Move time_button into its own custom widget

src/time_button.rs

@@ -0,0 +1,87 @@
+use cascade::cascade;
+use gtk4::{
+    glib::{self, clone},
+    prelude::*,
+    subclass::prelude::*,
+};
+
+use crate::deref_cell::DerefCell;
+use crate::mpris::MprisControls;
+
+#[derive(Default)]
+pub struct TimeButtonInner {
+    menu_button: DerefCell<gtk4::MenuButton>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for TimeButtonInner {
+    const NAME: &'static str = "S76TimeButton";
+    type ParentType = gtk4::Widget;
+    type Type = TimeButton;
+
+    fn class_init(klass: &mut Self::Class) {
+        klass.set_layout_manager_type::<gtk4::BinLayout>();
+    }
+}
+
+impl ObjectImpl for TimeButtonInner {
+    fn constructed(&self, obj: &TimeButton) {
+        let menu_button = cascade! {
+            gtk4::MenuButton::new();
+            ..set_parent(obj);
+            ..set_direction(gtk4::ArrowType::None);
+            ..set_popover(Some(&cascade! {
+                gtk4::Popover::new();
+                ..set_child(Some(&cascade! {
+                    gtk4::Box::new(gtk4::Orientation::Horizontal, 0);
+                    ..append(&MprisControls::new());
+                    ..append(&cascade! {
+                        gtk4::Calendar::new();
+                    });
+                }));
+            }));
+        };
+
+        self.menu_button.set(menu_button);
+
+        // TODO: better way to do this?
+        glib::timeout_add_seconds_local(
+            1,
+            clone!(@weak obj => @default-return glib::Continue(false), move || {
+                obj.update_time();
+                glib::Continue(true)
+            }),
+        );
+        obj.update_time();
+    }
+
+    fn dispose(&self, obj: &TimeButton) {
+        self.menu_button.unparent();
+    }
+}
+
+impl WidgetImpl for TimeButtonInner {}
+
+glib::wrapper! {
+    pub struct TimeButton(ObjectSubclass<TimeButtonInner>)
+        @extends gtk4::Widget;
+}
+
+impl TimeButton {
+    pub fn new() -> Self {
+        glib::Object::new(&[]).unwrap()
+    }
+
+    fn inner(&self) -> &TimeButtonInner {
+        TimeButtonInner::from_instance(self)
+    }
+
+    fn update_time(&self) {
+        // TODO: Locale-based formatting?
+        let time = chrono::Local::now();
+        self.inner()
+            .menu_button
+            .set_label(&time.format("%b %-d %-I:%M %p").to_string());
+        // time.format("%B %-d %Y")
+    }
+}