RRDJ_APP/uniapp/unpackage/dist/dev/mp-toutiao/uview-ui/components/u-tabs/u-tabs.js

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component.options.__file = "uview-ui/components/u-tabs/u-tabs.vue"
/* harmony default export */ __webpack_exports__["default"] = (component.exports);

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/***/ 602:
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/*! exports provided: render, staticRenderFns, recyclableRender, components */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

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/***/ 603:
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/*! exports provided: render, staticRenderFns, recyclableRender, components */
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var components
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}
var recyclableRender = false
var staticRenderFns = []
render._withStripped = true



/***/ }),

/***/ 604:
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//
//
//
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//
//
//
//
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//
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//
/**
 * tabs 标签
 * @description 该组件，是一个tabs标签组件，在标签多的时候，可以配置为左右滑动，标签少的时候，可以禁止滑动。 该组件的一个特点是配置为滚动模式时，激活的tab会自动移动到组件的中间位置。
 * @tutorial https://www.uviewui.com/components/tabs.html
 * @property {Boolean} is-scroll tabs是否可以左右拖动（默认true）
 * @property {Array} list 标签数组，元素为对象，如[{name: '推荐'}]
 * @property {String Number} current 指定哪个tab为激活状态（默认0）
 * @property {String Number} height 导航栏的高度，单位rpx（默认80）
 * @property {String Number} font-size tab文字大小，单位rpx（默认30）
 * @property {String Number} duration 滑块移动一次所需的时间，单位秒（默认0.5）
 * @property {String} active-color 滑块和激活tab文字的颜色（默认#2979ff）
 * @property {String} inactive-color tabs文字颜色（默认#303133）
 * @property {String Number} bar-width 滑块宽度，单位rpx（默认40）
 * @property {Object} active-item-style 活动tabs item的样式，对象形式
 * @property {Object} bar-style 底部滑块的样式，对象形式
 * @property {Boolean} show-bar 是否显示底部的滑块（默认true）
 * @property {String Number} bar-height 滑块高度，单位rpx（默认6）
 * @property {String Number} item-width 标签的宽度（默认auto）
 * @property {String Number} gutter 单个tab标签的左右内边距之和，单位rpx（默认40）
 * @property {String} bg-color tabs导航栏的背景颜色（默认#ffffff）
 * @property {String} name 组件内部读取的list参数中的属性名（tab名称），见官网说明（默认name）
 * @property {String} count 组件内部读取的list参数中的属性名（badge徽标数），同name属性的使用，见官网说明（默认count）
 * @property {Array} offset 设置badge徽标数的位置偏移，格式为 [x, y]，也即设置的为top和right的值，单位rpx（默认[5, 20]）
 * @property {Boolean} bold 激活选项的字体是否加粗（默认true）
 * @event {Function} change 点击标签时触发
 * @example <u-tabs ref="tabs" :list="list" :is-scroll="false"></u-tabs>
 */
var _default2 = {
  name: "u-tabs",
  props: {
    // 导航菜单是否需要滚动，如只有2或者3个的时候，就不需要滚动了，此时使用flex平分tab的宽度
    isScroll: {
      type: Boolean,
      default: true
    },
    //需循环的标签列表
    list: {
      type: Array,
      default: function _default() {
        return [];
      }
    },
    // 当前活动tab的索引
    current: {
      type: [Number, String],
      default: 0
    },
    // 导航栏的高度和行高
    height: {
      type: [String, Number],
      default: 80
    },
    // 字体大小
    fontSize: {
      type: [String, Number],
      default: 30
    },
    // 过渡动画时长, 单位ms
    duration: {
      type: [String, Number],
      default: 0.5
    },
    // 选中项的主题颜色
    activeColor: {
      type: String,
      default: '#2979ff'
    },
    // 未选中项的颜色
    inactiveColor: {
      type: String,
      default: '#303133'
    },
    // 菜单底部移动的bar的宽度，单位rpx
    barWidth: {
      type: [String, Number],
      default: 40
    },
    // 移动bar的高度
    barHeight: {
      type: [String, Number],
      default: 6
    },
    // 单个tab的左或有内边距（左右相同）
    gutter: {
      type: [String, Number],
      default: 30
    },
    // 导航栏的背景颜色
    bgColor: {
      type: String,
      default: '#ffffff'
    },
    // 读取传入的数组对象的属性(tab名称)
    name: {
      type: String,
      default: 'name'
    },
    // 读取传入的数组对象的属性(徽标数)
    count: {
      type: String,
      default: 'count'
    },
    // 徽标数位置偏移
    offset: {
      type: Array,
      default: function _default() {
        return [5, 20];
      }
    },
    // 活动tab字体是否加粗
    bold: {
      type: Boolean,
      default: true
    },
    // 当前活动tab item的样式
    activeItemStyle: {
      type: Object,
      default: function _default() {
        return {};
      }
    },
    // 是否显示底部的滑块
    showBar: {
      type: Boolean,
      default: true
    },
    // 底部滑块的自定义样式
    barStyle: {
      type: Object,
      default: function _default() {
        return {};
      }
    },
    // 标签的宽度
    itemWidth: {
      type: [Number, String],
      default: 'auto'
    }
  },
  data: function data() {
    return {
      scrollLeft: 0,
      // 滚动scroll-view的左边滚动距离
      tabQueryInfo: [],
      // 存放对tab菜单查询后的节点信息
      componentWidth: 0,
      // 屏幕宽度，单位为px
      scrollBarLeft: 0,
      // 移动bar需要通过translateX()移动的距离
      parentLeft: 0,
      // 父元素(tabs组件)到屏幕左边的距离
      id: this.$u.guid(),
      // id值
      currentIndex: this.current,
      barFirstTimeMove: true // 滑块第一次移动时(页面刚生成时)，无需动画，否则给人怪异的感觉
    };
  },

  watch: {
    // 监听tab的变化，重新计算tab菜单的布局信息，因为实际使用中菜单可能是通过
    // 后台获取的（如新闻app顶部的菜单），获取返回需要一定时间，所以list变化时，重新获取布局信息
    list: function list(n, o) {
      var _this = this;
      // list变动时，重制内部索引，否则可能导致超出数组边界的情况
      if (n.length !== o.length) this.currentIndex = 0;
      // 用$nextTick等待视图更新完毕后再计算tab的局部信息，否则可能因为tab还没生成就获取，就会有问题
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        _this.init();
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    current: {
      immediate: true,
      handler: function handler(nVal, oVal) {
        var _this2 = this;
        // 视图更新后再执行移动操作
        this.$nextTick(function () {
          _this2.currentIndex = nVal;
          _this2.scrollByIndex();
        });
      }
    }
  },
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    // 移动bar的样式
    tabBarStyle: function tabBarStyle() {
      var style = {
        width: this.barWidth + 'rpx',
        transform: "translate(".concat(this.scrollBarLeft, "px, -100%)"),
        // 滑块在页面渲染后第一次滑动时，无需动画效果
        'transition-duration': "".concat(this.barFirstTimeMove ? 0 : this.duration, "s"),
        'background-color': this.activeColor,
        height: this.barHeight + 'rpx',
        opacity: this.barFirstTimeMove ? 0 : 1,
        // 设置一个很大的值，它会自动取能用的最大值，不用高度的一半，是因为高度可能是单数，会有小数出现
        'border-radius': "".concat(this.barHeight / 2, "px")
      };
      Object.assign(style, this.barStyle);
      return style;
    },
    // tab的样式
    tabItemStyle: function tabItemStyle() {
      var _this3 = this;
      return function (index) {
        var style = {
          height: _this3.height + 'rpx',
          'line-height': _this3.height + 'rpx',
          'font-size': _this3.fontSize + 'rpx',
          'transition-duration': "".concat(_this3.duration, "s"),
          padding: _this3.isScroll ? "0 ".concat(_this3.gutter, "rpx") : '',
          flex: _this3.isScroll ? 'auto' : '1',
          width: _this3.$u.addUnit(_this3.itemWidth)
        };
        // 字体加粗
        if (index == _this3.currentIndex && _this3.bold) style.fontWeight = 'bold';
        if (index == _this3.currentIndex) {
          style.color = _this3.activeColor;
          // 给选中的tab item添加外部自定义的样式
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        } else {
          style.color = _this3.inactiveColor;
        }
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      };
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                _context.next = 2;
                return _this4.$uGetRect('#' + _this4.id);
              case 2:
                tabRect = _context.sent;
                // tabs组件距离屏幕左边的宽度
                _this4.parentLeft = tabRect.left;
                // tabs组件的宽度
                _this4.componentWidth = tabRect.width;
                _this4.getTabRect();
              case 6:
              case "end":
                return _context.stop();
            }
          }
        }, _callee);
      }))();
    },
    // 点击某一个tab菜单
    clickTab: function clickTab(index) {
      // 点击当前活动tab，不触发事件
      if (index == this.currentIndex) return;
      // 发送事件给父组件
      this.$emit('change', index);
    },
    // 查询tab的布局信息
    getTabRect: function getTabRect() {
      // 创建节点查询
      var query = uni.createSelectorQuery().in(this);
      // 历遍所有tab，这里是执行了查询，最终使用exec()会一次性返回查询的数组结果
      for (var i = 0; i < this.list.length; i++) {
        // 只要size和rect两个参数
        query.select("#u-tab-item-".concat(i)).fields({
          size: true,
          rect: true
        });
      }
      // 执行查询，一次性获取多个结果
      query.exec(function (res) {
        this.tabQueryInfo = res;
        // 初始化滚动条和移动bar的位置
        this.scrollByIndex();
      }.bind(this));
    },
    // 滚动scroll-view，让活动的tab处于屏幕的中间位置
    scrollByIndex: function scrollByIndex() {
      var _this5 = this;
      // 当前活动tab的布局信息，有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
      var tabInfo = this.tabQueryInfo[this.currentIndex];
      if (!tabInfo) return;
      // 活动tab的宽度
      var tabWidth = tabInfo.width;
      // 活动item的左边到tabs组件左边的距离，用item的left减去tabs的left
      var offsetLeft = tabInfo.left - this.parentLeft;
      // 将活动的tabs-item移动到屏幕正中间，实际上是对scroll-view的移动
      var scrollLeft = offsetLeft - (this.componentWidth - tabWidth) / 2;
      this.scrollLeft = scrollLeft < 0 ? 0 : scrollLeft;
      // 当前活动item的中点点到左边的距离减去滑块宽度的一半，即可得到滑块所需的移动距离
      var left = tabInfo.left + tabInfo.width / 2 - this.parentLeft;
      // 计算当前活跃item到组件左边的距离
      this.scrollBarLeft = left - uni.upx2px(this.barWidth) / 2;
      // 第一次移动滑块的时候，barFirstTimeMove为true，放到延时中将其设置false
      // 延时是因为scrollBarLeft作用于computed计算时，需要一个过程需，否则导致出错
      if (this.barFirstTimeMove == true) {
        setTimeout(function () {
          _this5.barFirstTimeMove = false;
        }, 100);
      }
    }
  },
  mounted: function mounted() {
    this.init();
  }
};
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