Re: GTK+3 motion events and is_hint
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Re: GTK+3 motion events and is_hint
This is a good question, actually I haven't used this feature since GTK+2... I'd be curious to know the answer but here is my input anyway. Your application doesn't do much between is_hint events, so it could be that if you were slow handling the hint events, you might receive events that are not 'is_hint' in between the regular 'is_hint' events. FWIW, I don't think you should be concerned about which events are 'is_hint' or not 'is_hint'. Rather, the hint mask traditionally prevents you from receiving too many motion events that are queued up while your widget is processing a previous event, and the call to gdk_event_request_motions() tells GDK that your GdkWindow is ready to handle more motion events. Actually, I don't see why you should be trying to handle the 'is_hint' events any differently from the normal events (it should be enough to just call gdk_event_request_motions() at the end of a motion-notify-event handler, after you're done processing the event). Cheers, -Tristan On Fri, May 17, 2013 at 6:15 PM, Donn donn.in...@gmail.com wrote: Anyone? \d ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: GTK+3 motion events and is_hint
On 17/05/2013 11:29, Tristan Van Berkom wrote: This is a good question, actually I haven't used this feature since GTK+2... I'd be curious to know the answer but here is my input anyway. Tristan, Thanks so much for responding. I will try your suggestions and perhaps clarity will come in time. I do think it's a GTK+3 quirk. In the meantime, I will keep coding - better to aim for finished than perfect. \d ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
GTK+3 motion events and is_hint
Hi,
(Like in idiot I sent the first version of this to the wrong list!)
Hi, I'm new to GTK (and Vala). This is a Gtk+3.x question.
Can anyone explain why the event-is_hint always seems to return 1?
AFAICT the HINT_MASK is supposed to reduce the number of motion events
*and* send the occasional is_hint==true too.
ref: https://developer.gnome.org/gdk3/stable/gdk3-Events.html#GdkEventMask
I include a small vala sample at end. The motion_notify_event handler
never gets the chance to follow the else. i.e.
Am I grokking this wrong, or making a stupid mistake or .. other?
--
//valac --pkg gtk+-3.0 appname.vala
using Cairo;
namespace Demo {
public class Scribble : Gtk.DrawingArea {
public Scribble () {
this.add_events ( Gdk.EventMask.POINTER_MOTION_MASK |
Gdk.EventMask.POINTER_MOTION_HINT_MASK );
this.set_size_request (100,100);
}
private void draw_circ ( Cairo.Context cr ) {
var y = get_allocated_height () / 2;
var radius = double.min (get_allocated_width () / 2,
get_allocated_height () / 2) - 5;
cr.arc (y, y, radius, 0, 2 * Math.PI);
cr.set_source_rgb (1, 1, 1);
cr.fill_preserve ();
cr.set_source_rgb (0, 0, 0);
cr.stroke ();
}
public override bool draw ( Cairo.Context cr ) {
this.draw_circ ( cr);
return false;
}
public override bool motion_notify_event (Gdk.EventMotion event ) {
//Seems event.is_hint is *always* 1
//stdout.printf ( is_hint: %d\n, event.is_hint );
if (event.is_hint == 1) {
stdout.printf ( is hint\n );
Gdk.Event.request_motions(event); //Always 1, so what's the point?
} else {
//Never gets here. Why?
stdout.printf ( normal motion at: %G, %G\n, event.x, event.y );
}
return true; //false does not change anything either.
}
}
}
int main ( string[] args ) {
Gtk.init ( ref args );
var window = new Gtk.Window ();
var scribble = new Demo.Scribble ();
window.add (scribble);
window.show_all ();
window.destroy.connect (Gtk.main_quit);
Gtk.main ();
return 0;
}
--
PS - I have since asked this on Stackoverflow.
The url is:
http://stackoverflow.com/questions/16359775/gtk-motion-notify-event-is-hint-always-true
Thanks,
\d
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