var isIE = (document.all) ? true : false; var $ = function (id) { return "string" == typeof id ? document.getElementById(id) : id; }; var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } } } var Extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } } var Bind = function(object, fun) { return function() { return fun.apply(object, arguments); } } var BindAsEventListener = function(object, fun) { return function(event) { return fun.call(object, (event || window.event)); } } var CurrentStyle = function(element){ return element.currentStyle || document.defaultView.getComputedStyle(element, null); } function addEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; } }; function removeEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.removeEventListener) { oTarget.removeEventListener(sEventType, fnHandler, false); } else if (oTarget.detachEvent) { oTarget.detachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = null; } }; // Drag Program var Drag = Class.create(); Drag.prototype = { // Target initialize: function(drag, options) { this.Drag = $(drag); // dragged target this._x = this._y = 0; // get the relative position of target this._marginLeft = this._marginTop = 0; // get margin // event target(for the use of remove event) this._fM = BindAsEventListener(this, this.Move); this._fS = Bind(this, this.Stop); this.SetOptions(options); this.Limit = !!this.options.Limit; this.mxLeft = parseInt(this.options.mxLeft); this.mxRight = parseInt(this.options.mxRight); this.mxTop = parseInt(this.options.mxTop); this.mxBottom = parseInt(this.options.mxBottom); this.LockX = !!this.options.LockX; this.LockY = !!this.options.LockY; this.Lock = !!this.options.Lock; this.onStart = this.options.onStart; this.onMove = this.options.onMove; this.onStop = this.options.onStop; this._Handle = $(this.options.Handle) || this.Drag; this._mxContainer = $(this.options.mxContainer) || null; this.Drag.style.position = "absolute"; // Transparent if(isIE && !!this.options.Transparent){ // Fill dragged target ****************************************************************************************** with(this._Handle.appendChild(document.createElement("div")).style){ width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)"; fontSize = 0; } } // revise range this.Repair(); addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start)); }, // Set Prototype SetOptions: function(options) { this.options = { Handle: "", Limit: false, mxLeft: 0, mxRight: 9999, mxTop: 0, mxBottom: 9999, mxContainer: "", LockX: false, LockY: false, Lock: false, Transparent: false, onStart: function(){}, onMove: function(){}, onStop: function(){} }; Extend(this.options, options || {}); }, // Drag Initial Start: function(oEvent) { if(this.Lock){ return; } this.Repair(); // get the relative position of target this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; // get margin this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0; this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0; // mousemove: move ; mouseup: stop addEventHandler(document, "mousemove", this._fM); addEventHandler(document, "mouseup", this._fS); if(isIE){ // Lose Capture addEventHandler(this._Handle, "losecapture", this._fS); // Set mouse Capture this._Handle.setCapture(); }else{ // Windows.blur addEventHandler(window, "blur", this._fS); // Stop Prototype event oEvent.preventDefault(); }; // append event this.onStart(); }, // Revise Range Repair: function() { if(this.Limit){ // revise error range parameter this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth); this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight); // if container exist, set "position: relative || absolute" to set it's position before getting "offset" !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || CurrentStyle(this._mxContainer).position == "absolute" || (this._mxContainer.style.position = "relative"); } }, // Drag Move: function(oEvent) { // Check if it's locked if(this.Lock){ this.Stop(); return; }; // clear UserChoice window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); // set moving parameter var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y; //set Range Limit if(this.Limit){ // set range parameter var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom; // if a container is planned, revise range parameter if(!!this._mxContainer){ mxLeft = Math.max(mxLeft, 0); mxTop = Math.max(mxTop, 0); mxRight = Math.min(mxRight, this._mxContainer.clientWidth); mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight); }; // revise moving parameter iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft); iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop); } // position set, revise margin if(!this.LockX){ this.Drag.style.left = iLeft - this._marginLeft + "px"; } if(!this.LockY){ this.Drag.style.top = iTop - this._marginTop + "px"; } // append event this.onMove(); }, // Stop dragging Stop: function() { // remove event removeEventHandler(document, "mousemove", this._fM); removeEventHandler(document, "mouseup", this._fS); if(isIE){ removeEventHandler(this._Handle, "losecapture", this._fS); this._Handle.releaseCapture(); }else{ removeEventHandler(window, "blur", this._fS); }; // append event this.onStop(); } };