Re: Control user change of SpinButton value

["Josepo Urrutia" <find_all hotmail com>]

Sorry, I think I didn't explain the problem well enough.

> From: Murray Cumming <murrayc murrayc com>
> To: Robert Caryl <bob fis-cal com>
> CC: Nickolai Dobrynin <ndobrynin gmail com>,Josepo Urrutia 
> <find_all hotmail com>, gtkmm-list gnome org
> Subject: Re: Control user change of SpinButton value
> Date: Sun, 16 Jul 2006 10:19:50 +0200
>
> On Sat, 2006-07-15 at 10:49 -0500, Robert Caryl wrote:
> > Josepo wrote:
> > > I've some Gtk::SpinButton in my application and I need to control when 
> the user change the values of those spinbuttons.
> > >
> > > If I use the Gtk::SpinButton::signal_value_changed I can do a callback 
> whenever the value of a spinbutton is changed, the problem is that this 
> callback is also fired if the value is changed by the code not only by the 
> user.
> > >
> > > Using the Gtk::Entry::signal_activate makes me able to know when the 
> user has enter a value hitting the return key but not by using the mouse 
> over the "up/down" buttons.
> > >
> > > I've tried with some more signal has 
> Gtk::Widget::signal_button_release but no luck.
> > Evidently, Josepo wishes to prevent change of the Gtk::SpinButton
> > object's value by the user under certain circumstances.
>
> Can't he just use set_sensitive(false)?

What I need is to know if the change on a spinbutton has been solicited by 
the user or by the code.
If the change has been done by the user I need to execute some extra 
function that don't have to be
executed if the change has been done by the code.

Thats why I asked if there is a generic signal to a user modification of the 
spinbutton apart from
signal_value_change.


> >   The Gtk::SpinButton is, quoting the docs:  "a numeric Entry with
> > up/down buttons . . . "  To accomplish Josepo's stated purpose,
> > Nickolai proposes detection of an arrow key keypress by connecting to
> > Gtk::Widget::signal_key_press_event().  But what about when the user
> > merely enters numbers in the Gtk::Entry widget portion of the
> > Gtk::SpinButton;  or, what about when the user clicks on either of the
> > up or down buttons included in the Gtk::SpinButton?  To do it
> > Nickolai's way, Josepo must write callback slots to connect to every
> > possible access signal emitted by three widgets: the Gtk::Entry and
> > both of the Gtk::Button objects upon which the user can click with his
> > mouse to change the spin button value.  Ergo, using Nickolai's
> > methodology, in order to intercept the user in all the ways he could
> > change the spin button value Josepo must write at least three callback
> > slots connecting to at least three different widgets various signals.
> > Or, Josepo insert a total of seven lines of code necessary to
> > implement a mutex, splitting them between the constructor of his
> > class, his already written Gtk::SpinButton::signal_value_changed
> > callback slot, the function where he programmatically changes the
> > button value, and the destructor of his class; thereby accomplishing
> > his stated purpose.
> >
> > What was it Nickolai said?
> > > Btw, using a mutex for this purpose, as Bob had suggested, seems
> > > like a huge overkill to me.
> > I suppose one person's overkill is another person's simplicity.
> >
> > Bob Caryl
> >

Relax everybody, sarcasm is bad for health. :-)

> >
> > Nickolai Dobrynin wrote:
> > > Josepo,
> > >
> > > You can try connecting to Glib::SignalProxy1<bool,GdkEventKey*>
> > > Gtk::Widget::signal_key_press_event().
> > > The callback then is a good place to check whether it was an arrow
> > > key that got pressed.
> > >
> > > Btw, using a mutex for this purpose, as Bob had suggested, seems
> > > like a huge overkill to me.
> > >
> > >
> > > Regards,
> > >
> > > Nickolai
> > >
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> --
> Murray Cumming
> murrayc murrayc com
> www.murrayc.com
> www.openismus.com