+
+// ----------------------------------------------------------------------------
+// Fullscreen mode:
+// ----------------------------------------------------------------------------
+
+// NB: Setting fullscreen mode under X11 is a complicated matter. There was
+// no standard way of doing it until recently. ICCCM doesn't know the
+// concept of fullscreen windows and the only way to make a window
+// fullscreen is to remove decorations, resize it to cover entire screen
+// and set WIN_LAYER_ABOVE_DOCK.
+//
+// This doesn't always work, though. Specifically, at least kwin from
+// KDE 3 ignores the hint. The only way to make kwin accept our request
+// is to emulate the way Qt does it. That is, unmap the window, set
+// _NET_WM_WINDOW_TYPE to _KDE_NET_WM_WINDOW_TYPE_OVERRIDE (KDE extension),
+// add _NET_WM_STATE_STAYS_ON_TOP (ditto) to _NET_WM_STATE and map
+// the window again.
+//
+// Version 1.2 of Window Manager Specification (aka wm-spec aka
+// Extended Window Manager Hints) introduced _NET_WM_STATE_FULLSCREEN
+// window state which provides cleanest and simplest possible way of
+// making a window fullscreen. WM-spec is a de-facto standard adopted
+// by GNOME and KDE folks, but _NET_WM_STATE_FULLSCREEN isn't yet widely
+// supported. As of January 2003, only GNOME 2's default WM Metacity
+// implements, KDE will support it from version 3.2. At toolkits level,
+// GTK+ >= 2.1.2 uses it as the only method of making windows fullscreen
+// (that's why wxGTK will *not* switch to using gtk_window_fullscreen
+// unless it has better compatiblity with older WMs).
+//
+//
+// This is what wxWindows does in wxSetFullScreenStateX11:
+// 1) if _NET_WM_STATE_FULLSCREEN is supported, use it
+// 2) otherwise try WM-specific hacks (KDE, IceWM)
+// 3) use _WIN_LAYER and hope that the WM will recognize it
+// The code was tested with:
+// twm, IceWM, WindowMaker, Metacity, kwin, sawfish, lesstif-mwm
+
+
+#define WIN_LAYER_NORMAL 4
+#define WIN_LAYER_ABOVE_DOCK 10
+
+static void wxWinHintsSetLayer(Display *display, Window rootWnd,
+ Window window, int layer)
+{
+ wxX11ErrorsSuspender noerrors(display);
+
+ XEvent xev;
+
+ wxMAKE_ATOM( _WIN_LAYER, display );
+
+ if (IsMapped(display, window))
+ {
+ xev.type = ClientMessage;
+ xev.xclient.type = ClientMessage;
+ xev.xclient.window = window;
+ xev.xclient.message_type = _WIN_LAYER;
+ xev.xclient.format = 32;
+ xev.xclient.data.l[0] = (long)layer;
+ xev.xclient.data.l[1] = CurrentTime;
+
+ XSendEvent(display, rootWnd, False,
+ SubstructureNotifyMask, (XEvent*) &xev);
+ }
+ else
+ {
+ long data[1];
+
+ data[0] = layer;
+ XChangeProperty(display, window,
+ _WIN_LAYER, XA_CARDINAL, 32,
+ PropModeReplace, (unsigned char *)data, 1);
+ }
+}
+
+
+
+#ifdef __WXGTK20__
+static bool wxQueryWMspecSupport(Display* WXUNUSED(display),
+ Window WXUNUSED(rootWnd),
+ Atom (feature))
+{
+ GdkAtom gatom = gdk_x11_xatom_to_atom(feature);
+ return gdk_net_wm_supports(gatom);
+}
+#else
+static bool wxQueryWMspecSupport(Display *display, Window rootWnd, Atom feature)
+{
+ wxMAKE_ATOM(_NET_SUPPORTING_WM_CHECK, display);
+ wxMAKE_ATOM(_NET_SUPPORTED, display);
+
+ // FIXME: We may want to cache these checks. Note that we can't simply
+ // remember the results in global variable because the WM may go
+ // away and be replaced by another one! One possible approach
+ // would be invalidate the case every 15 seconds or so. Since this
+ // code is currently only used by wxTopLevelWindow::ShowFullScreen,
+ // it is not important that it is not optimized.
+ //
+ // If the WM supports ICCCM (i.e. the root window has
+ // _NET_SUPPORTING_WM_CHECK property that points to a WM-owned
+ // window), we could watch for DestroyNotify event on the window
+ // and invalidate our cache when the windows goes away (= WM
+ // is replaced by another one). This is what GTK+ 2 does.
+ // Let's do it only if it is needed, it requires changes to
+ // the event loop.
+
+ Atom type;
+ Window *wins;
+ Atom *atoms;
+ int format;
+ unsigned long after;
+ unsigned long nwins, natoms;
+
+ // Is the WM ICCCM supporting?
+ XGetWindowProperty(display, rootWnd,
+ _NET_SUPPORTING_WM_CHECK, 0, LONG_MAX,
+ False, XA_WINDOW, &type, &format, &nwins,
+ &after, (unsigned char **)&wins);
+ if ( type != XA_WINDOW || nwins <= 0 || wins[0] == None )
+ return FALSE;
+ XFree(wins);
+
+ // Query for supported features:
+ XGetWindowProperty(display, rootWnd,
+ _NET_SUPPORTED, 0, LONG_MAX,
+ False, XA_ATOM, &type, &format, &natoms,
+ &after, (unsigned char **)&atoms);
+ if ( type != XA_ATOM || atoms == NULL )
+ return FALSE;
+
+ // Lookup the feature we want:
+ for (unsigned i = 0; i < natoms; i++)
+ {
+ if ( atoms[i] == feature )
+ {
+ XFree(atoms);
+ return TRUE;
+ }
+ }
+ XFree(atoms);
+ return FALSE;
+}
+#endif
+
+
+#define _NET_WM_STATE_REMOVE 0
+#define _NET_WM_STATE_ADD 1
+
+static void wxWMspecSetState(Display *display, Window rootWnd,
+ Window window, int operation, Atom state)
+{
+ wxMAKE_ATOM(_NET_WM_STATE, display);
+
+ if ( IsMapped(display, window) )
+ {
+ XEvent xev;
+ xev.type = ClientMessage;
+ xev.xclient.type = ClientMessage;
+ xev.xclient.serial = 0;
+ xev.xclient.send_event = True;
+ xev.xclient.display = display;
+ xev.xclient.window = window;
+ xev.xclient.message_type = _NET_WM_STATE;
+ xev.xclient.format = 32;
+ xev.xclient.data.l[0] = operation;
+ xev.xclient.data.l[1] = state;
+ xev.xclient.data.l[2] = None;
+
+ XSendEvent(display, rootWnd,
+ False,
+ SubstructureRedirectMask | SubstructureNotifyMask,
+ &xev);
+ }
+ // FIXME - must modify _NET_WM_STATE property list if the window
+ // wasn't mapped!
+}
+
+static void wxWMspecSetFullscreen(Display *display, Window rootWnd,
+ Window window, bool fullscreen)
+{
+ wxMAKE_ATOM(_NET_WM_STATE_FULLSCREEN, display);
+ wxWMspecSetState(display, rootWnd,
+ window,
+ fullscreen ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE,
+ _NET_WM_STATE_FULLSCREEN);
+}
+
+
+// Is the user running KDE's kwin window manager? At least kwin from KDE 3
+// sets KWIN_RUNNING property on the root window.
+static bool wxKwinRunning(Display *display, Window rootWnd)
+{
+ wxMAKE_ATOM(KWIN_RUNNING, display);
+
+ long *data;
+ Atom type;
+ int format;
+ unsigned long nitems, after;
+ if (XGetWindowProperty(display, rootWnd,
+ KWIN_RUNNING, 0, 1, False, KWIN_RUNNING,
+ &type, &format, &nitems, &after,
+ (unsigned char**)&data) != Success)
+ {
+ return FALSE;
+ }
+
+ bool retval = (type == KWIN_RUNNING &&
+ nitems == 1 && data && data[0] == 1);
+ XFree(data);
+ return retval;
+}
+
+// KDE's kwin is Qt-centric so much than no normal method of fullscreen
+// mode will work with it. We have to carefully emulate the Qt way.
+static void wxSetKDEFullscreen(Display *display, Window rootWnd,
+ Window w, bool fullscreen, wxRect *origRect)
+{
+ long data[2];
+ unsigned lng;
+
+ wxMAKE_ATOM(_NET_WM_WINDOW_TYPE, display);
+ wxMAKE_ATOM(_NET_WM_WINDOW_TYPE_NORMAL, display);
+ wxMAKE_ATOM(_KDE_NET_WM_WINDOW_TYPE_OVERRIDE, display);
+ wxMAKE_ATOM(_NET_WM_STATE_STAYS_ON_TOP, display);
+
+ if (fullscreen)
+ {
+ data[0] = _KDE_NET_WM_WINDOW_TYPE_OVERRIDE;
+ data[1] = _NET_WM_WINDOW_TYPE_NORMAL;
+ lng = 2;
+ }
+ else
+ {
+ data[0] = _NET_WM_WINDOW_TYPE_NORMAL;
+ data[1] = None;
+ lng = 1;
+ }
+
+ // it is neccessary to unmap the window, otherwise kwin will ignore us:
+ XSync(display, False);
+
+ bool wasMapped = IsMapped(display, w);
+ if (wasMapped)
+ {
+ XUnmapWindow(display, w);
+ XSync(display, False);
+ }
+
+ XChangeProperty(display, w, _NET_WM_WINDOW_TYPE, XA_ATOM, 32,
+ PropModeReplace, (unsigned char *) &data, lng);
+ XSync(display, False);
+
+ if (wasMapped)
+ {
+ XMapRaised(display, w);
+ XSync(display, False);
+ }
+
+ wxWMspecSetState(display, rootWnd, w,
+ fullscreen ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE,
+ _NET_WM_STATE_STAYS_ON_TOP);
+ XSync(display, False);
+
+ if (!fullscreen)
+ {
+ // NB: like many other WMs, kwin ignores first request for window
+ // position change after the window was mapped. This additional
+ // move+resize event will ensure that the window is restored in
+ // exactly same position as before it was made fullscreen (because
+ // wxTopLevelWindow::ShowFullScreen will call SetSize, thus
+ // setting the position for second time).
+ XMoveResizeWindow(display, w,
+ origRect->x, origRect->y,
+ origRect->width, origRect->height);
+ XSync(display, False);
+ }
+}
+
+
+wxX11FullScreenMethod wxGetFullScreenMethodX11(WXDisplay* display,
+ WXWindow rootWindow)
+{
+ Window root = (Window)rootWindow;
+ Display *disp = (Display*)display;
+
+ // if WM supports _NET_WM_STATE_FULLSCREEN from wm-spec 1.2, use it:
+ wxMAKE_ATOM(_NET_WM_STATE_FULLSCREEN, disp);
+ if (wxQueryWMspecSupport(disp, root, _NET_WM_STATE_FULLSCREEN))
+ {
+ wxLogTrace(_T("fullscreen"),
+ _T("detected _NET_WM_STATE_FULLSCREEN support"));
+ return wxX11_FS_WMSPEC;
+ }
+
+ // if the user is running KDE's kwin WM, use a legacy hack because
+ // kwin doesn't understand any other method:
+ if (wxKwinRunning(disp, root))
+ {
+ wxLogTrace(_T("fullscreen"), _T("detected kwin"));
+ return wxX11_FS_KDE;
+ }
+
+ // finally, fall back to ICCCM heuristic method:
+ wxLogTrace(_T("fullscreen"), _T("unknown WM, using _WIN_LAYER"));
+ return wxX11_FS_GENERIC;
+}
+
+
+void wxSetFullScreenStateX11(WXDisplay* display, WXWindow rootWindow,
+ WXWindow window, bool show,
+ wxRect *origRect,
+ wxX11FullScreenMethod method)
+{
+ // NB: please see the comment under "Fullscreen mode:" title above
+ // for implications of changing this code.
+
+ Window wnd = (Window)window;
+ Window root = (Window)rootWindow;
+ Display *disp = (Display*)display;
+
+ if (method == wxX11_FS_AUTODETECT)
+ method = wxGetFullScreenMethodX11(display, rootWindow);
+
+ switch (method)
+ {
+ case wxX11_FS_WMSPEC:
+ wxWMspecSetFullscreen(disp, root, wnd, show);
+ break;
+ case wxX11_FS_KDE:
+ wxSetKDEFullscreen(disp, root, wnd, show, origRect);
+ break;
+ default:
+ wxWinHintsSetLayer(disp, root, wnd,
+ show ? WIN_LAYER_ABOVE_DOCK : WIN_LAYER_NORMAL);
+ break;
+ }
+}
+
projects / wxWidgets.git / blobdiff