Implement pure version of pick_list example 🎉

examples/pure/pick_list/src/main.rs

@@ -0,0 +1,111 @@
+use iced::pure::widget::{
+    column, container, pick_list, scrollable, vertical_space,
+};
+use iced::pure::{Element, Sandbox};
+use iced::{Alignment, Length, Settings};
+
+pub fn main() -> iced::Result {
+    Example::run(Settings::default())
+}
+
+#[derive(Default)]
+struct Example {
+    selected_language: Option<Language>,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Message {
+    LanguageSelected(Language),
+}
+
+impl Sandbox for Example {
+    type Message = Message;
+
+    fn new() -> Self {
+        Self::default()
+    }
+
+    fn title(&self) -> String {
+        String::from("Pick list - Iced")
+    }
+
+    fn update(&mut self, message: Message) {
+        match message {
+            Message::LanguageSelected(language) => {
+                self.selected_language = Some(language);
+            }
+        }
+    }
+
+    fn view(&self) -> Element<Message> {
+        let pick_list = pick_list(
+            &Language::ALL[..],
+            self.selected_language,
+            Message::LanguageSelected,
+        )
+        .placeholder("Choose a language...");
+
+        let content = column()
+            .width(Length::Fill)
+            .align_items(Alignment::Center)
+            .spacing(10)
+            .push(vertical_space(Length::Units(600)))
+            .push("Which is your favorite language?")
+            .push(pick_list)
+            .push(vertical_space(Length::Units(600)));
+
+        container(scrollable(content))
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x()
+            .center_y()
+            .into()
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Language {
+    Rust,
+    Elm,
+    Ruby,
+    Haskell,
+    C,
+    Javascript,
+    Other,
+}
+
+impl Language {
+    const ALL: [Language; 7] = [
+        Language::C,
+        Language::Elm,
+        Language::Ruby,
+        Language::Haskell,
+        Language::Rust,
+        Language::Javascript,
+        Language::Other,
+    ];
+}
+
+impl Default for Language {
+    fn default() -> Language {
+        Language::Rust
+    }
+}
+
+impl std::fmt::Display for Language {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Language::Rust => "Rust",
+                Language::Elm => "Elm",
+                Language::Ruby => "Ruby",
+                Language::Haskell => "Haskell",
+                Language::C => "C",
+                Language::Javascript => "Javascript",
+                Language::Other => "Some other language",
+            }
+        )
+    }
+}