Implement the animation

Cargo.lock

@@ -443,6 +443,7 @@ dependencies = [
 name = "parrotd"
 version = "0.1.0"
 dependencies = [
+ "glib",
  "gtk",
  "libappindicator",
 ]

Cargo.toml

@@ -8,3 +8,4 @@ edition = "2021"
 [dependencies]
 libappindicator = "0.7"
 gtk = "0.15"
+glib = "0.15"

src/main.rs

@@ -7,13 +7,11 @@ pub use err::*;
 use libappindicator::*;
 use gtk::prelude::*;
 use pack::*;
+use std::time::{Duration, Instant};
 
-fn main() {
-    gtk::init().unwrap();
-    let mut icon_pack = IconPack::new("./res", "parrot", PackVariant::Dark).unwrap();
+fn init_indicator(icon_pack: &IconPack) -> AppIndicator {
     let mut indicator = AppIndicator::new("parrotd", "");
     indicator.set_icon_theme_path(icon_pack.pack_path());
-    indicator.set_icon_full(icon_pack.next_icon_path(), "parrotd");
     indicator.set_status(AppIndicatorStatus::Active);
     let mut m = gtk::Menu::new();
     let mi = gtk::CheckMenuItem::with_label("I'm a parrot");
@@ -23,5 +21,25 @@ fn main() {
     m.append(&mi);
     indicator.set_menu(&mut m);
     m.show_all();
+    return indicator;
+}
+
+fn main() {
+    gtk::init().unwrap();
+
+    let mut icon_pack = IconPack::new("./res", "parrot", PackVariant::Dark).unwrap();
+    let mut indicator = init_indicator(&icon_pack);
+
+    // Animation task
+    let mut last_update = Instant::now();
+    glib::timeout_add_local(Duration::from_millis(1000 / 60) /* maximum 60Hz */, move || {
+        let now = Instant::now();
+        if now - last_update >= Duration::from_millis(100) {
+            indicator.set_icon(icon_pack.next_icon_path());
+            last_update = now;
+        }
+        Continue(true)
+    });
+
     gtk::main();
 }