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File / Folder	Size	Action
.	-
Colors.php	3.756KB	edt ren
Cursor.php	1.18KB	edt ren
Erase.php	0.597KB	edt ren
Events.php	0.735KB	edt ren
FakesInputOutput.php	2.6KB	edt ren
Fallback.php	1.398KB	edt ren
Interactivity.php	0.743KB	edt ren
Scrolling.php	2.911KB	edt ren
Termwind.php	0.515KB	edt ren
Themes.php	3.477KB	edt ren
Truncation.php	0.49KB	edt ren
TypedValue.php	4.307KB	edt ren

<?php

namespace Laravel\Prompts\Concerns;

use Laravel\Prompts\Themes\Contracts\Scrolling as ScrollingRenderer;

trait Scrolling
{
    /**
     * The number of items to display before scrolling.
     */
    public int $scroll;

/**
     * The index of the highlighted option.
     */
    public ?int $highlighted;

/**
     * The index of the first visible option.
     */
    public int $firstVisible = 0;

/**
     * Initialize scrolling.
     */
    protected function initializeScrolling(?int $highlighted = null): void
    {
        $this->highlighted = $highlighted;

$this->reduceScrollingToFitTerminal();
    }

/**
     * Reduce the scroll property to fit the terminal height.
     */
    protected function reduceScrollingToFitTerminal(): void
    {
        $reservedLines = ($renderer = $this->getRenderer()) instanceof ScrollingRenderer ? $renderer->reservedLines() : 0;

$this->scroll = min($this->scroll, $this->terminal()->lines() - $reservedLines);
    }

/**
     * Highlight the given index.
     */
    protected function highlight(?int $index): void
    {
        $this->highlighted = $index;

if ($this->highlighted === null) {
            return;
        }

if ($this->highlighted < $this->firstVisible) {
            $this->firstVisible = $this->highlighted;
        } elseif ($this->highlighted > $this->firstVisible + $this->scroll - 1) {
            $this->firstVisible = $this->highlighted - $this->scroll + 1;
        }
    }

/**
     * Highlight the previous entry, or wrap around to the last entry.
     */
    protected function highlightPrevious(int $total, bool $allowNull = false): void
    {
        if ($total === 0) {
            return;
        }

if ($this->highlighted === null) {
            $this->highlight($total - 1);
        } elseif ($this->highlighted === 0) {
            $this->highlight($allowNull ? null : ($total - 1));
        } else {
            $this->highlight($this->highlighted - 1);
        }
    }

/**
     * Highlight the next entry, or wrap around to the first entry.
     */
    protected function highlightNext(int $total, bool $allowNull = false): void
    {
        if ($total === 0) {
            return;
        }

if ($this->highlighted === $total - 1) {
            $this->highlight($allowNull ? null : 0);
        } else {
            $this->highlight(($this->highlighted ?? -1) + 1);
        }
    }

/**
     * Center the highlighted option.
     */
    protected function scrollToHighlighted(int $total): void
    {
        if ($this->highlighted < $this->scroll) {
            return;
        }

$remaining = $total - $this->highlighted - 1;
        $halfScroll = (int) floor($this->scroll / 2);
        $endOffset = max(0, $halfScroll - $remaining);

if ($this->scroll % 2 === 0) {
            $endOffset--;
        }

$this->firstVisible = $this->highlighted - $halfScroll - $endOffset;
    }
}