Re: tracking mouse pointer

[Paul Pogonyshev <pogonyshev gmx net>]

Tom Liu wrote:
> This is my test program to handle the motion, the event->state tell you
> the key sataus like shift or ctrl.
>
>
> gboolean    butt_motion(GtkWidget *widget, GdkEventMotion *event,
> gpointer user_data)
> {
>         printf("buttonmotion:%s,%x\n",user_data,event->state);
>         int x, y;
>         GdkModifierType state;
>         gdk_window_get_pointer (event->window, &x, &y, &state);
>
>         return TRUE;
> }

This is wonderful, but you should have read my message more attentively.
I didn't say it didn't work completely.  I said this:

> > First of all, i would like it to provide feedback when the window containing
> > the widget is "popped" (i.e shown, deiconified, or maybe shown together
> > with its desktop etc.)  I tried to make "show", "map" or "enter-notify-event"
> > callbacks to call gtk_widget_get_pointer() and use its information, but
> > either that didn't work at all, or the coordinates were wrong.  Any ideas?
> >
> > Another problem is that i use modifier keys (like Shift) to alter the action
> > performed.  This would in turn alter the feedback depending on currently
> > pressed keys.  However, i have to use events like "key-(press|release)-event"
> > instead of "motion-notify-event" (one can (de)press Shift without touching
> > his mouse) and those events report "lagged" modifiers.  I.e. event structure
> > for a "key-press-event" for Shift would still claim that Shift is depressed.
> > Is there some way to get proper modifiers, or do i have to do that by
> > hands?

Let me rephrase.

1) A window is shown in such a way that the pointer is over my widget.  What
   signal(s) do i connect to in order to make sure i update visual feedback
   properly in such cases?  Maybe "visibility-notify-event"?  What is it, btw?
   I can't see any description in GTK+ reference.

2) The user presses Shift key.  Is there a signal i could connect to and receive
   modifier flags with GDK_SHIFT_MASK set?

   For "key-press-event" it is set only after the event is propagated.  I used
   this callback for both "key-press-event" and "key-release-event":

        static gboolean
        gtk_goban_key_event(GtkWidget *widget, GdkEventKey *event)
        {
          if (event->type == GDK_KEY_PRESS) {
            parent_class->key_press_event(widget, event);
            g_print("press: %x\n", event->state);
          }
          else {
            parent_class->key_release_event(widget, event);
            g_print("release: %x\n", event->state);
          }

          return FALSE;
        }

   If i press and release Shift, i get "press: 10", "release: 11".  That is,
   GDK_SHIFT_MASK is set for _release_ event, while i would certainly like it
   the way round.

Paul Pogonyshev