vue插件tab选项卡使用小结

<template>
 <tab :options="tabOpt" :state.sync="stateIndex"></tab>
</template>
<script type="text/babel">
 import tab from 'components/tab_touch';
 export default {
 data(){
  tabOpt:undefined,
  stateIndex:0
 },
 components:{
 "tab":tab
 },
 ready(){
  this.tabOpt={
  count: 2.3,
  pin:true,
  htmls:[
   "<span>白日登山</span>",
   "<span>望烽火</span>",
   "<span>黄昏饮马</span>",
   "<span>傍交河</span>",
   "<span>行人刁斗</span>",
   "<span>风沙暗</span>",
   "<span>公主琵琶</span>",
   "<span>幽怨多</span>",
   "<span>野营万里</span>",
   "<span>无城郭</span>",
   "<span>雨雪纷纷</span>",
   "<span>连大漠</span>"
  ],
  slideCallback:function (dex) {
 console.log(dex);
  },
  tabClassName:"tab",
  tabActiveClassName: "active"
  }
 }
 }
</script>

<template>
 <div class="fixWrap">
 <div class="component-tabsWrap" :id="tabsWrapID"
  v-touch:pan="onPan">
  <div class="component-tabs" :style="wrapStyle">
  <div class="component-tab" v-for="item in options.htmls" track-by="$index" :style="'width:'+tWidth+'px'"
   @click.stop="this.state=$index"
   :class="[options.tabClassName,$index==state?options.tabActiveClassName:'']">
   {{{item}}}
  </div>
  </div>
 </div>
 </div>
</template>
<style lang="sass" rel="stylesheet/sass">
 @import "tab.sass"
</style>
<script lang="babel" type="text/babel">
 var VueTouch = require ('vue-touch');
 Vue.use (VueTouch);
 import requestAnimFrame from "utils/requestAnimFrame"
 const sign = (num)=> {
 return num >= 0 ? 1 : -1
 }
 export default {
 props: ["options", "state"],
 data(){
  return {
  tabsWrapID: undefined,//外容器ID
  wrapWidth: "", //外容器宽度
  tWidth: 0, //每一个选项卡应该有多宽
  width: 0, //宽度。
  startTransX: 0,
  transX: 0, //元素样式偏移。
  cssX: 0 //动作中css实际完成的偏移。
  }
 },
 methods: {
  init(){
  this.wrapWidth = document.getElementById (this.tabsWrapID).offsetWidth;
  this.tWidth = this.wrapWidth / this.options.count;
  this.width = this.tWidth * this.options.htmls.length;
  setTimeout(function(){
   this.$el.style["height"]= this.$el.children[0].clientHeight+"px";
  }.bind(this),0)
  if (this.options.pin) {
   var elemRect = this.$el.getBoundingClientRect ();
   var windowOffset = this.getWindowOffset ();
   var winOffsetY = windowOffset.offsetY;
   this.elemOffsetY = elemRect.top + winOffsetY;
   document.addEventListener ('scroll', this.isTop);
  }
  },
  onPan(event){
  if (this.options.disPan) return;
  this.transX = event.deltaX + this.startTransX;
  this.cssX = this.transX;
  if (event.eventType == 4) {
   this.transX = -Math.round (-this.transX / this.tWidth) * this.tWidth; //整格滑动
   var start = null;
   if (this.transX > 0) {
   // 头部回弹
   this.transX = 0;
   var speed = 24;
   requestAnimFrame (step.bind (this));
   function step (timestamp) {
    this.cssX -= speed;
    if (this.cssX > this.transX) requestAnimFrame (step.bind (this));
    else this.startTransX = this.cssX = this.transX;
   };
   }
   else if (this.transX < this.wrapWidth - this.width) {
   // 尾部回弹
   this.transX = this.wrapWidth - this.width;
   var speed = 24;
   requestAnimFrame (step.bind (this));
   function step (timestamp) {
    this.cssX += speed;
    if (this.cssX < this.transX) requestAnimFrame (step.bind (this));
    else this.startTransX = this.cssX = this.transX;
   };
   }
   else {
   //整格落位
   let speed = 6;
   let _sign = sign (this.cssX - this.transX);
   if (_sign * (this.cssX - this.transX) > 1) requestAnimFrame (step.bind (this));
   else this.cssX = this.transX;
   function step (timestamp) {
    if (start === null) start = timestamp;
    let progress = timestamp - start;
    if (progress < 3000) speed *= 1 - progress / 3000;
    this.cssX -= _sign * speed;
    if (_sign * (this.cssX - this.transX) > 1) requestAnimFrame (step.bind (this));
    else this.cssX = this.transX;
   };
   }
   this.startTransX = this.transX; //滑动结束设置下次滑动起始值。
  }

  },
  slideTo(dex){
  this.state = dex;
  let speed = 10;
  // 开头几个
  if (dex + 1 <= this.options.count) {
   this.transX = 0; // 设置应到位置。
   if (this.startTransX < this.transX) {
   let _sign = sign (this.transX - this.startTransX);
   this.cssX = this.transX - _sign * this.tWidth;
   requestAnimFrame (step.bind (this));
   function step () {
    this.cssX += _sign * speed;
    if (_sign * (this.cssX - this.transX) < 0) requestAnimFrame (step.bind (this));
    else {
    this.cssX = this.startTransX = this.transX;
    if (this.options.slideCallback) this.options.slideCallback (dex);
    }
    ;
   };
   }
   //无需动画
   else {
   this.cssX = this.startTransX = this.transX;
   if (this.options.slideCallback) this.options.slideCallback (dex);
   }
  }
  // 结尾几个
  else if (this.options.htmls.length - dex <= this.options.count) {
   this.transX = this.wrapWidth - this.width;// 设置应到位置。
   if (this.startTransX > this.transX) {
   let _sign = sign (this.transX - this.startTransX);
   this.cssX = this.transX - _sign * this.tWidth;
   requestAnimFrame (step.bind (this));
   function step () {
    this.cssX += _sign * speed;
    if (_sign * (this.cssX - this.transX) < 0) requestAnimFrame (step.bind (this));
    else {
    this.cssX = this.startTransX = this.transX;
    if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
    }

   };
   }
   else {
   this.cssX = this.startTransX = this.transX; //无需动画
   if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
   }
  }
  //中
  else {
   this.transX = -this.tWidth * dex;// 设置应到位置。
   let _sign = sign (this.transX - this.startTransX);
   if (this.tWidth * (dex + 0.5 * (1 - _sign)) + this.startTransX >= 0 && this.tWidth * (dex + 0.5 * (1 - _sign)) + this.startTransX <= this.wrapWidth) {
   //无需动画
   this.cssX = this.transX = this.startTransX;
   if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
   }
   else {
   //需要动画
   this.cssX = this.transX - _sign * this.tWidth;
   requestAnimFrame (step.bind (this));
   function step () {
    this.cssX += _sign * speed;
    if (_sign * (this.cssX - this.transX) < 0) requestAnimFrame (step.bind (this));
    else {
    this.cssX = this.startTransX = this.transX;
    if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
    }
   };
   }
  }
  },
  isTop(){
  var windowOffset = this.getWindowOffset (),
   winOffsetY = windowOffset.offsetY,
   isTop;
  isTop = this.elemOffsetY <= winOffsetY;
  if (isTop) {
   this.$el.children[0].style['position'] = 'fixed';
   this.$el.children[0].style['top'] = '0';
   this.$el.children[0].style['left'] = '0';
  }
  else {
   this.$el.children[0].style['position']='relative';
  }
  return isTop;
  },
  getWindowOffset(){
  var t;
  var win = window;
  var pageXOffset = (typeof win.pageXOffset == 'number') ? win.pageXOffset : (((t = doc.documentElement) || (t = body.parentNode)) && typeof t.ScrollLeft == 'number' ? t : body).ScrollLeft;
  var pageYOffset = (typeof win.pageYOffset == 'number') ? win.pageYOffset : (((t = doc.documentElement) || (t = body.parentNode)) && typeof t.ScrollTop == 'number' ? t : body).ScrollTop;
  return {
   offsetX: pageXOffset,
   offsetY: pageYOffset
  };
  },
 },
 watch: {
  options(){
  this.tabsWrapID = parseInt (Math.random () * 1e10);
  setTimeout (this.init.bind (this), 10);
  },
  state(val){
  this.slideTo(val)
  }
 },
 computed: {
  wrapStyle(){
  var _str = "";
  if (this.width) _str += `width:${this.width}px;`;//宽度
  _str += `-webkit-transform:translateX(${this.cssX}px);` //位移。
  _str += `transform:translateX(${this.cssX}px);` //位移。
  return _str
  }
 }
 }
</script>
<style lang="sass" rel="stylesheet/sass" type="sass">
.fixWrap
 z-index: 999
 position: relative
.component-tabsWrap
 width: 100%
 overflow: hidden
 min-height: .1rem
 position: relative
 background: #fff
 .component-tabs
 height: 100%
 display: table
 .component-tab
 display: table-cell
 box-sizing: border-box
 text-align: center
 vertical-align: middle
</style>