ampache/lib/class/ajax.class.php

<?php
/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
/**
 * Ajax Class
 *
 *
 * LICENSE: GNU General Public License, version 2 (GPLv2)
 * Copyright (c) 2001 - 2011 Ampache.org All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License v2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * @package	Ampache
 * @copyright	2001 - 2011 Ampache.org
 * @license	http://opensource.org/licenses/gpl-2.0 GPLv2
 * @link	http://www.ampache.org/
 */

/**
 * Ajax class
 *
 * This class is specifically for setting up/printing out ajax related
 * elements onto a page. It takes care of the observing and all that 
 * raz-a-ma-taz.
 *
 * @package	Ampache
 * @copyright	2001 - 2011 Ampache.org
 * @link	http://www.ampache.org/
 */
class Ajax {

	private static $include_override;

	/**
	 * constructor
	 * This is what is called when the class is loaded
	 */
	public function __construct() {

		// Rien a faire

	} // constructor

	/**
	 * observe
	 * This returns a string with the correct and full ajax 'observe' stuff
	 * from prototype
	 */
	public static function observe($source,$method,$action,$post='') {

		$non_quoted = array('document','window');

		if (in_array($source,$non_quoted)) {
			$source_txt = $source;
		}
		else {
			$source_txt = "'$source'";
		}

		// If it's a post then we need to stop events
		if ($post) {
			$action  = 'Event.stop(e); ' . $action;
		}

		$observe	= "<script type=\"text/javascript\">";
		$observe	.= "Event.observe($source_txt,'$method',function(e){" . $action . ";});";
		$observe	.= "</script>";

		return $observe;

	} // observe

	/**
	 * action
	 * This takes the action, the source and the post (if passed) and
	 * generates the full ajax link
	 */
	public static function action($action,$source,$post='') {

		$url = Config::get('ajax_url') . $action;

		$non_quoted = array('document','window');

		if (in_array($source,$non_quoted)) {
			$source_txt = $source;
		}
		else {
			$source_txt = "'$source'";
		}

		if ($post) {
			$ajax_string = "ajaxPost('$url','$post',$source_txt)";
		}
		else {
			$ajax_string = "ajaxPut('$url',$source_txt)";
		}
		
		return $ajax_string;

	} // action

	/**
	 * button
	 * This prints out an img of the specified icon with the specified alt
	 * text and then sets up the required ajax for it.
	 */
	public static function button($action,$icon,$alt,$source='',$post='',$class='') {

		// Get the correct action
		$ajax_string = self::action($action,$source,$post);

		// If they passed a span class
		if ($class) {
			$class = ' class="' . $class . '"';
		}

		$string = get_user_icon($icon,$alt);

		// Generate an <a> so that it's more compliant with older
		// browsers (ie :hover actions) and also to unify linkbuttons
		// (w/o ajax) display
		$string = "<a href=\"javascript:void(0);\" id=\"$source\" $class>".$string."</a>\n";

		$string .= self::observe($source,'click',$ajax_string);

		return $string;

	} // button

	/**
	 * text
	 * This prints out the specified text as a link and sets up the required
	 * ajax for the link so it works correctly
	 */
	public static function text($action,$text,$source,$post='',$class='') {

		// Format the string we wanna use
		$ajax_string = self::action($action,$source,$post);

		// If they passed a span class
		if ($class) {
			$class = ' class="' . $class . '"';
		}

		// If we pass a source put it in the ID
		$string = "<a href=\"javascript:void(0);\" id=\"$source\" $class>$text</a>\n";

		$string .= self::observe($source,'click',$ajax_string);

		return $string;

	} // text

	/**
	 * run
	 * This runs the specified action no questions asked
	 */
	public static function run($action) {

		echo "<script type=\"text/javascript\"><!--\n";
		echo "$action";
		echo "\n--></script>";

	} // run

	/**
 	 * set_include_override
	 * This sets the including div override, used only one place. Kind of a
	 * hack.
	 */
	public static function set_include_override($value) {

		self::$include_override = make_bool($value);

	} // set_include_override

	/**
 	 * start_container
	 * This checks to see if we're AJAXin'. If we aren't then it echoes out
	 * the html needed to start a container that can be replaced by Ajax.
	 */
	public static function start_container($name) {

		if (defined('AJAX_INCLUDE') && !self::$include_override) { return true; }

		echo '<div id="' . scrub_out($name) . '">';

	} // start_container

	/**
	 * end_container
	 * This ends the container if we're not doing the AJAX thing
	 */
	public static function end_container() {

		if (defined('AJAX_INCLUDE') && !self::$include_override) { return true; }

		echo "</div>";

		self::$include_override = false;

	} // end_container

} // end Ajax class
?>