/**
 * @author wjjin
 */
//Updated 4/18/2003: Footprint decreased, minor code improvements.
//Updated 5/3/2003: Minor comment clarification; no code changes.
//Updated 5/10/2003: Minor code improvements.
// The constructor should be called with
// the parent object (optional, defaults to window).

function Timer(){
	this.obj = (arguments.length)?arguments[0]:window;
	return this;
}

// The set functions should be called with:
// - The name of the object method (as a string) (required)
// - The millisecond delay (required)
// - Any number of extra arguments, which will all be
// passed to the method when it is evaluated.

Timer.prototype.setInterval = function(func, msec){
	var i = Timer.getNew();
	var t = Timer.buildCall(this.obj, i, arguments);
	Timer.set[i].timer = window.setInterval(t,msec);
	return i;
	}
	Timer.prototype.setTimeout = function(func, msec){
	var i = Timer.getNew();
	Timer.buildCall(this.obj, i, arguments);
	Timer.set[i].timer = window.setTimeout("Timer.callOnce("+i+");",msec);
	return i;
}

// The clear functions should be called with
// the return value from the equivalent set function.

Timer.prototype.clearInterval = function(i){
	if(!Timer.set[i]) return;
	window.clearInterval(Timer.set[i].timer);
	Timer.set[i] = null;
	}
	Timer.prototype.clearTimeout = function(i){
	if(!Timer.set[i]) return;
	window.clearTimeout(Timer.set[i].timer);
	Timer.set[i] = null;
}

// Private data

Timer.set = new Array();
Timer.buildCall = function(obj, i, args){
	var t = "";
	Timer.set[i] = new Array();
	if(obj != window){
		Timer.set[i].obj = obj;
		t = "Timer.set["+i+"].obj.";
	}
	t += args[0]+"(";
	if(args.length > 2){
		Timer.set[i][0] = args[2];
		t += "Timer.set["+i+"][0]";
		for(var j=1; (j+2)<args.length; j++){
			Timer.set[i][j] = args[j+2];
			t += ", Timer.set["+i+"]["+j+"]";
		}
	}
	t += ");";
	Timer.set[i].call = t;
	return t;
}

Timer.callOnce = function(i){
	if(!Timer.set[i]) return;
	eval(Timer.set[i].call);
	Timer.set[i] = null;
}
Timer.getNew = function(){
	var i = 0;
	while(Timer.set[i]) i++;
	return i;
}


//Here's an example of the code in action:
//function Ticker(){
//this.count = 0;
//this.timer = new Timer(this);
//}
//Ticker.prototype.tick = function(d){
//this.count+=d;
//window.status = ""+this.count;
//this.timer.setTimeout("tick", 1000, d);
//}

//window.onload = function(){
//var ticker = new Ticker();
//ticker.tick(1);
//}