Re: _NET_WM_USER_TIME reconsidered

[Bill Haneman <Bill Haneman Sun COM>]

Thanks Matthias;

For some reason I was under the impression that this gdk function 
wouldn't do what we wanted, but I hadn't looked at the source code, so I 
was overlooking it.

As an aside, why isn't there a race in the setproperty/IfEvent code 
below? (You can answer me offline)

Bill

Matthias Clasen wrote:

> On Tue, 2006-09-26 at 17:58 +0200, Lubos Lunak wrote:
>  
>
> > Dne úterý 26 září 2006 12:21 Bill Haneman napsal(a):
> >    
> >
> > > Matthias/All:
> > >
> > > The whole _NET_WM_USER_TIME thing is a continuing problem for
> > > accessibility, as it now stands.  In an assistive technology setting,
> > > there isn't always an X event that corresponds to the "user action"
> > > which results in a new window being posted or focus changing.  Since X
> > > doesn't allow us to get a meaningful answer to "what's the current
> > > timestamp", we have serious problems when trying to interact with
> > > windows via non-X-device-based user requests.
> > >
> > > We really need a solution for this!
> > >      
> > Copy&paste from KApplication::updateUserTimestamp():
> >
> > // get current X timestamp
> > Window w = XCreateSimpleWindow( qt_xdisplay(), qt_xrootwin(), 0, 0, 1, 1, 0, 
> > 0, 0 );
> > XSelectInput( qt_xdisplay(), w, PropertyChangeMask );
> > unsigned char data[ 1 ];
> > XChangeProperty( qt_xdisplay(), w, XA_ATOM, XA_ATOM, 8, PropModeAppend, data, 
> > 1 );
> > XEvent ev;
> > XWindowEvent( qt_xdisplay(), w, PropertyChangeMask, &ev );
> > time = ev.xproperty.time;
> > XDestroyWindow( qt_xdisplay(), w );
> >
> >    
>
> Here is the gdk equivalent:
>
> guint32
> gdk_x11_get_server_time (GdkWindow *window)
> {
>  Display *xdisplay;
>  Window   xwindow;
>  guchar c = 'a';
>  XEvent xevent;
>  Atom timestamp_prop_atom;
>  g_return_val_if_fail (GDK_IS_WINDOW (window), 0);
>  g_return_val_if_fail (!GDK_WINDOW_DESTROYED (window), 0);
>  xdisplay = GDK_WINDOW_XDISPLAY (window);
>  xwindow = GDK_WINDOW_XWINDOW (window);
>  timestamp_prop_atom =
>    gdk_x11_get_xatom_by_name_for_display (GDK_WINDOW_DISPLAY (window),
>                                           "GDK_TIMESTAMP_PROP");
>  XChangeProperty (xdisplay, xwindow, timestamp_prop_atom,
>                   timestamp_prop_atom,
>                   8, PropModeReplace, &c, 1);
>  XIfEvent (xdisplay, &xevent,
>            timestamp_predicate, GUINT_TO_POINTER(xwindow));
>  return xevent.xproperty.time;
> }
>
> it is even exported, so you can just use it.
>
>
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