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/static/scripts/jquery.event.hover.js

https://bitbucket.org/cistrome/cistrome-harvard/
JavaScript | 85 lines | 60 code | 8 blank | 17 comment | 10 complexity | 210e4e602473a1bed838bfd7e68fe84b MD5 | raw file
 1;(function($){ // secure $ jQuery alias
 2/*******************************************************************************************/	
 3// jquery.event.hover.js - rev 5 
 4// Copyright (c) 2008, Three Dub Media (http://threedubmedia.com)
 5// Liscensed under the MIT License (MIT-LICENSE.txt)
 6// http://www.opensource.org/licenses/mit-license.php
 7// Created: 2008-06-02 | Updated: 2008-07-30
 8/*******************************************************************************************/
 9
10//	USE THESE PROPERTIES TO CUSTOMIZE SETTINGS...
11
12//	$.event.special.hover.delay = 100; 
13//	Defines the delay (msec) while mouse is inside the element before checking the speed
14
15//	$.event.special.hover.speed = 100; 
16//	Defines the maximum speed (px/sec) the mouse may be moving to trigger the hover event
17
18// save the old jquery "hover" method
19$.fn._hover = $.fn.hover;
20
21// jquery method 
22$.fn.hover = function( fn1, fn2, fn3 ) {
23	if ( fn3 ) this.bind('hoverstart', fn1 ); // 3 args
24	if ( fn2 ) this.bind('hoverend', fn3 ? fn3 : fn2 ); // 2+ args
25	return !fn1 ? this.trigger('hover') // 0 args 
26		: this.bind('hover', fn3 ? fn2 : fn1 ); // 1+ args
27	};	
28
29// special event configuration
30var hover = $.event.special.hover = {
31	delay: 100, // milliseconds
32	speed: 100, // pixels per second
33	setup: function( data ){
34		data = $.extend({ speed: hover.speed, delay: hover.delay, hovered:0 }, data||{} );
35		$.event.add( this, "mouseenter mouseleave", hoverHandler, data );
36		},
37	teardown: function(){
38		$.event.remove( this, "mouseenter mouseleave", hoverHandler );
39		}
40	};
41
42// shared event handler
43function hoverHandler( event ){
44	var data = event.data || event;
45	switch ( event.type ){
46		case 'mouseenter': // mouseover
47			data.dist2 = 0; // init mouse distance?
48			data.event = event; // store the event
49			event.type = "hoverstart"; // hijack event
50			if ( $.event.handle.call( this, event ) !== false ){ // handle "hoverstart"
51				data.elem = this; // ref to the current element
52				$.event.add( this, "mousemove", hoverHandler, data ); // track the mouse
53				data.timer = setTimeout( compare, data.delay ); // start async compare
54				}
55			break;
56		case 'mousemove': // track the event, mouse distance? = x? + y?
57			data.dist2 += Math.pow( event.pageX-data.event.pageX, 2 ) 
58				+ Math.pow( event.pageY-data.event.pageY, 2 ); 
59			data.event = event; // store current event
60			break;
61		case 'mouseleave': // mouseout
62			clearTimeout( data.timer ); // uncompare
63			if ( data.hovered ){ 
64				event.type = "hoverend"; // hijack event
65				$.event.handle.call( this, event ); // handle "hoverend"
66				data.hovered--; // reset flag
67				}
68			else $.event.remove( data.elem, "mousemove", hoverHandler ); // untrack
69			break;
70		default: // timeout compare // distance? = x? + y?  = ( speed * time )?
71			if ( data.dist2 <= Math.pow( data.speed*( data.delay/1e3 ), 2 ) ){ // speed acceptable
72				$.event.remove( data.elem, "mousemove", hoverHandler ); // untrack
73				data.event.type = "hover"; // hijack event
74				if ( $.event.handle.call( data.elem, data.event ) !== false ) // handle "hover"
75					data.hovered++; // flag for "hoverend"
76				}
77			else data.timer = setTimeout( compare, data.delay ); // async recurse
78			data.dist2 = 0; // reset distance? for next compare
79			break;
80		}
81	function compare(){ hoverHandler( data ); }; // timeout/recursive function
82	};
83	
84/*******************************************************************************************/
85})(jQuery); // confine scope