use tui;
use tui::layout;
use tui::text;
use tui::block;
let header = block(#border:&`All, &text(&"Header"));
let content = block(#border:&`All, &text(&"Main Content"));
let footer = block(#border:&`All, &text(&"Footer"));
layout(
#direction: &`Vertical,
&[
child(#constraint: `Percentage(20), header),
child(#constraint: `Fill(1), content),
child(#constraint: `Percentage(20), footer)
]
)