dccloud/uni-app-front-second-directory/node_modules/vant/es/nav-bar/index.js

// Utils
import { createNamespace } from '../utils';
import { BORDER_BOTTOM } from '../utils/constant'; // Components

import Icon from '../icon';

var _createNamespace = createNamespace('nav-bar'),
    createComponent = _createNamespace[0],
    bem = _createNamespace[1];

export default createComponent({
  props: {
    title: String,
    fixed: Boolean,
    zIndex: [Number, String],
    leftText: String,
    rightText: String,
    leftArrow: Boolean,
    placeholder: Boolean,
    safeAreaInsetTop: Boolean,
    border: {
      type: Boolean,
      default: true
    }
  },
  data: function data() {
    return {
      height: null
    };
  },
  mounted: function mounted() {
    if (this.placeholder && this.fixed) {
      this.height = this.$refs.navBar.getBoundingClientRect().height;
    }
  },
  methods: {
    genLeft: function genLeft() {
      var h = this.$createElement;
      var leftSlot = this.slots('left');

      if (leftSlot) {
        return leftSlot;
      }

      return [this.leftArrow && h(Icon, {
        "class": bem('arrow'),
        "attrs": {
          "name": "arrow-left"
        }
      }), this.leftText && h("span", {
        "class": bem('text')
      }, [this.leftText])];
    },
    genRight: function genRight() {
      var h = this.$createElement;
      var rightSlot = this.slots('right');

      if (rightSlot) {
        return rightSlot;
      }

      if (this.rightText) {
        return h("span", {
          "class": bem('text')
        }, [this.rightText]);
      }
    },
    genNavBar: function genNavBar() {
      var _ref;

      var h = this.$createElement;
      return h("div", {
        "ref": "navBar",
        "style": {
          zIndex: this.zIndex
        },
        "class": [bem({
          fixed: this.fixed,
          'safe-area-inset-top': this.safeAreaInsetTop
        }), (_ref = {}, _ref[BORDER_BOTTOM] = this.border, _ref)]
      }, [h("div", {
        "class": bem('content')
      }, [this.hasLeft() && h("div", {
        "class": bem('left'),
        "on": {
          "click": this.onClickLeft
        }
      }, [this.genLeft()]), h("div", {
        "class": [bem('title'), 'van-ellipsis']
      }, [this.slots('title') || this.title]), this.hasRight() && h("div", {
        "class": bem('right'),
        "on": {
          "click": this.onClickRight
        }
      }, [this.genRight()])])]);
    },
    hasLeft: function hasLeft() {
      return this.leftArrow || this.leftText || this.slots('left');
    },
    hasRight: function hasRight() {
      return this.rightText || this.slots('right');
    },
    onClickLeft: function onClickLeft(event) {
      this.$emit('click-left', event);
    },
    onClickRight: function onClickRight(event) {
      this.$emit('click-right', event);
    }
  },
  render: function render() {
    var h = arguments[0];

    if (this.placeholder && this.fixed) {
      return h("div", {
        "class": bem('placeholder'),
        "style": {
          height: this.height + "px"
        }
      }, [this.genNavBar()]);
    }

    return this.genNavBar();
  }
});