Update tests and docs to take size from the Frame

src/lib.rs

@@ -82,8 +82,8 @@
 //!     let stdout = io::stdout().into_raw_mode()?;
 //!     let backend = TermionBackend::new(stdout);
 //!     let mut terminal = Terminal::new(backend)?;
-//!     let size = terminal.size()?;
 //!     terminal.draw(|mut f| {
+//!         let size = f.size();
 //!         Block::default()
 //!             .title("Block")
 //!             .borders(Borders::ALL)
@@ -113,7 +113,6 @@
 //!     let stdout = io::stdout().into_raw_mode()?;
 //!     let backend = TermionBackend::new(stdout);
 //!     let mut terminal = Terminal::new(backend)?;
-//!     let size = terminal.size()?;
 //!     terminal.draw(|mut f| {
 //!         let chunks = Layout::default()
 //!             .direction(Direction::Vertical)
@@ -125,7 +124,7 @@
 //!                     Constraint::Percentage(10)
 //!                 ].as_ref()
 //!             )
-//!             .split(size);
+//!             .split(f.size());
 //!         Block::default()
 //!              .title("Block")
 //!              .borders(Borders::ALL)

tests/gauge.rs

@@ -11,14 +11,13 @@ use tui::Terminal;
 fn gauge_render() {
     let backend = TestBackend::new(40, 10);
     let mut terminal = Terminal::new(backend).unwrap();
-    let size = terminal.size().unwrap();
     terminal
         .draw(|mut f| {
             let chunks = Layout::default()
                 .direction(Direction::Vertical)
                 .margin(2)
                 .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
-                .split(size);
+                .split(f.size());
 
             Gauge::default()
                 .block(Block::default().title("Percentage").borders(Borders::ALL))