Edit D:\chineseall_products\bak\digitalLib6\js\drag.js

??//http://boring.youngpup.net/2001/domdrag/

/**
 * Base class of Drag
 * ????? Element ??????????? event ???????????????????????????netvibes ??????????????????????????? dindin ?????????????????ttp://www.jroller.com/page/dindin/?anchor=pro_javascript_12
 * @example:
 * Drag.init( header_element, element );
 */
var Drag = {
	// ?????lement???????????????????lement
	obj: null , 
	/**
	 * @param: elementHeader	used to drag..
	 * @param: element			used to follow..
	 */
	init: function(elementHeader, element) {
		// ?? start ????? onmousedown ?????????????? start
		elementHeader.onmousedown = Drag.start;
		// ?? element ??? header ?? obj ???????? header ???????????
		elementHeader.obj = element;
		// ???????????????????? position = absolute ????????????????????????? onDrag ????? parse ?????
		if(isNaN(parseInt(element.style.left))) {
			element.style.left = "0px";
		}
		if(isNaN(parseInt(element.style.top))) {
			element.style.top = "0px";
		}
		// ????? Function????????????????? Drag.init ????????????????????
		element.onDragStart = new Function();
		element.onDragEnd = new Function();
		element.onDrag = new Function();
	},
	// ?????????????????????????? event ??
	start: function(event) {
		var element = Drag.obj = this.obj;
		// ???????????? event ???????????
		event = Drag.fixE(event);
		// ??????????????
		if(event.which != 1){
			// ??????????????
			return true ;
		}
		// ?????????????????????????????
		element.onDragStart();
		// ?????????
		element.lastMouseX = event.clientX;
		element.lastMouseY = event.clientY;
		// ??????
		document.onmouseup = Drag.end;
		document.onmousemove = Drag.drag;
		return false ;
	}, 
	// Element????????????
	drag: function(event) {
		event = Drag.fixE(event);
		if(event.which == 0 ) {
		 	return Drag.end();
		}
		// ?????????Element
		var element = Drag.obj;
		// ??????
		var _clientX = event.clientY;
		var _clientY = event.clientX;
		// ??????????????????
		if(element.lastMouseX == _clientY && element.lastMouseY == _clientX) {
			return	false ;
		}
		// ??? Element ?????
		var _lastX = parseInt(element.style.top);
		var _lastY = parseInt(element.style.left);
		// ??????
		var newX, newY;
		// ??????????????????+???????????
		newX = _lastY + _clientY - element.lastMouseX;
		newY = _lastX + _clientX - element.lastMouseY;
		// ??? element ????????
		element.style.left = newX + "px";
		element.style.top = newY + "px";
		// ??? element ????????????????????
		element.lastMouseX = _clientY;
		element.lastMouseY = _clientX;
		// ???????????????????? Drag ??????
		element.onDrag(newX, newY);
		return false;
	},
	// Element ????????????????????
	end: function(event) {
		event = Drag.fixE(event);
		// ?????????
		document.onmousemove = null;
		document.onmouseup = null;
		// ?????? onDragEnd ??????????? obj
		var _onDragEndFuc = Drag.obj.onDragEnd();
		// ????????bj ???
		Drag.obj = null ;
		return _onDragEndFuc;
	},
	// ???????????? event ???????????
	fixE: function(ig_) {
		if( typeof ig_ == "undefined" ) {
			ig_ = window.event;
		}
		if( typeof ig_.layerX == "undefined" ) {
			ig_.layerX = ig_.offsetX;
		}
		if( typeof ig_.layerY == "undefined" ) {
			ig_.layerY = ig_.offsetY;
		}
		if( typeof ig_.which == "undefined" ) {
			ig_.which = ig_.button;
		}
		return ig_;
	}
};

/**
 * four function for Drag..
 */
function start_Drag(){
	var position = Position.positionedOffset(this.elm);
	var offLeft = position[0];
	var offTop = position[1];
	var offW = this.elm.offsetWidth;
	this.elm.style.width = offW + "px";
	this.elm.style.position = "absolute";
	this.elm.style.zIndex = 100;
	this.elm.style.left = offLeft + "px";
	this.elm.style.top = offTop + "px";
	this.isDragging = false;
	return false 
}

function when_Drag(clientX , clientY){
}

function end_Drag(){
	if(this._afterDrag()){
	}
	return true;
}

function after_Drag(){
}

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