Re: [Vala] signals

["D.H. Bahr" <dbahr uci cu>]

Victor,

truth is I don't have the code on me right now and I won't have access
to my email during the weekend 'cause I can only use the connexion at
work.

The code (at least the relevant part) looks kinda this (I promise I'll
send the actual one on monday):

class UIBuilder : Object {
  private Gtk.Builder builder
  private string gui = "my_ui.ui"
  ...
  public UIBuilder () {
    builder = new Gtk.Builder ();
  }
  ...
  public add_object (string obj) {
    builder.add_object_from_file(obj, gui); 
/*
not sure that's the proper method but I think you'll get what I mean
*/
  }
  ...
}

class Item : Object {
  private string name;
  ...
  private UIBuilder builder;
  ...
  private Gtk.Button ok_button;
  private Gtk.Button rm_button;
  public Gtk.Box box;
  ...
  public signal void ok_button_clicked (string name);
  public signal void rm_button_clicked (string name);
  ...
  public Item (string n) {
    name = n;

    builder = new UIBuilder();
    builder.add_object("item_box");

    box = builder.get_object("item_box") as Gtk.Box;

    ok_button = builder.get_object("ok_button") as Gtk.Button;
    ok_button.clicked.connect ( () => ok_button_clicked (name));

    rm_button = builder.get_object("ok_button") as Gtk.Button;
    rm_button.clicked.connect ( () => rm_button_clicked (name));
  }
}

class ItemsViewport : Object {
  private string[] names;  
  private UIBuilder builder;
  ...
  private Gtk.Grid grid;

  public ItemsViewport () {
    builder = new UIBuilder();
    builder.add_object ("items_viewport");
    
    grid = builder.get_object("item_grid") as Gtk.Grid;
    ...
    init();
  } 
  
  private void init () {
    Item item;
    foreach (string name in names) {
      item = new Item (name);
      grid.attach (item, ...);
      item.ok_button_clicked.connect (on_ok_button_clicked);
      item.rm_button_clicked.connect (on_ok_button_clicked);
    }
  }
  ...

  private void on_ok_button_clicked (string name) {
    stdout.printf ("OK Button for item %s was clicked.\n", name);
  }

  private void on_rm_button_clicked (string name) {
    stdout.printf ("RM Button for item %s was clicked.\n", name);
  }
  ...
}

Of course those are (mostly) not the actual variable names but is the
general idea of what I am trying to do. I recall trying to use the 'ok'
and 'rm' buttons as public and connecting directly to their own signals
but then valac would not compile.

As I said earlier I promise I'll send the actual code on monday morning.

Best regards and thanks for your concern,

D.H. Bahr

On Fri, 2012-09-07 at 19:07 -0006, Victor wrote:
> Could you please paste the code somewhere, so we can try to spot the
> errors?
>
> This part grabs my attention:
> > I tried using vala native signals on the box-ish class emitted when
> the 
> > buttons where clicked an then connect those signals in the grid-ish 
> > class, but nothing seems to happen. 
>
> From what you wrote there, I guess the button instances are public
> fields in the box class. For handling click events, you have two
> options: use lambda functions and access local data from there, or use
> a single "generic" handler for all the buttons.
>
>
> 1) Lambda:  my_button.clicked.connect ( () => { // do something...
>  });
>
>
> 2) Generic method:
>
>
> // Connect the handler somewhere...
> my_button.clicked.connect (on_button_click);
>
>
> void on_button_click (Gtk.Button button) {
>      // You can do ref erence comparison here, like:
>      if (button == my_button) {
>
>
>      }
>
>
>      // button's parent can be accessed using button.parent ...
> }
>
>
> You could also subclass Gtk.Button and provide your own signal there:
>
>
> public class MyButton : Gtk.Button {
>     public signal void custom_signal ();
>
>
>     public MyButton () { }
>
>
>     public override void clicked () {
>         custom_signal ();
>     }
> }
>
>
>
>
> Best Regards.
>
>
> P.S. I speak Spanish
>
>
> On vie, sep 7, 2012 at 12:06 , D.H. Bahr <dbahr uci cu> wrote:
> > Hello there! 
> >
> > I've being experiencing a bug for a while now and I have no clue how
> > to 
> > solve it. The situation is as follows: 
> >
> > I have a set of classes (most of which handle some GtkWidget build
> > from 
> > a Glade XML using a GtkBuilder instance). One of those classes has
> > a 
> > GtkGrid and another has a GtkBox with a GtkLabel and a GtkButtonBox
> > with 
> > two GtkButtonses. To the Grid-ish instance I add several Box-ish 
> > instances (if you catch my drift) and what I need is to be able to
> > tell 
> > which GtkButton from which box-ish instance is being clicked. 
> >
> > I tried using vala native signals on the box-ish class emitted when
> > the 
> > buttons where clicked an then connect those signals in the grid-ish 
> > class, but nothing seems to happen. 
> >
> > I hope I've made my self clear. 
> >
> > Has anybody done something similar?? 
> >
> > Best regards, 
> >
> > D.H. Bahr 
> >
> >
> >
> > 10mo. ANIVERSARIO DE LA CREACION DE LA UNIVERSIDAD DE LAS CIENCIAS
> > INFORMATICAS... 
> > CONECTADOS AL FUTURO, CONECTADOS A LA REVOLUCION 
> >
> > http://www.uci.cu 
> > http://www.facebook.com/universidad.uci 
> > http://www.flickr.com/photos/universidad_uci 
> > _______________________________________________ 
> > vala-list mailing list 
> > vala-list gnome org 
> > https://mail.gnome.org/mailman/listinfo/vala-list 



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CONECTADOS AL FUTURO, CONECTADOS A LA REVOLUCION

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