commit a46c53dbe9001e081262072946bc79beb527bb92
Author: amrbashir <amr.bashir2015@gmail.com>
Date:   Thu May 5 13:50:22 2022 +0200

    init - initial linux support

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..96ef6c0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..c73b8b7
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "menu-rs"
+version = "0.0.0"
+edition = "2021"
+
+[target.'cfg(target_os = "windows")'.dependencies]
+windows-sys = { version = "0.34", features = [
+    "Win32_UI_WindowsAndMessaging",
+    "Win32_Foundation",
+    "Win32_Graphics_Gdi"
+] }
+
+[target.'cfg(target_os = "linux")'.dependencies]
+parking_lot = "0.12.0"
+gtk = "0.15"
+
+[dev-dependencies]
+winit = "0.26"
+tao = { path = "../tao", default-features = false }
diff --git a/examples/tao.rs b/examples/tao.rs
new file mode 100644
index 0000000..949759e
--- /dev/null
+++ b/examples/tao.rs
@@ -0,0 +1,51 @@
+use menu_rs::Menu;
+#[cfg(target_os = "linux")]
+use tao::platform::unix::WindowExtUnix;
+#[cfg(target_os = "windows")]
+use tao::platform::windows::WindowExtWindows;
+use tao::{
+    event::{Event, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::WindowBuilder,
+};
+fn main() {
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
+    let window2 = WindowBuilder::new().build(&event_loop).unwrap();
+
+    let mut menu_bar = Menu::new();
+    let mut file_menu = menu_bar.add_submenu("File", true);
+    let mut edit_menu = menu_bar.add_submenu("Edit", true);
+
+    let _open_item = file_menu.add_text_item("Open", true);
+    let mut save_item = file_menu.add_text_item("Save", true);
+    let _quit_item = file_menu.add_text_item("Quit", true);
+
+    let _copy_item = edit_menu.add_text_item("Copy", true);
+    let _cut_item = edit_menu.add_text_item("Cut", true);
+
+    #[cfg(target_os = "windows")]
+    menu_bar.init_for_hwnd(window.hwnd() as _);
+    #[cfg(target_os = "linux")]
+    menu_bar.init_for_gtk_window(window.gtk_window());
+    #[cfg(target_os = "linux")]
+    menu_bar.init_for_gtk_window(window2.gtk_window());
+
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                save_item.set_enabled(false);
+                save_item.set_label("Save disabled");
+            }
+            Event::MainEventsCleared => {
+                window.request_redraw();
+            }
+            _ => (),
+        }
+    })
+}
diff --git a/examples/winit.rs b/examples/winit.rs
new file mode 100644
index 0000000..d3ed363
--- /dev/null
+++ b/examples/winit.rs
@@ -0,0 +1,43 @@
+use menu_rs::Menu;
+#[cfg(target_os = "windows")]
+use winit::platform::windows::WindowExtWindows;
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::WindowBuilder,
+};
+fn main() {
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
+
+    let mut menu_bar = Menu::new();
+    let mut file_menu = menu_bar.add_submenu("File", true);
+    let mut edit_menu = menu_bar.add_submenu("Edit", true);
+
+    let _open_item = file_menu.add_text_item("Open", true);
+    let mut save_item = file_menu.add_text_item("Save", true);
+    let _quit_item = file_menu.add_text_item("Quit", true);
+
+    let _copy_item = edit_menu.add_text_item("Copy", true);
+    let _cut_item = edit_menu.add_text_item("Cut", true);
+
+    #[cfg(target_os = "windows")]
+    menu_bar.init_for_hwnd(window.hwnd() as _);
+
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                save_item.set_enabled(false);
+            }
+            Event::MainEventsCleared => {
+                window.request_redraw();
+            }
+            _ => (),
+        }
+    })
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..d93f8d5
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,63 @@
+mod platform_impl;
+mod util;
+
+pub struct Menu(platform_impl::Menu);
+
+impl Menu {
+    pub fn new() -> Self {
+        Self(platform_impl::Menu::new())
+    }
+
+    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+        Submenu(self.0.add_submenu(label, enabled))
+    }
+
+    pub fn add_text_item(&mut self, label: impl AsRef<str>, enabled: bool) -> TextMenuItem {
+        TextMenuItem(self.0.add_text_item(label, enabled))
+    }
+
+    #[cfg(target_os = "linux")]
+    pub fn init_for_gtk_window<W>(&self, w: &W)
+    where
+        W: gtk::prelude::IsA<gtk::Container>,
+    {
+        self.0.init_for_gtk_window(w)
+    }
+}
+
+#[derive(Clone)]
+pub struct Submenu(platform_impl::Submenu);
+
+impl Submenu {
+    pub fn set_label(&mut self, label: impl AsRef<str>) {
+        self.0.set_label(label)
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        self.0.set_enabled(enabled)
+    }
+    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+        Submenu(self.0.add_submenu(label, enabled))
+    }
+
+    pub fn add_text_item(&mut self, label: impl AsRef<str>, enabled: bool) -> TextMenuItem {
+        TextMenuItem(self.0.add_text_item(label, enabled))
+    }
+}
+
+#[derive(Clone)]
+pub struct TextMenuItem(platform_impl::TextMenuItem);
+
+impl TextMenuItem {
+    pub fn set_label(&mut self, label: impl AsRef<str>) {
+        self.0.set_label(label)
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        self.0.set_enabled(enabled)
+    }
+
+    pub fn id(&self) -> u64 {
+        self.0.id()
+    }
+}
diff --git a/src/platform_impl/linux.rs b/src/platform_impl/linux.rs
new file mode 100644
index 0000000..ec8c514
--- /dev/null
+++ b/src/platform_impl/linux.rs
@@ -0,0 +1,230 @@
+use parking_lot::Mutex;
+use std::sync::Arc;
+
+use gtk::{prelude::*, Orientation};
+
+use crate::util::Counter;
+
+const COUNTER: Counter = Counter::new();
+
+enum MenuEntryType {
+    Submenu,
+    Text,
+}
+
+struct MenuEntry {
+    label: String,
+    enabled: bool,
+    entries: Option<Vec<Arc<Mutex<MenuEntry>>>>,
+    etype: MenuEntryType,
+    menu_gtk_items: Option<Arc<Mutex<Vec<(gtk::MenuItem, gtk::Menu)>>>>,
+    item_gtk_items: Option<Arc<Mutex<Vec<gtk::MenuItem>>>>,
+}
+
+struct InnerMenu {
+    entries: Vec<Arc<Mutex<MenuEntry>>>,
+    gtk_items: Vec<(gtk::MenuBar, gtk::Box)>,
+}
+
+pub struct Menu(Arc<Mutex<InnerMenu>>);
+
+impl Menu {
+    pub fn new() -> Self {
+        Self(Arc::new(Mutex::new(InnerMenu {
+            entries: Vec::new(),
+            gtk_items: Vec::new(),
+        })))
+    }
+
+    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+        let label = label.as_ref().to_string();
+        let gtk_items = Arc::new(Mutex::new(Vec::new()));
+        let entry = Arc::new(Mutex::new(MenuEntry {
+            label: label.clone(),
+            enabled,
+            entries: Some(Vec::new()),
+            etype: MenuEntryType::Submenu,
+            menu_gtk_items: Some(gtk_items.clone()),
+            item_gtk_items: None,
+        }));
+        self.0.lock().entries.push(entry.clone());
+        Submenu {
+            label,
+            enabled,
+            entry,
+            gtk_items,
+        }
+    }
+
+    pub fn add_text_item(&mut self, label: impl AsRef<str>, enabled: bool) -> TextMenuItem {
+        let label = label.as_ref().to_string();
+        let gtk_items = Arc::new(Mutex::new(Vec::new()));
+        let entry = Arc::new(Mutex::new(MenuEntry {
+            label: label.clone(),
+            enabled,
+            entries: None,
+            etype: MenuEntryType::Text,
+            menu_gtk_items: None,
+            item_gtk_items: Some(gtk_items.clone()),
+        }));
+        self.0.lock().entries.push(entry.clone());
+        TextMenuItem {
+            label,
+            enabled,
+            entry,
+            gtk_items,
+            id: COUNTER.next(),
+        }
+    }
+
+    pub fn init_for_gtk_window<W>(&self, w: &W)
+    where
+        W: IsA<gtk::Container>,
+    {
+        let menu_bar = gtk::MenuBar::new();
+        add_entries_to_menu(&menu_bar, &self.0.lock().entries);
+
+        let vbox = gtk::Box::new(Orientation::Vertical, 0);
+        vbox.pack_start(&menu_bar, false, false, 0);
+        w.add(&vbox);
+        vbox.show_all();
+
+        self.0.lock().gtk_items.push((menu_bar, vbox));
+    }
+}
+
+fn add_entries_to_menu<M: IsA<gtk::MenuShell>>(gtk_menu: &M, entries: &Vec<Arc<Mutex<MenuEntry>>>) {
+    for entry in entries {
+        let mut entry = entry.lock();
+        let gtk_item = gtk::MenuItem::with_label(&entry.label);
+        gtk_menu.append(&gtk_item);
+        gtk_item.set_sensitive(entry.enabled);
+        if let MenuEntryType::Submenu = entry.etype {
+            let gtk_menu = gtk::Menu::new();
+            gtk_item.set_submenu(Some(&gtk_menu));
+            add_entries_to_menu(&gtk_menu, entry.entries.as_ref().unwrap());
+            entry
+                .menu_gtk_items
+                .as_mut()
+                .unwrap()
+                .lock()
+                .push((gtk_item, gtk_menu));
+        } else {
+            entry.item_gtk_items.as_mut().unwrap().lock().push(gtk_item);
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct Submenu {
+    label: String,
+    enabled: bool,
+    entry: Arc<Mutex<MenuEntry>>,
+    gtk_items: Arc<Mutex<Vec<(gtk::MenuItem, gtk::Menu)>>>,
+}
+
+impl Submenu {
+    pub fn set_label(&mut self, label: impl AsRef<str>) {
+        let label = label.as_ref().to_string();
+        for (item, _) in self.gtk_items.lock().iter() {
+            item.set_label(&label);
+        }
+
+        self.label = label.clone();
+        self.entry.lock().label = label;
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        for (item, _) in self.gtk_items.lock().iter() {
+            item.set_sensitive(enabled);
+        }
+
+        self.enabled = enabled;
+        self.entry.lock().enabled = enabled;
+    }
+
+    pub fn add_submenu(&mut self, label: impl AsRef<str>, enabled: bool) -> Submenu {
+        let label = label.as_ref().to_string();
+        let gtk_items = Arc::new(Mutex::new(Vec::new()));
+        let entry = Arc::new(Mutex::new(MenuEntry {
+            label: label.clone(),
+            enabled,
+            entries: Some(Vec::new()),
+            etype: MenuEntryType::Submenu,
+            menu_gtk_items: Some(gtk_items.clone()),
+            item_gtk_items: None,
+        }));
+        self.entry
+            .lock()
+            .entries
+            .as_mut()
+            .unwrap()
+            .push(entry.clone());
+        Submenu {
+            label,
+            enabled,
+            entry,
+            gtk_items,
+        }
+    }
+
+    pub fn add_text_item(&mut self, label: impl AsRef<str>, enabled: bool) -> TextMenuItem {
+        let label = label.as_ref().to_string();
+        let gtk_items = Arc::new(Mutex::new(Vec::new()));
+        let entry = Arc::new(Mutex::new(MenuEntry {
+            label: label.clone(),
+            enabled,
+            entries: None,
+            etype: MenuEntryType::Text,
+            menu_gtk_items: None,
+            item_gtk_items: Some(gtk_items.clone()),
+        }));
+        self.entry
+            .lock()
+            .entries
+            .as_mut()
+            .unwrap()
+            .push(entry.clone());
+        TextMenuItem {
+            label,
+            enabled,
+            entry,
+            gtk_items,
+            id: COUNTER.next(),
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct TextMenuItem {
+    label: String,
+    enabled: bool,
+    entry: Arc<Mutex<MenuEntry>>,
+    gtk_items: Arc<Mutex<Vec<gtk::MenuItem>>>,
+    id: u64,
+}
+
+impl TextMenuItem {
+    pub fn set_label(&mut self, label: impl AsRef<str>) {
+        let label = label.as_ref().to_string();
+        for item in self.gtk_items.lock().iter() {
+            item.set_label(&label);
+        }
+
+        self.label = label.clone();
+        self.entry.lock().label = label;
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        for item in self.gtk_items.lock().iter() {
+            item.set_sensitive(enabled);
+        }
+
+        self.enabled = enabled;
+        self.entry.lock().enabled = enabled;
+    }
+
+    pub fn id(&self) -> u64 {
+        self.id
+    }
+}
diff --git a/src/platform_impl/mod.rs b/src/platform_impl/mod.rs
new file mode 100644
index 0000000..82eb2d1
--- /dev/null
+++ b/src/platform_impl/mod.rs
@@ -0,0 +1,8 @@
+pub use self::platform_impl::*;
+
+#[cfg(target_os = "windows")]
+#[path = "windows.rs"]
+mod platform_impl;
+#[cfg(target_os = "linux")]
+#[path = "linux.rs"]
+mod platform_impl;
diff --git a/src/platform_impl/windows.rs b/src/platform_impl/windows.rs
new file mode 100644
index 0000000..942e241
--- /dev/null
+++ b/src/platform_impl/windows.rs
@@ -0,0 +1,137 @@
+use windows_sys::Win32::UI::WindowsAndMessaging::{
+    AppendMenuW, CreateMenu, EnableMenuItem, SetMenu, SetMenuItemInfoW, HMENU, MENUITEMINFOW,
+    MF_BYCOMMAND, MF_DISABLED, MF_ENABLED, MF_GRAYED, MF_POPUP, MF_STRING, MIIM_STRING,
+};
+
+use crate::{util::encode_wide, MenuEntry, IDS_COUNTER};
+
+pub struct MenuBar(HMENU);
+
+impl MenuBar {
+    pub fn new() -> Self {
+        Self(unsafe { CreateMenu() })
+    }
+
+    pub fn add_entry<M: MenuEntry>(&mut self, entry: &mut M) {
+        let mut flags = 0;
+        let id;
+
+        if entry.is_menu() {
+            flags |= MF_POPUP;
+            let menu = entry.platform_menu().unwrap();
+            id = menu.hmenu as _;
+            menu.parent = self.0;
+        } else {
+            flags |= MF_STRING;
+            let item = entry.platform_item().unwrap();
+            id = item.id as _;
+            item.parent = self.0;
+        };
+
+        if !entry.enabled() {
+            flags |= MF_GRAYED;
+        }
+
+        unsafe {
+            AppendMenuW(self.0, flags, id, encode_wide(entry.title()).as_mut_ptr());
+        }
+    }
+
+    pub fn init_for_hwnd(&self, hwnd: isize) {
+        unsafe { SetMenu(hwnd, self.0) };
+    }
+}
+
+pub struct Menu {
+    hmenu: HMENU,
+    parent: HMENU,
+}
+
+impl Menu {
+    pub fn new(_title: impl Into<String>) -> Self {
+        Self {
+            hmenu: unsafe { CreateMenu() },
+            parent: 0,
+        }
+    }
+
+    pub fn id(&self) -> u64 {
+        self.hmenu as u64
+    }
+
+    pub fn set_title(&mut self, title: impl Into<String>) {
+        let mut item_info: MENUITEMINFOW = unsafe { std::mem::zeroed() };
+        item_info.cbSize = std::mem::size_of::<MENUITEMINFOW>() as _;
+        item_info.fMask = MIIM_STRING;
+        item_info.dwTypeData = encode_wide(title.into()).as_mut_ptr();
+
+        unsafe { SetMenuItemInfoW(self.parent, self.hmenu as u32, false.into(), &item_info) };
+    }
+
+    pub fn set_enabled(&mut self, enabled: bool) {
+        let enabled = if enabled { MF_ENABLED } else { MF_DISABLED };
+        unsafe { EnableMenuItem(self.parent, self.hmenu as u32, MF_BYCOMMAND | enabled) };
+    }
+
+    pub fn add_entry<M: MenuEntry>(&mut self, entry: &mut M) {
+        let mut flags = 0;
+        let id;
+
+        if entry.is_menu() {
+            flags |= MF_POPUP;
+            let menu = entry.platform_menu().unwrap();
+            id = menu.hmenu as _;
+            menu.parent = self.hmenu;
+        } else {
+            flags |= MF_STRING;
+            let item = entry.platform_item().unwrap();
+            id = item.id as _;
+            item.parent = self.hmenu;
+        };
+
+        if !entry.enabled() {
+            flags |= MF_GRAYED;
+        }
+
+        unsafe {
+            AppendMenuW(
+                self.hmenu,
+                flags,
+                id,
+                encode_wide(entry.title()).as_mut_ptr(),
+            );
+        }
+    }
+}
+
+pub struct MenuItem {
+    id: u64,
+    parent: HMENU,
+}
+
+impl MenuItem {
+    pub fn new(_title: impl Into<String>) -> Self {
+        Self {
+            id: IDS_COUNTER.next(),
+            parent: 0,
+        }
+    }
+
+    pub fn id(&self) -> u64 {
+        self.id
+    }
+
+    pub fn set_title(&self, title: impl Into<String>) {
+        let mut item_info: MENUITEMINFOW = unsafe { std::mem::zeroed() };
+        item_info.cbSize = std::mem::size_of::<MENUITEMINFOW>() as _;
+        item_info.fMask = MIIM_STRING;
+        item_info.dwTypeData = encode_wide(title.into()).as_mut_ptr();
+
+        unsafe { SetMenuItemInfoW(self.parent, self.id as u32, false.into(), &item_info) };
+    }
+
+    pub fn set_enabled(&self, enabled: bool) {
+        let enabled = if enabled { MF_ENABLED } else { MF_DISABLED };
+        unsafe { EnableMenuItem(self.parent, self.id as u32, MF_BYCOMMAND | enabled) };
+    }
+}
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..13a36ac
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,20 @@
+use std::sync::atomic::{AtomicU64, Ordering};
+
+pub(crate) struct Counter(AtomicU64);
+
+impl Counter {
+    pub(crate) const fn new() -> Self {
+        Self(AtomicU64::new(1))
+    }
+
+    pub(crate) fn next(&self) -> u64 {
+        self.0.fetch_add(1, Ordering::Release)
+    }
+}
+
+#[cfg(target_os = "windows")]
+pub fn encode_wide(string: impl AsRef<std::ffi::OsStr>) -> Vec<u16> {
+    std::os::windows::prelude::OsStrExt::encode_wide(string.as_ref())
+        .chain(std::iter::once(0))
+        .collect()
+}