SIGNALS

changed (Gtk2::Editable)

delete-text (Gtk2::Editable, integer, integer)

insert-text (Gtk2::Editable, string, integer, gpointer)

The "insert-text" signal handler can optionally alter the text to be inserted. It may

• Return no values for no change. Be sure to end with an empty "return".

      sub my_insert_text_handler {
        my ($widget, $text, $len, $pos, $userdata) = @_;
        print "inserting '$text' at char position '$pos'\n";
        return;  # no values
      }
  

• Return two values "($text, $pos)" which are the new text and character position.

      sub my_insert_text_handler {
        my ($widget, $text, $len, $pos, $userdata) = @_;
        return (uc($text), $pos);  # force to upper case
      }
  

• Return no values and modify the text in $_[1] and/or position in $_[3]. For example,

      sub my_insert_text_handler {
        $_[1] = uc($_[1]);   # force to upper case
        $_[3] = 0;           # force position to the start
        return;  # no values
      }
  

Note that currently in a Perl subclass of a "Gtk2::Editable" widget, a class closure (ie. class default signal handler) for "insert-text" does not work this way. It instead sees the C level "($text, $len, $pos_pointer)", where $pos_pointer is a machine address and cannot be used easily. Hopefully this will change in the future. A "signal_chain_from_overridden" with the args as passed works, but for anything else the suggestion is to use a "signal_connect" instead.