Problem with sorting ColumnView

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Hello,

I'm trying to use the Gtk ColumnView to show a custom ListModel in sorted
order. I noticed that when I set a simple sorter for a column and then sort
by that column, the order isn't changed. The UI allows me to switch between
ascending and descending, but doing so doesn't reverse the list.

I've created a simplified example, which is supposed to show the file paths
in the current directory in alphabetical order, but doesn't:

#include <gtkmm.h>
> #include <giomm.h>
>
> class MyWindow : public Gtk::Window {
> private:
>
>     Glib::RefPtr<Gio::ListStore<Gio::File>> _listModel;
>     Glib::RefPtr<Gtk::SingleSelection> _selectionModel;
>
>     Gtk::ColumnView _columnView;
>
> public:
>     MyWindow() {
>
>         _listModel = Gio::ListStore<Gio::File>::create();
>         _selectionModel = Gtk::SingleSelection::create(_listModel);
>         _columnView.set_model(_selectionModel);
>
>         auto files = Gio::File::create_for_path(".")->enumerate_children();
>         Glib::RefPtr<Gio::FileInfo> fileInfo;
>         while ((fileInfo = files->next_file())) {
>
> _listModel->append(Gio::File::create_for_path(fileInfo->get_name()));
>         }
>
>         auto _factory = Gtk::SignalListItemFactory::create();
>         _factory->signal_setup().connect([](auto listItem) {
>
> listItem->set_child(*Gtk::make_managed<Gtk::Label>("Placeholder!"));
>         });
>         _factory->signal_bind().connect([](auto listItem) {
>             auto data =
> std::dynamic_pointer_cast<Gio::File>(listItem->get_item());
>             auto label = dynamic_cast<Gtk::Label *>(listItem->get_child());
>             if (data && label) {
>                 label->set_text(data->get_path());
>                 label->set_xalign(0);
>             }
>         });
>
>         auto column = Gtk::ColumnViewColumn::create("File Paths",
> _factory);
>         _columnView.append_column(column);
>
>         column->set_sorter(Gtk::StringSorter::create(
>                 Gtk::ClosureExpression<Glib::ustring>::create([](auto
> item) {
>                     auto data = std::dynamic_pointer_cast<Gio::File>(item);
>                     return data->get_path();
>                 })
>         ));
>         _columnView.sort_by_column(column, Gtk::SortType::ASCENDING);
>
>         set_child(_columnView);
>     };
> };
>
> int main(int argc, char *argv[]) {
>     auto app = Gtk::Application::create("org.gtkmm.examples.base");
>     return app->make_window_and_run<MyWindow>(argc, argv);
> }
>

Perhaps this is a bug, but before I report it I wanted to make sure I'm not
doing something wrong.

Thanks,

Jackson

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<div dir=3D"ltr"><div>Hello,</div><div><br></div><div>I&#39;m trying to use=
 the Gtk ColumnView to show a custom ListModel in sorted order. I noticed t=
hat when I set a simple sorter for a column and then sort by that column, t=
he order isn&#39;t changed. The UI allows me to switch between ascending an=
d descending, but doing so doesn&#39;t reverse the list.<br></div><div><br>=
</div><div>I&#39;ve created a simplified example, which is supposed to show=
 the file paths in the current directory in alphabetical order, but doesn&#=
39;t:</div><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
><div><span style=3D"font-family:monospace">#include &lt;gtkmm.h&gt;<br>#in=
clude &lt;giomm.h&gt;<br><br>class MyWindow : public Gtk::Window {<br>priva=
te:<br><br>=C2=A0 =C2=A0 Glib::RefPtr&lt;Gio::ListStore&lt;Gio::File&gt;&gt=
; _listModel;<br>=C2=A0 =C2=A0 Glib::RefPtr&lt;Gtk::SingleSelection&gt; _se=
lectionModel;<br><br>=C2=A0 =C2=A0 Gtk::ColumnView _columnView;<br><br>publ=
ic:<br>=C2=A0 =C2=A0 MyWindow() {<br><br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 _listM=
odel =3D Gio::ListStore&lt;Gio::File&gt;::create();<br>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 _selectionModel =3D Gtk::SingleSelection::create(_listModel);<br>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 _columnView.set_model(_selectionModel);<br><br>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 auto files =3D Gio::File::create_for_path(&quot=
;.&quot;)-&gt;enumerate_children();<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Glib::Re=
fPtr&lt;Gio::FileInfo&gt; fileInfo;<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 while ((=
fileInfo =3D files-&gt;next_file())) {<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 _listModel-&gt;append(Gio::File::create_for_path(fileInfo-&gt;ge=
t_name()));<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 }<br><br>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 auto _factory =3D Gtk::SignalListItemFactory::create();<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 _factory-&gt;signal_setup().connect([](auto listItem) =
{<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 listItem-&gt;set_child(*Gtk:=
:make_managed&lt;Gtk::Label&gt;(&quot;Placeholder!&quot;));<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 });<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 _factory-&gt;signal_bi=
nd().connect([](auto listItem) {<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 auto data =3D std::dynamic_pointer_cast&lt;Gio::File&gt;(listItem-&gt;g=
et_item());<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto label =3D dyn=
amic_cast&lt;Gtk::Label *&gt;(listItem-&gt;get_child());<br>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (data &amp;&amp; label) {<br>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 label-&gt;set_text(data-&gt;get_p=
ath());<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 label-&g=
t;set_xalign(0);<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 });<br><br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 auto column =3D=
 Gtk::ColumnViewColumn::create(&quot;File Paths&quot;, _factory);<br>=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 _columnView.append_column(column);<br><br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 column-&gt;set_sorter(Gtk::StringSorter::create(<br>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Gtk::ClosureExpression=
&lt;Glib::ustring&gt;::create([](auto item) {<br>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto data =3D std::dynamic_po=
inter_cast&lt;Gio::File&gt;(item);<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return data-&gt;get_path();<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 })<br>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 ));<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 _columnView.sort_by_column(colum=
n, Gtk::SortType::ASCENDING);<br><br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 set_child(=
_columnView);<br>=C2=A0 =C2=A0 };<br>};<br><br>int main(int argc, char *arg=
v[]) {<br>=C2=A0 =C2=A0 auto app =3D Gtk::Application::create(&quot;org.gtk=
mm.examples.base&quot;);<br>=C2=A0 =C2=A0 return app-&gt;make_window_and_ru=
n&lt;MyWindow&gt;(argc, argv);<br>}</span></div></blockquote><div><br></div=
><div>Perhaps this is a bug, but before I report it I wanted to make sure I=
&#39;m not doing something wrong.</div><div><br></div><div>Thanks,</div><di=
v><br></div><div>Jackson</div></div>

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