/**
* @author lyj
* @Date 2016-02-04
* @Method 滑动方法 针对一个大容器内部的容器做滑动封装
* @param
* args args.swipeDom 大容器对象
* args.swipeType 滑动类型
* args.swipeDistance 缓冲距离
* 注意：子容器的高宽度是取的内容的高宽 所以padding的大小有影响
*/
if(!window.itlyj){
window.itlyj = {};
}
itlyj.iScroll = function(args){
/*调用的时候没有初始化的话就是初始化一次*/
if(!(this instanceof arguments.callee)) return new arguments.callee(args);
this.init(args);
};
itlyj.iScroll.prototype = {
constructor:itlyj.iScroll,
init:function(args){
/*局部变量来接受当前的this*/
var that = this;
/*如果传入的对象是一个Dom对象就把他看作是我们的大容器盒子*/
if(args.swipeDom && typeof args.swipeDom == 'object'){
that.parentDom = args.swipeDom;
}
/*如果不存在父容器就停止初始化*/
if(!that.parentDom) return false;
/*找到子容器*/
that.childDom = that.parentDom.children&&that.parentDom.children[0]?that.parentDom.children[0]:'';
/*如果不存在子容器就停止初始化*/
if(!that.childDom) return false;
/*初始化传入的参数*/
that.settings = {};
/*默认类型 默认的Y轴滑动 如果不是y的话就是以x轴开始滑动*/
that.settings.swipeType = args.swipeType?args.swipeType:'y';
/*默认的缓冲滑动距离*/
that.settings.swipeDistance = args.swipeDistance>=0?args.swipeDistance:150;
/*初始化滑动*/
that._scroll();
},
/*对外开放的设置定位的方法*/
setTranslate:function(translate){
this.currPostion = translate;
this._addTransition();
this._changeTranslate(this.currPostion);
},
_addTransition:function(){
this.childDom.style.transition = "all .2s ease";
this.childDom.style.webkitTransition = "all .2s ease";/*兼容 老版本webkit内核浏览器*/
},
_removeTransition:function(){
this.childDom.style.transition = "none";
this.childDom.style.webkitTransition = "none";/*兼容 老版本webkit内核浏览器*/
},
_changeTranslate:function(translate){
if(this.settings.swipeType == 'y'){
this.childDom.style.transform = "translateY("+translate+"px)";
this.childDom.style.webkitTransform = "translateY("+translate+"px)";
}else{
this.childDom.style.transform = "translateX("+translate+"px)";
this.childDom.style.webkitTransform = "translateX("+translate+"px)";
}
},
_scroll:function(){
/*局部变量来接受当前的this*/
var that = this;
/*滑动的类型*/
var type = that.settings.swipeType == 'y'?true:false;
/*父容器的高度或宽度*/
var parentHeight = type?that.parentDom.offsetHeight:that.parentDom.offsetWidth;
/*子容器的高度或宽度*/
var childHeight = type?that.childDom.offsetHeight:that.childDom.offsetWidth;
/*子容器没有父容器大的时候*/
if(childHeight < parentHeight){
if(type){
that.childDom.style.height = parentHeight + 'px';
childHeight = parentHeight;
}else{
that.childDom.style.width = parentHeight + 'px';
childHeight = parentHeight;
}
}
/*缓冲距离*/
var distance = that.settings.swipeDistance;
/*区间*/
/*左侧盒子定位的区间*/
that.maxPostion = 0;
that.minPostion = -(childHeight-parentHeight);
/*设置滑动的当前位置*/
that.currPostion = 0;
that.startPostion = 0;
that.endPostion = 0;
that.movePostion = 0;
/*1.滑动*/
that.childDom.addEventListener('touchstart',function(e){
/*初始的Y的坐标*/
that.startPostion = type?e.touches[0].clientY: e.touches[0].clientX;
},false);
that.childDom.addEventListener('touchmove',function(e){
e.preventDefault();
/*不停的做滑动的时候记录的endY的值*/
that.endPostion = type?e.touches[0].clientY: e.touches[0].clientX;
that.movePostion = that.startPostion - that.endPostion;/*计算了移动的距离*/
/*2.滑动区间*/
/*就是滑动区间*/
if((that.currPostion-that.movePostion)<(that.maxPostion+distance)
&&
(that.currPostion-that.movePostion)>(that.minPostion -distance)){
that._removeTransition();
that._changeTranslate(that.currPostion-that.movePostion);
}
},false);
window.addEventListener('touchend',function(e){
/*在限制滑动区间之后 重新计算当前定位*/
/*判断是否在我们的合理定位区间内*/
/*先向下滑动 */
if((that.currPostion-that.movePostion) > that.maxPostion){
that.currPostion = that.maxPostion;
that._addTransition();
that._changeTranslate(that.currPostion);
}
/*想上滑动的时候*/
else if((that.currPostion-that.movePostion) < that.minPostion){
that.currPostion = that.minPostion;
that._addTransition();
that._changeTranslate(that.currPostion);
}
/*正常的情况*/
else{
that.currPostion = that.currPostion-that.movePostion;
}
that._reset();
},false);
},
_reset:function(){
var that = this;
that.startPostion = 0;
that.endPostion = 0;
that.movePostion = 0;
}
};
