Re: another GtkToggleButton signal question

[Neil Zanella <nzanella gmail com>]

Really, all of this should be documented.
It really is essential in not all but in several
cases to know when the signal is emitted
with respect to transitions of other widget
properties.

Thanks,

Neil

On Sun, 21 Nov 2004 22:16:51 -0600, James M. Cape <jcape ignore-your tv> wrote:
> On Sun, 2004-11-21 at 19:49 -0700, Neil Zanella wrote:
> 
> 
> > Hello,
> >
> > Can I also rely on the fact that if a GtkToggleButton is active then a
> > function call
> > to set its active state to TRUE is not going to trigger a signal. In
> > general, is it true
> > that signal handlers are invoked when properties are CHANGED BY A FUNCTION
> > OR USER ACTION, and not when a function causes the given property to remain
> > the same?
> 
> > In particular, if a toggle button state is true, then setting it to
> > true via a function
> > does not generate a signal. Is this concept true for GTK signals in general?
> 
> It depends entirely on the signal and property in question. For signals
> in GTK+ itself, generally yes (I don't know of a counter-example within
> libgdk/libgdk-pixbuf/libgtk offhand). Outside of GTK+ it depends
> entirely on the code given. GObject's "notify" signal, for example, is
> always emitted when set_property() is called (so "toggled" will only be
> fired when the "active" property has changed, whereas "notify::active"
> will be fired anytime someone calls 'g_object_set (button, "active",
> someval, NULL);'
> 
> --
> Peace,
> 
>     Jim Cape
>     http://esco.mine.nu
>     http://ignore-your.tv
> 
>     "If even one reporter had stood up during a pre-Iraq Bush press
>      conference last year and shouted, `Bullshit!' it might have made a
>      difference."
>         -- Matt Taibbi, New York Press
> 
> 
>