core: Add TypedListView type

CHANGES.md

@@ -4,6 +4,7 @@
 
 ### Added
 
++ core: Add `TypedListView` as idiomatic wrapper over `gtk::ListView`
 + core: Introduce setting and action safeties
 + examples: Introduce setting and action safeties
 + core: Implement `RelmSetChildExt` for `gtk::AspectFrame`

examples/typed_list_view.rs

@@ -0,0 +1,186 @@
+use gtk::prelude::*;
+use relm4::{
+    binding::{Binding, U8Binding},
+    prelude::*,
+    typed_list_view::{RelmListItem, TypedListView},
+    RelmObjectExt,
+};
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+struct MyListItem {
+    value: u8,
+    binding: U8Binding,
+}
+
+impl MyListItem {
+    fn new(value: u8) -> Self {
+        Self {
+            value,
+            binding: U8Binding::new(0),
+        }
+    }
+}
+
+struct Widgets {
+    label: gtk::Label,
+    label2: gtk::Label,
+    button: gtk::CheckButton,
+}
+
+impl Drop for Widgets {
+    fn drop(&mut self) {
+        dbg!(self.label.label());
+    }
+}
+
+impl RelmListItem for MyListItem {
+    type Root = gtk::Box;
+    type Widgets = Widgets;
+
+    fn setup(_item: &gtk::ListItem) -> (gtk::Box, Widgets) {
+        relm4::view! {
+            my_box = gtk::Box {
+                #[name = "label"]
+                gtk::Label,
+
+                #[name = "label2"]
+                gtk::Label,
+
+                #[name = "button"]
+                gtk::CheckButton,
+            }
+        }
+
+        let widgets = Widgets {
+            label,
+            label2,
+            button,
+        };
+
+        (my_box, widgets)
+    }
+
+    fn bind(&mut self, widgets: &mut Self::Widgets, _root: &mut Self::Root) {
+        let Widgets {
+            label,
+            label2,
+            button,
+        } = widgets;
+
+        label.set_label(&format!("Value: {} ", self.value));
+        label2.add_write_only_binding(&self.binding, "label");
+        button.set_active(self.value % 2 == 0);
+    }
+}
+
+struct App {
+    counter: u8,
+    list_view_wrapper: TypedListView<MyListItem, gtk::SingleSelection>,
+}
+
+#[derive(Debug)]
+enum Msg {
+    Append,
+    Remove,
+    OnlyShowEven(bool),
+}
+
+#[relm4::component]
+impl SimpleComponent for App {
+    type Init = u8;
+    type Input = Msg;
+    type Output = ();
+
+    view! {
+        gtk::Window {
+            set_title: Some("Actually idiomatic list view possible?"),
+            set_default_size: (300, 100),
+
+            gtk::Box {
+                set_orientation: gtk::Orientation::Vertical,
+                set_spacing: 5,
+                set_margin_all: 5,
+
+                gtk::Button {
+                    set_label: "Append 10 items",
+                    connect_clicked => Msg::Append,
+                },
+
+                gtk::Button {
+                    set_label: "Remove second item",
+                    connect_clicked => Msg::Remove,
+                },
+
+                gtk::ToggleButton {
+                    set_label: "Only show even numbers",
+                    connect_clicked[sender] => move |btn| {
+                        sender.input(Msg::OnlyShowEven(btn.is_active()));
+                    }
+                },
+
+                gtk::ScrolledWindow {
+                    set_vexpand: true,
+
+                    #[local_ref]
+                    my_view -> gtk::ListView {}
+                }
+            }
+        }
+    }
+
+    fn init(
+        counter: Self::Init,
+        root: &Self::Root,
+        sender: ComponentSender<Self>,
+    ) -> ComponentParts<Self> {
+        // Initialize the ListView wrapper
+        let mut list_view_wrapper: TypedListView<MyListItem, gtk::SingleSelection> =
+            TypedListView::with_sorting();
+
+        // Add a filter and disable it
+        list_view_wrapper.add_filter(|item| item.value % 2 == 0);
+        list_view_wrapper.set_filter_status(0, false);
+
+        let model = App {
+            counter,
+            list_view_wrapper,
+        };
+
+        let my_view = &model.list_view_wrapper.view;
+
+        let widgets = view_output!();
+
+        ComponentParts { model, widgets }
+    }
+
+    fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>) {
+        match msg {
+            Msg::Append => {
+                // Add 10 items
+                for _ in 0..10 {
+                    self.counter = self.counter.wrapping_add(1);
+                    self.list_view_wrapper.append(MyListItem::new(self.counter));
+                }
+
+                // Count up the first item
+                let first_item = self.list_view_wrapper.get(0).unwrap();
+                let first_binding = &mut first_item.borrow_mut().binding;
+                let mut guard = first_binding.guard();
+                *guard += 1;
+            }
+            Msg::Remove => {
+                // Remove the second item
+                self.list_view_wrapper.remove(1);
+            }
+            Msg::OnlyShowEven(show_only_even) => {
+                // Disable or enable the first filter
+                self.list_view_wrapper.set_filter_status(0, show_only_even);
+            }
+        }
+    }
+}
+
+fn main() {
+    let app = RelmApp::new("relm4.example.typed-list-view");
+    app.run::<App>(0);
+}