{"version":3,"file":"su-sticky.js","sources":["../../../../../../src/sheep/ui/su-sticky/su-sticky.vue","../../../../../../uniComponent:/RDovQXBwL1dvcmsvYWRkci9hY2RyLXVpL3NyYy9zaGVlcC91aS9zdS1zdGlja3kvc3Utc3RpY2t5LnZ1ZQ"],"sourcesContent":["<template>\r\n  <view class=\"u-sticky\" :id=\"elId\" :style=\"[style]\">\r\n    <view :style=\"[stickyContent]\" class=\"u-sticky__content\"><slot /></view>\r\n  </view>\r\n</template>\r\n\r\n<script>\r\nimport { deepMerge, addStyle, addUnit, sleep, guid, getPx, os, sys } from '@/sheep/helper'\r\nimport sheep from '@/sheep'\r\n/**\r\n * sticky 吸顶\r\n * @description 该组件与CSS中position: sticky属性实现的效果一致，当组件达到预设的到顶部距离时， 就会固定在指定位置，组件位置大于预设的顶部距离时，会重新按照正常的布局排列。\r\n * @property {String ｜ Number}\toffsetTop\t\t吸顶时与顶部的距离，单位px（默认 0 ）\r\n * @property {String ｜ Number}\tcustomNavHeight\t自定义导航栏的高度 （h5 默认44  其他默认 0 ）\r\n * @property {Boolean}\t\t\tstickyToTop\t\t是否开启吸顶功能 （默认 false ）\r\n * @property {String}\t\t\tbgColor\t\t\t组件背景颜色（默认 '#ffffff' ）\r\n * @property {String ｜ Number}\tzIndex\t\t\t吸顶时的z-index值\r\n * @property {String ｜ Number}\tindex\t\t\t自定义标识，用于区分是哪一个组件\r\n * @property {Object}\t\t\tcustomStyle\t\t组件的样式，对象形式\r\n * @event {Function} fixed\t\t组件吸顶时触发\r\n * @event {Function} unfixed\t组件取消吸顶时触发\r\n * @example <u-sticky offsetTop=\"200\"><view>塞下秋来风景异，衡阳雁去无留意</view></u-sticky>\r\n */\r\nexport default {\r\n  name: 'su-sticky',\r\n  props: {\r\n    // 吸顶容器到顶部某个距离的时候，进行吸顶，在H5平台，NavigationBar为44px\r\n    offsetTop: {\r\n      type: [String, Number],\r\n      default: 0,\r\n    },\r\n    // 自定义导航栏的高度\r\n    customNavHeight: {\r\n      type: [String, Number],\r\n      // #ifdef H5\r\n      // H5端的导航栏属于“自定义”导航栏的范畴，因为它是非原生的，与普通元素一致\r\n      default: 44,\r\n      // #endif\r\n      // #ifndef H5\r\n      default: sheep.$platform.navbar,\r\n      // #endif\r\n    },\r\n    // 是否开启吸顶功能\r\n    stickyToTop: {\r\n      type: Boolean,\r\n      default: false,\r\n    },\r\n    // 吸顶区域的背景颜色\r\n    bgColor: {\r\n      type: String,\r\n      default: 'transparent',\r\n    },\r\n    // z-index值\r\n    zIndex: {\r\n      type: [String, Number],\r\n      default: '',\r\n    },\r\n    // 列表中的索引值\r\n    index: {\r\n      type: [String, Number],\r\n      default: '',\r\n    },\r\n    customStyle: {\r\n      type: [Object, String],\r\n      default: () => ({}),\r\n    },\r\n  },\r\n  data() {\r\n    return {\r\n      cssSticky: false, // 是否使用css的sticky实现\r\n      stickyTop: 0, // 吸顶的top值，因为可能受自定义导航栏影响，最终的吸顶值非offsetTop值\r\n      elId: guid(),\r\n      left: 0, // js模式时，吸顶的内容因为处于postition: fixed模式，为了和原来保持一致的样式，需要记录并重新设置它的left，height，width属性\r\n      width: 'auto',\r\n      height: 'auto',\r\n      fixed: false, // js模式时，是否处于吸顶模式\r\n    }\r\n  },\r\n  computed: {\r\n    style() {\r\n      const style = {}\r\n      if (!this.stickyToTop) {\r\n        if (this.cssSticky) {\r\n          style.position = 'sticky'\r\n          style.zIndex = this.uZindex\r\n          style.top = addUnit(this.stickyTop)\r\n        } else {\r\n          style.height = this.fixed ? this.height + 'px' : 'auto'\r\n        }\r\n      } else {\r\n        // 无需吸顶时，设置会默认的relative(nvue)和非nvue的static静态模式即可\r\n        // #ifdef APP-NVUE\r\n        style.position = 'relative'\r\n        // #endif\r\n        // #ifndef APP-NVUE\r\n        style.position = 'static'\r\n        // #endif\r\n      }\r\n      style.backgroundColor = this.bgColor\r\n      return deepMerge(addStyle(this.customStyle), style)\r\n    },\r\n    // 吸顶内容的样式\r\n    stickyContent() {\r\n      const style = {}\r\n      if (!this.cssSticky) {\r\n        style.position = this.fixed ? 'fixed' : 'static'\r\n        style.top = this.stickyTop + 'px'\r\n        style.left = this.left + 'px'\r\n        style.width = this.width == 'auto' ? 'auto' : this.width + 'px'\r\n        style.zIndex = this.uZindex\r\n      }\r\n      return style\r\n    },\r\n    uZindex() {\r\n      return this.zIndex ? this.zIndex : 970\r\n    },\r\n  },\r\n  mounted() {\r\n    this.init()\r\n  },\r\n  methods: {\r\n    init() {\r\n      this.getStickyTop()\r\n      // 判断使用的模式\r\n      this.checkSupportCssSticky()\r\n      // 如果不支持css sticky，则使用js方案，此方案性能比不上css方案\r\n      if (!this.cssSticky) {\r\n        !this.stickyToTop && this.initObserveContent()\r\n      }\r\n    },\r\n    $uGetRect(selector, all) {\r\n      return new Promise((resolve) => {\r\n        uni\r\n          .createSelectorQuery()\r\n          .in(this)\r\n          [all ? 'selectAll' : 'select'](selector)\r\n          .boundingClientRect((rect) => {\r\n            if (all && Array.isArray(rect) && rect.length) {\r\n              resolve(rect)\r\n            }\r\n            if (!all && rect) {\r\n              resolve(rect)\r\n            }\r\n          })\r\n          .exec()\r\n      })\r\n    },\r\n    initObserveContent() {\r\n      // 获取吸顶内容的高度，用于在js吸顶模式时，给父元素一个填充高度，防止\"塌陷\"\r\n      this.$uGetRect('#' + this.elId).then((res) => {\r\n        this.height = res.height\r\n        this.left = res.left\r\n        this.width = res.width\r\n        this.$nextTick(() => {\r\n          this.observeContent()\r\n        })\r\n      })\r\n    },\r\n    observeContent() {\r\n      // 先断掉之前的观察\r\n      this.disconnectObserver('contentObserver')\r\n      const contentObserver = uni.createIntersectionObserver({\r\n        // 检测的区间范围\r\n        thresholds: [0.95, 0.98, 1],\r\n      })\r\n      // 到屏幕顶部的高度时触发\r\n      contentObserver.relativeToViewport({\r\n        top: -this.stickyTop,\r\n      })\r\n      // 绑定观察的元素\r\n      contentObserver.observe(`#${this.elId}`, (res) => {\r\n        this.setFixed(res.boundingClientRect.top)\r\n      })\r\n      this.contentObserver = contentObserver\r\n    },\r\n    setFixed(top) {\r\n      // 判断是否出于吸顶条件范围\r\n      const fixed = top <= this.stickyTop\r\n      this.fixed = fixed\r\n    },\r\n    disconnectObserver(observerName) {\r\n      // 断掉观察，释放资源\r\n      const observer = this[observerName]\r\n      observer && observer.disconnect()\r\n    },\r\n    getStickyTop() {\r\n      this.stickyTop = getPx(this.offsetTop) + getPx(this.customNavHeight)\r\n    },\r\n    async checkSupportCssSticky() {\r\n      // #ifdef H5\r\n      // H5，一般都是现代浏览器，是支持css sticky的，这里使用创建元素嗅探的形式判断\r\n      if (this.checkCssStickyForH5()) {\r\n        this.cssSticky = true\r\n      }\r\n      // #endif\r\n\r\n      // 如果安卓版本高于8.0，依然认为是支持css sticky的(因为安卓7在某些机型，可能不支持sticky)\r\n      if (os() === 'android' && Number(sys().system) > 8) {\r\n        this.cssSticky = true\r\n      }\r\n\r\n      // APP-Vue和微信平台，通过computedStyle判断是否支持css sticky\r\n      // #ifdef APP-VUE || MP-WEIXIN\r\n      this.cssSticky = await this.checkComputedStyle()\r\n      // #endif\r\n\r\n      // ios上，从ios6开始，都是支持css sticky的\r\n      if (os() === 'ios') {\r\n        this.cssSticky = true\r\n      }\r\n\r\n      // nvue，是支持css sticky的\r\n      // #ifdef APP-NVUE\r\n      this.cssSticky = true\r\n      // #endif\r\n    },\r\n    // 在APP和微信小程序上，通过uni.createSelectorQuery可以判断是否支持css sticky\r\n    checkComputedStyle() {\r\n      // 方法内进行判断，避免在其他平台生成无用代码\r\n      // #ifdef APP-VUE || MP-WEIXIN\r\n      return new Promise((resolve) => {\r\n        uni\r\n          .createSelectorQuery()\r\n          .in(this)\r\n          .select('.u-sticky')\r\n          .fields({\r\n            computedStyle: ['position'],\r\n          })\r\n          .exec((e) => {\r\n            resolve(e[0].position === 'sticky')\r\n          })\r\n      })\r\n      // #endif\r\n    },\r\n    // H5通过创建元素的形式嗅探是否支持css sticky\r\n    // 判断浏览器是否支持sticky属性\r\n    checkCssStickyForH5() {\r\n      // 方法内进行判断，避免在其他平台生成无用代码\r\n      // #ifdef H5\r\n      const vendorList = ['', '-webkit-', '-ms-', '-moz-', '-o-']\r\n      const vendorListLength = vendorList.length\r\n      const stickyElement = document.createElement('div')\r\n      for (let i = 0; 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