strings: Add auto-updating UserStatusString

This is needed to have an online status label that auto-updates when the
status is updated and when time passes (needed to e.g. update the string
from "50 minutes ago" to "51 minutes ago").

src/session/content/chat_info_window.rs

@@ -8,7 +8,7 @@ use tdlib::functions;
 use tdlib::types::{BasicGroupFullInfo, SupergroupFullInfo};
 
 use crate::i18n::ngettext_f;
-use crate::tdlib::{BasicGroup, BoxedUserStatus, Chat, ChatType, Supergroup, User};
+use crate::tdlib::{BasicGroup, Chat, ChatType, Supergroup, User};
 use crate::utils::spawn;
 use crate::{expressions, strings};
 
@@ -134,13 +134,9 @@ impl ChatInfoWindow {
         if let UserType::Bot(_) = user.type_().0 {
             imp.subtitle_label.set_label(&gettext("bot"));
         } else {
-            User::this_expression("status")
-                .chain_closure::<String>(closure!(
-                    |_: Option<glib::Object>, status: BoxedUserStatus| {
-                        strings::user_status(&status.0)
-                    }
-                ))
-                .bind(&*imp.subtitle_label, "label", Some(user));
+            gtk::ConstantExpression::new(&strings::UserStatusString::new(user.clone()))
+                .chain_property::<strings::UserStatusString>("string")
+                .bind(&*imp.subtitle_label, "label", glib::Object::NONE);
         }
 
         // Phone number

src/strings.rs → src/strings/mod.rs

@@ -1,3 +1,7 @@
+mod user_status_string;
+
+pub(crate) use user_status_string::UserStatusString;
+
 use ellipse::Ellipse;
 use gettextrs::gettext;
 use gtk::glib;
@@ -28,7 +32,6 @@ pub(crate) fn user_status(status: &UserStatus) -> String {
             let was_online = glib::DateTime::from_unix_local(data.was_online as i64).unwrap();
             let time_span = now.difference(&was_online);
 
-            // TODO: Add a way to update the string when time passes
             if time_span.as_days() > 1 {
                 // Translators: This is an online status with the date
                 was_online.format(&gettext("last seen %x")).unwrap().into()

src/strings/user_status_string.rs

@@ -0,0 +1,78 @@
+use glib::clone;
+use gtk::glib;
+use gtk::prelude::*;
+use gtk::subclass::prelude::*;
+use tdlib::enums::UserStatus;
+
+use crate::strings;
+use crate::tdlib::User;
+
+mod imp {
+    use super::*;
+    use once_cell::sync::Lazy;
+    use once_cell::unsync::OnceCell;
+
+    #[derive(Debug, Default)]
+    pub(crate) struct UserStatusString(pub(super) OnceCell<User>);
+
+    #[glib::object_subclass]
+    impl ObjectSubclass for UserStatusString {
+        const NAME: &'static str = "UserStatusString";
+        type Type = super::UserStatusString;
+    }
+
+    impl ObjectImpl for UserStatusString {
+        fn properties() -> &'static [glib::ParamSpec] {
+            static PROPERTIES: Lazy<Vec<glib::ParamSpec>> =
+                Lazy::new(|| vec![glib::ParamSpecString::builder("string").read_only().build()]);
+            PROPERTIES.as_ref()
+        }
+
+        fn property(&self, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
+            let obj = self.obj();
+
+            match pspec.name() {
+                "string" => obj.string().to_value(),
+                _ => unimplemented!(),
+            }
+        }
+    }
+}
+
+glib::wrapper! {
+    pub(crate) struct UserStatusString(ObjectSubclass<imp::UserStatusString>);
+}
+
+impl UserStatusString {
+    pub(crate) fn new(user: User) -> UserStatusString {
+        let obj: UserStatusString = glib::Object::builder().build();
+
+        user.connect_notify_local(
+            Some("status"),
+            clone!(@weak obj => move |_, _| {
+                obj.notify("string");
+            }),
+        );
+
+        // TODO: Maybe sync with the seconds of the last
+        // offline state so that we're always precise.
+        glib::timeout_add_seconds_local(
+            60,
+            clone!(@weak obj => @default-return glib::Continue(false), move || {
+                let user = obj.imp().0.get().unwrap();
+                if let UserStatus::Offline(_) = user.status().0 {
+                    obj.notify("string");
+                }
+                glib::Continue(true)
+            }),
+        );
+
+        obj.imp().0.set(user).unwrap();
+        obj
+    }
+
+    pub(crate) fn string(&self) -> String {
+        let user = self.imp().0.get().unwrap();
+        strings::user_status(&user.status().0)
+    }
+}