Re: [Vala] Setting up a timer with callback event

[Arkadi Viner <arkashkin gmail com>]

My code doesn't compile and the problem is:

main.vala:77.10-77.19: error: syntax error, expected `('
<b>Process return 256  execution time: 0.729512 s</b>

and it points on the lines:
public delegate bool
<http://references.valadoc.org/glib-2.0/bool.html>SourceFunc
(){

return true;
}

I don't sure what is 'delegate' for but I tried to look for the correct
callback function for a timer
in valadoc and I found:
http://references.valadoc.org/glib-2.0/GLib.SourceFunc.html
It looks like this:
"public delegate bool
<http://references.valadoc.org/glib-2.0/bool.html>SourceFunc
();"
so, that's why I have wrote "delegate" for....
So I don't need this "delegate" in my code ?


My code is very large and because of that, I don't think it will be a good
idea to post it here...
I have posted here just a basic structure of my program so somebody could
tell me how
to implement a timer in a correct way.
If some body could just post me some simple example of a timer with a
callback function, that would be really great...



2009/8/19 Jan Hudec <bulb ucw cz>

> Hello,
>
> On 19 August 2009, 14:24, Arkadi Viner wrote:
> > I want to write some animation in my program.
> > I want to be able to activate it or cancel it where ever I want.
> > My basic program structure looks like this:
>
> You should describe your status if you want to get useful advice. Like
> mention what is failing.
>
> > using Gtk;
> >
> > public class MyApp {
> > [...]
> > }
> >
> > //This should activate the timer.
> >   [CCode (instance_pos = -1)]
>
> It must be an instance method to have an instance pos. So it must be inside
> the class.
>
> >   public void on_btnActivate_clicked (Button source) {
> > [...]
> >
> > //Timer listener
> > [CCode (instance_pos = -1)]
> > public delegate bool SourceFunc ()
>
> This makes no sense. 'delegate' defines a delegate *type*, but you are
> defining a function here.
>
> Oh, and you don't need instance_pos = -1 when you connect things yourself,
> because vala will create appropriate wrapper automatically. It is only
> needed
> for the Builder.connect case, where it cannot know to create them.
>
> > I need help to fix this code so I can setup a timer properly....
> > I don't sure what is wrong with my code....
>
> It's hard to help you when you didn't write whether you have compilation
> problems, or wheter Gtk.Builder is complaining that it cannot connect
> something or what.
>
> --
>                                        - Jan Hudec <bulb ucw cz>