jsonedit/src/Editor/Menu.php

<?php

namespace NoccyLabs\JsonEdit\Editor;

use NoccyLabs\JsonEdit\Terminal\Terminal;

class Menu
{
    
    const U_CORNER_TOPLEFT = "\u{250c}";
    const U_CORNER_TOPRIGHT = "\u{2510}";
    const U_CORNER_BOTTOMLEFT = "\u{2514}";
    const U_CORNER_BOTTOMRIGHT = "\u{2518}";

    const U_CORNER_ROUNDED_TOPLEFT = "\u{256d}";
    const U_CORNER_ROUNDED_TOPRIGHT = "\u{256e}";
    const U_CORNER_ROUNDED_BOTTOMLEFT = "\u{2570}";
    const U_CORNER_ROUNDED_BOTTOMRIGHT = "\u{256f}";

    const U_EDGE_HORIZONTAL = "\u{2500}";

    const U_EDGE_VERTICAL = "\u{2502}";
    const U_EDGE_VERTICAL_SCROLL = "\u{250a}";
    const U_EDGE_VERTICAL_THUMB = "\u{2503}";
    const U_EDGE_VERTICAL_LEFT = "\u{2524}";
    const U_EDGE_VERTICAL_RIGHT = "\u{251c}";

    private int $index = 0;

    private int $scroll = 0;

    public function __construct(private Terminal $terminal, private array $items, private string $title = 'Menu')
    {

    }

    public function display(int $left, int $top, int $width, int $height = 0, string|int|null $value): mixed
    {

        [$w,$h] = $this->terminal->getSize();
        if ($height == 0) {
            $height = min($h - 5, count($this->items) + 2);
        }
        if ($left == 0) {
            $left = round(($w - $width) / 2);
        }
        if ($top == 0) {
            $top = round(($h - $height) / 2);
        }

        $this->redraw($left, $top, $width, $height);

        $showing = true;
        while ($showing) {
            while (null === ($ch = $this->terminal->readKey())) {
                usleep(10000);
            }
            if (mb_strlen($ch) == 1) {
                if ($ch == "\x03") {
                    $showing = false;
                }
                if ($ch == "\r") {
                    return array_keys($this->items)[$this->index];
                }
            } else {
                if ($ch == "k{UP}") {
                    $this->index--;
                    if ($this->index < 0) $this->index = count($this->items) - 1;
                    $this->redraw($left, $top, $width, $height);
                } elseif ($ch == "k{DOWN}") {
                    $this->index++;
                    if ($this->index >= count($this->items)) $this->index = 0;
                    $this->redraw($left, $top, $width, $height);
                }
            }
        }


        return null;
    }

    private function redraw(int $left, int $top, int $width, int $height) {

        $visibleItems = $height - 2;

        $scrollTop = $this->scroll;
        $scrollVisible = $visibleItems / count($this->items); // / $visibleItems;
        $scrollBottom = $scrollTop + $scrollVisible;
        $thumbTop = round($scrollTop * $visibleItems);
        $thumbBottom = round($visibleItems * $scrollBottom);

        // draw head
        echo "\e[40;37m";
        $this->terminal
            ->writeAt($left, $top + 0, self::U_CORNER_ROUNDED_TOPLEFT.str_repeat(self::U_EDGE_HORIZONTAL,$width - 2).self::U_CORNER_ROUNDED_TOPRIGHT)
            //->writeAt($left, $top + 1, self::U_EDGE_VERTICAL.str_repeat(" ",$width - 2).self::U_EDGE_VERTICAL)
            //->writeAt($left + 2, $top + 1, "\e[1m" . $this->title . "\e[22m")
            //->writeAt($left, $top + 2, self::U_EDGE_VERTICAL_RIGHT.str_repeat(self::U_EDGE_HORIZONTAL,$width - 2).self::U_EDGE_VERTICAL_LEFT)
            ->writeAt($left, $top + $height - 1, self::U_CORNER_BOTTOMLEFT.str_repeat(self::U_EDGE_HORIZONTAL,$width - 2).self::U_CORNER_BOTTOMRIGHT)
            ;
        $keys = array_keys($this->items);
        for ($n = 0; $n < $visibleItems; $n++) {
            $key = $keys[$n]??null;
            $item =  ($key ? ($this->items[$key]) : null);
            if ($item === "---") {
                $item = "\e[2m".str_repeat("\u{2500}", $width - 2)."\e[22m";
            } elseif (is_null($item)) {
                $item = str_repeat(" ", $width - 2);
            } else {
                $item = " " . $item . str_repeat(" ", $width - 3 - $this->itemlen($item)) . "\e[40;37m";
                $item = (($n == $this->index)?"\e[37;44m":"\e[40;37m") . $item;
            }
            if ($n >= $thumbTop && $n <= $thumbBottom) {
                $scrollbar = "\e[97;1m".self::U_EDGE_VERTICAL_THUMB."\e[40;37;22m";
            } else {
                $scrollbar = "\e[37;2m".self::U_EDGE_VERTICAL_SCROLL."\e[40;37;22m";
            }
            $this->terminal
                ->writeAt($left, $top + 1 + $n, self::U_EDGE_VERTICAL.$item.$scrollbar);
        }
        echo "\e[0m";
    }

    private function itemlen(string $item): int
    {
        $item = preg_replace('<\e\[.+?m>', '', $item);
        return mb_strlen($item);
    }

}