Migrate `Gtk::ListStore::iterator` code

[kaixoo (Kaixo)]

I am trying to migrate some gtk3 → gtk4 code regarding Gtk::ListStore and the new Gio::ListStore.

The task of the class is to fetch memory/allocation data and show it in a TreeView in Inkscpape.

I’ve started to refactor it into purely gtk4 code (TreeView → ListView, TreeView.model → ListView.factory, …)
The code has a function update which gets state and updates all rows. Currently this is done using an Gtk::ListStore::iterator, but Gio::ListStore doesn’t have this property (as it’s only data). I have doubts on how to use this class. Do I need a separate model for the UI?

Another problem is that I have included giomm/liststore.h, however I can’t use Gio::ListStore. IDE recommends GListStore, but marks it as an incomplete type afterwards.

Original gtk3 code → src/ui/dialog/memory.cpp · master · Inkscape / inkscape · GitLab
Partial gtk4 code → src/ui/widget/memory.cpp · kaixoo/merge-debug-dialogs · Kaixo Gamorra / inkscape · GitLab

[taozuhong]

Here are two examples for you:
taozuhong/GtkColumnViewDemo: A GtkColumnView demo app (github.com)

GListModel support modified items?

The GtkExpression and GObject::notify can’t cover the computed or multiple value scenes, for example: The Row object has many items (column value object), one of them changed its hold value or property, maybe multiple values at time. In our case, we make many changes at time, then refresh the UI (GtkListView / GtkColumnView) normally, pls see the Vala code as follow: public class ValueObject : Object, IValue { public virtual string name { get { return "UNKNOWN"; } } public…

[kaixoo (Kaixo)]

What are the changes needed to make? I can’t read your gigantic code. Thanks for the quick response btw!

[kjellahl (Kjell Ahlstedt)]

It’s true that Gio::ListStore doesn’t have an iterator. But it has
Gio::ListModel::get_n_items() and Gio::ListStore<T_item>::get_item(position).
Items in a Gio::ListStore are reference counted. get_item() does not get a copy,
it gets a Glib::RefPtr to the item in the Gio::ListStore.

I have included giomm/liststore.h, however I can’t use Gio::ListStore.

How do you try to use it? Have you noticed that Gio::ListStore is a template class?

[kaixoo (Kaixo)]

well, that explains it. I don’t know why I didn’t see that in the docs. Thank you so much!
Yes, I know it’s a template class.