<template>
 <div>
 <see-attachment :filesLists='files' :file='imgFile' v-if="showmask" @hideMask='showmask=false'></see-attachment>
 </div>
</template>
<script>
 import seeAttachment from "./seeAttachment.vue";
 export default {
 data() {
 return {
 showmask: false,
 imgFile: {}
 };
 },
 components: {
 seeAttachment
 },
 methods: {
 lookImg(f) {
 this.showmask = true;
 this.imgFile = f;
 },
 }
 };
</script>

<template>
 <div>
 <div class="proview_box" @click="hideMask">
 <div class="img_box">
 <img :src="imgPath" :width="width" :height="height" @click="stopEvent" id='img' />
 </div>
 </div>
 <div class="handleImg_box">
 <div @click="prevOne"><img src="../../../../static/img/prev.png" /></div>
 <div @click="rotate(0)"><img src="../../../../static/img/turn_left.png" /></div>
 <div @click="rotate(1)"><img src="../../../../static/img/turn_right.png" /></div>
 <div @click="nextOne"><img src="../../../../static/img/next.png" /></div>
 </div>
 </div>
</template>
<script>
 export default {
 name: 'seeAttachment',
 props: ['filesLists', 'file'],
 data: function() {
 return {
 imgPath: '',
 width: 0,
 height: 0,
 imgIndex: 0
 }
 },
 mounted() {
 this.getImgIndex();
 this.seeAttachment(this.imgIndex);
 },
 computed: {
 //去掉不是圖片的附件
 imgList() {
 const ARR = ["png", "PNG", "jpeg", "JPEG", "bmp", "BMP", "jpg", "JPG", "gif", "GIF"];
 let arrs = '';
 let suffix = '';
 let type = '';
 let newList = [];
 this.filesLists.forEach((item) => {
  arrs = item.name.split('.');
  suffix = arrs[arrs.length - 1];
  type = item.type ? item.type : item.raw ? item.raw.type : suffix;
  ARR.some(items => {
  if (type.includes(items)) {
  newList.push(item)
  }
  })
 })
 return newList;
 }
 },
 methods: {
 //通過(guò)父組件傳入的file獲取當(dāng)前查看的圖片index
 getImgIndex() {
 let that = this;
 that.imgList.forEach((item, index) => {
  if(that.file.id == item.id){
  that.imgIndex = index;
  }
 })
 },
 //隱藏查看圖片
 hideMask() {
 this.$emit('hideMask', false);
 },
 stopEvent(event) {
 //阻止冒泡事件
 //取消事件冒泡
 let e = event; //若省略此句，下面的e改為event，IE運(yùn)行可以，但是其他瀏覽器就不兼容
 if (e && e.stopPropagation) {
  e.stopPropagation();
 } else if (window.event) {
  window.event.cancelBubble = true;
 }
 },
 //上一張
 prevOne() {
 if (this.imgIndex == 0) {
  return false;
 }
 let img = document.getElementById('img')
 img.style.transform = 'rotate(0deg)';
 this.imgIndex = this.imgIndex - 1;
 this.seeAttachment(this.imgIndex);
 },
 //下一張
 nextOne() {
 let listLength = this.imgList.length - 1;
 if (this.imgIndex >= listLength) {
  return false;
 }
 let img = document.getElementById('img')
 img.style.transform = 'rotate(0deg)';
 this.imgIndex = this.imgIndex + 1;
 this.seeAttachment(this.imgIndex);
 },
 //右轉(zhuǎn)
 rotate(t) {
 let img = document.getElementById('img')
 var reg = /(rotate\([\-\+]?((\d+)(deg))\))/i;
 var wt = img.style['-webkit-transform'],
  wts = wt.match(reg);
 var $3 = RegExp.$3;
 var current = $3 ? parseInt($3) : 0;
 if (t == 0) {
  current = current == 0 ? 360 : current;
  current = (current - 90) % 360;
 } else {
  current = (current + 90) % 360;
 }
 img.style.transform = 'rotate(' + current + 'deg)';
 },
 seeAttachment(index = 0) {
 if (this.imgList.length == 0) {
  return false;
 }
 let that = this;
 let basePath = "http://" + (process.env.OSS_PATH.indexOf("test") == -1 ? "opyx-mtds-pro" :
  "opyx-mtds-test") + ".oss-cn-shenzhen.aliyuncs.com/";
 that.imgPath = basePath + that.imgList[index]['path'];
 let img_url = basePath + that.imgList[index]['path'];
 // 創(chuàng)建對(duì)象
 var img = new Image();
 // 改變圖片的src
 img.src = img_url;
 // 定時(shí)執(zhí)行獲取寬高
 var check = function() {
  // 只要任何一方大于0 
  // 表示已經(jīng)服務(wù)器已經(jīng)返回寬高 
  if (img.width > 0 || img.height > 0) {
  let wdt = document.body.offsetWidth;
  let hgt = document.body.offsetHeight;
  let ratio = 1;
  if (img.width > img.height && img.width > wdt * ratio) {
  img.height = img.height * wdt * ratio / img.width;
  img.width = wdt * ratio;
  console.log('寬大于高', img)
  } else if (img.height > img.width && img.height > hgt * ratio) {
  img.width = img.width * hgt * ratio / img.height;
  if (img.width > wdt) {
  img.width = wdt;
  }
  img.height = hgt * ratio;
  console.log('高大于寬', img)
  } else {
  img.height = img.height * wdt * ratio / img.width
  img.width = wdt * ratio
  console.log('正常', img)
  }
  that.width = img.width;
  that.height = img.height;
  clearInterval(set);
  }
 };
 var set = setInterval(check, 40);
 },
 }
 }
</script>
<style lang="scss" scoped>
 .handleImg_box {
 position: fixed;
 bottom: 0;
 left: 50%;
 z-index: 100;
 margin-left: -150px;
 width: 300px;
 padding: 1rem 0;
 display: flex;
 align-items: center;
 justify-content: space-around;
 }
 
 .handleImg_box div {
 font-size: 0;
 }
 
 .handleImg_box div img {
 width: 3rem;
 }
</style>