Re: how to connect Gio::SimpleAction signal

[Marty Moore <memoore gunnison com>]

Hi Daniel, Thanks for your replay.
I found two things while perusing the documentation:
1. I nedd to connect either the signal_activate or signal_state_changed
of the SimpleAction if I don't want default behavior.
2. There's a 'TODO' note saying that documentation is needed about how
to connect the signals.

I'm still playing around with things, but what I really need is a
tutorial about how to use Variant/BariantBase. I'm getting stuck every
time I run into it. There doesn't seem to be much explanation about
it. I assumed it was along the lines of void*, where you can use it for
any data type. Is there something to explain how to use it? A good
example about this stuff would really be appreciated.
Thanks for your help,
Marty


On Fri, 2017-12-15 at 10:08 +0000, Daniel Boles wrote:
> The idea I have is that, rather than specifically handling a click on
> the menu item, you just set an action that is to be invoked whenever
> the menu item is activated.
>
> Then GIO/GTK+ handle making clicks, pressing Enter, etc on the item
> invoke that action - so you don't have to worry about handling those
> low-level events manually.
>
> So you won't be tying click handlers to actions or anything: you just
> set the action on the menu item, and then you get standard click/key
> handlers for free, which activate the action when the menu item is
> activated.
>
> What you do with the VariantBase in the action callback is to cast it
> to whatever type you know it has. That is the type of your action and
> therefore your menu item: bool for toggles, int or string for radio
> actions, etc. So something like
>
> void
> on_action_activated(Glib::VariantBase const& variant)
> {
>   auto the_boolean =
> Glib::Variant<bool>::cast_dynamic(variant).get();
>   do_something_with(the_boolean);
> }
>
> I don't have a more specific example to hand, but this is the general
> idea of how I would ahndle it.
>
>
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