feat: implement CheckMenuItem (#13)

* feat: implement `CheckMenuItem`

* linux

src/lib.rs

@@ -106,11 +106,11 @@ impl Menu {
     ///
     /// ## Platform-specific:
     ///
-    /// - **Windows / Linux:** The menu label can containt `&` to indicate which letter should get a generated accelerator.
+    /// - **Windows / Linux:** The menu label can contain `&` to indicate which letter should get a generated accelerator.
     /// For example, using `&File` for the File menu would result in the label gets an underline under the `F`,
     /// and the `&` character is not displayed on menu label.
     /// Then the menu can be activated by press `Alt+F`.
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         Submenu(self.0.add_submenu(label, enabled))
     }
 
@@ -232,7 +232,7 @@ impl Menu {
     }
 }
 
-/// This is a submenu within another [`Submenu`] or [`Menu`].
+/// This is a Submenu within another [`Submenu`] or [`Menu`].
 #[derive(Clone)]
 pub struct Submenu(platform_impl::Submenu);
 
@@ -243,7 +243,7 @@ impl Submenu {
     }
 
     /// Sets a new label for the submenu.
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         self.0.set_label(label)
     }
 
@@ -261,11 +261,11 @@ impl Submenu {
     ///
     /// ## Platform-specific:
     ///
-    /// - **Windows / Linux:** The menu label can containt `&` to indicate which letter should get a generated accelerator.
+    /// - **Windows / Linux:** The menu label can contain `&` to indicate which letter should get a generated accelerator.
     /// For example, using `&File` for the File menu would result in the label gets an underline under the `F`,
     /// and the `&` character is not displayed on menu label.
     /// Then the menu can be activated by press `F` when its parent menu is active.
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         Submenu(self.0.add_submenu(label, enabled))
     }
 
@@ -273,22 +273,34 @@ impl Submenu {
     ///
     /// ## Platform-specific:
     ///
-    /// - **Windows / Linux:** The menu item label can containt `&` to indicate which letter should get a generated accelerator.
+    /// - **Windows / Linux:** The menu item label can contain `&` to indicate which letter should get a generated accelerator.
     /// For example, using `&Save` for the save menu item would result in the label gets an underline under the `S`,
     /// and the `&` character is not displayed on menu item label.
     /// Then the menu item can be activated by press `S` when its parent menu is active.
-    pub fn add_text_item(
+    pub fn add_text_item<S: AsRef<str>>(
         &mut self,
-        label: impl AsRef<str>,
+        label: S,
         enabled: bool,
         accelerator: Option<&str>,
     ) -> TextMenuItem {
         TextMenuItem(self.0.add_text_item(label, enabled, accelerator))
     }
 
+    /// Creates a new [`NativeMenuItem`] within this submenu.
     pub fn add_native_item(&mut self, item: NativeMenuItem) {
         self.0.add_native_item(item)
     }
+
+    /// Creates a new [`CheckMenuItem`] within this submenu.
+    pub fn add_check_item<S: AsRef<str>>(
+        &mut self,
+        label: S,
+        enabled: bool,
+        checked: bool,
+        accelerator: Option<&str>,
+    ) -> CheckMenuItem {
+        CheckMenuItem(self.0.add_check_item(label, enabled, checked, accelerator))
+    }
 }
 
 /// This is a Text menu item within a [`Submenu`].
@@ -302,7 +314,7 @@ impl TextMenuItem {
     }
 
     /// Sets a new label for the menu item.
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         self.0.set_label(label)
     }
 
@@ -322,6 +334,48 @@ impl TextMenuItem {
     }
 }
 
+/// This is a Check menu item within a [`Submenu`].
+#[derive(Clone)]
+pub struct CheckMenuItem(platform_impl::CheckMenuItem);
+
+impl CheckMenuItem {
+    /// Gets the menu item's current label.
+    pub fn label(&self) -> String {
+        self.0.label()
+    }
+
+    /// Sets a new label for the menu item.
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
+        self.0.set_label(label)
+    }
+
+    /// Gets the menu item's current state, whether enabled or not.
+    pub fn enabled(&self) -> bool {
+        self.0.enabled()
+    }
+
+    /// Enables or disables the menu item.
+    pub fn set_enabled(&mut self, enabled: bool) {
+        self.0.set_enabled(enabled)
+    }
+
+    /// Gets the menu item's current state, whether checked or not.
+    pub fn checked(&self) -> bool {
+        self.0.checked()
+    }
+
+    /// Enables or disables the menu item.
+    pub fn set_checked(&mut self, checked: bool) {
+        self.0.set_checked(checked)
+    }
+
+    /// Gets the unique id for this menu item.
+    pub fn id(&self) -> u64 {
+        self.0.id()
+    }
+}
+
+/// This is a Native menu item within a [`Submenu`] with a predefined behavior.
 #[non_exhaustive]
 #[derive(PartialEq, Eq, Debug, Clone)]
 pub enum NativeMenuItem {

src/platform_impl/linux/accelerator.rs

@@ -1,4 +1,4 @@
-pub fn to_gtk_menemenoic(string: impl AsRef<str>) -> String {
+pub fn to_gtk_menemenoic<S: AsRef<str>>(string: S) -> String {
     string
         .as_ref()
         .replace("&&", "[~~]")
@@ -6,7 +6,7 @@ pub fn to_gtk_menemenoic(string: impl AsRef<str>) -> String {
         .replace("[~~]", "&&")
 }
 
-pub fn to_gtk_accelerator(accelerator: impl AsRef<str>) -> String {
+pub fn to_gtk_accelerator<S: AsRef<str>>(accelerator: S) -> String {
     let accelerator = accelerator.as_ref();
     let mut s = accelerator.split("+");
     let count = s.clone().count();

src/platform_impl/linux/mod.rs

@@ -8,13 +8,14 @@ use std::{cell::RefCell, collections::HashMap, rc::Rc};
 static COUNTER: Counter = Counter::new();
 
 /// Generic shared type describing a menu entry. It can be one of [`MenuEntryType`]
-#[derive(Debug)]
+#[derive(Debug, Default)]
 struct MenuEntry {
     label: String,
     enabled: bool,
-    r#type: MenuEntryType,
-    item_id: Option<u64>,
+    checked: bool,
+    id: u64,
     accelerator: Option<String>,
+    r#type: MenuEntryType,
     entries: Option<Vec<Rc<RefCell<MenuEntry>>>>,
 }
 
@@ -26,9 +27,16 @@ enum MenuEntryType {
     // and push to it every time [`Menu::init_for_gtk_window`] is called.
     Submenu(Vec<(gtk::MenuItem, gtk::Menu)>),
     Text(Vec<gtk::MenuItem>),
+    Check(Vec<gtk::CheckMenuItem>),
     Native(NativeMenuItem),
 }
 
+impl Default for MenuEntryType {
+    fn default() -> Self {
+        Self::Text(Default::default())
+    }
+}
+
 struct InnerMenu {
     entries: Vec<Rc<RefCell<MenuEntry>>>,
     // NOTE(amrbashir): because gtk doesn't allow using the same [`gtk::MenuBar`] and [`gtk::Box`]
@@ -51,7 +59,7 @@ impl Menu {
         })))
     }
 
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         let label = label.as_ref().to_string();
 
         let entry = Rc::new(RefCell::new(MenuEntry {
@@ -59,8 +67,7 @@ impl Menu {
             enabled,
             entries: Some(Vec::new()),
             r#type: MenuEntryType::Submenu(Vec::new()),
-            item_id: Default::default(),
-            accelerator: None,
+            ..Default::default()
         }));
 
         let mut inner = self.0.borrow_mut();
@@ -185,7 +192,7 @@ impl Submenu {
         self.0.borrow().label.clone()
     }
 
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         let label = label.as_ref().to_string();
         let mut entry = self.0.borrow_mut();
         if let MenuEntryType::Submenu(native_menus) = &mut entry.r#type {
@@ -210,7 +217,7 @@ impl Submenu {
         }
     }
 
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         let label = label.as_ref().to_string();
 
         let entry = Rc::new(RefCell::new(MenuEntry {
@@ -218,8 +225,7 @@ impl Submenu {
             enabled,
             entries: Some(Vec::new()),
             r#type: MenuEntryType::Submenu(Vec::new()),
-            item_id: Default::default(),
-            accelerator: None,
+            ..Default::default()
         }));
 
         let mut inner = self.0.borrow_mut();
@@ -237,9 +243,9 @@ impl Submenu {
         Submenu(entry, Rc::clone(&self.1))
     }
 
-    pub fn add_text_item(
+    pub fn add_text_item<S: AsRef<str>>(
         &mut self,
-        label: impl AsRef<str>,
+        label: S,
         enabled: bool,
         accelerator: Option<&str>,
     ) -> TextMenuItem {
@@ -250,9 +256,9 @@ impl Submenu {
             label: label.clone(),
             enabled,
             r#type: MenuEntryType::Text(Vec::new()),
-            item_id: Some(id),
+            id,
             accelerator: accelerator.map(|s| s.to_string()),
-            entries: None,
+            ..Default::default()
         }));
 
         let mut inner = self.0.borrow_mut();
@@ -288,14 +294,53 @@ impl Submenu {
 
         let entry = Rc::new(RefCell::new(MenuEntry {
             r#type: MenuEntryType::Native(item),
-            label: Default::default(),
-            enabled: Default::default(),
-            item_id: Default::default(),
-            accelerator: Default::default(),
-            entries: Default::default(),
+            ..Default::default()
         }));
         inner.entries.as_mut().unwrap().push(entry);
     }
+
+    pub fn add_check_item<S: AsRef<str>>(
+        &mut self,
+        label: S,
+        enabled: bool,
+        checked: bool,
+        accelerator: Option<&str>,
+    ) -> CheckMenuItem {
+        let label = label.as_ref().to_string();
+        let id = COUNTER.next();
+
+        let entry = Rc::new(RefCell::new(MenuEntry {
+            label: label.clone(),
+            enabled,
+            checked,
+            r#type: MenuEntryType::Check(Vec::new()),
+            id,
+            accelerator: accelerator.map(|s| s.to_string()),
+            ..Default::default()
+        }));
+
+        let mut inner = self.0.borrow_mut();
+
+        if let MenuEntryType::Submenu(native_menus) = &mut inner.r#type {
+            for (_, menu) in native_menus {
+                let item = create_gtk_check_menu_item(
+                    &label,
+                    enabled,
+                    checked,
+                    &accelerator.map(|s| s.to_string()),
+                    id,
+                    &*self.1,
+                );
+                menu.append(&item);
+                if let MenuEntryType::Check(native_items) = &mut entry.borrow_mut().r#type {
+                    native_items.push(item);
+                }
+            }
+        }
+
+        inner.entries.as_mut().unwrap().push(entry.clone());
+        CheckMenuItem(entry)
+    }
 }
 
 #[derive(Clone)]
@@ -306,7 +351,7 @@ impl TextMenuItem {
         self.0.borrow().label.clone()
     }
 
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         let label = label.as_ref().to_string();
         let mut entry = self.0.borrow_mut();
         if let MenuEntryType::Text(native_items) = &mut entry.r#type {
@@ -332,7 +377,68 @@ impl TextMenuItem {
     }
 
     pub fn id(&self) -> u64 {
-        self.0.borrow().item_id.unwrap()
+        self.0.borrow().id
+    }
+}
+
+#[derive(Clone)]
+pub struct CheckMenuItem(Rc<RefCell<MenuEntry>>);
+
+impl CheckMenuItem {
+    pub fn label(&self) -> String {
+        self.0.borrow().label.clone()
+    }
+
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
+        let label = label.as_ref().to_string();
+        let mut entry = self.0.borrow_mut();
+        if let MenuEntryType::Text(native_items) = &mut entry.r#type {
+            for item in native_items {
+                item.set_label(&to_gtk_menemenoic(&label));
+            }
+        }
+        entry.label = label;
+    }
+
+    pub fn enabled(&self) -> bool {
+        self.0.borrow().enabled
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        let mut entry = self.0.borrow_mut();
+        if let MenuEntryType::Check(native_items) = &mut entry.r#type {
+            for item in native_items {
+                item.set_sensitive(enabled);
+            }
+        }
+        entry.enabled = enabled;
+    }
+
+    pub fn checked(&self) -> bool {
+        let entry = self.0.borrow();
+        let mut checked = entry.checked;
+        if let MenuEntryType::Check(native_items) = &entry.r#type {
+            if let Some(item) = native_items.get(0) {
+              checked = item.is_active();
+            }
+        }
+
+        checked
+
+    }
+
+    pub fn set_checked(&mut self, checked: bool) {
+        let mut entry = self.0.borrow_mut();
+        if let MenuEntryType::Check(native_items) = &mut entry.r#type {
+            for item in native_items {
+                item.set_active(checked);
+            }
+        }
+        entry.checked = checked;
+    }
+
+    pub fn id(&self) -> u64 {
+        self.0.borrow().id
     }
 }
 
@@ -343,7 +449,7 @@ fn add_entries_to_menu<M: IsA<gtk::MenuShell>>(
 ) {
     for entry in entries {
         let mut entry = entry.borrow_mut();
-        let (item, submenu) = match &entry.r#type {
+        let (item, submenu) = match &mut entry.r#type {
             MenuEntryType::Submenu(_) => {
                 let (item, submenu) = create_gtk_submenu(&entry.label, entry.enabled);
                 gtk_menu.append(&item);
@@ -355,12 +461,24 @@ fn add_entries_to_menu<M: IsA<gtk::MenuShell>>(
                     &entry.label,
                     entry.enabled,
                     &entry.accelerator,
-                    entry.item_id.unwrap(),
+                    entry.id,
                     accel_group,
                 );
                 gtk_menu.append(&item);
                 (Some(item), None)
             }
+            MenuEntryType::Check(_) => {
+                let item = create_gtk_check_menu_item(
+                    &entry.label,
+                    entry.enabled,
+                    entry.checked,
+                    &entry.accelerator,
+                    entry.id,
+                    accel_group,
+                );
+                gtk_menu.append(&item);
+                (Some(item.upcast::<gtk::MenuItem>()), None)
+            }
             MenuEntryType::Native(native_menu_item) => {
                 native_menu_item.add_to_gtk_menu(gtk_menu);
                 (None, None)
@@ -373,6 +491,9 @@ fn add_entries_to_menu<M: IsA<gtk::MenuShell>>(
             }
             MenuEntryType::Text(native_items) => {
                 native_items.push(item.unwrap());
+            }
+             MenuEntryType::Check(native_items) => {
+                native_items.push(item.unwrap().downcast().unwrap());
             }
             MenuEntryType::Native(_) => {}
         };
@@ -414,6 +535,34 @@ fn create_gtk_text_menu_item(
     item
 }
 
+fn create_gtk_check_menu_item(
+    label: &str,
+    enabled: bool,
+    checked: bool,
+    accelerator: &Option<String>,
+    id: u64,
+    accel_group: &gtk::AccelGroup,
+) -> gtk::CheckMenuItem {
+    let item = gtk::CheckMenuItem::with_mnemonic(&to_gtk_menemenoic(label));
+    item.set_sensitive(enabled);
+    item.set_active(checked);
+    if let Some(accelerator) = accelerator {
+        let (key, modifiers) = gtk::accelerator_parse(&to_gtk_accelerator(accelerator));
+        item.add_accelerator(
+            "activate",
+            accel_group,
+            key,
+            modifiers,
+            gtk::AccelFlags::VISIBLE,
+        );
+    }
+    item.connect_activate(move |_| {
+        let _ = crate::MENU_CHANNEL.0.send(crate::MenuEvent { id });
+    });
+    item.show();
+    item
+}
+
 impl NativeMenuItem {
     fn add_to_gtk_menu<M: IsA<gtk::MenuShell>>(&self, gtk_menu: &M) {
         match self {

src/platform_impl/macos/accelerator.rs

@@ -2,9 +2,7 @@ use cocoa::appkit::NSEventModifierFlags;
 
 /// Mnemonic is deprecated since macOS 10
 pub fn remove_mnemonic(string: impl AsRef<str>) -> String {
-    string
-        .as_ref()
-        .replace("&", "")
+    string.as_ref().replace("&", "")
 }
 
 /// Returns a tuple of (Key, Modifier)

src/platform_impl/macos/menu_item.rs

@@ -25,8 +25,8 @@ pub struct TextMenuItem {
 }
 
 impl TextMenuItem {
-    pub fn new(
-        label: impl AsRef<str>,
+    pub fn new<S: AsRef<str>>(
+        label: S,
         enabled: bool,
         selector: Sel,
         accelerator: Option<&str>,
@@ -52,7 +52,7 @@ impl TextMenuItem {
         self.label.to_string()
     }
 
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         unsafe {
             let title = NSString::alloc(nil).init_str(&remove_mnemonic(&label));
             self.ns_menu_item.setTitle_(title);

src/platform_impl/macos/mod.rs

@@ -25,7 +25,7 @@ impl Menu {
         }
     }
 
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         let menu = Menu::new();
         let menu_item = TextMenuItem::new("", enabled, sel!(fireMenubarAction:), None);
 
@@ -64,7 +64,7 @@ impl Submenu {
         self.menu_item.label()
     }
 
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         let label = remove_mnemonic(label);
         self.menu_item.set_label(&label);
         unsafe {
@@ -81,13 +81,13 @@ impl Submenu {
         self.menu_item.set_enabled(_enabled)
     }
 
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         self.menu.add_submenu(label, enabled)
     }
 
-    pub fn add_text_item(
+    pub fn add_text_item<S: AsRef<str>>(
         &mut self,
-        label: impl AsRef<str>,
+        label: S,
         enabled: bool,
         accelerator: Option<&str>,
     ) -> TextMenuItem {

src/platform_impl/windows/accelerator.rs

@@ -1,7 +1,7 @@
 use windows_sys::Win32::UI::WindowsAndMessaging::{FALT, FCONTROL, FSHIFT, FVIRTKEY};
 
 /// Returns a tuple of (Key, Modifier, a string representation to be used in menu items)
-pub fn parse_accelerator(accelerator: impl AsRef<str>) -> (u16, u32, String) {
+pub fn parse_accelerator<S: AsRef<str>>(accelerator: S) -> (u16, u32, String) {
     let accelerator = accelerator.as_ref();
     let mut s = accelerator.split("+");
     let count = s.clone().count();

src/platform_impl/windows/mod.rs

@@ -16,19 +16,17 @@ use windows_sys::Win32::{
             AppendMenuW, CloseWindow, CreateAcceleratorTableW, CreateMenu, DrawMenuBar,
             EnableMenuItem, GetMenuItemInfoW, MessageBoxW, PostQuitMessage, SetMenu,
             SetMenuItemInfoW, ShowWindow, ACCEL, HACCEL, HMENU, MB_ICONINFORMATION, MENUITEMINFOW,
-            MFS_DISABLED, MF_DISABLED, MF_ENABLED, MF_GRAYED, MF_POPUP, MF_SEPARATOR, MF_STRING,
-            MIIM_STATE, MIIM_STRING, SW_MINIMIZE, WM_COMMAND,
+            MFS_CHECKED, MFS_DISABLED, MF_CHECKED, MF_DISABLED, MF_ENABLED, MF_GRAYED, MF_POPUP,
+            MF_SEPARATOR, MF_STRING, MF_UNCHECKED, MIIM_STATE, MIIM_STRING, SW_MINIMIZE,
+            WM_COMMAND,
         },
     },
 };
 
 use self::accelerator::parse_accelerator;
 
-const MENU_SUBCLASS_ID: usize = 200;
 const COUNTER_START: u64 = 1000;
 static COUNTER: Counter = Counter::new_with_start(COUNTER_START);
-const ABOUT_COUNTER_START: u64 = 400;
-static ABOUT_COUNTER: Counter = Counter::new_with_start(ABOUT_COUNTER_START);
 
 struct InnerMenu {
     hmenu: HMENU,
@@ -48,7 +46,7 @@ impl Menu {
         })))
     }
 
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         let hmenu = unsafe { CreateMenu() };
         let mut flags = MF_POPUP;
         if !enabled {
@@ -111,7 +109,10 @@ impl Menu {
     }
 }
 
+const ABOUT_COUNTER_START: u64 = 400;
+static ABOUT_COUNTER: Counter = Counter::new_with_start(ABOUT_COUNTER_START);
 static mut ABOUT_MENU_ITEMS: Lazy<HashMap<u64, NativeMenuItem>> = Lazy::new(|| HashMap::new());
+static mut CHECK_MENU_ITEMS: Lazy<Vec<CheckMenuItem>> = Lazy::new(|| Vec::new());
 
 #[derive(Clone)]
 pub struct Submenu {
@@ -140,7 +141,7 @@ impl Submenu {
         decode_wide(info.dwTypeData)
     }
 
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         let mut info: MENUITEMINFOW = unsafe { std::mem::zeroed() };
         info.cbSize = std::mem::size_of::<MENUITEMINFOW>() as _;
         info.fMask = MIIM_STRING;
@@ -169,7 +170,7 @@ impl Submenu {
         };
     }
 
-    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+    pub fn add_submenu<S: AsRef<str>>(&mut self, label: S, enabled: bool) -> Submenu {
         let hmenu = unsafe { CreateMenu() };
         let mut flags = MF_POPUP;
         if !enabled {
@@ -190,9 +191,9 @@ impl Submenu {
         }
     }
 
-    pub fn add_text_item(
+    pub fn add_text_item<S: AsRef<str>>(
         &mut self,
-        label: impl AsRef<str>,
+        label: S,
         enabled: bool,
         accelerator: Option<&str>,
     ) -> TextMenuItem {
@@ -261,6 +262,19 @@ impl Submenu {
             )
         };
     }
+
+    pub fn add_check_item<S: AsRef<str>>(
+        &mut self,
+        label: S,
+        enabled: bool,
+        checked: bool,
+        accelerator: Option<&str>,
+    ) -> CheckMenuItem {
+        let mut item = CheckMenuItem(self.add_text_item(label, enabled, accelerator));
+        item.set_checked(checked);
+        unsafe { CHECK_MENU_ITEMS.push(item.clone()) };
+        item
+    }
 }
 
 #[derive(Clone)]
@@ -296,7 +310,7 @@ impl TextMenuItem {
         decode_wide(info.dwTypeData)
     }
 
-    pub fn set_label(&mut self, label: impl AsRef<str>) {
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
         let mut label = label.as_ref().to_string();
         let prev_label = self.label_with_accel();
         if let Some(accel_str) = prev_label.split("\t").nth(1) {
@@ -337,6 +351,54 @@ impl TextMenuItem {
     }
 }
 
+#[derive(Clone)]
+pub struct CheckMenuItem(TextMenuItem);
+
+impl CheckMenuItem {
+    pub fn label(&self) -> String {
+        self.0.label()
+    }
+
+    pub fn set_label<S: AsRef<str>>(&mut self, label: S) {
+        self.0.set_label(label)
+    }
+
+    pub fn enabled(&self) -> bool {
+        self.0.enabled()
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        self.0.set_enabled(enabled)
+    }
+
+    pub fn checked(&self) -> bool {
+        let mut info: MENUITEMINFOW = unsafe { std::mem::zeroed() };
+        info.cbSize = std::mem::size_of::<MENUITEMINFOW>() as _;
+        info.fMask = MIIM_STATE;
+
+        unsafe { GetMenuItemInfoW(self.0.parent_hmenu, self.0.id as _, false.into(), &mut info) };
+
+        !((info.fState & MFS_CHECKED) == 0)
+    }
+
+    pub fn set_checked(&mut self, checked: bool) {
+        use windows_sys::Win32::UI::WindowsAndMessaging;
+        unsafe {
+            WindowsAndMessaging::CheckMenuItem(
+                self.0.parent_hmenu,
+                self.0.id as _,
+                if checked { MF_CHECKED } else { MF_UNCHECKED },
+            )
+        };
+    }
+
+    pub fn id(&self) -> u64 {
+        self.0.id()
+    }
+}
+
+const MENU_SUBCLASS_ID: usize = 200;
+
 unsafe extern "system" fn menu_subclass_proc(
     hwnd: HWND,
     msg: u32,
@@ -351,6 +413,12 @@ unsafe extern "system" fn menu_subclass_proc(
 
         // Custom menu items
         if COUNTER_START <= id && id <= COUNTER.current() {
+            // Toggle check menu items
+            // TODO: check the behavior in gtk
+            if let Some(item) = CHECK_MENU_ITEMS.iter_mut().find(|i| i.id() == id) {
+                item.set_checked(!item.checked());
+            }
+
             let _ = crate::MENU_CHANNEL.0.send(crate::MenuEvent { id });
             ret = 0;
         };

src/platform_impl/windows/util.rs

@@ -1,5 +1,5 @@
 #[cfg(target_os = "windows")]
-pub fn encode_wide(string: impl AsRef<std::ffi::OsStr>) -> Vec<u16> {
+pub fn encode_wide<S: AsRef<std::ffi::OsStr>>(string: S) -> Vec<u16> {
     std::os::windows::prelude::OsStrExt::encode_wide(string.as_ref())
         .chain(std::iter::once(0))
         .collect()