graphix-stdlib 0.3.1

A dataflow language for UIs and network programming, standard library
Documentation 
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use tui;
use tui::list;
use tui::block;
use tui::text;
use tui::input_handler;

let items = [
    line("Apple"), line("Banana"), line("Cherry"),
    line("Date"), line("Elderberry"), line("Fig"), line("Grape")
];

let last = array::len(items) - 1;
let selected = 0;
let scroll_pos = 0;
let visible = 5;

// Auto-scroll to keep selection visible
scroll_pos <- select selected {
    s if s < scroll_pos => s,
    s if s > (scroll_pos + visible - 1) => s - visible + 1,
    _ => never()
};

let handle_event = |e: Event| -> [`Stop, `Continue] select e {
    `Key(k) => select k.kind {
        `Press => select k.code {
            k@`Up if selected > 0 => {
                selected <- (k ~ selected) - 1;
                `Stop
            },
            k@`Down if selected < last => {
                selected <- (k ~ selected) + 1;
                `Stop
            },
            k@`Home => { selected <- k ~ 0; `Stop },
            k@`End => { selected <- k ~ last; `Stop },
            _ => `Continue
        },
        _ => `Continue
    },
    _ => `Continue
};

input_handler(
    #handle: &handle_event,
    &block(
        #border: &`All,
        #title: &line("Fruit Selection"),
        &list(
            #highlight_style: &style(#fg: `Black, #bg: `Yellow),
            #highlight_symbol: &"▶ ",
            #selected: &selected,
            #scroll: &scroll_pos,
            &items
        )
    )
)