m_widget
), false);
121 win
->m_urgency_hint
= -2;
126 //-----------------------------------------------------------------------------
128 //-----------------------------------------------------------------------------
131 static gboolean
gtk_frame_focus_in_callback( GtkWidget
*widget
,
132 GdkEvent
*WXUNUSED(event
),
133 wxTopLevelWindowGTK
*win
)
135 switch ( g_sendActivateEvent
)
138 // we've got focus from outside, synthetize wxActivateEvent
139 g_sendActivateEvent
= 1;
143 // another our window just lost focus, it was already ours before
144 // - don't send any wxActivateEvent
145 g_sendActivateEvent
= -1;
150 g_lastActiveFrame
= g_activeFrame
;
152 // wxPrintf( wxT("active: %s\n"), win->GetTitle().c_str() );
154 // MR: wxRequestUserAttention related block
155 switch( win
->m_urgency_hint
)
158 g_source_remove( win
->m_urgency_hint
);
159 // no break, fallthrough to remove hint too
161 gtk_window_set_urgency_hint(GTK_WINDOW(widget
), false);
162 win
->m_urgency_hint
= -2;
168 wxLogTrace(wxT("activate"), wxT("Activating frame %p (from focus_in)"), g_activeFrame
);
169 wxActivateEvent
event(wxEVT_ACTIVATE
, true, g_activeFrame
->GetId());
170 event
.SetEventObject(g_activeFrame
);
171 g_activeFrame
->HandleWindowEvent(event
);
177 //-----------------------------------------------------------------------------
179 //-----------------------------------------------------------------------------
183 gboolean
gtk_frame_focus_out_callback(GtkWidget
* WXUNUSED(widget
),
184 GdkEventFocus
*WXUNUSED(gdk_event
),
185 wxTopLevelWindowGTK
* WXUNUSED(win
))
187 // if the focus goes out of our app altogether, OnIdle() will send
188 // wxActivateEvent, otherwise gtk_window_focus_in_callback() will reset
189 // g_sendActivateEvent to -1
190 g_sendActivateEvent
= 0;
192 // wxASSERT_MSG( (g_activeFrame == win), wxT("TLW deactivatd although it wasn't active") );
194 // wxPrintf( wxT("inactive: %s\n"), win->GetTitle().c_str() );
198 wxLogTrace(wxT("activate"), wxT("Activating frame %p (from focus_in)"), g_activeFrame
);
199 wxActivateEvent
event(wxEVT_ACTIVATE
, false, g_activeFrame
->GetId());
200 event
.SetEventObject(g_activeFrame
);
201 g_activeFrame
->HandleWindowEvent(event
);
203 g_activeFrame
= NULL
;
210 // ----------------------------------------------------------------------------
212 // ----------------------------------------------------------------------------
216 wxgtk_tlw_key_press_event(GtkWidget
*widget
, GdkEventKey
*event
)
218 GtkWindow
* const window
= GTK_WINDOW(widget
);
220 // By default GTK+ checks for the menu accelerators in this (top level)
221 // window first and then propagates the event to the currently focused
222 // child from where it bubbles up the window parent chain. In wxWidgets,
223 // however, we want the child window to have the event first but still
224 // handle it as an accelerator if it's not processed there, so we need to
225 // customize this by reversing the order of the steps done in the standard
226 // GTK+ gtk_window_key_press_event() handler.
228 if ( gtk_window_propagate_key_event(window
, event
) )
231 if ( gtk_window_activate_key(window
, event
) )
234 if (GTK_WIDGET_GET_CLASS(widget
)->key_press_event(widget
, event
))
241 //-----------------------------------------------------------------------------
242 // "size_allocate" from m_wxwindow
243 //-----------------------------------------------------------------------------
247 size_allocate(GtkWidget
*, GtkAllocation
* alloc
, wxTopLevelWindowGTK
* win
)
249 win
->m_useCachedClientSize
= true;
250 if (win
->m_clientWidth
!= alloc
->width
||
251 win
->m_clientHeight
!= alloc
->height
)
253 win
->m_clientWidth
= alloc
->width
;
254 win
->m_clientHeight
= alloc
->height
;
257 gtk_widget_get_allocation(win
->m_widget
, &a
);
258 wxSize
size(a
.width
, a
.height
);
259 size
+= win
->m_decorSize
;
260 win
->m_width
= size
.x
;
261 win
->m_height
= size
.y
;
263 if (!win
->IsIconized())
265 wxSizeEvent
event(size
, win
->GetId());
266 event
.SetEventObject(win
);
267 win
->HandleWindowEvent(event
);
269 // else the window is currently unmapped, don't generate size events
274 //-----------------------------------------------------------------------------
276 //-----------------------------------------------------------------------------
280 gtk_frame_delete_callback( GtkWidget
*WXUNUSED(widget
),
281 GdkEvent
*WXUNUSED(event
),
282 wxTopLevelWindowGTK
*win
)
284 if (win
->IsEnabled() &&
285 (wxOpenModalDialogsCount
== 0 || (win
->GetExtraStyle() & wxTOPLEVEL_EX_DIALOG
) ||
293 //-----------------------------------------------------------------------------
295 //-----------------------------------------------------------------------------
299 gtk_frame_configure_callback( GtkWidget
* widget
,
300 GdkEventConfigure
*WXUNUSED(event
),
301 wxTopLevelWindowGTK
*win
)
307 gtk_window_get_position((GtkWindow
*)widget
, &point
.x
, &point
.y
);
311 wxMoveEvent
mevent(point
, win
->GetId());
312 mevent
.SetEventObject( win
);
313 win
->HandleWindowEvent( mevent
);
319 //-----------------------------------------------------------------------------
320 // "realize" from m_widget
321 //-----------------------------------------------------------------------------
323 // we cannot the WM hints and icons before the widget has been realized,
324 // so we do this directly after realization
326 void wxTopLevelWindowGTK::GTKHandleRealized()
328 wxNonOwnedWindow::GTKHandleRealized();
330 gdk_window_set_decorations(gtk_widget_get_window(m_widget
),
331 (GdkWMDecoration
)m_gdkDecor
);
332 gdk_window_set_functions(gtk_widget_get_window(m_widget
),
333 (GdkWMFunction
)m_gdkFunc
);
335 // GTK's shrinking/growing policy
336 if ( !(m_gdkFunc
& GDK_FUNC_RESIZE
) )
337 gtk_window_set_resizable(GTK_WINDOW(m_widget
), FALSE
);
340 gtk_window_set_policy(GTK_WINDOW(m_widget
), 1, 1, 1);
343 const wxIconBundle
& icons
= GetIcons();
344 if (icons
.GetIconCount())
348 if (gtk_window_get_has_resize_grip(GTK_WINDOW(m_widget
)))
350 // Grip window can end up obscured, probably due to deferred show.
351 // Reset grip to ensure it is visible.
352 gtk_window_set_has_resize_grip(GTK_WINDOW(m_widget
), false);
353 gtk_window_set_has_resize_grip(GTK_WINDOW(m_widget
), true);
358 //-----------------------------------------------------------------------------
359 // "map_event" from m_widget
360 //-----------------------------------------------------------------------------
364 gtk_frame_map_callback( GtkWidget
*,
365 GdkEvent
* WXUNUSED(event
),
366 wxTopLevelWindow
*win
)
368 const bool wasIconized
= win
->IsIconized();
371 // Because GetClientSize() returns (0,0) when IsIconized() is true,
372 // a size event must be generated, just in case GetClientSize() was
373 // called while iconized. This specifically happens when restoring a
374 // tlw that was "rolled up" with some WMs.
375 // Queue a resize rather than sending size event directly to allow
376 // children to be made visible first.
377 win
->m_useCachedClientSize
= false;
378 win
->m_clientWidth
= 0;
379 gtk_widget_queue_resize(win
->m_wxwindow
);
381 // it is possible for m_isShown to be false here, see bug #9909
382 if (win
->wxWindowBase::Show(true))
384 wxShowEvent
eventShow(win
->GetId(), true);
385 eventShow
.SetEventObject(win
);
386 win
->GetEventHandler()->ProcessEvent(eventShow
);
389 // restore focus-on-map setting in case ShowWithoutActivating() was called
390 gtk_window_set_focus_on_map(GTK_WINDOW(win
->m_widget
), true);
396 //-----------------------------------------------------------------------------
397 // "window-state-event" from m_widget
398 //-----------------------------------------------------------------------------
402 gtk_frame_window_state_callback( GtkWidget
* WXUNUSED(widget
),
403 GdkEventWindowState
*event
,
404 wxTopLevelWindow
*win
)
406 if (event
->changed_mask
& GDK_WINDOW_STATE_ICONIFIED
)
407 win
->SetIconizeState((event
->new_window_state
& GDK_WINDOW_STATE_ICONIFIED
) != 0);
409 // if maximized bit changed and it is now set
410 if (event
->changed_mask
& event
->new_window_state
& GDK_WINDOW_STATE_MAXIMIZED
)
412 wxMaximizeEvent
evt(win
->GetId());
413 evt
.SetEventObject(win
);
414 win
->HandleWindowEvent(evt
);
417 if (event
->changed_mask
& GDK_WINDOW_STATE_FULLSCREEN
)
418 win
->m_fsIsShowing
= (event
->new_window_state
& GDK_WINDOW_STATE_FULLSCREEN
) != 0;
424 //-----------------------------------------------------------------------------
426 bool wxGetFrameExtents(GdkWindow
* window
, int* left
, int* right
, int* top
, int* bottom
)
428 #ifdef GDK_WINDOWING_X11
429 static GdkAtom property
= gdk_atom_intern("_NET_FRAME_EXTENTS", false);
430 GdkDisplay
* display
= gdk_window_get_display(window
);
431 Atom xproperty
= gdk_x11_atom_to_xatom_for_display(display
, property
);
434 gulong nitems
, bytes_after
;
436 Status status
= XGetWindowProperty(
437 GDK_DISPLAY_XDISPLAY(display
),
438 GDK_WINDOW_XID(window
),
440 0, 4, false, XA_CARDINAL
,
441 &type
, &format
, &nitems
, &bytes_after
, &data
);
442 const bool success
= status
== Success
&& data
&& nitems
== 4;
445 long* p
= (long*)data
;
446 if (left
) *left
= int(p
[0]);
447 if (right
) *right
= int(p
[1]);
448 if (top
) *top
= int(p
[2]);
449 if (bottom
) *bottom
= int(p
[3]);
459 #ifdef GDK_WINDOWING_X11
460 //-----------------------------------------------------------------------------
461 // "property_notify_event" from m_widget
462 //-----------------------------------------------------------------------------
465 static gboolean
property_notify_event(
466 GtkWidget
*, GdkEventProperty
* event
, wxTopLevelWindowGTK
* win
)
468 // Watch for changes to _NET_FRAME_EXTENTS property
469 static GdkAtom property
= gdk_atom_intern("_NET_FRAME_EXTENTS", false);
470 if (event
->state
== GDK_PROPERTY_NEW_VALUE
&& event
->atom
== property
)
472 if (win
->m_netFrameExtentsTimerId
)
474 // WM support for _NET_REQUEST_FRAME_EXTENTS is working
475 gs_requestFrameExtentsStatus
= 1;
476 g_source_remove(win
->m_netFrameExtentsTimerId
);
477 win
->m_netFrameExtentsTimerId
= 0;
480 wxSize decorSize
= win
->m_decorSize
;
481 int left
, right
, top
, bottom
;
482 if (wxGetFrameExtents(event
->window
, &left
, &right
, &top
, &bottom
))
483 decorSize
.Set(left
+ right
, top
+ bottom
);
485 win
->GTKUpdateDecorSize(decorSize
);
492 static gboolean
request_frame_extents_timeout(void* data
)
494 // WM support for _NET_REQUEST_FRAME_EXTENTS is broken
495 gs_requestFrameExtentsStatus
= 2;
497 wxTopLevelWindowGTK
* win
= static_cast<wxTopLevelWindowGTK
*>(data
);
498 win
->m_netFrameExtentsTimerId
= 0;
499 wxSize decorSize
= win
->m_decorSize
;
500 int left
, right
, top
, bottom
;
501 if (wxGetFrameExtents(gtk_widget_get_window(win
->m_widget
), &left
, &right
, &top
, &bottom
))
502 decorSize
.Set(left
+ right
, top
+ bottom
);
503 win
->GTKUpdateDecorSize(decorSize
);
508 #endif // GDK_WINDOWING_X11
510 // ----------------------------------------------------------------------------
511 // wxTopLevelWindowGTK creation
512 // ----------------------------------------------------------------------------
514 void wxTopLevelWindowGTK::Init()
517 m_isIconized
= false;
518 m_fsIsShowing
= false;
519 m_themeEnabled
= true;
524 m_deferShowAllowed
= true;
525 m_updateDecorSize
= true;
526 m_netFrameExtentsTimerId
= 0;
527 m_incWidth
= m_incHeight
= 0;
532 bool wxTopLevelWindowGTK::Create( wxWindow
*parent
,
534 const wxString
& title
,
536 const wxSize
& sizeOrig
,
538 const wxString
&name
)
540 // always create a frame of some reasonable, even if arbitrary, size (at
541 // least for MSW compatibility)
542 wxSize size
= sizeOrig
;
543 size
.x
= WidthDefault(size
.x
);
544 size
.y
= HeightDefault(size
.y
);
546 wxTopLevelWindows
.Append( this );
548 if (!PreCreation( parent
, pos
, size
) ||
549 !CreateBase( parent
, id
, pos
, size
, style
, wxDefaultValidator
, name
))
551 wxFAIL_MSG( wxT("wxTopLevelWindowGTK creation failed") );
557 // NB: m_widget may be !=NULL if it was created by derived class' Create,
558 // e.g. in wxTaskBarIconAreaGTK
559 if (m_widget
== NULL
)
561 #if wxUSE_LIBHILDON || wxUSE_LIBHILDON2
562 // we must create HildonWindow and not a normal GtkWindow as the latter
563 // doesn't look correctly in Maemo environment and it must also be
564 // registered with the main program object
565 m_widget
= hildon_window_new();
566 hildon_program_add_window(wxTheApp
->GetHildonProgram(),
567 HILDON_WINDOW(m_widget
));
568 #else // !wxUSE_LIBHILDON || !wxUSE_LIBHILDON2
569 m_widget
= gtk_window_new(GTK_WINDOW_TOPLEVEL
);
570 if (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG
)
572 // Tell WM that this is a dialog window and make it center
573 // on parent by default (this is what GtkDialog ctor does):
574 gtk_window_set_type_hint(GTK_WINDOW(m_widget
),
575 GDK_WINDOW_TYPE_HINT_DIALOG
);
576 gtk_window_set_position(GTK_WINDOW(m_widget
),
577 GTK_WIN_POS_CENTER_ON_PARENT
);
581 if (style
& wxFRAME_TOOL_WINDOW
)
583 gtk_window_set_type_hint(GTK_WINDOW(m_widget
),
584 GDK_WINDOW_TYPE_HINT_UTILITY
);
586 // On some WMs, like KDE, a TOOL_WINDOW will still show
587 // on the taskbar, but on Gnome a TOOL_WINDOW will not.
588 // For consistency between WMs and with Windows, we
589 // should set the NO_TASKBAR flag which will apply
590 // the set_skip_taskbar_hint if it is available,
591 // ensuring no taskbar entry will appear.
592 style
|= wxFRAME_NO_TASKBAR
;
595 #endif // wxUSE_LIBHILDON || wxUSE_LIBHILDON2/!wxUSE_LIBHILDON || !wxUSE_LIBHILDON2
597 g_object_ref(m_widget
);
600 wxWindow
*topParent
= wxGetTopLevelParent(m_parent
);
601 if (topParent
&& (((GTK_IS_WINDOW(topParent
->m_widget
)) &&
602 (GetExtraStyle() & wxTOPLEVEL_EX_DIALOG
)) ||
603 (style
& wxFRAME_FLOAT_ON_PARENT
)))
605 gtk_window_set_transient_for( GTK_WINDOW(m_widget
),
606 GTK_WINDOW(topParent
->m_widget
) );
609 if (style
& wxFRAME_NO_TASKBAR
)
611 gtk_window_set_skip_taskbar_hint(GTK_WINDOW(m_widget
), TRUE
);
614 if (style
& wxSTAY_ON_TOP
)
616 gtk_window_set_keep_above(GTK_WINDOW(m_widget
), TRUE
);
618 if (style
& wxMAXIMIZE
)
619 gtk_window_maximize(GTK_WINDOW(m_widget
));
623 gtk_window_set_role( GTK_WINDOW(m_widget
), wxGTK_CONV( name
) );
626 gtk_window_set_title( GTK_WINDOW(m_widget
), wxGTK_CONV( title
) );
627 gtk_widget_set_can_focus(m_widget
, false);
629 g_signal_connect (m_widget
, "delete_event",
630 G_CALLBACK (gtk_frame_delete_callback
), this);
632 // m_mainWidget is a GtkVBox, holding the bars and client area (m_wxwindow)
633 m_mainWidget
= gtk_box_new(GTK_ORIENTATION_VERTICAL
, 0);
634 gtk_widget_show( m_mainWidget
);
635 gtk_widget_set_can_focus(m_mainWidget
, false);
636 gtk_container_add( GTK_CONTAINER(m_widget
), m_mainWidget
);
638 // m_wxwindow is the client area
639 m_wxwindow
= wxPizza::New();
640 gtk_widget_show( m_wxwindow
);
641 gtk_box_pack_start(GTK_BOX(m_mainWidget
), m_wxwindow
, true, true, 0);
643 // we donm't allow the frame to get the focus as otherwise
644 // the frame will grab it at arbitrary focus changes
645 gtk_widget_set_can_focus(m_wxwindow
, false);
647 if (m_parent
) m_parent
->AddChild( this );
649 g_signal_connect(m_wxwindow
, "size_allocate",
650 G_CALLBACK(size_allocate
), this);
655 if ((m_x
!= -1) || (m_y
!= -1))
656 gtk_widget_set_uposition( m_widget
, m_x
, m_y
);
659 // for some reported size corrections
660 g_signal_connect (m_widget
, "map_event",
661 G_CALLBACK (gtk_frame_map_callback
), this);
663 // for iconized state
664 g_signal_connect (m_widget
, "window_state_event",
665 G_CALLBACK (gtk_frame_window_state_callback
), this);
669 g_signal_connect (m_widget
, "configure_event",
670 G_CALLBACK (gtk_frame_configure_callback
), this);
673 g_signal_connect_after (m_widget
, "focus_in_event",
674 G_CALLBACK (gtk_frame_focus_in_callback
), this);
675 g_signal_connect_after (m_widget
, "focus_out_event",
676 G_CALLBACK (gtk_frame_focus_out_callback
), this);
678 // We need to customize the default GTK+ logic for key processing to make
679 // it conforming to wxWidgets event processing order.
680 g_signal_connect (m_widget
, "key_press_event",
681 G_CALLBACK (wxgtk_tlw_key_press_event
), NULL
);
683 #ifdef GDK_WINDOWING_X11
685 if (GDK_IS_X11_SCREEN(gtk_window_get_screen(GTK_WINDOW(m_widget
))))
688 gtk_widget_add_events(m_widget
, GDK_PROPERTY_CHANGE_MASK
);
689 g_signal_connect(m_widget
, "property_notify_event",
690 G_CALLBACK(property_notify_event
), this);
692 #endif // GDK_WINDOWING_X11
694 // translate wx decorations styles into Motif WM hints (they are recognized
695 // by other WMs as well)
697 // always enable moving the window as we have no separate flag for enabling
699 m_gdkFunc
= GDK_FUNC_MOVE
;
701 if ( style
& wxCLOSE_BOX
)
702 m_gdkFunc
|= GDK_FUNC_CLOSE
;
704 if ( style
& wxMINIMIZE_BOX
)
705 m_gdkFunc
|= GDK_FUNC_MINIMIZE
;
707 if ( style
& wxMAXIMIZE_BOX
)
708 m_gdkFunc
|= GDK_FUNC_MAXIMIZE
;
710 if ( (style
& wxSIMPLE_BORDER
) || (style
& wxNO_BORDER
) )
716 m_gdkDecor
= GDK_DECOR_BORDER
;
718 if ( style
& wxCAPTION
)
719 m_gdkDecor
|= GDK_DECOR_TITLE
;
721 if ( style
& wxSYSTEM_MENU
)
722 m_gdkDecor
|= GDK_DECOR_MENU
;
724 if ( style
& wxMINIMIZE_BOX
)
725 m_gdkDecor
|= GDK_DECOR_MINIMIZE
;
727 if ( style
& wxMAXIMIZE_BOX
)
728 m_gdkDecor
|= GDK_DECOR_MAXIMIZE
;
730 if ( style
& wxRESIZE_BORDER
)
732 m_gdkFunc
|= GDK_FUNC_RESIZE
;
733 m_gdkDecor
|= GDK_DECOR_RESIZEH
;
737 // GTK sometimes chooses very small size if max size hint is not explicitly set
738 DoSetSizeHints(m_minWidth
, m_minHeight
, m_maxWidth
, m_maxHeight
, m_incWidth
, m_incHeight
);
740 m_decorSize
= GetCachedDecorSize();
742 GTKDoGetSize(&w
, &h
);
743 gtk_window_set_default_size(GTK_WINDOW(m_widget
), w
, h
);
748 wxTopLevelWindowGTK::~wxTopLevelWindowGTK()
750 if ( m_netFrameExtentsTimerId
)
752 // Don't let the timer callback fire as the window pointer passed to it
753 // will become invalid very soon.
754 g_source_remove(m_netFrameExtentsTimerId
);
757 #if wxUSE_LIBHILDON || wxUSE_LIBHILDON2
758 // it can also be a (standard) dialog
759 if ( HILDON_IS_WINDOW(m_widget
) )
761 hildon_program_remove_window(wxTheApp
->GetHildonProgram(),
762 HILDON_WINDOW(m_widget
));
764 #endif // wxUSE_LIBHILDON || wxUSE_LIBHILDON2
768 wxFAIL_MSG(wxT("Window still grabbed"));
774 // it may also be GtkScrolledWindow in the case of an MDI child
775 if (GTK_IS_WINDOW(m_widget
))
777 gtk_window_set_focus( GTK_WINDOW(m_widget
), NULL
);
780 if (g_activeFrame
== this)
781 g_activeFrame
= NULL
;
782 if (g_lastActiveFrame
== this)
783 g_lastActiveFrame
= NULL
;
786 bool wxTopLevelWindowGTK::EnableCloseButton( bool enable
)
789 m_gdkFunc
|= GDK_FUNC_CLOSE
;
791 m_gdkFunc
&= ~GDK_FUNC_CLOSE
;
793 GdkWindow
* window
= gtk_widget_get_window(m_widget
);
795 gdk_window_set_functions(window
, (GdkWMFunction
)m_gdkFunc
);
800 bool wxTopLevelWindowGTK::ShowFullScreen(bool show
, long)
802 if (show
== m_fsIsShowing
)
803 return false; // return what?
805 m_fsIsShowing
= show
;
807 #ifdef GDK_WINDOWING_X11
808 Display
* xdpy
= GDK_DISPLAY_XDISPLAY(gtk_widget_get_display(m_widget
));
809 Window xroot
= GDK_WINDOW_XID(gtk_widget_get_root_window(m_widget
));
810 wxX11FullScreenMethod method
= wxGetFullScreenMethodX11(xdpy
, (WXWindow
)xroot
);
812 // NB: gtk_window_fullscreen() uses freedesktop.org's WMspec extensions
813 // to switch to fullscreen, which is not always available. We must
814 // check if WM supports the spec and use legacy methods if it
816 if ( method
== wxX11_FS_WMSPEC
)
817 #endif // GDK_WINDOWING_X11
820 gtk_window_fullscreen( GTK_WINDOW( m_widget
) );
822 gtk_window_unfullscreen( GTK_WINDOW( m_widget
) );
824 #ifdef GDK_WINDOWING_X11
827 GdkWindow
* window
= gtk_widget_get_window(m_widget
);
828 Window xid
= GDK_WINDOW_XID(window
);
832 GetPosition( &m_fsSaveFrame
.x
, &m_fsSaveFrame
.y
);
833 GetSize( &m_fsSaveFrame
.width
, &m_fsSaveFrame
.height
);
835 GdkScreen
* screen
= gtk_widget_get_screen(m_widget
);
836 const int screen_width
= gdk_screen_get_width(screen
);
837 const int screen_height
= gdk_screen_get_height(screen
);
839 gint client_x
, client_y
, root_x
, root_y
;
842 m_fsSaveGdkFunc
= m_gdkFunc
;
843 m_fsSaveGdkDecor
= m_gdkDecor
;
844 m_gdkFunc
= m_gdkDecor
= 0;
845 gdk_window_set_decorations(window
, (GdkWMDecoration
)0);
846 gdk_window_set_functions(window
, (GdkWMFunction
)0);
848 gdk_window_get_origin(window
, &root_x
, &root_y
);
849 gdk_window_get_geometry(window
, &client_x
, &client_y
, &width
, &height
);
851 gdk_window_move_resize(
852 window
, -client_x
, -client_y
, screen_width
+ 1, screen_height
+ 1);
854 wxSetFullScreenStateX11(xdpy
,
857 show
, &m_fsSaveFrame
, method
);
861 m_gdkFunc
= m_fsSaveGdkFunc
;
862 m_gdkDecor
= m_fsSaveGdkDecor
;
863 gdk_window_set_decorations(window
, (GdkWMDecoration
)m_gdkDecor
);
864 gdk_window_set_functions(window
, (GdkWMFunction
)m_gdkFunc
);
866 wxSetFullScreenStateX11(xdpy
,
869 show
, &m_fsSaveFrame
, method
);
871 SetSize(m_fsSaveFrame
.x
, m_fsSaveFrame
.y
,
872 m_fsSaveFrame
.width
, m_fsSaveFrame
.height
);
875 #endif // GDK_WINDOWING_X11
877 // documented behaviour is to show the window if it's still hidden when
878 // showing it full screen
885 // ----------------------------------------------------------------------------
886 // overridden wxWindow methods
887 // ----------------------------------------------------------------------------
889 void wxTopLevelWindowGTK::Refresh( bool WXUNUSED(eraseBackground
), const wxRect
*WXUNUSED(rect
) )
891 wxCHECK_RET( m_widget
, wxT("invalid frame") );
893 gtk_widget_queue_draw( m_widget
);
895 GdkWindow
* window
= NULL
;
897 window
= gtk_widget_get_window(m_wxwindow
);
899 gdk_window_invalidate_rect(window
, NULL
, true);
902 bool wxTopLevelWindowGTK::Show( bool show
)
904 wxASSERT_MSG( (m_widget
!= NULL
), wxT("invalid frame") );
906 #ifdef GDK_WINDOWING_X11
907 bool deferShow
= show
&& !m_isShown
&& m_deferShow
;
910 deferShow
= m_deferShowAllowed
&& gs_requestFrameExtentsStatus
!= 2 &&
911 !gtk_widget_get_realized(m_widget
) &&
912 g_signal_handler_find(m_widget
,
913 GSignalMatchType(G_SIGNAL_MATCH_ID
| G_SIGNAL_MATCH_DATA
),
914 g_signal_lookup("property_notify_event", GTK_TYPE_WIDGET
),
915 0, NULL
, NULL
, this);
918 GdkScreen
* screen
= gtk_widget_get_screen(m_widget
);
919 GdkAtom atom
= gdk_atom_intern("_NET_REQUEST_FRAME_EXTENTS", false);
920 deferShow
= gdk_x11_screen_supports_net_wm_hint(screen
, atom
) != 0;
922 // If _NET_REQUEST_FRAME_EXTENTS not supported, don't allow changes
923 // to m_decorSize, it breaks saving/restoring window size with
924 // GetSize()/SetSize() because it makes window bigger between each
926 m_updateDecorSize
= deferShow
;
929 m_deferShow
= deferShow
;
933 // Initial show. If WM supports _NET_REQUEST_FRAME_EXTENTS, defer
934 // calling gtk_widget_show() until _NET_FRAME_EXTENTS property
935 // notification is received, so correct frame extents are known.
936 // This allows resizing m_widget to keep the overall size in sync with
937 // what wxWidgets expects it to be without an obvious change in the
938 // window size immediately after it becomes visible.
940 // Realize m_widget, so m_widget->window can be used. Realizing normally
941 // causes the widget tree to be size_allocated, which generates size
942 // events in the wrong order. However, the size_allocates will not be
943 // done if the allocation is not the default (1,1).
945 gtk_widget_get_allocation(m_widget
, &alloc
);
946 const int alloc_width
= alloc
.width
;
947 if (alloc_width
== 1)
950 gtk_widget_set_allocation(m_widget
, &alloc
);
952 gtk_widget_realize(m_widget
);
953 if (alloc_width
== 1)
956 gtk_widget_set_allocation(m_widget
, &alloc
);
959 // send _NET_REQUEST_FRAME_EXTENTS
960 XClientMessageEvent xevent
;
961 memset(&xevent
, 0, sizeof(xevent
));
962 xevent
.type
= ClientMessage
;
963 GdkWindow
* window
= gtk_widget_get_window(m_widget
);
964 xevent
.window
= GDK_WINDOW_XID(window
);
965 xevent
.message_type
= gdk_x11_atom_to_xatom_for_display(
966 gdk_window_get_display(window
),
967 gdk_atom_intern("_NET_REQUEST_FRAME_EXTENTS", false));
969 Display
* display
= GDK_DISPLAY_XDISPLAY(gdk_window_get_display(window
));
970 XSendEvent(display
, DefaultRootWindow(display
), false,
971 SubstructureNotifyMask
| SubstructureRedirectMask
,
974 if (gs_requestFrameExtentsStatus
== 0)
976 // if WM does not respond to request within 1 second,
977 // we assume support for _NET_REQUEST_FRAME_EXTENTS is not working
978 m_netFrameExtentsTimerId
=
979 g_timeout_add(1000, request_frame_extents_timeout
, this);
982 // defer calling gtk_widget_show()
986 #endif // GDK_WINDOWING_X11
988 if (show
&& !gtk_widget_get_realized(m_widget
))
990 // size_allocate signals occur in reverse order (bottom to top).
991 // Things work better if the initial wxSizeEvents are sent (from the
992 // top down), before the initial size_allocate signals occur.
993 wxSizeEvent
event(GetSize(), GetId());
994 event
.SetEventObject(this);
995 HandleWindowEvent(event
);
998 bool change
= base_type::Show(show
);
1000 if (change
&& !show
)
1002 // make sure window has a non-default position, so when it is shown
1003 // again, it won't be repositioned by WM as if it were a new window
1004 // Note that this must be done _after_ the window is hidden.
1005 gtk_window_move((GtkWindow
*)m_widget
, m_x
, m_y
);
1011 void wxTopLevelWindowGTK::ShowWithoutActivating()
1015 gtk_window_set_focus_on_map(GTK_WINDOW(m_widget
), false);
1020 void wxTopLevelWindowGTK::Raise()
1022 gtk_window_present( GTK_WINDOW( m_widget
) );
1025 void wxTopLevelWindowGTK::DoMoveWindow(int WXUNUSED(x
), int WXUNUSED(y
), int WXUNUSED(width
), int WXUNUSED(height
) )
1027 wxFAIL_MSG( wxT("DoMoveWindow called for wxTopLevelWindowGTK") );
1030 // ----------------------------------------------------------------------------
1032 // ----------------------------------------------------------------------------
1034 void wxTopLevelWindowGTK::GTKDoGetSize(int *width
, int *height
) const
1036 wxSize
size(m_width
, m_height
);
1037 size
-= m_decorSize
;
1038 if (size
.x
< 0) size
.x
= 0;
1039 if (size
.y
< 0) size
.y
= 0;
1040 #if wxUSE_LIBHILDON2
1050 else if (size
.y
== 270)
1055 #else // wxUSE_LIBHILDON2
1056 if (width
) *width
= size
.x
;
1057 if (height
) *height
= size
.y
;
1058 #endif // wxUSE_LIBHILDON2 /!wxUSE_LIBHILDON2
1061 void wxTopLevelWindowGTK::DoSetSize( int x
, int y
, int width
, int height
, int sizeFlags
)
1063 wxCHECK_RET( m_widget
, wxT("invalid frame") );
1065 // deal with the position first
1069 if ( !(sizeFlags
& wxSIZE_ALLOW_MINUS_ONE
) )
1071 // -1 means "use existing" unless the flag above is specified
1077 else // wxSIZE_ALLOW_MINUS_ONE
1083 if ( m_x
!= old_x
|| m_y
!= old_y
)
1085 gtk_window_move( GTK_WINDOW(m_widget
), m_x
, m_y
);
1088 const wxSize
oldSize(m_width
, m_height
);
1094 if (m_width
< 1) m_width
= 1;
1095 if (m_height
< 1) m_height
= 1;
1096 if (m_width
!= oldSize
.x
|| m_height
!= oldSize
.y
)
1098 m_deferShowAllowed
= true;
1099 m_useCachedClientSize
= false;
1102 GTKDoGetSize(&w
, &h
);
1103 gtk_window_resize(GTK_WINDOW(m_widget
), w
, h
);
1105 DoGetClientSize(&m_clientWidth
, &m_clientHeight
);
1106 wxSizeEvent
event(GetSize(), GetId());
1107 event
.SetEventObject(this);
1108 HandleWindowEvent(event
);
1112 void wxTopLevelWindowGTK::DoSetClientSize(int width
, int height
)
1114 base_type::DoSetClientSize(width
, height
);
1116 // Since client size is being explicitly set, don't change it later
1117 // Has to be done after calling base because it calls SetSize,
1118 // which sets this true
1119 m_deferShowAllowed
= false;
1122 void wxTopLevelWindowGTK::DoGetClientSize( int *width
, int *height
) const
1124 wxASSERT_MSG(m_widget
, wxT("invalid frame"));
1128 // for consistency with wxMSW, client area is supposed to be empty for
1129 // the iconized windows
1135 else if (m_useCachedClientSize
)
1136 base_type::DoGetClientSize(width
, height
);
1139 GTKDoGetSize(width
, height
);
1143 void wxTopLevelWindowGTK::DoSetSizeHints( int minW
, int minH
,
1145 int incW
, int incH
)
1147 base_type::DoSetSizeHints(minW
, minH
, maxW
, maxH
, incW
, incH
);
1151 const wxSize minSize
= GetMinSize();
1152 const wxSize maxSize
= GetMaxSize();
1154 // always set both min and max hints, otherwise GTK will
1155 // make assumptions we don't want about the unset values
1156 int hints_mask
= GDK_HINT_MIN_SIZE
| GDK_HINT_MAX_SIZE
;
1157 hints
.min_width
= 1;
1158 hints
.min_height
= 1;
1159 hints
.max_width
= INT_MAX
;
1160 hints
.max_height
= INT_MAX
;
1161 if (minSize
.x
> m_decorSize
.x
)
1162 hints
.min_width
= minSize
.x
- m_decorSize
.x
;
1163 if (minSize
.y
> m_decorSize
.y
)
1164 hints
.min_height
= minSize
.y
- m_decorSize
.y
;
1167 hints
.max_width
= maxSize
.x
- m_decorSize
.x
;
1168 if (hints
.max_width
< hints
.min_width
)
1169 hints
.max_width
= hints
.min_width
;
1173 hints
.max_height
= maxSize
.y
- m_decorSize
.y
;
1174 if (hints
.max_height
< hints
.min_height
)
1175 hints
.max_height
= hints
.min_height
;
1177 if (incW
> 0 || incH
> 0)
1179 hints_mask
|= GDK_HINT_RESIZE_INC
;
1180 hints
.width_inc
= incW
> 0 ? incW
: 1;
1181 hints
.height_inc
= incH
> 0 ? incH
: 1;
1183 gtk_window_set_geometry_hints(
1184 (GtkWindow
*)m_widget
, NULL
, &hints
, (GdkWindowHints
)hints_mask
);
1187 #ifdef GDK_WINDOWING_X11
1188 void wxTopLevelWindowGTK::GTKUpdateDecorSize(const wxSize
& decorSize
)
1190 if (!IsMaximized() && !IsFullScreen())
1191 GetCachedDecorSize() = decorSize
;
1192 if (m_updateDecorSize
&& m_decorSize
!= decorSize
)
1194 m_useCachedClientSize
= false;
1195 const wxSize diff
= decorSize
- m_decorSize
;
1196 m_decorSize
= decorSize
;
1197 bool resized
= false;
1198 if (m_minWidth
> 0 || m_minHeight
> 0 || m_maxWidth
> 0 || m_maxHeight
> 0)
1200 // update size hints, they depend on m_decorSize
1201 DoSetSizeHints(m_minWidth
, m_minHeight
, m_maxWidth
, m_maxHeight
, m_incWidth
, m_incHeight
);
1205 // keep overall size unchanged by shrinking m_widget
1207 GTKDoGetSize(&w
, &h
);
1208 // but not if size would be less than minimum, it won't take effect
1209 if (w
>= m_minWidth
- decorSize
.x
&& h
>= m_minHeight
- decorSize
.y
)
1211 gtk_window_resize(GTK_WINDOW(m_widget
), w
, h
);
1217 // adjust overall size to match change in frame extents
1220 if (m_width
< 1) m_width
= 1;
1221 if (m_height
< 1) m_height
= 1;
1223 gtk_widget_queue_resize(m_wxwindow
);
1228 // gtk_widget_show() was deferred, do it now
1229 m_deferShow
= false;
1230 DoGetClientSize(&m_clientWidth
, &m_clientHeight
);
1231 wxSizeEvent
sizeEvent(GetSize(), GetId());
1232 sizeEvent
.SetEventObject(this);
1233 HandleWindowEvent(sizeEvent
);
1235 gtk_widget_show(m_widget
);
1237 wxShowEvent
showEvent(GetId(), true);
1238 showEvent
.SetEventObject(this);
1239 HandleWindowEvent(showEvent
);
1242 #endif // GDK_WINDOWING_X11
1244 wxSize
& wxTopLevelWindowGTK::GetCachedDecorSize()
1246 static wxSize size
[8];
1250 if (m_gdkDecor
& (GDK_DECOR_MENU
| GDK_DECOR_MINIMIZE
| GDK_DECOR_MAXIMIZE
| GDK_DECOR_TITLE
))
1253 if (m_gdkDecor
& GDK_DECOR_BORDER
)
1255 // utility window decor can be different
1256 if (m_windowStyle
& wxFRAME_TOOL_WINDOW
)
1261 void wxTopLevelWindowGTK::OnInternalIdle()
1263 wxTopLevelWindowBase::OnInternalIdle();
1265 // Synthetize activate events.
1266 if ( g_sendActivateEvent
!= -1 )
1268 bool activate
= g_sendActivateEvent
!= 0;
1270 // if (!activate) wxPrintf( wxT("de") );
1271 // wxPrintf( wxT("activate\n") );
1274 g_sendActivateEvent
= -1;
1276 wxTheApp
->SetActive(activate
, (wxWindow
*)g_lastActiveFrame
);
1280 // ----------------------------------------------------------------------------
1282 // ----------------------------------------------------------------------------
1284 void wxTopLevelWindowGTK::SetTitle( const wxString
&title
)
1286 wxASSERT_MSG( (m_widget
!= NULL
), wxT("invalid frame") );
1288 if ( title
== m_title
)
1293 gtk_window_set_title( GTK_WINDOW(m_widget
), wxGTK_CONV( title
) );
1296 void wxTopLevelWindowGTK::SetIcons( const wxIconBundle
&icons
)
1298 wxASSERT_MSG( (m_widget
!= NULL
), wxT("invalid frame") );
1300 base_type::SetIcons(icons
);
1302 // Setting icons before window is realized can cause a GTK assertion if
1303 // another TLW is realized before this one, and it has this one as it's
1304 // transient parent. The life demo exibits this problem.
1305 if (gtk_widget_get_realized(m_widget
))
1308 for (size_t i
= icons
.GetIconCount(); i
--;)
1309 list
= g_list_prepend(list
, icons
.GetIconByIndex(i
).GetPixbuf());
1310 gtk_window_set_icon_list(GTK_WINDOW(m_widget
), list
);
1315 // ----------------------------------------------------------------------------
1316 // frame state: maximized/iconized/normal
1317 // ----------------------------------------------------------------------------
1319 void wxTopLevelWindowGTK::Maximize(bool maximize
)
1322 gtk_window_maximize( GTK_WINDOW( m_widget
) );
1324 gtk_window_unmaximize( GTK_WINDOW( m_widget
) );
1327 bool wxTopLevelWindowGTK::IsMaximized() const
1329 GdkWindow
* window
= NULL
;
1331 window
= gtk_widget_get_window(m_widget
);
1332 return window
&& (gdk_window_get_state(window
) & GDK_WINDOW_STATE_MAXIMIZED
);
1335 void wxTopLevelWindowGTK::Restore()
1337 // "Present" seems similar enough to "restore"
1338 gtk_window_present( GTK_WINDOW( m_widget
) );
1341 void wxTopLevelWindowGTK::Iconize( bool iconize
)
1344 gtk_window_iconify( GTK_WINDOW( m_widget
) );
1346 gtk_window_deiconify( GTK_WINDOW( m_widget
) );
1349 bool wxTopLevelWindowGTK::IsIconized() const
1351 return m_isIconized
;
1354 void wxTopLevelWindowGTK::SetIconizeState(bool iconize
)
1356 if ( iconize
!= m_isIconized
)
1358 m_isIconized
= iconize
;
1359 (void)SendIconizeEvent(iconize
);
1363 void wxTopLevelWindowGTK::AddGrab()
1368 gtk_grab_add( m_widget
);
1369 wxGUIEventLoop().Run();
1370 gtk_grab_remove( m_widget
);
1374 void wxTopLevelWindowGTK::RemoveGrab()
1383 bool wxTopLevelWindowGTK::IsActive()
1385 return (this == (wxTopLevelWindowGTK
*)g_activeFrame
);
1388 void wxTopLevelWindowGTK::RequestUserAttention(int flags
)
1390 bool new_hint_value
= false;
1392 // FIXME: This is a workaround to focus handling problem
1393 // If RequestUserAttention is called for example right after a wxSleep, OnInternalIdle
1394 // hasn't yet been processed, and the internal focus system is not up to date yet.
1395 // YieldFor(wxEVT_CATEGORY_UI) ensures the processing of it (hopefully it
1396 // won't have side effects) - MR
1397 wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI
);
1399 if(m_urgency_hint
>= 0)
1400 g_source_remove(m_urgency_hint
);
1402 m_urgency_hint
= -2;
1404 if( gtk_widget_get_realized(m_widget
) && !IsActive() )
1406 new_hint_value
= true;
1408 if (flags
& wxUSER_ATTENTION_INFO
)
1410 m_urgency_hint
= g_timeout_add(5000, (GSourceFunc
)gtk_frame_urgency_timer_callback
, this);
1412 m_urgency_hint
= -1;
1416 gtk_window_set_urgency_hint(GTK_WINDOW(m_widget
), new_hint_value
);
1419 void wxTopLevelWindowGTK::SetWindowStyleFlag( long style
)
1421 // Store which styles were changed
1422 long styleChanges
= style
^ m_windowStyle
;
1424 // Process wxWindow styles. This also updates the internal variable
1425 // Therefore m_windowStyle bits carry now the _new_ style values
1426 wxWindow::SetWindowStyleFlag(style
);
1428 // just return for now if widget does not exist yet
1432 if ( styleChanges
& wxSTAY_ON_TOP
)
1434 gtk_window_set_keep_above(GTK_WINDOW(m_widget
),
1435 m_windowStyle
& wxSTAY_ON_TOP
);
1438 if ( styleChanges
& wxFRAME_NO_TASKBAR
)
1440 gtk_window_set_skip_taskbar_hint(GTK_WINDOW(m_widget
),
1441 m_windowStyle
& wxFRAME_NO_TASKBAR
);
1445 bool wxTopLevelWindowGTK::SetTransparent(wxByte alpha
)
1447 GdkWindow
* window
= NULL
;
1449 window
= gtk_widget_get_window(m_widget
);
1453 #ifdef GDK_WINDOWING_X11
1454 Display
* dpy
= GDK_WINDOW_XDISPLAY(window
);
1455 Window win
= GDK_WINDOW_XID(window
);
1457 // Using pure Xlib to not have a GTK version check mess due to gtk2.0 not having GdkDisplay
1459 XDeleteProperty(dpy
, win
, XInternAtom(dpy
, "_NET_WM_WINDOW_OPACITY", False
));
1462 long opacity
= alpha
* 0x1010101L
;
1463 XChangeProperty(dpy
, win
, XInternAtom(dpy
, "_NET_WM_WINDOW_OPACITY", False
),
1464 XA_CARDINAL
, 32, PropModeReplace
,
1465 (unsigned char *) &opacity
, 1L);
1469 #else // !GDK_WINDOWING_X11
1471 #endif // GDK_WINDOWING_X11 / !GDK_WINDOWING_X11
1474 bool wxTopLevelWindowGTK::CanSetTransparent()
1476 // allow to override automatic detection as it's far from perfect
1477 const wxString SYSOPT_TRANSPARENT
= "gtk.tlw.can-set-transparent";
1478 if ( wxSystemOptions::HasOption(SYSOPT_TRANSPARENT
) )
1480 return wxSystemOptions::GetOptionInt(SYSOPT_TRANSPARENT
) != 0;
1484 return gtk_widget_is_composited(m_widget
) != 0;
1486 #if GTK_CHECK_VERSION(2,10,0)
1487 if (!gtk_check_version(2,10,0))
1489 return gtk_widget_is_composited(m_widget
) != 0;
1492 #endif // In case of lower versions than gtk+-2.10.0 we could look for _NET_WM_CM_Sn ourselves
1496 #endif // !__WXGTK3__
1498 #if 0 // Don't be optimistic here for the sake of wxAUI
1499 int opcode
, event
, error
;
1500 // Check for the existence of a RGBA visual instead?
1501 return XQueryExtension(gdk_x11_get_default_xdisplay (),
1502 "Composite", &opcode
, &event
, &error
);