Re: [Vala] timers with callbacks



On Tue, 2008-06-17 at 19:59 +0100, Sam Liddicott wrote:
I've grep'd all my vapi files and can't find any timer classes that 
provide callbacks, can anyone help?
I've seen the example at: http://live.gnome.org/Vala/Tutorial
but O'm just running Gtk.main, not making a loop, so I don't have 
anything to time.attach to.

Gtk.main uses a mainloop, so you can use something as follows:

        Timeout.add (interval, callback);

I've also modified the vala glade demo to make connect_signals more 
reasonable:

        if (!module.symbol ("glade_phone_ui_" + handler_name, out sym) 
&& !module.symbol (handler_name, out sym)) {

Of course "glade_phone_ui" is my namespace hierachy, but is there a 
magical preprocessor token to pull out the current namespace hierachy 
prefix to save me hard wiring it? That would be a reasonable change to 
the glade example.

No, that's not possible at the moment. It would be nice if we find a
convenient solution for this - I'd focus on GtkBuilder instead of Glade,
though.

Finally, (cos I'm an old Delphi nut) I want to extend the 
connect_signals stuff to connect more than signals, but also widget 
names, so I'll be pulling back all widget names, and then looking for 
exported symbols in a similar manner; however I guess I should be doing 
some RTTI stuff to make sure the symbol I'm about to populate is of the 
right types. Any clues?? I'll do it typeless for now.


I'm annoyed that this C syntax isn't supported:
        if (this.module = Module.open (null, ModuleFlags.BIND_LAZY)) {

That's by design, if expects a boolean condition and this.module is
certainly not a boolean.

However this doesn't work either:
        if ((this.module = Module.open (null, 
ModuleFlags.BIND_LAZY))!=NULL) {

I've not managed to find the equivalent for NULL checking yet. (This was 
to save re-opening module for every attached signal).

`NULL' in C is `null' in Vala

Jürg
-- 
Jürg Billeter <j bitron ch>




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