Antonio Coralles wrote:
Antonio
Coralles wrote:
I just was thinking about the most elegant
way of restricting the chars
a user can enter into a Gtk::Entry. At first i thought I should do that
by overriding on_changed() but then, after looking at the dokumentation
for Gtk::Editable the functions
virtual void insert_text_vfunc (const Glib::ustring& text,
int& position)
virtual void on_insert_text (const Glib::ustring& text, int*
position)
caught my attention. The problem is that these functions are
completeley
undocumented - especially I don't understand what i should do with
int&
/ int* position - what happens when i change the value of
position/*position ? Are these functions at least suitable for my
purpose ? Should i call [when overriding] the base class routines if i
want a char to be accepted and avoid that if i don't want that ?
Ok, after experimenting a bit I achieved what I wanted to do by
overriding insert_text_vfunc. text is the text which would be inserted
and position the position where inserting starts - which can be
modified through &. If I want the insertion to take place I call
the base class insert_text_vfunc. Eventually I can pass a modified
string to that method ...
So the question that remains is what on_insert_text is for and why does
it use int* instead of int& ?
Antonio
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Hello Antonio,
I needed a Gtk::Entry object that behaved the same way, so I derived a
class I called "MaskedEntry." from Gtk::Entry. I added a gchar
pointer as a protected class variable, and as a formal paramter to the
contructor I passed a pointer to a gchar string containing all the
characters that I wanted to mask out of the entry. The constructor
makes a copy of this string with g_strdup. My class overrides the
"on_key_press_event" such that it uses gdk_keyval_to_unicode on the
event->keyval argument to convert it to a unicode value and then
uses strchr to see if that character is in the mask string. If it is
not, Gtk::Entry::on_key_press_event( event ) is called, passing the
original argument along to the framework. If, however, the character
does exist in the mask string, I put up a Gtk::MessageDialog informing
the user that the input character is not allowed as valid entry and
return without calling GtK::on_key_press_event.
Because all this happens before any characters are inserted into the
text of the entry, it is neat and clean.
--
Robert
L Caryl Jr
Fiscal
Systems, Inc.
256-772-8920 Ext. 108
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