Re: Using Gio::ListStore with custom content type and Gtk::ListView (Gtkmm 4)

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Hi again,

From an earlier thread I found the columnview demo (
https://gitlab.gnome.org/GNOME/gtkmm/-/blob/master/demos/gtk-demo/example_listview_columnview.cc),
which was exactly what I needed!

In case anyone runs into the same problem as I did, my mistake was using
`std::make_shared` to create new instances, when I should have been using
`Glib::make_refptr_for_instance`.

Have a good day,

Jackson

On Sun, Feb 20, 2022 at 6:36 PM Jackson Campolattaro <[email protected]>
wrote:

> Hello,
>
> I would like to use `Gtk::ListView` to display a custom type held in a
> `Gio::ListStore`, but inside my `on_bind(list_item)` handler
> `list_item->get_item()` returns a null RefPtr. I also get the same "Failed
> to wrap" error seen [here](
> https://stackoverflow.com/questions/3233727/what-has-to-be-glibinited-in-order-to-use-glibwrap),
> but adding `Glib::init()` at the start of my program didn't help.
>
> I haven't been able to get the ListStore working with any types, including
> the example custom `Glib::Object` shown [here](
> https://github.com/GNOME/glibmm/blob/master/examples/properties/properties_example.cc)
> and provided Object types like `Gtk::Box`. `Gtk::StringList` works fine, so
> I suspect the problem lies in how I'm using the ListStore.
>
> Has anyone produced a known-working example of a `Gtk::ListView` which
> displays custom objects?
>
> Kind regards,
>
> Jackson Campolattaro
>
> --
> Jackson Campolattaro
> Masters Student at TU Delft
>


-- 
Jackson Campolattaro
Masters Student at TU Delft

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<div dir=3D"ltr"><div>Hi again,</div><div><br></div><div>From an earlier th=
read I found the columnview demo (<a href=3D"https://gitlab.gnome.org/GNOME=
/gtkmm/-/blob/master/demos/gtk-demo/example_listview_columnview.cc">https:/=
/gitlab.gnome.org/GNOME/gtkmm/-/blob/master/demos/gtk-demo/example_listview=
_columnview.cc</a>), which was exactly what I needed! <br></div><div><br></=
div><div>In case anyone runs into the same problem as I did, my mistake was=
 using `std::make_shared` to create new instances, when I should have been =
using `Glib::make_refptr_for_instance`.</div><div><br></div><div>Have a goo=
d day,</div><div><br></div><div>Jackson<br></div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Feb 20, 2022 at 6:=
36 PM Jackson Campolattaro &lt;<a href=3D"mailto:[email protected]">jackcamp@=
vt.edu</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex"><div dir=3D"ltr"><div>Hello,</div><div><br></div><div>I would like to=
 use `Gtk::ListView` to display a custom type held in a `Gio::ListStore`, b=
ut inside my `on_bind(list_item)` handler `list_item-&gt;get_item()` return=
s a null RefPtr. I also get the same &quot;Failed to wrap&quot; error seen =
[here](<a href=3D"https://stackoverflow.com/questions/3233727/what-has-to-b=
e-glibinited-in-order-to-use-glibwrap" target=3D"_blank">https://stackoverf=
low.com/questions/3233727/what-has-to-be-glibinited-in-order-to-use-glibwra=
p</a>), but adding `Glib::init()` at the start of my program didn&#39;t hel=
p. <br></div><div><br></div><div>I haven&#39;t been able to get the ListSto=
re working with any types, including the example custom `Glib::Object` show=
n [here](<a href=3D"https://github.com/GNOME/glibmm/blob/master/examples/pr=
operties/properties_example.cc" target=3D"_blank">https://github.com/GNOME/=
glibmm/blob/master/examples/properties/properties_example.cc</a>) and provi=
ded Object types like `Gtk::Box`. `Gtk::StringList` works fine, so I suspec=
t the problem lies in how I&#39;m using the ListStore.</div><div><br></div>=
<div>Has anyone produced a known-working example of a `Gtk::ListView` which=
 displays custom objects?</div><div><br></div><div>Kind regards,</div><div>=
<br></div><div>Jackson Campolattaro<br></div><div><br>-- <br><div dir=3D"lt=
r"><div dir=3D"ltr"><div><div dir=3D"ltr"><font size=3D"2">Jackson Campolat=
taro</font></div><div><font size=3D"2"><font size=3D"1">Masters Student at =
TU Delft</font><br></font></div></div></div></div></div></div>
</blockquote></div><br clear=3D"all"><br>-- <br><div dir=3D"ltr" class=3D"g=
mail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><font size=3D"2">Jac=
kson Campolattaro</font></div><div><font size=3D"2"><font size=3D"1">Master=
s Student at TU Delft</font><br></font></div></div></div></div>

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