> That's not an issue - you can put even a pointer but the problem is that
> you need to pin object. You don't know (automatically without user
> intervention) when you can free the resource. At any point GTK might
> keep GtkTreeIter alive so data you put inside cannot be freed (or
> garbage collected or however you'll call it) and it need's to be always
> considered 'alive'. I guess it is possible to workaround the issue by
> reverse engineering the Gtk internals but solution would be very
> unstable and not remotely elegant.
The problem with GtkTreeIter is that you can't make any function to be
called when iter goes out of scope. Example:
int
foo(void)
{
GtkTreeIter iter;
get_iter_of_something (&iter);
do_something_with_iter (&iter);
/* iter is no longer needed, C frees its memory
automatically, but we can't make it call a
custom function, as C doesn't have C++'s
destructors, that's why we can't put references
to JavaScript objects into them */
}
However, luckily for us, GtkTreeIter has an integer stamp field that
could be used instead of a direct reference. JavaScript custom tree
models will be slower as they would need to look up items by their
stamps. Example:
_init: function() {
this.parent(...);
this._items = [];
},
getTreeIterOfItem: function(itemStamp)
{
if (this._items[itemStamp] === undefined)
return undefined;
return new Gtk.TreeIter(itemStamp);
},
getItemByTreeIter: function(iter)
{
return this._items[iter.stamp];
}
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