/*!
* jQuery Activity
* December 20, 2009
* Corey Hart @ http://www.codenothing.com
*/
(function($, undefined){
// Current Timestamp
function now(){
return (new Date).getTime();
}
// Attach activity object to jQuery base object
$.activity = {
// Variable Storage
defaults: {
// Users last active timestamp
lastActive: now(),
// Interval times in milliseconds
inactive: 1000*60*30, // Default inactive at 30 minutes
interval: 1000*60*5, // Default interval check every 5 minutes
// Callback functions when intervals are reached
inactiveFn: function(){},
intervalFn: function(){}
},
// Timerid
timer: undefined,
// Expose the current time fn
now: now,
// Starts the interval
init: function(options){
// Update vars with options
var self = this;
self.defaults = $.extend(self.defaults, options||{});
self.defaults.lastActive = now();
// Check activity on a continuous interval
self.bind();
return self.timer = setInterval(function(){ self.check(); }, self.defaults.interval);
},
// Updates lastActive to current/provided timestamp
update: function(time){
return (this.defaults.lastActive = time === undefined ? now() : time);
},
// Returns boolean indicator of activity
isActive: function(){
return (this.timer !== undefined);
},
// Getter for current activity
getActivity: function(){
var self = this, time = now();
return {diff: time-self.defaults.lastActive, time: time, lastActive: self.defaults.lastActive};
},
// Re-activates the interval (options only required if change to defaults wanted)
reActivate: function(options){
var self = this;
// Clear interval if still running
if (self.timer)
self.timer = clearInterval(self.timer);
// Reactivation
return self.init(options||{});
},
// Interval check function
check: function(){
var self = this,
time = now(),
diff = time - self.defaults.lastActive;
// Trigger appropriate callback
if (diff > self.defaults.inactive){
self.defaults.inactiveFn.call(self, {diff: diff, time: time, lastActive: self.defaults.lastActive});
return self.timer = clearInterval(self.timer);
}
else if (diff > self.defaults.interval){
self.defaults.intervalFn.call(self, {diff: diff, time: time, lastActive: self.defaults.lastActive});
}
// Rebind mouse tracking
return self.bind();
},
// Rebinds activity events 
bind: function(){
var self = this;
$(window).unbind('.activity').one('mousemove.activity keyup.activity', function(event){
self.defaults.lastActive = event.timeStamp;
});
return self;
}
};
})(jQuery);