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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