Re: [gtk-list] about key event of the Entry

[FOCUS gpf <jmiguel ceselsa es>]

Jiang XU wrote:

I use an GtkEntry to input numbers.  I try to make it won't accept other
keys except number keys, which means when the user pushes the other
keys, it won't shows up.

I use the signal call back function. What I am doing now is:
1.  set signal call back function (signal: key_release_event)
    if the input key is not a number key, then delete it.

But the thing is that the wrong key still will show up for a very short
time.  I know this is because I use the key_release_event signal.

So I try to put such function in the key_pressed_event.
The thing is : In the "key_pressed_event" call back function, if I
detect the wrong key, how I can prevent it from showing in the entry on
the screen?

If someone knows, please teach me ASAP

Thanks

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Try this:

  gtk_signal_connect (GTK_OBJECT (entry1), "key_press_event",
                      GTK_SIGNAL_FUNC (on_entry1_key_press_event),
                      NULL);
 

...

gboolean on_entry1_key_press_event(GtkWidget *wid, GdkEventKey *ev, gpointer data) {
 gint key = ev->keyval;

 if(key < '0' || key > '9') {
  fprintf(stderr, "No Numeric\n");
  gtk_signal_emit_stop_by_name(GTK_OBJECT(wid), "key_press_event");
  return(TRUE);
 }
 
 return(FALSE);
}
 

(I don't know if return values are used later ...)
 

Good luck.