//
// o File    : nvscroll.js
// o Author  : Kukjin Kang
// o Date    : 2004. 7. 6
// o Cont.   : scroll object
//

function NvScroll() {

	this.version = "0.2";
	this.name = "NvScroll";
	this.item = new Array();
	this.itemcount = 0;
	this.currentspeed = 0;
	this.scrollspeed = 50;
	this.pausedelay = 1000;
	this.pausemouseover = false;
	this.stop = false;
	this.type = 1;
	this.height = 100;
	this.width = 100;
	this.stopHeight=0;
	this.i=0;

	this.add = function () {
		var text = arguments[0];

		this.item[this.itemcount] = text;
	//	alert(this.item[this.itemcount]);
		this.itemcount ++;
	};

	this.add2 = function () {
		var url = arguments[0];
		var title = arguments[1];
		this.item[this.itemcount] = "<a href=" + url + ">" + title + "</a>";
		this.itemcount = this.itemcount + 1;
	};

	this.reset_item = function () {
		this.item = new Array();
		this.itemcount = 0;
	};

	this.start = function (layer_name) {
		if ( this.itemcount == 1 ) {
			this.add(this.item[0]);
		}
		if (layer_name != null)
		{
			document.getElementById(layer_name).innerHTML = '<xmp>'+this.str_ret()+'</xmp>';
		}
		else 
		{
			this.display();
		}
		this.currentspeed = this.scrollspeed;
		if ( this.type == 1 || this.type == 2 ) {
			this.stop = true;
			setTimeout(this.name+'.scroll()',this.currentspeed);
			window.setTimeout(this.name+".stop = false", this.pausedelay);
		} else if ( this.type == 3 ) {
			this.stop = true;
			setTimeout(this.name+'.rolling()',this.currentspeed);
			window.setTimeout(this.name+".stop = false", this.pausedelay);
		}
	};

	this.display = function () {
		document.write('<div id="'+this.name+'" style="height:'+this.height+'px; width:'+this.width+'px; position:relative; overflow:hidden; " OnMouseOver="'+this.name+'.onmouseover(); " OnMouseOut="'+this.name+'.onmouseout(); ">');
		for(var i = 0; i < this.itemcount; i++) {
			if ( this.type == 1 ) {
				document.write('<div id="'+this.name+'item'+i+'"style="left:0px; width:'+this.width+'px; position:absolute; top:'+(this.height*i)+'px; ">');
				document.write(this.item[i]);
				document.write('</div>');
			} else if ( this.type == 2 || this.type == 3 ) {
				document.write('<div id="'+this.name+'item'+i+'"style="left:'+(this.width*i)+'px; width:'+this.width+'px; position:absolute; top:0px; ">');
				document.write(this.item[i]);
				document.write('</div>');
			}
		}
		document.write('</div>');
	};
	// ¹Ù·Î µð½ºÇ÷¹ÀÌ ¾Ê°í ½ºÆ®¸µ ¸®ÅÏÇϵµ·Ï Ãß°¡ 2006-03-30
	this.str_ret = function () {
		var str = '<div id="'+this.name+'" style="height:'+this.height+'; width:'+this.width+'; position:relative; overflow:hidden; " OnMouseOver="'+this.name+'.onmouseover(); " OnMouseOut="'+this.name+'.onmouseout(); ">';
		for(var i = 0; i < this.itemcount; i++) {
			if ( this.type == 1 ) {
				str += '<div id="'+this.name+'item'+i+'"style="left:0px; width:'+this.width+'; position:absolute; top:'+(this.height*i)+'px; ">';
				str += this.item[i];
				str += '</div>';
			} else if ( this.type == 2 || this.type == 3 ) {
				str += '<div id="'+this.name+'item'+i+'"style="left:'+(this.width*i)+'px; width:'+this.width+'; position:absolute; top:0px; ">';
				str += this.item[i];
				str += '</div>';
			}
		}
				str += '</div>';
				return str;
	};

	this.scroll = function () {

		if ( this.pause == true ) {

			window.setTimeout(this.name+".scroll()",this.pausedelay);
			this.pause = false;

		} else {

			this.currentspeed = this.scrollspeed;
			if ( !this.stop ) {
				for (i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name+'item'+i).style;
					if ( this.type == 1 ) {
						obj.top = (parseInt(obj.top) - 1)+'px';
						if ( parseInt(obj.top) <= this.height * (-1) ) obj.top = (this.height * (this.itemcount-1))+'px';
						if ( parseInt(obj.top) == 0 ) this.currentspeed = this.pausedelay;
					} else if ( this.type == 2 ) {
						obj.left = (parseInt(obj.left) - 1)+'px';
						if ( parseInt(obj.left) <= this.width * (-1) ) obj.left = (this.width * (this.itemcount-1))+'px';
						if ( parseInt(obj.left) == 0 ) this.currentspeed = this.pausedelay;
					}
				}
			}
			window.setTimeout(this.name+".scroll()",this.currentspeed);
		}
	};

	this.rolling = function () {
		if ( this.stop == false  ) {
			this.next();
		}
		window.setTimeout(this.name+".rolling()",this.scrollspeed);
	}

	this.onmouseover = function () {
		if ( this.pausemouseover ) {
			this.stop = true;
		}
	};

	this.onmouseout = function () {
		if ( this.pausemouseover ) {
			this.stop = false;
		}
	};

	this.next = function() {

		for (i = 0; i < this.itemcount; i++) {
			obj = document.getElementById(this.name+'item'+i).style;
			if(this.type = 1) {
				if ( parseInt(obj.top) < 1 ) {
					top_ = this.height + parseInt(obj.top);
					break;
				}
			} else {
				if ( parseInt(obj.left) < 1 ) {
					width = this.width + parseInt(obj.left);
					break;
				}
			}
		}
		for (i = 0; i < this.itemcount; i++) {
			obj = document.getElementById(this.name+'item'+i).style;
			if(this.type = 1) {
				if ( parseInt(obj.top) < 1 ) { 
					obj.top = (this.height * (this.itemcount-1))+'px';
				} else {
					obj.top = (parseInt(obj.top) - top_)+'px';
				}
			} else {
				if ( parseInt(obj.left) < 1 ) { 
					obj.left = (this.width * (this.itemcount-1))+'px';
				} else {
					obj.left = (parseInt(obj.left) - width)+'px';
				}
			}
		}

	}

	this.prev = function() {

		for (i = 0; i < this.itemcount; i++) {
			var obj = document.getElementById(this.name+'item'+i).style;
			if(this.type = 1) {
				if ( parseInt(obj.top) < 1 ) { 
					var top_ = parseInt(obj.top) * (-1);
					break;
				}
			} else {
				if ( parseInt(obj.left) < 1 ) { 
					var width = parseInt(obj.left) * (-1);
					break;
				}
			}
		}
		if(this.type = 1) {
			if ( top_ == 0 ) {
				var total_top = this.height * (this.itemcount-1);
				for (i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name+'item'+i).style;
					if ( parseInt(obj.top) + 1 > total_top ) { 
						obj.top = 0;
					} else {
						obj.top = (parseInt(obj.top) + this.height)+'px';
					}
				}
			} else {
				for (i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name+'item'+i).style;
					if ( parseInt(obj.top) < 1 ) { 
						obj.top = 0;
					} else {
						obj.top = (parseInt(obj.top) + top_)+'px';
					}
				}
			}
		} else {
			if ( width == 0 ) {
				total_width = this.width * (this.itemcount-1);
				for (i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name+'item'+i).style;
					if ( parseInt(obj.left) + 1 > total_width ) { 
						obj.left = 0;
					} else {
						obj.left = parseInt(obj.left) + this.width;
					}
				}
			} else {
				for (i = 0; i < this.itemcount; i++) {
					obj = document.getElementById(this.name+'item'+i).style;
					if ( parseInt(obj.left) < 1 ) { 
						obj.left = 0;
					} else {
						obj.left = parseInt(obj.left) + width;
					}
				}
			}
		}
	}

	this.unext = function () {
		this.onmouseover();
		this.next();
		window.setTimeout(this.name+".onmouseout()",this.pausedelay);
	}

	this.uprev = function () {
		this.onmouseover();
		this.prev();
		window.setTimeout(this.name+".onmouseout()",this.pausedelay);
	}

}