/* Author: Lam@2009.10.21 (PHP+JS+CSS)
 * Email:  gzkakaxi@qq.com, liancanwei@gmail.com
 * Frame:  原生JavaScript
 * News:   新增“切换数量”, 自动获取
 */

function loadBanner(){
/////////////////////////////////////////////////////////// 函数初始化
var $E = function (id) {
	return 'string' == typeof id ? document.getElementById(id) : id;
};

var Extend = function(destination, source) {
	for (var property in source) {
		destination[property] = source[property];
	}
	return destination;
}

var CurrentStyle = function(element){
	return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}

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

var Tween = {
	Quart: {
		easeOut: function(t,b,c,d){
			return -c * ((t=t/d-1)*t*t*t - 1) + b;
		}
	},
	Back: {
		easeOut: function(t,b,c,d,s){
			if (s == undefined) s = 1.70158;
			return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
		}
	},
	Bounce: {
		easeOut: function(t,b,c,d){
			if ((t/=d) < (1/2.75)) {
				return c*(7.5625*t*t) + b;
			} else if (t < (2/2.75)) {
				return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
			} else if (t < (2.5/2.75)) {
				return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
			} else {
				return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
			}
		}
	}
}

//容器对象,滑动对象
var SlideTrans = function(container, slider, options) {
	this._slider = $E(slider);
	this._container = $E(container);//容器对象
	this._timer = null;//定时器
	this._count = Math.abs(this._container.getElementsByTagName('img').length);//切换数量
	this._target = 0;//目标值
	this._t = this._b = this._c = 0;//tween参数
	
	this.Index = 0;//当前索引
	
	this.SetOptions(options);
	
	this.Auto = !!this.options.Auto;
	this.Duration = Math.abs(this.options.Duration);
	this.Time = Math.abs(this.options.Time);
	this.Pause = Math.abs(this.options.Pause);
	this.Tween = this.options.Tween;
	this.onStart = this.options.onStart;
	this.onFinish = this.options.onFinish;
	
	var bVertical = !!this.options.Vertical;
	this._css = bVertical ? 'top' : 'left';//方向
	
	//样式设置
	var p = CurrentStyle(this._container).position;
	p == 'relative' || p == 'absolute' || (this._container.style.position = 'relative');
	this._container.style.overflow = 'hidden';
	this._slider.style.position = 'absolute';
	
	this.Change = this.options.Change ? this.options.Change :
		this._slider[bVertical ? 'offsetHeight' : 'offsetWidth'] / this._count;
};
SlideTrans.prototype = {
  //设置默认属性
  SetOptions: function(options) {
	this.options = {//默认值
		Vertical:	true,//是否垂直方向(方向不能改)
		Auto:		true,//是否自动
		Change:		0,//改变量
		Duration:	50,//滑动持续时间
		Time:		10,//滑动延时
		Pause:		3000,//停顿时间(Auto为true时有效)
		onStart:	function(){},//开始转换时执行
		onFinish:	function(){},//完成转换时执行
		Tween:		Tween.Quart.easeOut//tween算子
					//Tween.Bounce.easeOut;
					//Tween.Back.easeOut;
					//Tween.Quart.easeOut;
	};
	Extend(this.options, options || {});
  },
  //开始切换
  Run: function(index) {
	//修正index
	index == undefined && (index = this.Index);
	index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);
	//设置参数
	this._target = -Math.abs(this.Change) * (this.Index = index);
	this._t = 0;
	this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? 'top' : 'left']);
	this._c = this._target - this._b;
	
	this.onStart();
	this.Move();
  },
  //移动
  Move: function() {
	clearTimeout(this._timer);
	//未到达目标继续移动否则进行下一次滑动
	if (this._c && this._t < this.Duration) {
		this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
		this._timer = setTimeout(Bind(this, this.Move), this.Time);
	}else{
		this.MoveTo(this._target);
		this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
	}
  },
  //移动到
  MoveTo: function(i) {
	this._slider.style[this._css] = i + 'px';
  },
  //下一个
  Next: function() {
	this.Run(++this.Index);
  },
  //上一个
  Previous: function() {
	this.Run(--this.Index);
  },
  //停止
  Stop: function() {
	clearTimeout(this._timer); this.MoveTo(this._target);
  }
};


/////////////////////////////////////////////////////////// 执行函数
// new SlideTrans('banner_wrap', 'banner_content').Run();

/////////////////////////////////////////////////////////// 执行函数(加入导航)
var forEach = function(array, callback, thisObject){
	if(array.forEach){
		array.forEach(callback, thisObject);
	}else{
		for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); }
	}
}

//设置参数
var st = new SlideTrans('banner_wrap', 'banner_content', { Vertical: true });

//插入数字
var nums = [];

for (var i = 0, n = st._count - 1; i <= n;){
	nums[i] = $E('banner_num').appendChild(document.createElement('li'));
	nums[i].innerHTML = '<a href="javascript:void(0);" class="icon"><em>'+ ++i + '</em></a>';
}

//设置数字列表事件
forEach(nums, function(o, i){
	o.onmouseover = function(){
		o.className = 'on';
		st.Auto = false;
		st.Run(i);
	}
	o.onmouseout = function(){
		o.className = '';
		st.Auto = true;
		st.Run();
	}
});

//设置图片列表事件
var contents = $E('banner_content').getElementsByTagName('li');
forEach(contents, function(o, i){
	o.onmouseover = function(){
		st.Auto = false;
		st.Run(i);
	}
	o.onmouseout = function(){
		st.Auto = true;
		st.Run();
	}
});

//设置按钮样式
st.onStart = function(){
	forEach(nums, function(o, i){ o.className = st.Index == i ? 'on' : ''; })
}

//设置上一个和下一个按钮
$E('banner_pre').onclick = function(){ st.Previous(); }
$E('banner_next').onclick = function(){ st.Next(); }

st.Run();

}//End function;