muda/README.md

muda is a Menu Utilities library for Desktop Applications.

## Example

Create the menu and add your items

```rs
let menu = Menu::new();
let menu_item2 = MenuItem::new("Menu item #2", false, None);
let submenu = Submenu::with_items("Submenu Outer", true,&[
  &MenuItem::new("Menu item #1", true, Some(Accelerator::new(Some(Modifiers::ALT), Code::KeyD))),
  &PredefinedMenuItem::separator(),
  &menu_item2,
  &MenuItem::new("Menu item #3", true, None),
  &PredefinedMenuItem::separator(),
  &Submenu::with_items("Submenu Inner", true,&[
    &MenuItem::new("Submenu item #1", true, None),
    &PredefinedMenuItem::separator(),
    &menu_item2,
  ])
]);

```

Then Add your root menu to a Window on Windows and Linux Only or use it
as your global app menu on macOS

```rs
// --snip--
#[cfg(target_os = "windows")]
menu.init_for_hwnd(window.hwnd() as isize);
#[cfg(target_os = "linux")]
menu.init_for_gtk_window(&gtk_window);
#[cfg(target_os = "macos")]
menu.init_for_nsapp();
```

## Context menus (Popup menus)

You can also use a [`Menu`] or a [`Submenu`] show a context menu.

```rs
// --snip--
let x = 100;
let y = 120;
#[cfg(target_os = "windows")]
menu.show_context_menu_for_hwnd(window.hwnd() as isize, x, y);
#[cfg(target_os = "linux")]
menu.show_context_menu_for_gtk_window(&gtk_window, x, y);
#[cfg(target_os = "macos")]
menu.show_context_menu_for_nsview(nsview, x, y);
```
## Processing menu events

You can use [`menu_event_receiver`](https://docs.rs/muda/latest/muda/fn.menu_event_receiver.html) to get a reference to the [`MenuEventReceiver`](https://docs.rs/muda/latest/muda/type.MenuEventReceiver.html)
which you can use to listen to events when a menu item is activated
```rs
if let Ok(event) = menu_event_receiver().try_recv() {
    match event.id {
        _ if event.id == save_item.id() => {
            println!("Save menu item activated");
        },
        _ => {}
    }
}
```

## Platform-specific notes:

### Accelerators on Windows

Accelerators don't work unless the win32 message loop calls
[`TranslateAcceleratorW`](https://docs.rs/windows-sys/latest/windows_sys/Win32/UI/WindowsAndMessaging/fn.TranslateAcceleratorW.html)

See [`Menu::init_for_hwnd`](https://docs.rs/muda/latest/muda/struct.Menu.html#method.init_for_hwnd) for more details

### Linux

`libxdo` is used to make the predfined `Copy`, `Cut`, `Paste` and `SelectAll` menu items work. Be sure to install following packages before building:

Arch Linux / Manjaro:
```sh
pacman -S xdotool
```

Debian / Ubuntu:
```sh
sudo apt install libxdo-dev
```