bootstrap-vue/esm/directives/hover/hover.js

BootstrapVue, with more than 85 custom components, over 45 plugins, several custom directives, and over 300 icons, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated W

// v-b-hover directive
import { isBrowser } from '../../utils/env';
import { EVENT_OPTIONS_NO_CAPTURE, eventOnOff } from '../../utils/events';
import { isFunction } from '../../utils/inspect'; // --- Constants ---

var PROP = '__BV_hover_handler__';
var MOUSEENTER = 'mouseenter';
var MOUSELEAVE = 'mouseleave'; // --- Utility methods ---

var createListener = function createListener(handler) {
  var listener = function listener(evt) {
    handler(evt.type === MOUSEENTER, evt);
  };

  listener.fn = handler;
  return listener;
};

var updateListeners = function updateListeners(on, el, listener) {
  eventOnOff(on, el, MOUSEENTER, listener, EVENT_OPTIONS_NO_CAPTURE);
  eventOnOff(on, el, MOUSELEAVE, listener, EVENT_OPTIONS_NO_CAPTURE);
}; // --- Directive bind/unbind/update handler ---


var directive = function directive(el, _ref) {
  var _ref$value = _ref.value,
      handler = _ref$value === void 0 ? null : _ref$value;

  if (isBrowser) {
    var listener = el[PROP];
    var hasListener = isFunction(listener);
    var handlerChanged = !(hasListener && listener.fn === handler);

    if (hasListener && handlerChanged) {
      updateListeners(false, el, listener);
      delete el[PROP];
    }

    if (isFunction(handler) && handlerChanged) {
      el[PROP] = createListener(handler);
      updateListeners(true, el, el[PROP]);
    }
  }
}; // VBHover directive


export var VBHover = {
  bind: directive,
  componentUpdated: directive,
  unbind: function unbind(el) {
    directive(el, {
      value: null
    });
  }
};