Add system tray support (#166)

* Added sytem tray with hide/show buttons

* Split tray into separate module

* Fix persistent console window

* Show/hide window on tray icon click

---------

Co-authored-by: serxka <serxka@protonmail.com>
Co-authored-by: Milo <40355097+serxka@users.noreply.github.com>
Co-authored-by: greentore <117551249+greentore@users.noreply.github.com>

src-tauri/src/tray.rs

@@ -0,0 +1,87 @@
+use tauri::{
+    CustomMenuItem, Manager, SystemTray, SystemTrayEvent, SystemTrayMenu,
+    SystemTrayMenuItem, WindowEvent, SystemTrayHandle, Window,
+};
+
+const TRAY_LABEL: &'static str = "main-tray";
+
+pub fn window_event_handler<R: tauri::Runtime>(
+    app: &tauri::AppHandle<R>,
+    label: &str,
+    event: &WindowEvent,
+) {
+    match event {
+        // Prevent Cinny from closing, instead hide it and let it be
+        // reopened through the tray.
+        WindowEvent::CloseRequested { api, .. } => {
+            api.prevent_close();
+            app.get_window(&label).unwrap().hide().unwrap();
+            app.tray_handle_by_id(TRAY_LABEL)
+                .unwrap()
+                .get_item("toggle")
+                .set_title("Show Cinny")
+                .unwrap();
+        }
+        _ => {}
+    }
+}
+
+/// Build the system tray object
+pub fn system_tray() -> SystemTray {
+    let toggle = CustomMenuItem::new("toggle".to_owned(), "Hide Cinny");
+    let quit = CustomMenuItem::new("quit".to_owned(), "Quit");
+    let menu = SystemTrayMenu::new()
+        .add_item(toggle)
+        .add_native_item(SystemTrayMenuItem::Separator)
+        .add_item(quit);
+
+    tauri::SystemTray::new()
+        .with_menu(menu)
+        .with_id(TRAY_LABEL.to_owned())
+}
+
+pub fn toggle_window_state<R: tauri::Runtime>(window: Window<R>, tray_handle: SystemTrayHandle<R>) {
+    // Hide the window if it's visible, show it if not
+    // `is_visible` returns true for minimized state for whatever reason
+    if window.is_visible().unwrap() {
+        window.hide().unwrap();
+        tray_handle
+            .get_item("toggle")
+            .set_title("Show Cinny")
+            .unwrap();
+    } else {
+        window.unminimize().unwrap();
+        window.show().unwrap();
+        window.set_focus().unwrap();
+        tray_handle
+            .get_item("toggle")
+            .set_title("Hide Cinny")
+            .unwrap();
+    };
+}
+
+pub fn system_tray_handler<R: tauri::Runtime>(app: &tauri::AppHandle<R>, event: SystemTrayEvent) {
+    let tray_handle = match app.tray_handle_by_id(TRAY_LABEL) {
+        Some(h) => h,
+        None => return,
+    };
+    let window = app.get_window("main").unwrap();
+
+    match event {
+        SystemTrayEvent::LeftClick { .. } => {
+            toggle_window_state(window, tray_handle);
+        }
+        SystemTrayEvent::MenuItemClick { id, .. } => {
+            match id.as_str() {
+                "quit" => {
+                    app.exit(0);
+                }
+                "toggle" => {
+                    toggle_window_state(window, tray_handle)
+                }
+                _ => {}
+            }
+        }
+        _ => {}
+    }
+}