<?php
namespace Laravel\Prompts\Themes\Default\Concerns;
use Illuminate\Support\Collection;
trait DrawsScrollbars
{
/**
* Render a scrollbar beside the visible items.
*
* @param \Illuminate\Support\Collection<int, string> $visible
* @return \Illuminate\Support\Collection<int, string>
*/
protected function scrollbar(Collection $visible, int $firstVisible, int $height, int $total, int $width, string $color = 'cyan'): Collection
{
if ($height >= $total) {
return $visible;
}
$scrollPosition = $this->scrollPosition($firstVisible, $height, $total);
return $visible // @phpstan-ignore return.type
->values()
->map(fn ($line) => $this->pad($line, $width))
->map(fn ($line, $index) => match ($index) {
$scrollPosition => preg_replace('/.$/', $this->{$color}('┃'), $line),
default => preg_replace('/.$/', $this->gray('│'), $line),
});
}
/**
* Return the position where the scrollbar "handle" should be rendered.
*/
protected function scrollPosition(int $firstVisible, int $height, int $total): int
{
if ($firstVisible === 0) {
return 0;
}
$maxPosition = $total - $height;
if ($firstVisible === $maxPosition) {
return $height - 1;
}
if ($height <= 2) {
return -1;
}
$percent = $firstVisible / $maxPosition;
return (int) round($percent * ($height - 3)) + 1;
}
}