motion-notify-event works only once

2007-06-27 Thread Jerome Blondel 
Hi,

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, or is it abnormal behaviour?

Thanks in advance








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Re: motion-notify-event works only once

2007-06-27 Thread 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.

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().

Yeti

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Re: motion-notify-event works only once

2007-06-27 Thread Jerome Blondel 

David Nečas (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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