Arkadi Viner wrote:
> 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 ?
No. With the "delegate" keyword you define a type for functions. So
public delegate bool SourceFunc ();
means that the type 'SourceFunc' will represent all functions with no
parameters and a boolean return value. When Timeout.add() expects a
SourceFunc as second parameter this means that you can pass any function
with no parameters and a boolean return value as a parameter.
I have attached a compiling version of your code. As Jan has pointed out
your callback functions must be inside the class (especially since they
access 'timerID'). Make sure that you add the 'my_app_' prefix to your
callback functions in Glade:
my_app_on_btnActivate_clicked
my_app_on_btnDeactivate_clicked
These will be the C names of the functions.
Best Regards,
Frederik
using Gtk;
public class MyApp {
private Window window;
private uint timerID;
public MyApp () throws Error {
var builder = new Builder ();
builder.add_from_file ("gui.ui");
builder.connect_signals (this);
this.window = builder.get_object ("win_main") as Window;
this.window.destroy += Gtk.main_quit;
}
public void run () {
this.window.show_all ();
Gtk.main ();
}
//This should activate the timer.
[CCode (instance_pos = -1)]
public void on_btnActivate_clicked (Button source) {
timerID = Timeout.add (1000, on_timer_event);
}
//This should deactivate the timer..
[CCode (instance_pos = -1)]
public void on_btnDeactivate_clicked (Button source) {
Source.remove (timerID);
}
//Timer listener
public bool on_timer_event () {
stdout.printf ("timer event");
return true;
}
}
int main (string[] args) {
Gtk.init (ref args);
try {
var app = new MyApp ();
app.run ();
} catch (Error e) {
stderr.printf ("Could not load UI: %s\n", e.message);
return 1;
}
return 0;
}
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