Re: motion-notify-event works only once

[Jerome Blondel <jeromeblondel yahoo fr>]

David NeÄas (Yeti) :
> On Wed, Jun 27, 2007 at 05:46:57PM +0200, Jerome Blondel wrote:
>   
> > I've set up a motion-notify-event handler in a GtkDrawingArea, adding 
> > the POINTER_MOTION and POINTER_MOTION_HINT event masks to the widget. 
> > The event is triggered only when the pointer moves into the window. I'd 
> > like to receive an event for each movement of the pointer. Is there 
> > something I might have missed,
> >     
>
> Yes, the fact that no one knows what your code really does
> if you don't post it.
>
>   
Sorry, I should have posted the code for the event handler. Indeed I 
didn't handle the hint correctly.

> Anyway, this works:
>
> ====================================================
> #include <gtk/gtk.h>
>
> static gboolean
> motion(GtkWidget *area,
>        GdkEventMotion *event)
> {
>     if (event->is_hint) {
>         gint x, y;
>
>         gdk_window_get_pointer(area->window, &x, &y, NULL);
>         g_print("Motion (hint): %d %d\n", x, y);
>     }
>     else
>         g_print("Motion: %g %g\n", event->x, event->y);
>
>     return FALSE;
> }
>
> int
> main(int argc, char *argv[])
> {
>     GtkWidget *window, *area;
>
>     gtk_init(&argc, &argv);
>
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
>
>     area = gtk_drawing_area_new();
>     gtk_widget_add_events(area,
>                           GDK_POINTER_MOTION_MASK
>                           | GDK_POINTER_MOTION_HINT_MASK);
>     gtk_container_add(GTK_CONTAINER(window), area);
>     g_signal_connect(area, "motion-notify-event", G_CALLBACK(motion), NULL);
>
>     gtk_widget_show_all(window);
>     gtk_main();
>
>     return 0;
> }
> ====================================================
>
> The thing you *possibly* forgot is to call
> gdk_window_get_pointer() which you have to as you explicitly
> asked -- by using GDK_POINTER_MOTION_HINT_MASK -- not to get
> any further events until you call gdk_window_get_pointer().
>   








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