Fix rustbox example

examples/rustbox.rs

@@ -5,17 +5,16 @@ use rustbox::Key;
 use std::error::Error;
 
 use tui::backend::RustboxBackend;
-use tui::layout::{Constraint, Direction, Layout};
 use tui::style::{Color, Modifier, Style};
-use tui::widgets::{Block, Borders, Paragraph, Widget};
+use tui::widgets::{Block, Borders, Paragraph, Text, Widget};
 use tui::Terminal;
 
-fn main() {
+fn main() -> Result<(), failure::Error> {
     let mut terminal = Terminal::new(RustboxBackend::new().unwrap()).unwrap();
     terminal.clear().unwrap();
     terminal.hide_cursor().unwrap();
-    draw(&mut terminal);
     loop {
+        draw(&mut terminal)?;
         match terminal.backend().rustbox().poll_event(false) {
             Ok(rustbox::Event::KeyEvent(key)) => if key == Key::Char('q') {
                 break;
@@ -23,25 +22,25 @@ fn main() {
             Err(e) => panic!("{}", e.description()),
             _ => {}
         };
-        draw(&mut terminal);
     }
-    terminal.show_cursor().unwrap();
+    terminal.show_cursor()?;
+    Ok(())
 }
 
-fn draw(t: &mut Terminal<RustboxBackend>) {
+fn draw(t: &mut Terminal<RustboxBackend>) -> Result<(), std::io::Error> {
-    let size = t.size().unwrap();
+    let size = t.size()?;
-    {
+    let text = [
-        let mut f = t.get_frame();
+        Text::raw("It "),
-        Paragraph::default()
+        Text::styled("works", Style::default().fg(Color::Yellow)),
+    ];
+    t.draw(|mut f| {
+        Paragraph::new(text.iter())
             .block(
                 Block::default()
                     .title("Rustbox backend")
                     .title_style(Style::default().fg(Color::Yellow).modifier(Modifier::Bold))
                     .borders(Borders::ALL)
                     .border_style(Style::default().fg(Color::Magenta)),
-            ).text("It {yellow works}!")
+            ).render(&mut f, size)
-            .render(&mut f, &size);
+    })
-    }
-
-    t.draw().unwrap();
 }