94 lines
2.9 KiB
PHP
94 lines
2.9 KiB
PHP
<?php declare(strict_types=1);
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class ArrowkeyNavigation extends Extension
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{
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/**
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* Adds functionality for post/view on images.
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*/
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public function onDisplayingImage(DisplayingImageEvent $event)
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{
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$prev_url = make_http(make_link("post/prev/".$event->image->id));
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$next_url = make_http(make_link("post/next/".$event->image->id));
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$this->add_arrowkeys_code($prev_url, $next_url);
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}
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/**
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* Adds functionality for post/list.
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*/
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public function onPageRequest(PageRequestEvent $event)
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{
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if ($event->page_matches("post/list")) {
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$pageinfo = $this->get_list_pageinfo($event);
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$prev_url = make_http(make_link("post/list/".$pageinfo["prev"]));
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$next_url = make_http(make_link("post/list/".$pageinfo["next"]));
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$this->add_arrowkeys_code($prev_url, $next_url);
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}
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}
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/**
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* Adds the javascript to the page with the given urls.
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*/
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private function add_arrowkeys_code(string $prev_url, string $next_url)
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{
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global $page;
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$page->add_html_header("<script type=\"text/javascript\">
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(function($){
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$(document).keyup(function(e) {
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if($(e.target).is('input', 'textarea')){ return; }
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if (e.metaKey || e.ctrlKey || e.altKey || e.shiftKey) { return; }
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if (e.keyCode == 37) { window.location.href = '{$prev_url}'; }
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else if (e.keyCode == 39) { window.location.href = '{$next_url}'; }
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});
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})(jQuery);
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</script>", 60);
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}
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/**
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* Returns info about the current page number.
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*/
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private function get_list_pageinfo(PageRequestEvent $event): array
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{
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global $config, $database;
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// get the amount of images per page
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$images_per_page = $config->get_int(IndexConfig::IMAGES);
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if ($event->count_args() > 1) {
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// if there are tags, use pages with tags
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$prefix = url_escape($event->get_arg(0)) . "/";
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$page_number = $event->try_page_num(1);
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$total_pages = ceil($database->get_one(
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"SELECT count FROM tags WHERE tag=:tag",
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["tag"=>$event->get_arg(0)]
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) / $images_per_page);
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} else {
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// if there are no tags, use default
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$prefix = "";
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$page_number = $event->try_page_num(0);
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$total_pages = ceil($database->get_one(
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"SELECT COUNT(*) FROM images"
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) / $images_per_page);
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}
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// creates previous & next values
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// When previous first page, go to last page
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if ($page_number <= 1) {
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$prev = $total_pages;
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} else {
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$prev = $page_number-1;
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}
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if ($page_number >= $total_pages) {
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$next = 1;
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} else {
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$next = $page_number+1;
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}
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// Create return array
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return [
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"prev" => $prefix.$prev,
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"next" => $prefix.$next,
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];
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}
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}
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