Determining the width of a GtkTextView in characters

[Eduardo M KALINOWSKI <ekalin bol com br>]

Hi,

    I have a GtkTextView whose contents is all in one font, a monospaced
font by the way. I want to know the width of the GtkTextView in
characters, that is, how many characters fit in a line. I've tried a
code like this:

  GtkAllocation         allocation;
  PangoFont            *font;
  PangoFontDescription *fontdesc;
  PangoFontMetrics     *metrics;
  int                   char_width;

  allocation = GTK_WIDGET(txtView)->allocation;

  /* Actually loads the correct font, stored in a variable */
  fontdesc = pango_font_description_from_string("Monospace 10");
  font =
pango_context_load_font(gtk_widget_get_pango_context(GTK_WIDGET(txtView)),
                                fontdesc);
  metrics = pango_font_get_metrics(font, NULL);


  char_width =
PANGO_PIXELS(pango_font_metrics_get_approximate_char_width(metrics));
  columns  = allocation.width / char_width;


However, the value of columns is smaller than the real value. For
example, with a width of 80 characters, the value returned is 71. How
can I do that?

-- 
Marriage, n.:
        The evil aye.

Eduardo M KALINOWSKI
ekalin bol com br
http://move.to/hpkb