element-ui/lib/utils/vue-popper.js

'use strict';

exports.__esModule = true;

var _vue = require('vue');

var _vue2 = _interopRequireDefault(_vue);

var _popup = require('element-ui/lib/utils/popup');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var PopperJS = _vue2.default.prototype.$isServer ? function () {} : require('./popper');
var stop = function stop(e) {
  return e.stopPropagation();
};

/**
 * @param {HTMLElement} [reference=$refs.reference] - The reference element used to position the popper.
 * @param {HTMLElement} [popper=$refs.popper] - The HTML element used as popper, or a configuration used to generate the popper.
 * @param {String} [placement=button] - Placement of the popper accepted values: top(-start, -end), right(-start, -end), bottom(-start, -end), left(-start, -end)
 * @param {Number} [offset=0] - Amount of pixels the popper will be shifted (can be negative).
 * @param {Boolean} [visible=false] Visibility of the popup element.
 * @param {Boolean} [visible-arrow=false] Visibility of the arrow, no style.
 */
exports.default = {
  props: {
    transformOrigin: {
      type: [Boolean, String],
      default: true
    },
    placement: {
      type: String,
      default: 'bottom'
    },
    boundariesPadding: {
      type: Number,
      default: 5
    },
    reference: {},
    popper: {},
    offset: {
      default: 0
    },
    value: Boolean,
    visibleArrow: Boolean,
    arrowOffset: {
      type: Number,
      default: 35
    },
    appendToBody: {
      type: Boolean,
      default: true
    },
    popperOptions: {
      type: Object,
      default: function _default() {
        return {
          gpuAcceleration: false
        };
      }
    }
  },

  data: function data() {
    return {
      showPopper: false,
      currentPlacement: ''
    };
  },


  watch: {
    value: {
      immediate: true,
      handler: function handler(val) {
        this.showPopper = val;
        this.$emit('input', val);
      }
    },

    showPopper: function showPopper(val) {
      if (this.disabled) {
        return;
      }
      val ? this.updatePopper() : this.destroyPopper();
      this.$emit('input', val);
    }
  },

  methods: {
    createPopper: function createPopper() {
      var _this = this;

      if (this.$isServer) return;
      this.currentPlacement = this.currentPlacement || this.placement;
      if (!/^(top|bottom|left|right)(-start|-end)?$/g.test(this.currentPlacement)) {
        return;
      }

      var options = this.popperOptions;
      var popper = this.popperElm = this.popperElm || this.popper || this.$refs.popper;
      var reference = this.referenceElm = this.referenceElm || this.reference || this.$refs.reference;

      if (!reference && this.$slots.reference && this.$slots.reference[0]) {
        reference = this.referenceElm = this.$slots.reference[0].elm;
      }

      if (!popper || !reference) return;
      if (this.visibleArrow) this.appendArrow(popper);
      if (this.appendToBody) document.body.appendChild(this.popperElm);
      if (this.popperJS && this.popperJS.destroy) {
        this.popperJS.destroy();
      }

      options.placement = this.currentPlacement;
      options.offset = this.offset;
      options.arrowOffset = this.arrowOffset;
      this.popperJS = new PopperJS(reference, popper, options);
      this.popperJS.onCreate(function (_) {
        _this.$emit('created', _this);
        _this.resetTransformOrigin();
        _this.$nextTick(_this.updatePopper);
      });
      if (typeof options.onUpdate === 'function') {
        this.popperJS.onUpdate(options.onUpdate);
      }
      this.popperJS._popper.style.zIndex = _popup.PopupManager.nextZIndex();
      this.popperElm.addEventListener('click', stop);
    },
    updatePopper: function updatePopper() {
      var popperJS = this.popperJS;
      if (popperJS) {
        popperJS.update();
        if (popperJS._popper) {
          popperJS._popper.style.zIndex = _popup.PopupManager.nextZIndex();
        }
      } else {
        this.createPopper();
      }
    },
    doDestroy: function doDestroy(forceDestroy) {
      /* istanbul ignore if */
      if (!this.popperJS || this.showPopper && !forceDestroy) return;
      this.popperJS.destroy();
      this.popperJS = null;
    },
    destroyPopper: function destroyPopper() {
      if (this.popperJS) {
        this.resetTransformOrigin();
      }
    },
    resetTransformOrigin: function resetTransformOrigin() {
      if (!this.transformOrigin) return;
      var placementMap = {
        top: 'bottom',
        bottom: 'top',
        left: 'right',
        right: 'left'
      };
      var placement = this.popperJS._popper.getAttribute('x-placement').split('-')[0];
      var origin = placementMap[placement];
      this.popperJS._popper.style.transformOrigin = typeof this.transformOrigin === 'string' ? this.transformOrigin : ['top', 'bottom'].indexOf(placement) > -1 ? 'center ' + origin : origin + ' center';
    },
    appendArrow: function appendArrow(element) {
      var hash = void 0;
      if (this.appended) {
        return;
      }

      this.appended = true;

      for (var item in element.attributes) {
        if (/^_v-/.test(element.attributes[item].name)) {
          hash = element.attributes[item].name;
          break;
        }
      }

      var arrow = document.createElement('div');

      if (hash) {
        arrow.setAttribute(hash, '');
      }
      arrow.setAttribute('x-arrow', '');
      arrow.className = 'popper__arrow';
      element.appendChild(arrow);
    }
  },

  beforeDestroy: function beforeDestroy() {
    this.doDestroy(true);
    if (this.popperElm && this.popperElm.parentNode === document.body) {
      this.popperElm.removeEventListener('click', stop);
      document.body.removeChild(this.popperElm);
    }
  },


  // call destroy in keep-alive mode
  deactivated: function deactivated() {
    this.$options.beforeDestroy[0].call(this);
  }
};