lib: Add example

examples/hello.rs

@@ -0,0 +1,64 @@
+use anyhow::Result;
+
+use radicle_tui as tui;
+
+use termion::event::Key;
+use tui::store;
+use tui::ui::widget::text::{Paragraph, ParagraphProps};
+use tui::ui::widget::{Properties, Widget};
+use tui::{Channel, Exit};
+
+#[derive(Clone, Debug)]
+struct State {
+    welcome: String,
+}
+
+enum Message {
+    Quit,
+    ReverseWelcome,
+}
+
+impl store::State<()> for State {
+    type Message = Message;
+
+    fn update(&mut self, message: Self::Message) -> Option<tui::Exit<()>> {
+        match message {
+            Message::Quit => Some(Exit { value: None }),
+            Message::ReverseWelcome => {
+                self.welcome = self.welcome.chars().rev().collect::<String>();
+                None
+            }
+        }
+    }
+
+    fn tick(&self) {}
+}
+
+#[tokio::main]
+pub async fn main() -> Result<()> {
+    let channel = Channel::default();
+    let state = State {
+        welcome: "Hello TUI".to_string(),
+    };
+
+    let welcome = Paragraph::new(&state, channel.tx.clone())
+        .on_update(|state| {
+            ParagraphProps::default()
+                .text(&state.welcome.clone().into())
+                .to_boxed()
+        })
+        .on_event(|paragraph, key| {
+            paragraph
+                .downcast_mut::<Paragraph<'_, State, Message>>()
+                .and_then(|paragraph| match key {
+                    Key::Char('r') => paragraph.send(Message::ReverseWelcome).ok(),
+                    Key::Char('q') => paragraph.send(Message::Quit).ok(),
+                    _ => None,
+                });
+        })
+        .to_boxed();
+
+    tui::run(channel, state, welcome).await?;
+
+    Ok(())
+}