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) {
 var args = Array.prototype.slice.call(arguments).slice(2);
 return function() {
  return fun.apply(object, args);
 }
}

var BindAsEventListener = function(object, fun) {
 return function(event) {
  return fun.call(object, Event(event));
 }
}

function Event(e){
 var oEvent = isIE ? window.event : e;
 if (isIE) {
  oEvent.pageX = oEvent.clientX + document.documentElement.scrollLeft;
  oEvent.pageY = oEvent.clientY + document.documentElement.scrollTop;
  oEvent.preventDefault = function () { this.returnValue = false; };
  oEvent.detail = oEvent.wheelDelta / (-40);
  oEvent.stopPropagation = function(){ this.cancelBubble = true; }; 
 }
 return oEvent;
}

var Each = function(list, fun){
 for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};

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;
    }
};


//滑动条程序
var Slider = Class.create();
Slider.prototype = {
  //容器对象，滑块
  initialize: function(container, bar, options) {
 
 this.Bar = $$(bar);
 this.Container = $$(container);
 this._timer = null;//自动滑移的定时器
 this._ondrag = false;//解决ie的click问题
 //是否最小值、最大值、中间值
 this._IsMin = this._IsMax = this._IsMid = false;
 //实例化一个拖放对象，并限定范围
 this._drag = new Drag(this.Bar, { Limit: true, mxContainer: this.Container,
  onStart: Bind(this, this.DragStart), onStop: Bind(this, this.DragStop), onMove: Bind(this, this.Move)
 });
 
 this.SetOptions(options);
 
 this.WheelSpeed = Math.max(0, this.options.WheelSpeed);
 this.KeySpeed = Math.max(0, this.options.KeySpeed);
 
 this.MinValue = this.options.MinValue;
 this.MaxValue = this.options.MaxValue;
 
 this.RunTime = Math.max(1, this.options.RunTime);
 this.RunStep = Math.max(1, this.options.RunStep);
 
 this.Ease = !!this.options.Ease;
 this.EaseStep = Math.max(1, this.options.EaseStep);
 
 this.onMin = this.options.onMin;
 this.onMax = this.options.onMax;
 this.onMid = this.options.onMid;
 
 this.onDragStart = this.options.onDragStart;
 this.onDragStop = this.options.onDragStop;
 
 this.onMove = this.options.onMove;
 
 this._horizontal = !!this.options.Horizontal;//一般不允许修改
 
 //锁定拖放方向
 this._drag[this._horizontal ? "LockY" : "LockX"] = true;
 
 //点击控制
 addEventHandler(this.Container, "click", BindAsEventListener(this, function(e){ this._ondrag || this.ClickCtrl(e);}));
 //取消冒泡，防止跟Container的click冲突
 addEventHandler(this.Bar, "click", BindAsEventListener(this, function(e){ e.stopPropagation(); }));
 
 //设置鼠标滚轮控制
 this.WheelBind(this.Container);
 //设置方向键控制
 this.KeyBind(this.Container);
 //修正获取焦点
 var oFocus = isIE ? (this.KeyBind(this.Bar), this.Bar) : this.Container;
 addEventHandler(this.Bar, "mousedown", function(){ oFocus.focus(); });
 //ie鼠标捕获和ff的取消默认动作都不能获得焦点，所以要手动获取
 //如果ie把focus设置到Container，那么在出现滚动条时ie的focus可能会导致自动滚屏
  },
  //设置默认属性
  SetOptions: function(options) {
 this.options = {//默认值
  MinValue: 0,//最小值
  MaxValue: 100,//最大值
  WheelSpeed: 5,//鼠标滚轮速度,越大越快(0则取消鼠标滚轮控制)
  KeySpeed:  50,//方向键滚动速度,越大越慢(0则取消方向键控制)
  Horizontal: true,//是否水平滑动
  RunTime: 20,//自动滑移的延时时间,越大越慢
  RunStep: 2,//自动滑移每次滑动的百分比
  Ease:  false,//是否缓动
  EaseStep: 5,//缓动等级,越大越慢
  onMin:  function(){},//最小值时执行
  onMax:  function(){},//最大值时执行
  onMid:  function(){},//中间值时执行
  onDragStart:function(){},//拖动开始时执行
  onDragStop: function(){},//拖动结束时执行
  onMove:  function(){}//滑动时执行
 };
 Extend(this.options, options || {});
  },
  //开始拖放滑动
  DragStart: function() {
this.Stop();
   this.onDragStart();
 this._ondrag = true;
  },
  //结束拖放滑动
  DragStop: function() {
   this.onDragStop();
 setTimeout(Bind(this, function(){ this._ondrag = false; }), 10);
  },
  //滑动中
  Move: function() {
   this.onMove();
 
 var percent = this.GetPercent();
 //最小值判断
 if(percent > 0){
  this._IsMin = false;
 }else{
  if(!this._IsMin){ this.onMin(); this._IsMin = true; }
 }
 //最大值判断
 if(percent < 1){
  this._IsMax = false;
 }else{
  if(!this._IsMax){ this.onMax(); this._IsMax = true; }
 }
 //中间值判断
 if(percent > 0 && percent < 1){
  if(!this._IsMid){ this.onMid(); this._IsMid = true; }
 }else{
  this._IsMid = false;
 }
  },
  //鼠标点击控制
  ClickCtrl: function(e) {
 var o = this.Container, iLeft = o.offsetLeft, iTop = o.offsetTop;
 while (o.offsetParent) { o = o.offsetParent; iLeft += o.offsetLeft; iTop += o.offsetTop; }
 //考虑有滚动条，要用pageX和pageY
 this.EasePos(e.pageX - iLeft - this.Bar.offsetWidth / 2, e.pageY - iTop - this.Bar.offsetHeight / 2);
  },
  //鼠标滚轮控制
  WheelCtrl: function(e) {
 var i = this.WheelSpeed * e.detail;
 this.SetPos(this.Bar.offsetLeft + i, this.Bar.offsetTop + i);
 //防止触发其他滚动条
 e.preventDefault();
  },
  //绑定鼠标滚轮
  WheelBind: function(o) {
   //鼠标滚轮控制
 addEventHandler(o, isIE ? "mousewheel" : "DOMMouseScroll", BindAsEventListener(this, this.WheelCtrl));
  },
  //方向键控制
  KeyCtrl: function(e) {
 if(this.KeySpeed){
  var iLeft = this.Bar.offsetLeft, iWidth = (this.Container.clientWidth - this.Bar.offsetWidth) / this.KeySpeed
   , iTop = this.Bar.offsetTop, iHeight = (this.Container.clientHeight - this.Bar.offsetHeight) / this.KeySpeed;
  //根据按键设置值
  switch (e.keyCode) {
   case 37 ://左
    iLeft -= iWidth; break;
   case 38 ://上
    iTop -= iHeight; break;
   case 39 ://右
    iLeft += iWidth; break;
   case 40 ://下
    iTop += iHeight; break;
   default :
    return;//不是方向按键返回
  }
  this.SetPos(iLeft, iTop);
  //防止触发其他滚动条
  e.preventDefault();
 }
  },
  //绑定方向键
  KeyBind: function(o) {
 addEventHandler(o, "keydown", BindAsEventListener(this, this.KeyCtrl));
 //设置tabIndex使设置对象能支持focus
 o.tabIndex = -1;
 //取消focus时出现的虚线框
 isIE || (o.style.outline = "none");
  },
  //获取当前值
  GetValue: function() {
 //根据最大最小值和滑动百分比取值
 return this.MinValue + this.GetPercent() * (this.MaxValue - this.MinValue);
  },
  //设置值位置
  SetValue: function(value) {
 //根据最大最小值和参数值设置滑块位置
 this.SetPercent((value- this.MinValue)/(this.MaxValue - this.MinValue));
  },
  //获取百分比
  GetPercent: function() {
 //根据滑动条滑块取百分比
 return this._horizontal ? this.Bar.offsetLeft / (this.Container.clientWidth - this.Bar.offsetWidth)
  : this.Bar.offsetTop / (this.Container.clientHeight - this.Bar.offsetHeight)
  },
  //设置百分比位置
  SetPercent: function(value) {
 //根据百分比设置滑块位置
 this.EasePos((this.Container.clientWidth - this.Bar.offsetWidth) * value, (this.Container.clientHeight - this.Bar.offsetHeight) * value);
  },
  //自动滑移(是否递增)
  Run: function(bIncrease) {
 this.Stop();
 //修正一下bIncrease
 bIncrease = !!bIncrease;
 //根据是否递增来设置值
 var percent = this.GetPercent() + (bIncrease ? 1 : -1) * this.RunStep / 100;
 this.SetPos((this.Container.clientWidth - this.Bar.offsetWidth) * percent, (this.Container.clientHeight - this.Bar.offsetHeight) * percent);
 //如果没有到极限值就继续滑移
 if(!(bIncrease ? this._IsMax : this._IsMin)){
  this._timer = setTimeout(Bind(this, this.Run, bIncrease), this.RunTime);
 }
  },
  //停止滑移
  Stop: function() {
 clearTimeout(this._timer);
  },
  //缓动滑移
  EasePos: function(iLeftT, iTopT) {
 this.Stop();
 //必须是整数，否则可能死循环
 iLeftT = Math.round(iLeftT); iTopT = Math.round(iTopT);
 //如果没有设置缓动
 if(!this.Ease){ this.SetPos(iLeftT, iTopT); return; }
 //获取缓动参数
 var iLeftN = this.Bar.offsetLeft, iLeftS = this.GetStep(iLeftT, iLeftN)
 , iTopN = this.Bar.offsetTop, iTopS = this.GetStep(iTopT, iTopN);
 //如果参数有值
 if(this._horizontal ? iLeftS : iTopS){
  //设置位置
  this.SetPos(iLeftN + iLeftS, iTopN + iTopS);
  //如果没有到极限值则继续缓动
  if(this._IsMid){ this._timer = setTimeout(Bind(this, this.EasePos, iLeftT, iTopT), this.RunTime); }
 }
  },
  //获取步长
  GetStep: function(iTarget, iNow) {
    var iStep = (iTarget - iNow) / this.EaseStep;
    if (iStep == 0) return 0;
    if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
    return iStep;
  },
  //设置滑块位置
  SetPos: function(iLeft, iTop) {
 this.Stop();
 this._drag.SetPos(iLeft, iTop);
  }
};

//拖放程序
var Drag = Class.create();
Drag.prototype = {
  //拖放对象
  initialize: function(drag, options) {
 this.Drag = $$(drag);//拖放对象
 this._x = this._y = 0;//记录鼠标相对拖放对象的位置
 this._marginLeft = this._marginTop = 0;//记录margin
 //事件对象(用于绑定移除事件)
 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";
 //透明
 if(isIE && !!this.options.Transparent){
  //ie6渲染bug
  this._Handle.style.overflow = "hidden";
  //填充拖放对象
  with(this._Handle.appendChild(document.createElement("div")).style){
   width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)";
  }
 }
 //修正范围
 this.Repair();
 addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));
  },
  //设置默认属性
  SetOptions: function(options) {
 this.options = {//默认值
  Handle:   "",//设置触发对象（不设置则使用拖放对象）
  Limit:   false,//是否设置范围限制(为true时下面参数有用,可以是负数)
  mxLeft:   0,//左边限制
  mxRight:  9999,//右边限制
  mxTop:   0,//上边限制
  mxBottom:  9999,//下边限制
  mxContainer: "",//指定限制在容器内
  LockX:   false,//是否锁定水平方向拖放
  LockY:   false,//是否锁定垂直方向拖放
  Lock:   false,//是否锁定
  Transparent: false,//是否透明
  onStart:  function(){},//开始移动时执行
  onMove:   function(){},//移动时执行
  onStop:   function(){}//结束移动时执行
 };
 Extend(this.options, options || {});
  },
  //准备拖动
  Start: function(oEvent) {
 if(this.Lock){ return; }
 this.Repair();
 //记录鼠标相对拖放对象的位置
 this._x = oEvent.clientX - this.Drag.offsetLeft;
 this._y = oEvent.clientY - this.Drag.offsetTop;
 //记录margin
 this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;
 this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0;
 //mousemove时移动 mouseup时停止
 addEventHandler(document, "mousemove", this._fM);
 addEventHandler(document, "mouseup", this._fS);
 if(isIE){
  //焦点丢失
  addEventHandler(this._Handle, "losecapture", this._fS);
  //设置鼠标捕获
  this._Handle.setCapture();
 }else{
  //焦点丢失
  addEventHandler(window, "blur", this._fS);
  //阻止默认动作
  oEvent.preventDefault();
 };
 //附加程序
 this.onStart();
  },
  //修正范围
  Repair: function() {
 if(this.Limit){
  //修正错误范围参数
  this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);
  this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);
  //如果有容器必须设置position为relative来相对定位，并在获取offset之前设置
  !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || CurrentStyle(this._mxContainer).position == "absolute" || (this._mxContainer.style.position = "relative");
 }
  },
  //拖动
  Move: function(oEvent) {
 //判断是否锁定
 if(this.Lock){ this.Stop(); return; };
 //清除选择
 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
 //设置移动参数
 this.SetPos(oEvent.clientX - this._x, oEvent.clientY - this._y);
  },
  //设置位置
  SetPos: function(iLeft, iTop) {
 //设置范围限制
 if(this.Limit){
  //设置范围参数
  var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom;
  //如果设置了容器，再修正范围参数
  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);
  };
  //修正移动参数
  iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);
  iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);
 }
 //设置位置，并修正margin
 if(!this.LockX){ this.Drag.style.left = iLeft - this._marginLeft + "px"; }
 if(!this.LockY){ this.Drag.style.top = iTop - this._marginTop + "px"; }
 //附加程序
 this.onMove();
  },
  //停止拖动
  Stop: function() {
 //移除事件
 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);
 };
 //附加程序
 this.onStop();
  }
};