RE: How to enter a floating-point number ?

["Tom Liu" <tom liu flextrade com>]

Example 3. Forcing entry to uppercase.

include <ctype.h>

void
insert_text_handler (GtkEditable *editable,
                     const gchar *text,
                     gint         length,
                     gint        *position,
                     gpointer     data)
{
  int i;
  gchar *result = g_new (gchar, length);

  for (i = 0; i < length; i++)
    result[i] = islower (text[i]) ? toupper (text[i]) : text[i];

  g_signal_handlers_block_by_func (GTK_OBJECT (editable), 
                                   insert_text_handler, data);
  gtk_editable_insert_text (editable, result, length, position);
  g_signal_handlers_unblock_by_func (GTK_OBJECT (editable), 
                                     insert_text_handler, data);

  g_signal_stop_emission_by_name (GTK_OBJECT (editable), "insert_text");


  g_free (result);
}


> -----Original Message-----
> From: gtk-app-devel-list-bounces gnome org [mailto:gtk-app-devel-list-
> bounces gnome org] On Behalf Of Tristan Van Berkom
> Sent: Wednesday, May 26, 2004 4:16 PM
> To: Gan3sh
> Cc: gtk-app-devel-list gnome org
> Subject: Re: How to enter a floating-point number ?
>
> Gan3sh wrote:
> > Hi,
> >
> > I would like to add a widget in my application to be able to enter a
> > floating-point number and only that.
> > If I use a GtkEntry, I didn't see in the doc how to restrict the
> > available characters to only digits (and also . + -).
> > And if I use a GtkSpinButton, I didn't see how to set the arrows
> > unvisible.
> >
> > Is there another widget for entering only a number ?
>
> Hmmm,
>      I dont think this should be in the gtk+ domain.
> Why not just use a GtkEntry and use string conversion utilities
> (i.e. isdigit() or some varient) ?
>
> You can preemptivly deny some charachters input by catching
> the GdkEventKey's (i.e. "key-press-event" on the GtkWidget object)
> in advance and returning TRUE if you dont want that key to be
> processed (i.e. if you dont want the GtkEntry's handler to be called).
>
> Cheers,
>                                            -Tristan
>
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