<template>
 <section class="page" v-if="option" 
  :style="{background: option.background,color: option.color||'#fff'}"  
  :class="{'page-before': option.index < currentPage,
    'page-after': option.index > currentPage,
    'page-current': option.index === currentPage}">
  <div :class="{'all-center': option.isCenter}">
   <slot></slot>
  </div>
 </section>
 <section class="page" v-else>页面正在渲染中。。。</section>
</template>

<template>
 <nav class="controller">
  <button v-if="option.arrowsType" class="prev-btn" :class="{moving:option.arrowsType === 'animate'}" @click="changePage(prevIndex)"></button>
  <ul v-if="option.navbar">
   <li v-for="index in pageNum" @click="changePage(index)" :class="{current:option.highlight && index === currentPage}" :key="'controller-'+index" :data-index="index" class="controller-item"></li>
  </ul>
  <button v-if="option.arrowsType" class="next-btn" :class="{moving:option.arrowsType === 'animate'}" @click="changePage(nextIndex)"></button>
 </nav>
</template>

<script>
export default {
 name: 'page-controller',
 props: {
 pageNum: Number,
 currentPage: Number,
 option: {
  type: Object,
  default: {
  arrowsType: 'animate',
  navbar: true,
  highlight: true,
  loop: true  //是否开启滚动循环
  }
 }
 },
 methods: {
 changePage (index) {
  this.$emit('changePage', index);
 }
 },
 computed: {
 nextIndex () {
  if (this.currentPage === this.pageNum) {
  if(this.option.loop){
   return 1
   }else{
   return this.pageNum
   }
  } else {
  return this.currentPage + 1;
  }
 },
 prevIndex () {
  if (this.currentPage === 1) {
  if(this.option.loop){
   return this.pageNum
   }else{
   return 1
   }
  } else {
  return this.currentPage - 1;
  }
 }
 },
 created () {
 if (this.option.navbar === undefined) {
  this.option.navbar = true;
 }
 },
 mounted () {
 let _this = this;
 let timer = null;
 let start = 0;
 // 滚轮处理
 function scrollHandler (direction) {
  // 防止重复触发滚动事件
  if (timer != null) {
  return;
  }
  if (direction === 'down') {
  _this.changePage(_this.nextIndex);
  } else {
  _this.changePage(_this.prevIndex);
  }
  timer = setTimeout(function() {
  clearTimeout(timer);
  timer = null;
  }, 300);
 }
 // if (Object.hasOwnProperty.call(window,'onmousewheel')) {
 if (Object.hasOwnProperty.call(window,'onmousewheel')) {
  // 监听滚轮事件
  window.addEventListener('mousewheel',function (event) { // IE/Opera/Chrome
  let direction = event.wheelDelta > 0 "_blank" href="https://www.jb51.net/Special/874.htm">Vue.js前端组件学习教程》，欢迎大家学习阅读。

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