Add a presets Menu to the game_of_life example

core/src/menu.rs

@@ -41,7 +41,7 @@ impl<Message> Menu<Message> {
     ///
     /// This is useful to compose menus and split them into different
     /// abstraction levels.
-    pub fn map<B>(self, f: &impl Fn(Message) -> B) -> Menu<B> {
+    pub fn map<B>(self, f: impl Fn(Message) -> B + Copy) -> Menu<B> {
         // TODO: Use a boxed trait to avoid reallocation of entries
         Menu {
             entries: self
@@ -100,7 +100,7 @@ impl<Message> Entry<Message> {
         Self::Dropdown { title, submenu }
     }
 
-    fn map<B>(self, f: &impl Fn(Message) -> B) -> Entry<B> {
+    fn map<B>(self, f: impl Fn(Message) -> B + Copy) -> Entry<B> {
         match self {
             Self::Item {
                 title,

examples/game_of_life/src/main.rs

@@ -6,6 +6,7 @@ mod style;
 use grid::Grid;
 use iced::button::{self, Button};
 use iced::executor;
+use iced::menu::{self, Menu};
 use iced::pick_list::{self, PickList};
 use iced::slider::{self, Slider};
 use iced::time;
@@ -128,6 +129,13 @@ impl Application for GameOfLife {
         }
     }
 
+    fn menu(&self) -> Menu<Message> {
+        Menu::with_entries(vec![menu::Entry::dropdown(
+            "Presets",
+            Preset::menu().map(Message::PresetPicked),
+        )])
+    }
+
     fn view(&mut self) -> Element<Message> {
         let version = self.version;
         let selected_speed = self.next_speed.unwrap_or(self.speed);

examples/game_of_life/src/preset.rs

@@ -1,3 +1,5 @@
+use iced::menu::{self, Menu};
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Preset {
     Custom,
@@ -26,6 +28,17 @@ pub static ALL: &[Preset] = &[
 ];
 
 impl Preset {
+    pub fn menu() -> Menu<Self> {
+        Menu::with_entries(
+            ALL.iter()
+                .copied()
+                .map(|preset| {
+                    menu::Entry::item(preset.to_string(), None, preset)
+                })
+                .collect(),
+        )
+    }
+
     pub fn life(self) -> Vec<(isize, isize)> {
         #[rustfmt::skip]
         let cells = match self {