/*
 * Tooltip - jQuery plugin  for styled tooltips
 *
 * Copyright (c) 2006 Jörn Zaefferer, Stefan Petre
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */

/**
 * Display a customized tooltip instead of the default one
 * for every selected element. The tooltip behaviour mimics
 * the default one, but lets you style the tooltip and
 * specify the delay before displaying it.
 *
 * In addition, it displays the href value, if it is available.
 * To style the tooltip, use these selectors in your stylesheet:
 * #tooltip - The tooltip container
 * #tooltip h3 - The tooltip title
 * #tooltip p.body - The tooltip body, shown when using showBody
 * #tooltip p.url - The tooltip url, shown when using showURL
 *
 * @example $('a, input, img').Tooltip();
 * @desc Shows tooltips for anchors, inputs and images, if they have a title
 *
 * @example $('label').Tooltip({
 * delay: 0,
 * track: true,
 * event: "click"
 * });
 * @desc Shows tooltips for labels with no delay, tracking mousemovement, displaying the tooltip when the label is clicked.
 *
 * @example // modify global settings
 * $.extend($.fn.Tooltip.defaults, {
 * track: true,
 * delay: 0,
 * showURL: false,
 * showBody: " - ",
 * fixPNG: true
 * });
 * // setup fancy tooltips
 * $('a.pretty').Tooltip({
 * extraClass: "fancy"
 * });
 $('img.pretty').Tooltip({
 * extraClass: "fancy-img",
 * });
 * @desc This example starts with modifying the global settings, applying them to all following Tooltips; Afterwards, Tooltips for anchors with class pretty are created with an extra class for the Tooltip: "fancy" for anchors, "fancy-img" for images
 *
 * @param Object settings (optional) Customize your Tooltips
 * @option Number delay The number of milliseconds before a tooltip is display, default is 250
 * @option String event The event on which the tooltip is displayed, default is "mouseover", "click" works fine, too
 * @option Boolean track If true, let the tooltip track the mousemovement, default is false
 * @option Boolean showURL If true, shows the href or src attribute within p.url, default is true
 * @option String showBody If specified, uses the String to split the title, displaying the first part in the h3 tag, all following in the p.body tag, separated with <br/>s, default is null
 * @option String extraClass If specified, adds the class to the tooltip helper, default is null
 * @option Boolean fixPNG If true, fixes transparent PNGs in IE, default is false
 *
 * @name Tooltip
 * @type jQuery
 * @cat Plugins/Tooltip
 * @author Jörn Zaefferer (http://bassistance.de)
 */
(function($) {
// define variables and functions
var
// the tooltip element
helper,
// it's title part
tTitle,
// it's body part
tBody,
// it's url part
tUrl,
// the current tooltipped element
current,
// the title of the current element, used for restoring
oldTitle,
// timeout id for delayed tooltips
tID,
 
// the public plugin method
plugin = $.fn.Tooltip = function(settings)	{
// setup configuration
// TODO: allow multiple arguments to extend, see bug #344
settings = $.extend($.extend({}, arguments.callee.defaults), settings || {});
// there can be only one tooltip helper
if( !helper ) {
// create the helper, h3 for title, div for url
helper = $('<div id="tooltip"><h3></h3><p class="body"></p><p class="url"></p></div>')
// hide it at first
.hide()
// move to top and position absolute, to let it follow the mouse
.css({ position: 'absolute', zIndex: 3000 })
// add to document
.appendTo('body');
// save references to title and url elements
tTitle = $('h3', helper);
tBody = $('p:eq(0)', helper);
tUrl = $('p:eq(1)', helper);
}
// bind events for every selected element with a title attribute
$(this).filter('[@title]')

// save settings into each element
// TODO: pass settings via event system, not yet possible
.each(function() {
this.tSettings = settings;
})
// bind events
.bind("mouseover", save)
.bind(settings.event, handle);
return this;
},
	
// main event handler to start showing tooltips
handle = function(event) {
// show helper, either with timeout or on instant
if( this.tSettings.delay )
tID = setTimeout(show, this.tSettings.delay);
else
show();
  
// if selected, update the helper position when the mouse moves
if(this.tSettings.track)
$('body').bind('mousemove', update);
// update at least once
update(event);
// hide the helper when the mouse moves out of the element
$(this).bind('mouseout', hide);
},
	
// save elements title before the tooltip is displayed
save = function() {
// if this is the current source, or it has no title (occurs with click event), stop
if(this == current || !this.title)
return;
// save current
current = this;

var source = $(this),
settings = this.tSettings;
// save title, remove from element and set to helper
oldTitle = title = source.attr('title');
source.attr('title','');
if(settings.showBody) {
var parts = title.split(settings.showBody);
tTitle.html(parts.shift());
tBody.empty();
for(var i = 0, part; part = parts[i]; i++) {
if(i > 0)
tBody.append("<br/>");
tBody.append(part);
}
if(tBody.html())
tBody.show();
else
tBody.hide();
} else {
tTitle.html(title);
tBody.hide();
}

// if element has href or src, add and show it, otherwise hide it
href = (source.attr('href') || source.attr('src'));
if( settings.showURL && href )
tUrl.html(href.replace('http://', '')).show();
else 
tUrl.hide();
		
// add an optional class for this tip
if( settings.extraClass ) {
helper.addClass(settings.extraClass);
}
// fix PNG background for IE
if (settings.fixPNG && $.browser.msie ) {
helper.each(function () {
if (this.currentStyle.backgroundImage != 'none') {
var image = this.currentStyle.backgroundImage;
image = image.substring(5, image.length - 2);
$(this).css({
'backgroundImage': 'none',
'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
});
tPNGfix = true;
     }
   });
 }
},
	
// delete timeout and show helper
show = function() {
tID = null;
helper.show();
},
 
/**
* callback for mousemove
* updates the helper position
* removes itself when no current element
*/
update = function(event)	{
// if no current element is available, remove this listener
if( current == null ) {
$('body').unbind('mousemove', update);
return;	
}
 
// get the current mouse position
function pos(c) {
var p = c == 'X' ? 'Left' : 'Top';
return event['page' + c] || (event['client' + c] + (document.documentElement['scroll' + p] || document.body['scroll' + p])) || 0;
}
		
// position the helper 15 pixel to bottom right, starting from mouse position
helper.css({
top: pos('Y') + 0 + 'px',
left: pos('X') + 15 + 'px'
  });
},
	
// hide helper and restore added classes and the title
hide = function() {
// clear timeout if possible
if(tID)
clearTimeout(tID);
// no more current element
current = null;
helper.hide();
// remove optional class
if( this.tSettings.extraClass ) {
helper.removeClass( this.tSettings.extraClass);
}
		
// restore title and remove this listener
$(this)
.attr('title', oldTitle)
.unbind('mouseout', hide);
			
// remove PNG background fix for IE
if( this.tSettings.fixPNG && $.browser.msie ) {
helper.each(function () {
$(this).css({'filter': '', backgroundImage: ''});
      });
    }
};
	
// define global defaults, editable by client
plugin.defaults = {
delay: 250,
event: "mouseover",
track: false,
showURL: true,
showBody: null,
extraClass: null,
fixPNG: false
};

})(jQuery);