Initial menu implementation

examples/menu/Cargo.toml

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+[package]
+name = "menu"
+version = "0.1.0"
+authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+iced = { path = "../.." }
+iced_native = { path = "../../native" }

examples/menu/src/main.rs

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+use iced::{
+    executor, Application, Clipboard, Command, Container, Element, Length,
+    Menu, Settings, Text,
+};
+use iced_native::keyboard::{Hotkey, KeyCode, Modifiers};
+
+pub fn main() -> iced::Result {
+    App::run(Settings::default())
+}
+
+#[derive(Debug, Default)]
+struct App {
+    selected: Option<Entry>,
+}
+
+#[derive(Debug, Clone)]
+enum Entry {
+    One,
+    Two,
+    Three,
+    A,
+    B,
+    C,
+}
+
+#[derive(Debug, Clone)]
+enum Message {
+    MenuActivated(Entry),
+}
+
+impl Application for App {
+    type Executor = executor::Default;
+    type Message = Message;
+    type Flags = ();
+
+    fn new(_flags: ()) -> (App, Command<Message>) {
+        (App::default(), Command::none())
+    }
+
+    fn title(&self) -> String {
+        String::from("Menu - Iced")
+    }
+
+    fn menu(&self) -> Menu<Message> {
+        let alt = Modifiers {
+            alt: true,
+            control: false,
+            logo: false,
+            shift: false,
+        };
+        let ctrl_shift = Modifiers {
+            control: true,
+            shift: true,
+            logo: false,
+            alt: false,
+        };
+
+        Menu::new()
+            .dropdown(
+                "First",
+                Menu::new()
+                    .item(
+                        "One",
+                        Hotkey::new(alt, KeyCode::F1),
+                        Message::MenuActivated(Entry::One),
+                    )
+                    .item(
+                        "Two",
+                        Hotkey::new(alt, KeyCode::F2),
+                        Message::MenuActivated(Entry::Two),
+                    )
+                    .separator()
+                    .item(
+                        "Three",
+                        Hotkey::new(alt, KeyCode::F3),
+                        Message::MenuActivated(Entry::Three),
+                    ),
+            )
+            .dropdown(
+                "Second",
+                Menu::new()
+                    .item(
+                        "A",
+                        Hotkey::new(ctrl_shift, KeyCode::A),
+                        Message::MenuActivated(Entry::A),
+                    )
+                    .item(
+                        "B",
+                        Hotkey::new(ctrl_shift, KeyCode::B),
+                        Message::MenuActivated(Entry::B),
+                    )
+                    .separator()
+                    .item(
+                        "C",
+                        Hotkey::new(ctrl_shift, KeyCode::C),
+                        Message::MenuActivated(Entry::C),
+                    ),
+            )
+    }
+
+    fn update(
+        &mut self,
+        message: Message,
+        _clipboard: &mut Clipboard,
+    ) -> Command<Message> {
+        match message {
+            Message::MenuActivated(entry) => self.selected = Some(entry),
+        }
+
+        Command::none()
+    }
+
+    fn view(&mut self) -> Element<Message> {
+        Container::new(
+            Text::new(format!("Selected {:?}", self.selected)).size(48),
+        )
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .center_x()
+        .center_y()
+        .into()
+    }
+}