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1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Pdf\Core\Annotation;
6
7use Phpdftk\Pdf\Core\PdfDictionary;
8use Phpdftk\Pdf\Core\PdfReference;
9use Phpdftk\Pdf\Core\Serializable;
10use Phpdftk\Pdf\Core\PdfVersion;
11use Phpdftk\Pdf\Core\RequiresPdfVersion;
12
13/**
14 * PDF Appearance dictionary (ISO 32000-2 Table 170).
15 *
16 * Defines the visual appearance of an annotation in various states.
17 * Assigned to the /AP entry of annotation dictionaries.
18 *
19 * Example:
20 *   $ap = new AppearanceDict();
21 *   $ap->n = new PdfReference($normalAppearance->objectNumber);
22 *   $annotation->ap = $ap;
23 */
24#[RequiresPdfVersion(PdfVersion::V1_2)]
25class AppearanceDict implements Serializable
26{
27    public PdfReference|PdfDictionary|null $n = null;  // /N - normal appearance
28    public PdfReference|PdfDictionary|null $r = null;  // /R - rollover appearance
29    public PdfReference|PdfDictionary|null $d = null;  // /D - down appearance
30
31    public function toPdf(): string
32    {
33        $dict = new PdfDictionary();
34
35        if ($this->n !== null) {
36            $dict->set('N', $this->n);
37        }
38        if ($this->r !== null) {
39            $dict->set('R', $this->r);
40        }
41        if ($this->d !== null) {
42            $dict->set('D', $this->d);
43        }
44
45        return $dict->toPdf();
46    }
47}