<template>
  <view>
    <slot v-if="!nodes.length" />
    <!--#ifdef APP-PLUS-NVUE-->
    <web-view
      id="top"
      ref="web"
      :style="'margin-top:-2px;height:' + height + 'px'"
      @onPostMessage="_message"
    />
    <!--#endif-->
    <!--#ifndef APP-PLUS-NVUE-->
    <view
      id="top"
      :style="
        showAm +
        (selectable ? ';user-select:text;-webkit-user-select:text' : '')
      "
      :animation="scaleAm"
      @tap="_tap"
      @touchstart="_touchstart"
      @touchmove="_touchmove"
    >
      <!--#ifdef H5-->
      <div :id="'rtf' + uid"></div>
      <!--#endif-->
      <!--#ifndef H5-->
      <trees :nodes="nodes" :lazy-load="lazyLoad" />
      <image
        v-for="(item, index) in imgs"
        v-bind:key="index"
        :id="index"
        :src="item"
        hidden
        @load="_load"
      />
      <!--#endif-->
    </view>
    <!--#endif-->
  </view>
</template>
<script>
// #ifdef H5
import cfg from "./libs/config.js";
var rpx = uni.getSystemInfoSync().screenWidth / 750;
// #endif

// #ifdef APP-PLUS-NVUE
import cfg from "./libs/config.js";
var rpx = uni.getSystemInfoSync().screenWidth / 750;
var dom = weex.requireModule("dom");
// #endif

// #ifndef H5 || APP-PLUS-NVUE
import trees from "./libs/trees";
import Parser from "./libs/MpHtmlParser.js";
var cache = {},
  document;
function hash(str) {
  for (var i = str.length, val = 5381; i--; )
    val += (val << 5) + str.charCodeAt(i);
  return val;
}
// #endif

// #ifdef MP-WEIXIN || MP-TOUTIAO
var fs = uni.getFileSystemManager ? uni.getFileSystemManager() : null;
// #endif

export default {
  name: "parser",
  data() {
    return {
      // #ifdef H5
      uid: this._uid,
      // #endif
      // #ifdef APP-PLUS-NVUE
      height: 1,
      // #endif
      // #ifndef APP-PLUS-NVUE
      scaleAm: "",
      showAm: "",
      imgs: [],
      // #endif
      nodes: [],
    };
  },
  // #ifndef H5 || APP-PLUS-NVUE
  components: {
    trees,
  },
  // #endif
  props: {
    html: null,
    autopause: {
      type: Boolean,
      default: true,
    },
    autosetTitle: {
      type: Boolean,
      default: true,
    },
    // #ifndef H5 || APP-PLUS-NVUE
    compress: Number,
    useCache: Boolean,
    // #endif
    domain: String,
    // #ifndef MP-BAIDU || MP-ALIPAY || APP-PLUS
    gestureZoom: Boolean,
    // #endif
    lazyLoad: Boolean,
    selectable: Boolean,
    tagStyle: Object,
    showWithAnimation: Boolean,
    useAnchor: Boolean,
  },
  watch: {
    html(html) {
      this.setContent(html);
    },
  },
  mounted() {
    // 图片数组
    this.imgList = [];
    this.imgList.each = function (f) {
      for (var i = 0, len = this.length; i < len; i++)
        this.setItem(i, f(this[i], i, this));
    };
    this.imgList.setItem = function (i, src) {
      if (i == void 0 || !src) return;
      // #ifndef MP-ALIPAY || APP-PLUS
      // 去重
      if (src.indexOf("http") == 0 && this.includes(src)) {
        var newSrc = "";
        for (var j = 0, c; (c = src[j]); j++) {
          if (c == "/" && src[j - 1] != "/" && src[j + 1] != "/") break;
          newSrc += Math.random() > 0.5 ? c.toUpperCase() : c;
        }
        newSrc += src.substr(j);
        return (this[i] = newSrc);
      }
      // #endif
      this[i] = src;
      // 暂存 data src
      if (src.includes("data:image")) {
        var filePath,
          info = src.match(/data:image\/(\S+?);(\S+?),(.+)/);
        if (!info) return;
        // #ifdef MP-WEIXIN || MP-TOUTIAO
        filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`;
        fs &&
          fs.writeFile({
            filePath,
            data: info[3],
            encoding: info[2],
            success: () => (this[i] = filePath),
          });
        // #endif
        // #ifdef APP-PLUS
        filePath = `_doc/parser_tmp/${Date.now()}.${info[1]}`;
        var bitmap = new plus.nativeObj.Bitmap();
        bitmap.loadBase64Data(src, () => {
          bitmap.save(filePath, {}, () => {
            bitmap.clear();
            this[i] = filePath;
          });
        });
        // #endif
      }
    };
    // #ifdef H5
    this.document = document.getElementById("rtf" + this._uid);
    // #endif
    // #ifndef H5 || APP-PLUS-NVUE
    if (document) this.document = new document(this);
    // #endif
    // #ifdef APP-PLUS-NVUE
    this.document = this.$refs.web;
    this.$nextTick(() => {
      // #endif
      if (this.html) this.setContent(this.html);
      // #ifdef APP-PLUS-NVUE
    });
    // #endif
  },
  beforeDestroy() {
    // #ifdef H5
    if (this._observer) this._observer.disconnect();
    // #endif
    this.imgList.each((src) => {
      // #ifdef APP-PLUS
      if (src && src.includes("_doc")) {
        plus.io.resolveLocalFileSystemURL(src, (entry) => {
          entry.remove();
        });
      }
      // #endif
      // #ifdef MP-WEIXIN || MP-TOUTIAO
      if (src && src.includes(uni.env.USER_DATA_PATH))
        fs &&
          fs.unlink({
            filePath: src,
          });
      // #endif
    });
    clearInterval(this._timer);
  },
  methods: {
    // #ifdef H5 || APP-PLUS-NVUE
    _Dom2Str(nodes) {
      var str = "";
      for (var node of nodes) {
        if (node.type == "text") str += node.text;
        else {
          str += "<" + node.name;
          for (var attr in node.attrs || {})
            str += " " + attr + '="' + node.attrs[attr] + '"';
          if (!node.children || !node.children.length) str += ">";
          else
            str += ">" + this._Dom2Str(node.children) + "</" + node.name + ">";
        }
      }
      return str;
    },
    _handleHtml(html, append) {
      if (typeof html != "string") html = this._Dom2Str(html.nodes || html);
      if (!append) {
        // 处理 tag-style 和 userAgentStyles
        var style =
          "<style>@keyframes show{0%{opacity:0}100%{opacity:1}}img{max-width:100%}";
        for (var item in cfg.userAgentStyles)
          style += `${item}{${cfg.userAgentStyles[item]}}`;
        for (item in this.tagStyle) style += `${item}{${this.tagStyle[item]}}`;
        style += "</style>";
        html = style + html;
      }
      // 处理 rpx
      if (html.includes("rpx"))
        html = html.replace(
          /[0-9.]+\s*rpx/g,
          ($) => parseFloat($) * rpx + "px"
        );
      return html;
    },
    // #endif
    setContent(html, append) {
      // #ifdef APP-PLUS-NVUE
      if (!html) return (this.height = 1);
      if (append)
        this.$refs.web.evalJs(
          "var d=document.createElement('div');d.innerHTML='" +
            html.replace(/'/g, "\\'") +
            "';document.getElementById('parser').appendChild(d)"
        );
      else {
        html =
          '<meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1' +
          (this.selectable ? "" : ",user-scalable=no") +
          '"><base href="' +
          this.domain +
          '"><div id="parser">' +
          this._handleHtml(html) +
          '</div><script>"use strict";function post(n){if(window.__dcloud_weex_postMessage||window.__dcloud_weex_){var t={data:[n]};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(t):window.__dcloud_weex_.postMessage(JSON.stringify(t))}}function waitReady(){return new Promise(function(e){var t=document.getElementById("parser"),r=t.scrollHeight,n=setInterval(function(){r==t.scrollHeight?(clearInterval(n),e(r)):r=t.scrollHeight},500)})}' +
          (this.showWithAnimation
            ? 'document.body.style.animation="show .5s",'
            : "") +
          'setTimeout(function(){post({action:"load",text:document.body.innerText,height:document.getElementById("parser").scrollHeight+16})},50);</' +
          "script>";
        this.$refs.web.evalJs(
          "document.write('" + html.replace(/'/g, "\\'") + "');document.close()"
        );
      }
      this.$refs.web.evalJs(
        'var t=document.getElementsByTagName("title");t.length&&post({action:"getTitle",title:t[0].innerText});for(var a=document.getElementsByTagName("style"),i=0,b;b=a[i++];)b.innerHTML=b.innerHTML.replace(/body/g,"#parser");for(var e,o=document.getElementsByTagName("img"),n=[],i=0,r=0;e=o[i];i++)e.onerror=function(){post({action:"error",source:"img",target:this})},e.hasAttribute("ignore")||"A"==e.parentElement.nodeName||(e.i=r++,n.push(e.src),e.onclick=function(){post({action:"preview",img:{i:this.i,src:this.src}})});post({action:"getImgList",imgList:n});for(var a,s=document.getElementsByTagName("a"),c=0;a=s[c];c++)a.onclick=function(){var t,e=this.getAttribute("href");if("#"==e[0]){var r=document.getElementById(e.substr(1));r&&(t=r.offsetTop)}return post({action:"linkpress",href:e,offset:t}),!1};;for(var u,m=document.getElementsByTagName("video"),d=0;u=m[d];d++)u.style.maxWidth="100%",u.onerror=function(){post({action:"error",source:"video",target:this})}' +
          (this.autopause
            ? ",u.onplay=function(){for(var t,e=0;t=m[e];e++)t!=this&&t.pause()}"
            : "") +
          ';for(var g,l=document.getElementsByTagName("audio"),p=0;g=l[p];p++)g.onerror=function(){post({action:"error",source:"audio",target:this})};waitReady().then(function(e){post({action:"ready",height:e+16})})'
      );
      this.nodes = [1];
      // #endif
      // #ifdef H5
      if (!html) {
        if (this.rtf && !append) this.rtf.parentNode.removeChild(this.rtf);
        return;
      }
      var div = document.createElement("div");
      if (!append) {
        if (this.rtf) this.rtf.parentNode.removeChild(this.rtf);
        this.rtf = div;
      } else {
        if (!this.rtf) this.rtf = div;
        else this.rtf.appendChild(div);
      }
      div.innerHTML = this._handleHtml(html, append);
      for (
        var styles = this.rtf.getElementsByTagName("style"), i = 0, style;
        (style = styles[i++]);

      ) {
        style.innerHTML = style.innerHTML.replace(/body/g, "#rtf" + this._uid);
        style.setAttribute("scoped", "true");
      }
      // 懒加载
      if (!this._observer && this.lazyLoad && IntersectionObserver) {
        this._observer = new IntersectionObserver(
          (changes) => {
            for (let item, i = 0; (item = changes[i++]); ) {
              if (item.isIntersecting) {
                item.target.src = item.target.getAttribute("data-src");
                item.target.removeAttribute("data-src");
                this._observer.unobserve(item.target);
              }
            }
          },
          {
            rootMargin: "500px 0px 500px 0px",
          }
        );
      }
      var _ts = this;
      // 获取标题
      var title = this.rtf.getElementsByTagName("title");
      if (title.length && this.autosetTitle)
        uni.setNavigationBarTitle({
          title: title[0].innerText,
        });
      // 图片处理
      this.imgList.length = 0;
      var imgs = this.rtf.getElementsByTagName("img");
      for (let i = 0, j = 0, img; (img = imgs[i]); i++) {
        var src = img.getAttribute("src");
        if (this.domain && src) {
          if (src[0] == "/") {
            if (src[1] == "/")
              img.src =
                (this.domain.includes("://")
                  ? this.domain.split("://")[0]
                  : "") +
                ":" +
                src;
            else img.src = this.domain + src;
          } else if (!src.includes("://")) img.src = this.domain + "/" + src;
        }
        if (!img.hasAttribute("ignore") && img.parentElement.nodeName != "A") {
          img.i = j++;
          _ts.imgList.push(img.src || img.getAttribute("data-src"));
          img.onclick = function () {
            var preview = true;
            this.ignore = () => (preview = false);
            _ts.$emit("imgtap", this);
            if (preview) {
              uni.previewImage({
                current: this.i,
                urls: _ts.imgList,
              });
            }
          };
        }
        img.onerror = function () {
          _ts.$emit("error", {
            source: "img",
            target: this,
            context: {
              setSrc: (src) => (this.src = src),
            },
          });
        };
        if (_ts.lazyLoad && this._observer && img.src && img.i != 0) {
          img.setAttribute("data-src", img.src);
          img.removeAttribute("src");
          this._observer.observe(img);
        }
      }
      // 链接处理
      var links = this.rtf.getElementsByTagName("a");
      for (var link of links) {
        link.onclick = function () {
          var jump = true,
            href = this.getAttribute("href");
          _ts.$emit("linkpress", {
            href,
            ignore: () => (jump = false),
          });
          if (jump && href) {
            if (href[0] == "#") {
              if (_ts.useAnchor) {
                _ts.navigateTo({
                  id: href.substr(1),
                });
              }
            } else if (href.indexOf("http") == 0 || href.indexOf("//") == 0)
              return true;
            else {
              uni.navigateTo({
                url: href,
              });
            }
          }
          return false;
        };
      }
      // 视频处理
      var videos = this.rtf.getElementsByTagName("video");
      _ts.videoContexts = videos;
      for (let video, i = 0; (video = videos[i++]); ) {
        video.style.maxWidth = "100%";
        video.onerror = function () {
          _ts.$emit("error", {
            source: "video",
            target: this,
            context: this,
          });
        };
        video.onplay = function () {
          if (_ts.autopause)
            for (let item, i = 0; (item = _ts.videoContexts[i++]); )
              if (item != this) item.pause();
        };
      }
      // 音频处理
      var audios = this.rtf.getElementsByTagName("audios");
      for (var audio of audios)
        audio.onerror = function () {
          _ts.$emit("error", {
            source: "audio",
            target: this,
            context: this,
          });
        };
      if (!append) this.document.appendChild(this.rtf);
      this.$nextTick(() => {
        this.nodes = [1];
        this.$emit("load");
      });
      setTimeout(() => (this.showAm = ""), 500);
      // #endif
      // #ifndef H5 || APP-PLUS-NVUE
      var nodes;
      if (!html) return (this.nodes = []);
      else if (typeof html == "string") {
        let parser = new Parser(html, this);
        // 缓存读取
        if (this.useCache) {
          var hashVal = hash(html);
          if (cache[hashVal]) nodes = cache[hashVal];
          else {
            nodes = parser.parse();
            cache[hashVal] = nodes;
          }
        } else nodes = parser.parse();
        this.$emit("parse", nodes);
      } else if (Object.prototype.toString.call(html) == "[object Array]") {
        // 非本插件产生的 array 需要进行一些转换
        if (html.length && html[0].PoweredBy != "Parser") {
          let parser = new Parser(html, this);
          (function f(ns) {
            for (var i = 0, n; (n = ns[i]); i++) {
              if (n.type == "text") continue;
              n.attrs = n.attrs || {};
              for (var item in n.attrs)
                if (typeof n.attrs[item] != "string")
                  n.attrs[item] = n.attrs[item].toString();
              parser.matchAttr(n, parser);
              if (n.children && n.children.length) {
                parser.STACK.push(n);
                f(n.children);
                parser.popNode(parser.STACK.pop());
              } else n.children = void 0;
            }
          })(html);
        }
        nodes = html;
      } else if (typeof html == "object" && html.nodes) {
        nodes = html.nodes;
        console.warn("错误的 html 类型：object 类型已废弃");
      } else return console.warn("错误的 html 类型：" + typeof html);
      if (append) this.nodes = this.nodes.concat(nodes);
      else this.nodes = nodes;
      if (nodes.length && nodes[0].title && this.autosetTitle)
        uni.setNavigationBarTitle({
          title: nodes[0].title,
        });
      this.$nextTick(() => {
        this.imgList.length = 0;
        this.videoContexts = [];
        this.$emit("load");
      });
      // #endif
      // #ifndef APP-PLUS-NVUE
      var height;
      clearInterval(this._timer);
      this._timer = setInterval(() => {
        // #ifdef H5
        var res = [this.rtf.getBoundingClientRect()];
        // #endif
        // #ifndef H5
        // #ifdef APP-PLUS
        uni.createSelectorQuery().in(this);
        // #endif
        // #ifndef APP-PLUS
        this.createSelectorQuery()
          // #endif
          .select("#top")
          .boundingClientRect()
          .exec((res) => {
            // #endif
            this.width = res[0].width;
            if (res[0].height == height) {
              this.$emit("ready", res[0]);
              clearInterval(this._timer);
            }
            height = res[0].height;
            // #ifndef H5
          });
        // #endif
      }, 350);
      if (this.showWithAnimation && !append) this.showAm = "animation:show .5s";
      // #endif
    },
    getText(ns = this.nodes) {
      // #ifdef APP-PLUS-NVUE
      return this._text;
      // #endif
      // #ifdef H5
      return this.rtf.innerText;
      // #endif
      // #ifndef H5 || APP-PLUS-NVUE
      var txt = "";
      for (var i = 0, n; (n = ns[i++]); ) {
        if (n.type == "text")
          txt += n.text
            .replace(/&nbsp;/g, "\u00A0")
            .replace(/&lt;/g, "<")
            .replace(/&gt;/g, ">")
            .replace(/&amp;/g, "&");
        else if (n.type == "br") txt += "\n";
        else {
          // 块级标签前后加换行
          var block =
            n.name == "p" ||
            n.name == "div" ||
            n.name == "tr" ||
            n.name == "li" ||
            (n.name[0] == "h" && n.name[1] > "0" && n.name[1] < "7");
          if (block && txt && txt[txt.length - 1] != "\n") txt += "\n";
          if (n.children) txt += this.getText(n.children);
          if (block && txt[txt.length - 1] != "\n") txt += "\n";
          else if (n.name == "td" || n.name == "th") txt += "\t";
        }
      }
      return txt;
      // #endif
    },
    navigateTo(obj) {
      if (!this.useAnchor)
        return (
          obj.fail &&
          obj.fail({
            errMsg: "Anchor is disabled",
          })
        );
      // #ifdef APP-PLUS-NVUE
      if (!obj.id) dom.scrollToElement(this.$refs.web);
      else
        this.$refs.web.evalJs(
          'var pos=document.getElementById("' +
            obj.id +
            '");if(pos)post({action:"linkpress",href:"#",offset:pos.offsetTop+' +
            (obj.offset || 0) +
            "})"
        );
      return (
        obj.success &&
        obj.success({
          errMsg: "pageScrollTo:ok",
        })
      );
      // #endif
      // #ifdef H5
      if (!obj.id) {
        window.scrollTo(0, this.rtf.offsetTop);
        return (
          obj.success &&
          obj.success({
            errMsg: "pageScrollTo:ok",
          })
        );
      }
      var target = document.getElementById(obj.id);
      if (!target)
        return (
          obj.fail &&
          obj.fail({
            errMsg: "Label not found",
          })
        );
      obj.scrollTop = this.rtf.offsetTop + target.offsetTop + (obj.offset || 0);
      uni.pageScrollTo(obj);
      // #endif
      // #ifndef H5
      var Scroll = (selector, component) => {
        uni
          .createSelectorQuery()
          .in(component ? component : this)
          .select(selector)
          .boundingClientRect()
          .selectViewport()
          .scrollOffset()
          .exec((res) => {
            if (!res || !res[0])
              return (
                obj.fail &&
                obj.fail({
                  errMsg: "Label not found",
                })
              );
            obj.scrollTop = res[1].scrollTop + res[0].top + (obj.offset || 0);
            uni.pageScrollTo(obj);
          });
      };
      if (!obj.id) Scroll("#top");
      else {
        // #ifndef MP-BAIDU || MP-ALIPAY || APP-PLUS
        Scroll("#top >>> #" + obj.id + ", #top >>> ." + obj.id);
        // #endif
        // #ifdef MP-BAIDU || MP-ALIPAY || APP-PLUS
        for (var anchor of this.anchors)
          if (anchor.id == obj.id)
            Scroll("#" + obj.id + ", ." + obj.id, anchor.node);
        // #endif
      }
      // #endif
    },
    getVideoContext(id) {
      // #ifndef APP-PLUS-NVUE
      if (!id) return this.videoContexts;
      else
        for (var i = this.videoContexts.length; i--; )
          if (this.videoContexts[i].id == id) return this.videoContexts[i];
      // #endif
    },
    // 预加载
    preLoad(html, num) {
      // #ifdef H5 || APP-PLUS-NVUE
      if (html.constructor == Array) html = this._Dom2Str(html);
      var script =
        "var contain=document.createElement('div');contain.innerHTML='" +
        html.replace(/'/g, "\\'") +
        "';for(var imgs=contain.querySelectorAll('img'),i=imgs.length-1;i>=" +
        num +
        ";i--)imgs[i].removeAttribute('src');";
      // #endif
      // #ifdef APP-PLUS-NVUE
      this.$refs.web.evalJs(script);
      // #endif
      // #ifdef H5
      eval(script);
      // #endif
      // #ifndef H5 || APP-PLUS-NVUE
      if (typeof html == "string") {
        var id = hash(html);
        html = new Parser(html, this).parse();
        cache[id] = html;
      }
      var wait = [];
      (function f(ns) {
        for (var i = 0, n; (n = ns[i++]); ) {
          if (n.name == "img" && n.attrs.src && !wait.includes(n.attrs.src))
            wait.push(n.attrs.src);
          f(n.children || []);
        }
      })(html);
      if (num) wait = wait.slice(0, num);
      this._wait = (this._wait || []).concat(wait);
      if (!this.imgs) this.imgs = this._wait.splice(0, 15);
      else if (this.imgs.length < 15)
        this.imgs = this.imgs.concat(
          this._wait.splice(0, 15 - this.imgs.length)
        );
      // #endif
    },
    // #ifdef APP-PLUS-NVUE
    _message(e) {
      // 接收 web-view 消息
      var data = e.detail.data[0];
      if (data.action == "load") {
        this.$emit("load");
        this.height = data.height;
        this._text = data.text;
      } else if (data.action == "getTitle") {
        if (this.autosetTitle)
          uni.setNavigationBarTitle({
            title: data.title,
          });
      } else if (data.action == "getImgList") {
        this.imgList.length = 0;
        for (var i = data.imgList.length; i--; )
          this.imgList.setItem(i, data.imgList[i]);
      } else if (data.action == "preview") {
        var preview = true;
        data.img.ignore = () => (preview = false);
        this.$emit("imgtap", data.img);
        if (preview)
          uni.previewImage({
            current: data.img.i,
            urls: this.imgList,
          });
      } else if (data.action == "linkpress") {
        var jump = true,
          href = data.href;
        this.$emit("linkpress", {
          href,
          ignore: () => (jump = false),
        });
        if (jump && href) {
          if (href[0] == "#") {
            if (this.useAnchor)
              dom.scrollToElement(this.$refs.web, {
                offset: data.offset,
              });
          } else if (href.includes("://")) plus.runtime.openWeb(href);
          else
            uni.navigateTo({
              url: href,
            });
        }
      } else if (data.action == "error")
        this.$emit("error", {
          source: data.source,
          target: data.target,
        });
      else if (data.action == "ready") {
        this.height = data.height;
        this.$nextTick(() => {
          uni
            .createSelectorQuery()
            .in(this)
            .select("#top")
            .boundingClientRect()
            .exec((res) => {
              this.rect = res[0];
              this.$emit("ready", res[0]);
            });
        });
      }
    },
    // #endif
    // #ifndef APP-PLUS-NVUE
    // #ifndef H5
    _load(e) {
      if (this._wait.length)
        this.$set(this.imgs, e.target.id, this._wait.shift());
    },
    // #endif
    _tap(e) {
      // #ifndef MP-BAIDU || MP-ALIPAY || APP-PLUS
      if (this.gestureZoom && e.timeStamp - this._lastT < 300) {
        var initY = e.touches[0].pageY - e.currentTarget.offsetTop;
        if (this._zoom) {
          this._scaleAm.translateX(0).scale(1).step();
          uni.pageScrollTo({
            scrollTop: (initY + this._initY) / 2 - e.touches[0].clientY,
            duration: 400,
          });
        } else {
          var initX = e.touches[0].pageX - e.currentTarget.offsetLeft;
          this._initY = initY;
          this._scaleAm = uni.createAnimation({
            transformOrigin: `${initX}px ${this._initY}px 0`,
            timingFunction: "ease-in-out",
          });
          // #ifdef MP-TOUTIAO
          this._scaleAm.opacity(1);
          // #endif
          this._scaleAm.scale(2).step();
          this._tMax = initX / 2;
          this._tMin = (initX - this.width) / 2;
          this._tX = 0;
        }
        this._zoom = !this._zoom;
        this.scaleAm = this._scaleAm.export();
      }
      this._lastT = e.timeStamp;
      // #endif
    },
    _touchstart(e) {
      // #ifndef MP-BAIDU || MP-ALIPAY || APP-PLUS
      if (e.touches.length == 1) this._initX = this._lastX = e.touches[0].pageX;
      // #endif
    },
    _touchmove(e) {
      // #ifndef MP-BAIDU || MP-ALIPAY || APP-PLUS
      var diff = e.touches[0].pageX - this._lastX;
      if (this._zoom && e.touches.length == 1 && Math.abs(diff) > 20) {
        this._lastX = e.touches[0].pageX;
        if (
          (this._tX <= this._tMin && diff < 0) ||
          (this._tX >= this._tMax && diff > 0)
        )
          return;
        this._tX += diff * Math.abs(this._lastX - this._initX) * 0.05;
        if (this._tX < this._tMin) this._tX = this._tMin;
        if (this._tX > this._tMax) this._tX = this._tMax;
        this._scaleAm.translateX(this._tX).step();
        this.scaleAm = this._scaleAm.export();
      }
      // #endif
    },
    // #endif
  },
};
</script>

<style>
@keyframes show {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

/* #ifdef MP-WEIXIN */
:host {
  display: block;
  overflow: scroll;
  -webkit-overflow-scrolling: touch;
}

/* #endif */
</style>
