100 lines
2.9 KiB
PHP
100 lines
2.9 KiB
PHP
<?php
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/**
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* Name: Arrow Key Navigation
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* Author: Drudex Software <support@drudexsoftware.com>
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* Link: http://www.drudexsoftware.com/
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* License: GPLv2
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* Description: Allows viewers no navigate between images using the left & right arrow keys.
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* Documentation:
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* Simply enable this extention in the extention manager to enable arrow key navigation.
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*/
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class ArrowkeyNavigation extends Extension {
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/**
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* Adds functionality for post/view on images.
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*
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* @param DisplayingImageEvent $event
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*/
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public function onDisplayingImage(DisplayingImageEvent $event) {
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$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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* @param PageRequestEvent $event
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*/
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public function onPageRequest(PageRequestEvent $event) {
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if($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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* @param string $prev_url
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* @param string $next_url
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*/
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private function add_arrowkeys_code($prev_url, $next_url) {
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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($(e.target).is('input', 'textarea')){ return; }
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if (e.keyCode == 37) { window.location.href = '{$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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* @param PageRequestEvent $event
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* @return array
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*/
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private function get_list_pageinfo(PageRequestEvent $event) {
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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 = $config->get_int('index_images');
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// if there are no tags, use default
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if (is_null($event->get_arg(1))){
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$prefix = "";
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$page_number = int_escape($event->get_arg(0));
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$total_pages = ceil($database->get_one(
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"SELECT COUNT(*) FROM images") / $images_per_page);
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}
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else { // if there are tags, use pages with tags
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$prefix = url_escape($event->get_arg(0)) . "/";
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$page_number = int_escape($event->get_arg(1));
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$total_pages = ceil($database->get_one(
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"SELECT count FROM tags WHERE tag=:tag",
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array("tag"=>$event->get_arg(0))) / $images_per_page);
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}
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// creates previous & next values
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// When previous first page, go to last page
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if ($page_number <= 1) $prev = $total_pages;
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else $prev = $page_number-1;
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if ($page_number >= $total_pages) $next = 1;
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else $next = $page_number+1;
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// Create return array
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$pageinfo = array(
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"prev" => $prefix.$prev,
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"next" => $prefix.$next,
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);
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return $pageinfo;
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}
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}
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