analytics/webcontent/bi/js/dashboard-analytics/visualizations/interactions/lassoSelect/LassoController.js

/**
 * Licensed Materials - Property of IBM
 *
 * IBM Cognos Products: BI
 *
 * Copyright IBM Corp. 2017, 2019
 *
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

/**
 * @file Controller to handle lasso related logic such as: lasso activation,
 * lasso co-oridinate provision etc.
 */

'use strict';

define(['../../../lib/@waca/core-client/js/core-client/ui/core/Events', './LassoSelectView', 'dashboard-analytics/DynamicFileLoader'], function (Events, LassoSelectView, DynamicFileLoader) {

	var LassoController = Events.extend({

		/**
   * @param {Object} options.targetElement element (jquery)
   */
		init: function init(options) {
			var _views;

			LassoController.inherited('init', this, arguments);
			this.targetElement = options.targetElement;
			this.cordinateResolver = options.cordinateResolver;
			this.isDragging = options.isDragging;
			this._views = (_views = {}, _views[LassoController.DEFAULT_VIEW_ID] = { promise: Promise.resolve([LassoSelectView]), id: LassoController.DEFAULT_VIEW_ID }, _views); //Default view
			this.dashboard = options.dashboard;
			this._loadViewExts();
		},

		_loadViewExts: function _loadViewExts() {
			var _this = this;

			this.dashboard && this.dashboard.getCollectionExtension('com.ibm.bi.dashboard.live-lassoView').then(function (views) {
				return views.forEach(function (view) {
					return _this._views[view.id] = { promise: DynamicFileLoader.load([view.class]), css: view.css, id: view.id };
				});
			});
		},

		_loadCss: function _loadCss(href) {
			var head = document.getElementsByTagName('head')[0];
			var stylesheet = head.querySelectorAll('[href=\'' + href + '\']');
			if (!stylesheet.length) {
				var link = document.createElement('link');
				link.rel = 'stylesheet';
				link.type = 'text/css';
				link.href = href;
				link.media = 'all';
				head.appendChild(link);
			}
		},


		/**
   * Activate/Deactivate lasso selection mode
   * @param {boolean} [state=false] - state of lasso mode. True activates and
   * false deactivates the lasso mode. Defaults to false.
   */
		activateLassoMode: function activateLassoMode(state, viewId) {
			var _this2 = this;

			var _state = state || false;
			if (_state) {
				var _ref = this._views[viewId] || this._views[LassoController.DEFAULT_VIEW_ID],
				    promise = _ref.promise,
				    css = _ref.css,
				    id = _ref.id;

				this.viewId = id;
				if (css) {
					this._loadCss(css);
				}
				return promise.then(function (modules) {
					_this2.view = new modules[0](_this2.targetElement, _this2.cordinateResolver, _this2.isDragging);
					_this2.view.on('all', _this2._handleViewEvent, _this2);
				});
			} else if (this.isLassoMode()) {
				this.view.off('all', this._handleViewEvent, this);
				this.view.remove();
				this.view = null;
				this.viewId = '';
			}
			return Promise.resolve();
		},

		/**
   * @return True if lasso mode is active, false otherwise.
   */
		isLassoMode: function isLassoMode() {
			return !!this.viewId;
		},

		/**
  * Handler view event
  */
		_handleViewEvent: function _handleViewEvent(payload, eventName) {
			this.trigger(eventName, payload);
		},

		getCoordinates: function getCoordinates() {
			return this.view && this.view.getCoordinates();
		},
		getCurrentViewId: function getCurrentViewId() {
			return this.viewId;
		},


		remove: function remove() {
			this.activateLassoMode(false);
			LassoController.inherited('remove', this, arguments);
			this.targetElement = null;
		}
	});

	LassoController.DEFAULT_VIEW_ID = 'lw-lasso-select';

	return LassoController;
});
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