refactor(examples): use crossterm event methods (#1792)

Crossterm 0.29 introduced methods to easily check / extract the event
type. E.g. as_key_press_event() and is_key_press(). This commit
updates the examples to use these methods instead of matching on
the event type. This makes the code cleaner and easier to read.

Also does a general cleanup of the event handling code in the examples.

examples/apps/async-github/src/main.rs

@@ -31,7 +31,7 @@ use std::sync::{Arc, RwLock};
 use std::time::Duration;
 
 use color_eyre::Result;
-use crossterm::event::{Event, EventStream, KeyCode, KeyEventKind};
+use crossterm::event::{Event, EventStream, KeyCode};
 use octocrab::params::pulls::Sort;
 use octocrab::params::Direction;
 use octocrab::Page;
@@ -70,14 +70,14 @@ impl App {
 
         while !self.should_quit {
             tokio::select! {
-                _ = interval.tick() => { terminal.draw(|frame| self.draw(frame))?; },
+                _ = interval.tick() => { terminal.draw(|frame| self.render(frame))?; },
                 Some(Ok(event)) = events.next() => self.handle_event(&event),
             }
         }
         Ok(())
     }
 
-    fn draw(&self, frame: &mut Frame) {
+    fn render(&self, frame: &mut Frame) {
         let vertical = Layout::vertical([Constraint::Length(1), Constraint::Fill(1)]);
         let [title_area, body_area] = vertical.areas(frame.area());
         let title = Line::from("Ratatui async example").centered().bold();
@@ -86,14 +86,12 @@ impl App {
     }
 
     fn handle_event(&mut self, event: &Event) {
-        if let Event::Key(key) = event {
-            if key.kind == KeyEventKind::Press {
-                match key.code {
-                    KeyCode::Char('q') | KeyCode::Esc => self.should_quit = true,
-                    KeyCode::Char('j') | KeyCode::Down => self.pull_requests.scroll_down(),
-                    KeyCode::Char('k') | KeyCode::Up => self.pull_requests.scroll_up(),
-                    _ => {}
-                }
+        if let Some(key) = event.as_key_press_event() {
+            match key.code {
+                KeyCode::Char('q') | KeyCode::Esc => self.should_quit = true,
+                KeyCode::Char('j') | KeyCode::Down => self.pull_requests.scroll_down(),
+                KeyCode::Char('k') | KeyCode::Up => self.pull_requests.scroll_up(),
+                _ => {}
             }
         }
     }