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/*
By sean at 2010.07, modified on 2010.09.10;
Example:
$(".productshow").xslider({//.productshow是要移动对象的外框;
unitdisplayed:3,//可视的单位个数 必需项;
movelength:1,//要移动的单位个数 必需项;
maxlength:null,//可视宽度或高度 默认查找要移动对象外层的宽或高度;
scrollobj:null,//要移动的对象 默认查找productshow下的ul;
unitlen:null,//移动的单位宽或高度 默认查找li的尺寸;
nowlength:null,//移动最长宽或高(要移动对象的宽度或高度) 默认由li个数乘以unitlen所得的积;
dir:"H",//水平移动还是垂直移动默认H为水平移动传入V或其他字符则表示垂直移动;
autoscroll:1000//自动移动间隔时间 默认null不自动移动;
});
*/
jQuery.extend(jQuery.easing,{
easeInSine: function (x, t, b, c, d) {
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
}
});
(function($){
$.fn.xslider=function(settings){
settings=$.extend({},$.fn.xslider.defaults,settings);
this.each(function(){
var scrollobj=settings.scrollobj || $(this).find("ul");
var maxlength=settings.maxlength || (settings.dir=="H" ? scrollobj.parent().width() : scrollobj.parent().height());//length of the wrapper visible;
var scrollunits=scrollobj.find("li");//units to move;
var unitlen=settings.unitlen || (settings.dir=="H" ? scrollunits.eq(0).outerWidth() : scrollunits.eq(0).outerHeight());
var unitdisplayed=settings.unitdisplayed;//units num displayed;
var nowlength=settings.nowlength || scrollunits.length*unitlen;//length of the scrollobj;
var offset=0;
var sn=0;
var movelength=unitlen*settings.movelength;
var moving=false;//moving now?;
var btnright=$(this).find("a.aright");
var btnleft=$(this).find("a.aleft");
if(settings.dir=="H"){
scrollobj.css("left","0px");
}else{
scrollobj.css("top","0px");
}
if(nowlength>maxlength){
btnleft.addClass("agrayleft");
btnright.removeClass("agrayright");
offset=nowlength-maxlength;
}else{
btnleft.addClass("agrayleft");
btnright.addClass("agrayright");
}
btnleft.click(function(){
if($(this).is("[class*='agrayleft']")){return false;}
if(!moving){
moving=true;
sn-=movelength;
if(sn>unitlen*unitdisplayed-maxlength){
jQuery.fn.xslider.scroll(scrollobj,-sn,settings.dir,function(){moving=false;});
}else{
jQuery.fn.xslider.scroll(scrollobj,0,settings.dir,function(){moving=false;});
sn=0;
$(this).addClass("agrayleft");
}
btnright.removeClass("agrayright");
}
return false;
});
btnright.click(function(){
if($(this).is("[class*='agrayright']")){return false;}
if(!moving){
moving=true;
sn+=movelength;
if(sn<offset-(unitlen*unitdisplayed-maxlength)){
jQuery.fn.xslider.scroll(scrollobj,-sn,settings.dir,function(){moving=false;});
}else{
jQuery.fn.xslider.scroll(scrollobj,-offset,settings.dir,function(){moving=false;});//滚动到最后一个位置;
sn=offset;
$(this).addClass("agrayright");
}
btnleft.removeClass("agrayleft");
}
return false;
});
if(settings.autoscroll){
jQuery.fn.xslider.autoscroll($(this),settings.autoscroll);
}
})
}
})(jQuery);
jQuery.fn.xslider.defaults = {
maxlength:0,
scrollobj:null,
unitlen:0,
nowlength:0,
dir:"H",
autoscroll:null
};
jQuery.fn.xslider.scroll=function(obj,w,dir,callback){
if(dir=="H"){
obj.animate({
left:w
},500,"easeInSine",callback);
}else{
obj.animate({
top:w
},500,"easeInSine",callback);
}
}
jQuery.fn.xslider.autoscroll=function(obj,time){
var vane="right";
function autoscrolling(){
if(vane=="right"){
if(!obj.find("a.agrayright").length){
obj.find("a.aright").trigger("click");
}else{
vane="left";
}
}
if(vane=="left"){
if(!obj.find("a.agrayleft").length){
obj.find("a.aleft").trigger("click");
}else{
vane="right";
}
}
}
var scrollTimmer=setInterval(autoscrolling,time);
obj.hover(function(){
clearInterval(scrollTimmer);
},function(){
scrollTimmer=setInterval(autoscrolling,time);
});
}