71 lines
2.4 KiB
PHP
71 lines
2.4 KiB
PHP
<?php
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/**
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* Document Chapter Navigation
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*
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* Shows previous/next chapter navigation at the bottom of a document page.
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* Uses AKSRT_Docs_Presenter for chapter resolution.
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*
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* @package AKSRT
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*/
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defined('ABSPATH') || exit;
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$current_id = get_the_ID();
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$presenter = class_exists('AKSRT_Docs_Presenter') ? AKSRT_Docs_Presenter::get_instance() : null;
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if ($presenter) {
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$nav = $presenter->get_chapter_nav($current_id);
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$prev_page = $nav['prev'];
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$next_page = $nav['next'];
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} else {
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$parent_id = wp_get_post_parent_id($current_id);
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$siblings = get_pages([
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'parent' => $parent_id ?: 0,
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'sort_column' => 'menu_order, post_title',
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'sort_order' => 'ASC',
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'post_status' => 'publish',
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]);
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$current_index = -1;
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foreach ($siblings as $i => $sibling) {
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if ((int) $sibling->ID === $current_id) {
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$current_index = $i;
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break;
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}
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}
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$prev_page = $current_index > 0 ? $siblings[$current_index - 1] : null;
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$next_page = ($current_index >= 0 && $current_index < count($siblings) - 1)
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? $siblings[$current_index + 1]
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: null;
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}
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if (!$prev_page && !$next_page) return;
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?>
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<nav class="aksrt-doc-chapter-nav" aria-label="<?php esc_attr_e('章节导航', 'aksrt'); ?>">
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<?php if ($prev_page) : ?>
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<a href="<?php echo esc_url(get_permalink($prev_page->ID)); ?>" class="aksrt-doc-chapter-nav__prev">
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<span class="aksrt-doc-chapter-nav__label">
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<i class="fas fa-arrow-left"></i>
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<?php esc_html_e('上一篇', 'aksrt'); ?>
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</span>
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<span class="aksrt-doc-chapter-nav__title"><?php echo esc_html($prev_page->post_title); ?></span>
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</a>
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<?php else : ?>
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<div class="aksrt-doc-chapter-nav__prev aksrt-doc-chapter-nav__prev--disabled"></div>
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<?php endif; ?>
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<?php if ($next_page) : ?>
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<a href="<?php echo esc_url(get_permalink($next_page->ID)); ?>" class="aksrt-doc-chapter-nav__next">
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<span class="aksrt-doc-chapter-nav__label">
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<?php esc_html_e('下一篇', 'aksrt'); ?>
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<i class="fas fa-arrow-right"></i>
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</span>
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<span class="aksrt-doc-chapter-nav__title"><?php echo esc_html($next_page->post_title); ?></span>
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</a>
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<?php else : ?>
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<div class="aksrt-doc-chapter-nav__next aksrt-doc-chapter-nav__next--disabled"></div>
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<?php endif; ?>
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</nav>
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