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Arrowkey Navigation

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Drudex Software 2013-06-19 20:56:19 +01:00 committed by Shish
parent 06dd72fe66
commit 668ebdcb2e
1 changed files with 89 additions and 0 deletions
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<?php
/**
* Name: Arrow Key Navigation
* Author: Drudex Software <support@drudexsoftware.com>
* Link: http://www.drudexsoftware.com/
* License: GPLv2
* Description: Allows viewers no navigate between images using the left & right arrow keys.
* Documentation:
* Simply enable this extention in the extention manager to enable arrow key navigation.
*/
class ArrowkeyNavigation extends Extension {
# Adds functionality for post/view on images
public function onDisplayingImage(DisplayingImageEvent $event) {
$prev_url = make_http(make_link("post/prev/".$event->image->id));
$next_url = make_http(make_link("post/next/".$event->image->id));
$this->add_arrowkeys_code($prev_url, $next_url);
}
# Adds functionality for post/list
public function onPageRequest(PageRequestEvent $event) {
if($event->page_matches("post/list")) {
$pageinfo = $this->get_list_pageinfo($event);
$prev_url = make_http(make_link("post/list/".$pageinfo["prev"]));
$next_url = make_http(make_link("post/list/".$pageinfo["next"]));
$this->add_arrowkeys_code($prev_url, $next_url);
}
}
# adds the javascript to the page with the given urls
private function add_arrowkeys_code($prev_url, $next_url) {
global $page;
$page->add_html_header("<script type=\"text/javascript\">
document.onkeyup=checkKeycode;
function checkKeycode(e)
{
var keycode;
if(window.event) keycode=window.event.keyCode;
else if(e) keycode=e.which;
if (e.srcElement.tagName != \"INPUT\")
{
if(keycode==\"37\") window.location.href='$prev_url';
else if(keycode==\"39\") window.location.href='$next_url';
}
}
</script>");
}
# returns info about the current page number
private function get_list_pageinfo($event) {
global $config, $database;
// get the amount of images per page
$images_per_page = $config->get_int('index_images');
// if there are no tags, use default
if ($event->get_arg(1) == null){
$prefix = "";
$page_number = (int)$event->get_arg(0);
$total_pages = ceil($database->get_one(
"SELECT COUNT(*) FROM images") / $images_per_page);
}
else { // if there are tags, use pages with tags
$prefix = $event->get_arg(0)."/";
$page_number = (int)$event->get_arg(1);
$total_pages = ceil($database->get_one(
"SELECT count FROM tags WHERE tag=:tag",
array("tag"=>$event->get_arg(0))) / $images_per_page);
}
// creates previous & next values
// When previous first page, go to last page
if ($page_number <= 1) $prev = $total_pages;
else $prev = $page_number-1;
if ($page_number >= $total_pages) $next = 1;
else $next = $page_number+1;
// Create return array
$pageinfo = array(
"prev" => $prefix.$prev,
"next" => $prefix.$next,
);
return $pageinfo;
}
}
?>