/***************************************************************
 *  JS-TrackBar
 *
 *   Copyright (C) 2008 by Alexander Burtsev - webew.ru
 *   and abarmot - http://abarmot.habrahabr.ru/
 *   desing: �������� ��������� - http://my.mail.ru/bk/concur/
 *
 *  This code is a public domain.
 ***************************************************************/

var trackbar = { // NAMESPACE
	archive : {},
	getObject : function(id) {
		if (typeof this.archive[id] == "undefined") {
			this.archive[id] = new this.hotSearch(id);
		}
		return this.archive[id];
	}
};

trackbar.hotSearch = function(id) { // Constructor
	// Vars
	this.id = id;
	
	this.leftWidth = 0; // px
	this.rightWidth = 0; // px
	this.width = 0; // px
	this.intervalWidth = 0; // px
	
	this.leftLimit = 0;
	this.leftValue = 0;
	this.rightLimit = 0;
	this.rightValue = 0;
	this.valueInterval = 0;
	this.widthRem = 6;
	this.valueWidth = 0;
	this.roundUp = 0;
	
	this.x0 = 0; this.y0 = 0;
	this.blockX0 = 0; 
	this.rightX0 = 0; 
	this.leftX0 = 0;
	// Flags
	this.dual = true;
	this.moveState = false;
	this.moveIntervalState = false;
	this.debugMode = false;
	this.clearLimits = false;
	this.clearValues = false;
	// Handlers
	this.onMove = null;
	// Nodes
	this.leftBlock = null;
	this.rightBlock = null;
	this.leftBegun = null;
	this.rightBegun = null;
	this.centerBlock = null;
	this.itWasMove = false;
}

trackbar.hotSearch.prototype = {
// Const
	ERRORS : {
		1 : "������ ��� ������������� �������",
		2 : "����� ������� �� ������",
		3 : "������ ������� �� ������",
		4 : "����� ������� ������� �� �������",
		5 : "������ ������� ������� �� �������",
		6 : "�� ������ ������ ������� �������",
		7 : "�� ������� ������������ ���������� ��������",
		8 : "�� ������� �������-���������� ��������",
		9 : "�� ������� ������� �����"
	},
	LEFT_BLOCK_PREFIX : "leftBlock_",
	RIGHT_BLOCK_PREFIX : "rightBlock_",
	LEFT_BEGUN_PREFIX : "leftBegun_",
	RIGHT_BEGUN_PREFIX : "rightBegun_",
	CENTER_BLOCK_PREFIX : "centerBlock_",
// Methods
	// Default
	gebi : function(id) {
		return document.getElementById(id);
	},
	addHandler : function(object, event, handler, useCapture) {
		if (object.addEventListener) {
			object.addEventListener(event, handler, useCapture ? useCapture : false);
		} else if (object.attachEvent) {
			object.attachEvent('on' + event, handler);
		} else alert(this.errorArray[9]);
	},
	defPosition : function(event) { 
		var x = y = 0; 
		if (document.attachEvent != null) {
			x = window.event.clientX + document.documentElement.scrollLeft + document.body.scrollLeft; 
			y = window.event.clientY + document.documentElement.scrollTop + document.body.scrollTop; 
		} 
		if (!document.attachEvent && document.addEventListener) { // Gecko 
			x = event.clientX + window.scrollX; 
			y = event.clientY + window.scrollY; 
		} 
		return {x:x, y:y}; 
	},
	absPosition : function(obj) { 
		var x = y = 0; 
		while(obj) { 
			x += obj.offsetLeft; 
			y += obj.offsetTop; 
			obj = obj.offsetParent; 
		} 
		return {x:x, y:y}; 
	},
	// Common
	debug : function(keys) {
		if (!this.debugMode) return;
		var mes = "";
		for (var i = 0; i < keys.length; i++) mes += this.ERRORS[keys[i]] + " : ";
		mes = mes.substring(0, mes.length - 3);
		alert(mes);
	},
	init : function(hash) {
		try {
			this.dual = typeof hash.dual != "undefined" ? !!hash.dual : this.dual;
			this.leftLimit = hash.leftLimit || this.leftLimit;
			this.rightLimit = hash.rightLimit || this.rightLimit;
			this.width = hash.width || this.width;
			this.onMove = hash.onMove || this.onMove;
			this.clearLimits = hash.clearLimits || this.clearLimits;
			this.clearValues = hash.clearValues || this.clearValues;
			this.roundUp = hash.roundUp || this.roundUp;
			// HTML Write
			document.write('<table' + (this.width ? ' style="width:'+this.width+'px;"' : '') + 'class="trackbar" onSelectStart="return false;">\
				<tr>\
					<td class="l"><div id="leftBlock_' + this.id + '"><span></span><img id="leftBegun_' + this.id + '" ondragstart="return false;" src="/js/TrackBar/imgtrackbar/track_control.png" width="30" height="30" alt="" /></div></td>\
					<td class="c" id="centerBlock_' + this.id + '"></td>\
					<td class="r"><div id="rightBlock_' + this.id + '"><span></span><img id="rightBegun_' + this.id + '" ondragstart="return false;" src="/js/TrackBar/imgtrackbar/track_control.png" width="30" height="30" alt="" /></div></td>\
				</tr>\
			</table>');
			// Is all right?
			if (this.onMove == null) {
				this.debug([1,8]);
					return;
			}
			// ---
			this.leftBegun = this.gebi(this.LEFT_BEGUN_PREFIX + this.id);
			if (this.leftBegun == null) {
				this.debug([1,2]);
					return;
			}
			this.rightBegun = this.gebi(this.RIGHT_BEGUN_PREFIX + this.id);
			if (this.rightBegun == null) {
				this.debug([1,3]);
					return;
			}
			this.leftBlock = this.gebi(this.LEFT_BLOCK_PREFIX + this.id);
			if (this.leftBlock == null) {
				this.debug([1,4]);
					return;
			}
			this.rightBlock = this.gebi(this.RIGHT_BLOCK_PREFIX + this.id);
			if (this.rightBlock == null) {
				this.debug([1,5]);
					return;
			}
			this.centerBlock = this.gebi(this.CENTER_BLOCK_PREFIX + this.id);
			if (this.centerBlock == null) {
				this.debug([1,9]);
					return;
			}
			// ---
			if (!this.width) {
				this.debug([1,6]);
					return;
			}
			if (!this.rightLimit) {
				this.debug([1,7]);
					return;
			}
			// Set default
			this.valueWidth = this.width - 2 * this.widthRem;
			this.rightValue = hash.rightValue || this.rightLimit;
			this.leftValue = hash.leftValue || this.leftLimit;
			if (!this.dual) this.rightValue = this.leftValue;
			this.valueInterval = this.rightLimit - this.leftLimit;
			this.leftWidth = parseInt((this.leftValue - this.leftLimit) / this.valueInterval * this.valueWidth) + this.widthRem;
			this.rightWidth = this.valueWidth - parseInt((this.rightValue - this.leftLimit) / this.valueInterval * this.valueWidth) + this.widthRem;
			// Set limits
			if (!this.clearLimits) {
				this.leftBlock.firstChild.nextSibling.innerHTML = this.leftLimit;
				this.rightBlock.firstChild.nextSibling.innerHTML = this.rightLimit;
			}
			// Do it!
			this.setCurrentState();
			this.onMove();
			// Add handers
			var _this = this;
			this.addHandler (
				document,
				"mousemove",
				function(evt) {
					if (_this.moveState) _this.moveHandler(evt);
					if (_this.moveIntervalState) _this.moveIntervalHandler(evt);
				}
			);
			this.addHandler (
				document,
				"mouseup",
				function() {
					_this.moveState = false;
					_this.moveIntervalState = false;
				}
			);
			this.addHandler (
				this.leftBegun,
				"mousedown",
				function(evt) {
					evt = evt || window.event;
					if (evt.preventDefault) evt.preventDefault();
					evt.returnValue = false;
					_this.moveState = "left";
					_this.x0 = _this.defPosition(evt).x;
					_this.blockX0 = _this.leftWidth;
				}
			);
			this.addHandler (
				this.rightBegun,
				"mousedown",
				function(evt) {
					evt = evt || window.event;
					if (evt.preventDefault) evt.preventDefault();
					evt.returnValue = false;
					_this.moveState = "right";
					_this.x0 = _this.defPosition(evt).x;
					_this.blockX0 = _this.rightWidth;
				}
			);
			this.addHandler (
				this.centerBlock,
				"mousedown",
				function(evt) {
					evt = evt || window.event;
					if (evt.preventDefault) evt.preventDefault();
					evt.returnValue = false;
					_this.moveIntervalState = true;
					_this.intervalWidth = _this.width - _this.rightWidth - _this.leftWidth;
					_this.x0 = _this.defPosition(evt).x;
					_this.rightX0 = _this.rightWidth; 
					_this.leftX0 = _this.leftWidth;
				}
			),
			this.addHandler (
				this.centerBlock,
				"click",
				function(evt) {
					if (!_this.itWasMove) _this.clickMove(evt);
					_this.itWasMove = false;
				}
			);
			this.addHandler (
				this.leftBlock,
				"click",
				function(evt) {
					if (!_this.itWasMove)_this.clickMoveLeft(evt);
					_this.itWasMove = false;
				}
			);
			this.addHandler (
				this.rightBlock,
				"click",
				function(evt) {
					if (!_this.itWasMove)_this.clickMoveRight(evt);
					_this.itWasMove = false;
				}
			);
		} catch(e) {this.debug([1]);}
	},
	clickMoveRight : function(evt) {
		evt = evt || window.event;
		if (evt.preventDefault) evt.preventDefault();
		evt.returnValue = false;
		var x = this.defPosition(evt).x - this.absPosition(this.rightBlock).x;
		var w = this.rightBlock.offsetWidth;
		if (x <= 0 || w <= 0 || w < x || (w - x) < this.widthRem) return;
		this.rightWidth = (w - x);
		this.rightCounter();

		this.setCurrentState();
		this.onMove();
	},
	clickMoveLeft : function(evt) {
		evt = evt || window.event;
		if (evt.preventDefault) evt.preventDefault();
		evt.returnValue = false;
		var x = this.defPosition(evt).x - this.absPosition(this.leftBlock).x;
		var w = this.leftBlock.offsetWidth;
		if (x <= 0 || w <= 0 || w < x || x < this.widthRem) return;
		this.leftWidth = x;
		this.leftCounter();

		this.setCurrentState();
		this.onMove();
	},
	clickMove : function(evt) {
		evt = evt || window.event;
		if (evt.preventDefault) evt.preventDefault();
		evt.returnValue = false;
		var x = this.defPosition(evt).x - this.absPosition(this.centerBlock).x;
		var w = this.centerBlock.offsetWidth;
		if (x <= 0 || w <= 0 || w < x) return;
		if (x >= w / 2) {
			this.rightWidth += (w - x);
			this.rightCounter();
		} else {
			this.leftWidth += x;
			this.leftCounter();
		}
		this.setCurrentState();
		this.onMove();
	},
	setCurrentState : function() {
		this.leftBlock.style.width = this.leftWidth + "px";
		if (!this.clearValues) this.leftBlock.firstChild.innerHTML = (!this.dual && this.leftWidth > this.width / 2) ? "" : this.leftValue;
		if(!this.dual) {
			var x = this.leftBlock.firstChild.offsetWidth;
			this.leftBlock.firstChild.style.right = (this.widthRem * (1 - 2 * (this.leftWidth - this.widthRem) / this.width) - ((this.leftWidth - this.widthRem) * x / this.width)) + 'px';
		}
		this.rightBlock.style.width = this.rightWidth + "px";
		if (!this.clearValues) this.rightBlock.firstChild.innerHTML = (!this.dual && this.rightWidth >= this.width / 2) ? "" : this.rightValue;
		if(!this.dual) {
			var x = this.rightBlock.firstChild.offsetWidth;
			this.rightBlock.firstChild.style.left = (this.widthRem * (1 - 2 * (this.rightWidth - this.widthRem) / this.width) - ((this.rightWidth - this.widthRem) * x / this.width)) + 'px';
		}
	},
	/* OLD setCurrentState : function() {
		this.leftBlock.style.width = this.leftWidth + "px";
		this.leftBlock.firstChild.innerHTML = (!this.dual && this.leftWidth > this.width / 2) ? "" : this.leftValue;
		this.rightBlock.style.width = this.rightWidth + "px";
		this.rightBlock.firstChild.innerHTML = (!this.dual && this.rightWidth >= this.width / 2) ? "" : this.rightValue;
	},*/
	moveHandler : function(evt) {
		this.itWasMove = true;
		evt = evt || window.event;
		if (evt.preventDefault) evt.preventDefault();
		evt.returnValue = false;
		if (this.moveState == "left") {
			this.leftWidth = this.blockX0 + this.defPosition(evt).x - this.x0;
			this.leftCounter();
		}
		if (this.moveState == "right") {
			this.rightWidth = this.blockX0 + this.x0 - this.defPosition(evt).x;
			this.rightCounter();
		}
		this.setCurrentState();
		this.onMove();
	},
	moveIntervalHandler : function(evt) {
		this.itWasMove = true;
		evt = evt || window.event;
		if (evt.preventDefault) evt.preventDefault();
		evt.returnValue = false;
		var dX = this.defPosition(evt).x - this.x0;
		if (dX > 0) {
			this.rightWidth = this.rightX0 - dX > this.widthRem ? this.rightX0 - dX : this.widthRem;
			this.leftWidth = this.width - this.rightWidth - this.intervalWidth;
		} else {
			this.leftWidth = this.leftX0 + dX > this.widthRem ? this.leftX0 + dX : this.widthRem;
			this.rightWidth = this.width - this.leftWidth - this.intervalWidth;
		}
		this.rightCounter();
		this.leftCounter();
		this.setCurrentState();
		this.onMove();
	},
	rightCounter : function() {
		if (this.dual) {
			this.rightWidth = this.rightWidth > this.width - this.leftWidth ? this.width - this.leftWidth : this.rightWidth;
			this.rightWidth = this.rightWidth < this.widthRem ? this.widthRem : this.rightWidth;
			this.rightValue = this.leftLimit + this.valueInterval - parseInt((this.rightWidth - this.widthRem) / this.valueWidth * this.valueInterval);
			if (this.roundUp) this.rightValue = parseInt(this.rightValue / this.roundUp) * this.roundUp;
			if (this.leftWidth + this.rightWidth >= this.width) this.rightValue = this.leftValue;
		} else {
			this.rightWidth = this.rightWidth > (this.width - this.widthRem) ? this.width - this.widthRem : this.rightWidth;
			this.rightWidth = this.rightWidth < this.widthRem ? this.widthRem : this.rightWidth;
			this.leftWidth = this.width - this.rightWidth;
			this.rightValue = this.leftLimit + this.valueInterval - parseInt((this.rightWidth - this.widthRem) / this.valueWidth * this.valueInterval);
			if (this.roundUp) this.rightValue = parseInt(this.rightValue / this.roundUp) * this.roundUp;
			this.leftValue = this.rightValue;
		}
	},
	leftCounter : function() {
		if (this.dual) {
			this.leftWidth = this.leftWidth > this.width - this.rightWidth ? this.width - this.rightWidth : this.leftWidth;
			this.leftWidth = this.leftWidth < this.widthRem ? this.widthRem : this.leftWidth;
			this.leftValue = this.leftLimit + parseInt((this.leftWidth - this.widthRem) / this.valueWidth * this.valueInterval);
			if (this.roundUp) this.leftValue = parseInt(this.leftValue / this.roundUp) * this.roundUp;
			if (this.leftWidth + this.rightWidth >= this.width) this.leftValue = this.rightValue;
		} else {
			this.leftWidth = this.leftWidth > (this.width - this.widthRem) ? this.width - this.widthRem : this.leftWidth;
			this.leftWidth = this.leftWidth < this.widthRem ? this.widthRem : this.leftWidth;
			this.rightWidth = this.width - this.leftWidth;
			this.leftValue = this.leftLimit + parseInt((this.leftWidth - this.widthRem) / this.valueWidth * this.valueInterval);
			if (this.roundUp) this.leftValue = parseInt(this.leftValue / this.roundUp) * this.roundUp;
			this.rightValue = this.leftValue;
		}
	}
}