Re: Problem with Gtk.ListStore

[Alan Knowles <alan akbkhome com>]

Have you tried

this.store.set_value(iter, 0, ''+items[0]);

It does sound like it's an implementation problem in gjs, as it works 
fine in seed (as I spent some time fixing it a long while ago...)

Regards
Alan


On Wednesday, July 18, 2012 03:55 PM, Peter Verthez wrote:
> Follow-up with some more experimentation...
>
> It seems that ListStore.set_value works if you pass a string (literal) 
> value, but fails when you pass a String (Object) value.
>
> The following works:
>         this.store.set_value(iter, 0, "test");
>
> but the following fails (and even causes gjs-console to abort with 
> SIGSEGV):
>         this.store.set_value(iter, 0, new String("test"));
>
> Since literal values are converted to a String object when passed to a 
> method, that causes the behavior mentioned in my previous mail.   This 
> makes that a ListStore with String values is currently not usable.
>
> I'll submit a bug report (version info: gjs-1.32.0-1.fc17.rpm).
>
> Best regards,
> Peter.
>
>
> On 07/17/2012 06:26 PM, Peter Verthez wrote:
> > Hi,
> >
> > I'm trying to write a gnome shell extension.   As part of that I'm 
> > making a preference page for which one of the preferences is a file 
> > list.   I'm modelling this as a TreeView, with an Add button next to 
> > it that opens a FileChooserDialog, and adds the selected file name in 
> > the list when OK is pressed.
> >
> > I have however a problem with inserting values in that treeview. The 
> > treeview is created like this:
> >
> >         this.actor = new Gtk.TreeView({headers_visible: false});
> >         this.store = new Gtk.ListStore();
> >         this.store.set_column_types([GObject.TYPE_STRING]);
> >         this.actor.set_model(this.store);
> >
> >         this.column = new Gtk.TreeViewColumn();
> >         this.cell = new Gtk.CellRendererText();
> >         this.column.pack_start(this.cell, true);
> >         this.column.add_attribute(this.cell, "text", 0);
> >         this.actor.append_column(this.column);
> >
> > this.actor.get_selection().set_mode(Gtk.SelectionMode.MULTIPLE);
> >         ...
> >
> > And when I add literal values, it works:
> >
> >         this.store.clear();
> >         let iter = this.store.append();
> >         this.store.set_value(iter, 0, "test");
> >
> > But string values passed on from somewhere else don't work (I'm 
> > simplifying here, I want to do a loop on items of course):
> >
> >         update_all: function() {
> >            this.update(["test"]);
> >         },
> >
> >         update: function(items) {
> >            this.store.set_value(iter, 0, items[0]);
> >            ...
> >         }
> >
> > with as error:
> > Error: Could not guess unspecified GValue type
> >
> > When the 'items' variable is a local array in the method, it works 
> > and is indeed shown in the treeview:
> >
> >         // items is an array of string passed to the surrounding 
> > function
> >         update: function() {
> >            let items = ["test"];
> >            this.store.set_value(iter, 0, items[0]);
> >            ...
> >         }
> >
> > I've also tried creating a GObject.Value explicitly to pass to 
> > set_value (I'm assuming that this is the correct way to construct a 
> > GObject.Value, because if I try it in lg at least get_string() 
> > returns the proper value):
> >
> >         let v = new GObject.Value();
> >         v.init(GObject.TYPE_STRING);
> >         v.set_string(items[0]);
> >         this.store.set_value(iter, 0, v);
> >
> > But that gave me the same error message.
> >
> > I suppose this is a bug in the javascript binding?
> >
> > Best regards,
> > Peter.