analytics/webcontent/bi/js/dashboard-analytics/visualizations/renderer/vipr3/VIPREventTarget.js

'use strict';

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

/**
*+------------------------------------------------------------------------+
*| Licensed Materials - Property of IBM
*| IBM Cognos Products: Dashboard
*| (C) Copyright IBM Corp. 2017, 2020
*|
*| US Government Users Restricted Rights - Use, duplication or disclosure
*| restricted by GSA ADP Schedule Contract with IBM Corp.
*+------------------------------------------------------------------------+
*/
define(['jquery', '../common/EventTarget', '../../../apiHelpers/SlotAPIHelper', 'underscore', '../VisEventHandler', '../../vipr/VIPRUtils', '../../../lib/@waca/core-client/js/core-client/utils/BrowserUtils', '../../vipr/data/VIPRCatContDataItem', './VIPRDataPointSummarizer'], function ($, EventTarget, SlotAPIHelper, _, VisEventHandler, VIPRUtils, BrowserUtils, VIPRCatContDataItem, VIPRDataPointSummarizer) {

	var ZOOM_VELOCITY = 0.002;
	var TOUCHMARGIN = 1;

	var VIPRTYPE = {
		CUSTOMDATA: 'customdata',
		DATAPOINT: 'datapoint',
		ITEMCLASS: 'itemclass',
		ITEM: 'item',
		DATAITEM: 'dataitem',
		TUPLE: 'tuple',
		VALUE: 'value',
		INVALID: null,
		EMPTY: 'empty'
	};

	var CUSTOMDATATYPE = {
		KEYDRIVERSHOW: 'keydriver_show',
		DRIVERINFO: 'driverinfo',
		TREENODEINFO: 'treenodeinfo'
	};

	var VIPRDATAPOINTTYPE = {
		VALUE: 'value',
		TUPLE: 'tuple'
	};

	var VIPREventTarget = function (_EventTarget) {
		_inherits(VIPREventTarget, _EventTarget);

		function VIPREventTarget() {
			var _ret;

			_classCallCheck(this, VIPREventTarget);

			for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
				args[_key] = arguments[_key];
			}

			var _this = _possibleConstructorReturn(this, _EventTarget.call.apply(_EventTarget, [this].concat(args)));

			var options = args[0] || {};
			_this.viprWidget = options.viprWidget;
			_this.viprInteractivity = _this.viprWidget.getInteractivity();

			// map from visDecorations to viprDecoration
			_this.viprDecorations = {};
			_this.viprDecorations[VisEventHandler.DECORATIONS.HIGHLIGHT] = 'highlighted';
			_this.viprDecorations[VisEventHandler.DECORATIONS.SELECT] = 'selected';
			_this.viprDecorations[VisEventHandler.DECORATIONS.TOOLTIP] = 'tooltip';

			_this.viprDataPointSummarizer = new VIPRDataPointSummarizer(_this.visualization);
			return _ret = _this.getAPI(), _possibleConstructorReturn(_this, _ret);
		}

		/**
   * remove viprWidget from event
   */


		VIPREventTarget.prototype.remove = function remove() {
			this.viprWidget = null;
			_EventTarget.prototype.remove.call(this);
		};
		/**
   * @override
   * Determine whether visualization state (ie. zoom, pan, scroll) can be restored
   * @return {boolean} true if the visualization state can be restored, otherwise false
   */


		VIPREventTarget.prototype.canRestore = function canRestore() {
			// state can be restore if
			// 1. interactivityState property is supportedAND
			// 2. autoZoom is disabled
			return VIPRUtils.isPropertyIncluded(this.visualization.getDefinition().getId(), 'interactivityState') && !this.content.getPropertyValue('autoZoom');
		};

		/**
   * @override
   * Restore the visualization state
   * @param {Object} state object containing the state of the visualization
   */


		VIPREventTarget.prototype.restore = function restore(state) {
			if (state && this.canRestore()) {
				this.viprWidget.setState(state);
			}
		};

		/**
   * Get the array of event targets based on the event.
   * Event target represents a data point object that corresponds to the event.
   * NOTES:
   *   Legend Titles are of type VIPRTYPE.DATAITEM which contain entries of type VIPRTYPE.TUPLE (note: 1 DATAITEM/TUPLE is returned for stacked legends)
   *	 Axis Titles are of type VIPRTYPE.ITEMCLASS which contain entries of type VIPRTYPE.ITEM (note: n ITEMCLASSES/ITEMS are returned for stacked axes.)
   *	 Chart elements (eg bubbles) are of type VIPRTYPE.DATAPOINT
   *
   * @param event	Event object
   */


		VIPREventTarget.prototype.getEventTargets = function getEventTargets(event, radius) {
			var clientX = this._getClientX(event);
			var clientY = this._getClientY(event);

			var visCoord = this.viprWidget.getVisCoordinate(clientX, clientY);
			var items = this.viprWidget.getItemsAtPoint(visCoord, radius);

			// for mobile events, we make a square around the event coords and return the items inside the square
			// if nothing was found - consider moving the isIPad check to visEventHandler in the future.
			if ((!items || items.length === 0) && BrowserUtils.isIPad()) {
				var coords = this._inflateCoordinates(clientX, clientY);
				return this.getTargetsByCords(coords, false);
			} else {
				var options = {
					visCoord: visCoord
				};
				return this._processItems(items, options);
			}
		};

		VIPREventTarget.prototype._inflateCoordinates = function _inflateCoordinates(clientX, clientY) {
			return [{ x: clientX - TOUCHMARGIN, y: clientY - TOUCHMARGIN }, { x: clientX + TOUCHMARGIN, y: clientY - TOUCHMARGIN }, { x: clientX + TOUCHMARGIN, y: clientY + TOUCHMARGIN }, { x: clientX - TOUCHMARGIN, y: clientY + TOUCHMARGIN }];
		};

		VIPREventTarget.prototype.getTargetsByCords = function getTargetsByCords(cords, summarize) {
			var targets;
			var visCords = cords.map(function (cord) {
				return this.viprWidget.getVisCoordinate(cord.x, cord.y);
			}.bind(this));
			var items = this.viprWidget.getItemsInPolygon(visCords);
			var options = {
				summarize: summarize,
				visCoord: visCords
			};
			targets = this._processItems(items, options);
			return targets;
		};

		/**
   * @override
   * Get the axis items from event and offset
   * @param event - the event as generated by visEventHandler
   * @param offset - an optional offset (in pixels) to ensure the line does not become the target of selections etc.
   * @return {object} The axis items
   */


		VIPREventTarget.prototype.getValuesAtPoint = function getValuesAtPoint(event, offset) {
			if (this.viprWidget && this.viprWidget.getVisCoordinate) {
				var eventOffset = offset || 0;
				var coord = this.viprWidget.getVisCoordinate(event.clientX + eventOffset, event.clientY - eventOffset);
				return this.viprWidget.getAxisItemsAtPoint(coord);
			}
		};

		/**
   * Visually decorate the targets.
   *
   * @param targets				Event targets
   * @param visDecorationName		Decoration name (ie. highlight, select)
   * @return true if target has been decorated, otherwise false
   */


		VIPREventTarget.prototype.decorateTarget = function decorateTarget(targets, visDecorationName, value) {
			var decorated = false;
			var viprDecorationName = this.viprDecorations[visDecorationName];
			if (viprDecorationName) {
				_.each(targets, function (target) {
					if (target.source && typeof target.source.decorate === 'function') {
						target.source.decorate(viprDecorationName, value);
						decorated = true;
					} else if (target.type === 'customdata') {
						// custom data decoration is handled by applyCustomDataSelection
						decorated = true;
					}
				});
			}
			return decorated;
		};

		/**
   * Obtain the decoration value from the given target item and decoration name
   * @param item	event target item containing the decoration
   * @param decorationName common decoration name defined by VisEventHandler.DECORATIONS
   */


		VIPREventTarget.prototype.getDecoration = function getDecoration(item, decorationName) {
			var viprDecorationName = this.viprDecorations[decorationName];
			if (viprDecorationName && item.source && typeof item.source.hasDecoration === 'function' && typeof item.source.getDecoration === 'function' && item.source.hasDecoration(viprDecorationName)) {
				return item.source.getDecoration(viprDecorationName);
			}
		};

		/**
   * Complete the series of decorations.
   * After clearing and adding multiple decorations, complete the decorations by rendering the visualization.
   */


		VIPREventTarget.prototype.completeDecorations = function completeDecorations() {
			this.viprWidget.render('client');
		};

		/**
   * Apply selection on customdata target.
   *
   * @param {ArrayOfObject} targets	Event targets
   */


		VIPREventTarget.prototype.applyCustomDataSelection = function applyCustomDataSelection(targets, options) {
			var target = _.isArray(targets) ? targets[0] : targets; //Sample the targets
			// target is empty when all decorations needs to be cleared
			// otherwise the decorating target item type needs to be customdata
			if (!target || target.type === VIPRTYPE.CUSTOMDATA && !this._isLengendAndEncodingPayload(target)) {
				//todo: need to make custom data decoration consistent with other data;
				this._handleCustomDataDecorations(targets, options);
			}
		};

		//TODO: post Endor R1, we will remove this check and re-enable Comet Chart Legend integration


		VIPREventTarget.prototype._isLengendAndEncodingPayload = function _isLengendAndEncodingPayload(item) {
			if (item.area === 'legend' && item.values && item.values.length === 1) {
				var payload = item.values[0].payload;
				return payload && payload.type === 'encoding';
			}
			return false;
		};

		/**
   * Return the list of custom data selections in label/value pair
   * @param {Object} target event target item of the selected custom data
   */


		VIPREventTarget.prototype.getCustomDataSelections = function getCustomDataSelections(target) {
			var selections = [];
			if (target) {
				_.each(target.values, function (value) {
					var tooltip = value.payload && value.payload.tooltip;
					if (tooltip) {
						// append the name/value pairs
						if (tooltip.getLines) {
							var lines = tooltip.getLines();
							if (lines && lines.length > 0) {
								selections.push.apply(selections, tooltip.getLines());
							}
						}
						// only has generated string caption value without a name/value pair
						if (tooltip.getCaption) {
							var caption = tooltip.getCaption();
							if (caption) {
								selections.push({
									value: caption
								});
							}
						}
					}
				});
			}
			return selections;
		};

		/**
   * Determine whether the given interactivity state should be handled
   * @param {Object} state visualization interactivity state
   * @return visualization interactivity state if it's supported, otherwise false
   */


		VIPREventTarget.prototype._handleInteractivityState = function _handleInteractivityState(state) {
			return VIPRUtils.isPropertyIncluded(this.visualization.getDefinition().getId(), 'interactivityState') ? state : undefined;
		};

		/**
   * Determine whether the vipr visualization supports pan and zoom
   */


		VIPREventTarget.prototype.canZoom = function canZoom() {
			return this.viprInteractivity ? this.viprInteractivity.canZoom() : false;
		};

		/**
   * Start the zooming session with the VIPR visualization
   *
   * @param event Event object
   */


		VIPREventTarget.prototype.zoomStart = function zoomStart(event) {
			if (this.viprInteractivity) {
				try {
					// in case of a two touch gesture zoom, use the center coordinates of the hammer gesture event
					var coordinates = event.gesture ? event.gesture.center : event;
					var visCoord = this.viprWidget.getVisCoordinate(this._getClientX(coordinates), this._getClientY(coordinates));
					this.viprInteractivity.startInteractivity(visCoord);
					// initialize the gesture scale to 1 as we start zoom
					this.gestureScale = 1;
				} catch (err) {
					console.warn(err);
				}
			}
		};

		/**
   * Apply zoom to the VIPR visualization
   *
   * @param event Event object
   */


		VIPREventTarget.prototype.zoom = function zoom(event) {
			if (this.viprInteractivity) {
				try {
					// in case of a two touch gesture zoom, use the center coordinates of the hammer gesture event
					var coordinates = event.gesture ? event.gesture.center : event;
					var visCoord = this.viprWidget.getVisCoordinate(this._getClientX(coordinates), this._getClientY(coordinates));
					var scale = this._getZoomScale(event);
					this.viprInteractivity.zoom(visCoord, scale);
				} catch (err) {
					console.warn(err);
				}
			}
		};

		/**
   * End the zooming session with the VIPR visualization
   *
   * @param event Event object
   * @returns {Object|undefined} interactivity state containing the zoom level OR undefined if state is not supported
   */


		VIPREventTarget.prototype.zoomEnd = function zoomEnd(event) {
			if (this.viprInteractivity) {
				try {
					// in case of a two touch gesture zoom, use the center coordinates of the hammer gesture event
					var coordinates = event.gesture ? event.gesture.center : event;
					var visCoord = this.viprWidget.getVisCoordinate(this._getClientX(coordinates), this._getClientY(coordinates));
					this.viprInteractivity.endInteractivity(visCoord);
					// disable the gesture scale as we end zoom
					this.gestureScale = 0;
					return this._handleInteractivityState(this.viprWidget.getState());
				} catch (err) {
					console.warn(err);
				}
			}
		};

		/**
   * Start the panning session with VIPR visualization
   *
   * @param event Event object
   */


		VIPREventTarget.prototype.panStart = function panStart(event) {
			if (this.viprInteractivity) {
				try {
					var visCoord = this.viprWidget.getVisCoordinate(this._getClientX(event), this._getClientY(event));
					this.viprInteractivity.startInteractivity(visCoord);
				} catch (err) {
					console.warn(err);
				}
			}
		};

		/**
   * Apply panning to the VIPR visualization
   *
   * @param event Event object
   */


		VIPREventTarget.prototype.pan = function pan(event) {
			if (this.viprInteractivity) {
				try {
					var visCoord = this.viprWidget.getVisCoordinate(this._getClientX(event), this._getClientY(event));
					this.viprInteractivity.translate(visCoord);
				} catch (err) {
					console.warn(err);
				}
			}
		};

		/**
   * End the panning session with VIPR visualization
   *
   * @param event Event object
   * @returns {Object|undefined} interactivity state containing the pan OR undefined if state is not supported
   */


		VIPREventTarget.prototype.panEnd = function panEnd(event) {
			if (this.viprInteractivity) {
				try {
					var visCoord = this.viprWidget.getVisCoordinate(this._getClientX(event), this._getClientY(event));
					this.viprInteractivity.endInteractivity(visCoord);
					return this._handleInteractivityState(this.viprWidget.getState());
				} catch (err) {
					console.warn(err);
				}
			}
		};

		VIPREventTarget.prototype.processKeyDown = function processKeyDown() {
			return false;
		};

		/**
   * @private
   * @function _getClientX
   * Get the clientX property from the given event
   * @param {Object} event - the event object
   * @returns clientX value of the event
   */


		VIPREventTarget.prototype._getClientX = function _getClientX(event) {
			return event.hasOwnProperty('clientX') ? event.clientX : event.originalEvent.clientX;
		};

		/**
   * @private
   * @function __getClientY
   * Get the clientY property from the given event
   * @param {Object} event - the event object
   * @returns clientY value of the event
   */


		VIPREventTarget.prototype._getClientY = function _getClientY(event) {
			return event.hasOwnProperty('clientY') ? event.clientY : event.originalEvent.clientY;
		};

		VIPREventTarget.prototype._processItems = function _processItems(items, options) {
			var _this2 = this;

			var targets;
			var summarize = options.summarize;
			var visCoord = options.visCoord;

			switch (this._getTargetType(items)) {
				case VIPRTYPE.DATAPOINT:
					{
						var shouldDataItemsSummarize = VIPRUtils.doesConfigPropertyMatchExpected(this.visualization.getDefinition().getId(), 'shouldMultiPointSelectionSummarize', true);
						targets = this._processDataPointTargets(items, summarize || shouldDataItemsSummarize);
						break;
					}
				case VIPRTYPE.VALUE:
					targets = this._processValueTargets(items);
					break;
				case VIPRTYPE.ITEM:
				case VIPRTYPE.TUPLE:
					targets = this._processTupleItemTargets(items);
					break;
				case VIPRTYPE.ITEMCLASS:
				case VIPRTYPE.DATAITEM:
					targets = this._processDataItemClassTargets(items);
					break;
				case VIPRTYPE.CUSTOMDATA:
					targets = this._processCustomDataTargets(items);
					break;
				case VIPRTYPE.EMPTY:
					targets = [];
					break;
				// invalid or unknown target
				case VIPRTYPE.INVALID:
				default:
					targets = null;
			}

			_.each(targets, function (target) {
				// Attach the clicked area to the target. The area could be of values: visualization, legend, or none
				if (visCoord && visCoord.area) {
					target.area = visCoord.area;
					target.selectionContext = {
						actions: {
							actionOptions: { TextAction: { area: visCoord.area } }
						}
					};
				}
				// add datasetId;
				target.datasetId = _this2._datasetId(target);
			});

			return targets;
		};

		VIPREventTarget.prototype._getTargetType = function _getTargetType(items) {
			if (!items) {
				return VIPRTYPE.INVALID;
			}
			return items.length > 0 ? items[0].infoType : VIPRTYPE.EMPTY;
		};

		VIPREventTarget.prototype._processValueTargets = function _processValueTargets(items) {
			var targets = [];
			_.each(items, function (item) {
				var valueObj = item.source;
				var slotIndex = valueObj.getIndex();

				// build a sparse values array
				// this allows re-using the existing datapoint mechanism with values
				var values = [];
				values[slotIndex] = [item.value];

				targets.push({
					key: 'value_' + slotIndex,
					type: VIPRTYPE.DATAPOINT,
					source: valueObj,
					values: values
				});
			});
			return targets;
		};

		VIPREventTarget.prototype._processDataPointTargets = function _processDataPointTargets(items, summarize) {
			var _this3 = this;

			var targets = [];
			summarize = typeof summarize === 'undefined' ? true : summarize;

			//The first slot in a selection is its topmost layer in the selection (the selectedLayer).
			//The datapoint target will be for that layer.
			var selectedLayer = null;
			_.each(items, function (item) {
				var slotAPIs = _this3._getSlotAPIsForItem(item);
				var slotLayer = slotAPIs && slotAPIs[0].getDefinition().getDatasetIdList()[0];
				if (!selectedLayer || slotLayer === selectedLayer) {
					selectedLayer = slotLayer;
					targets.push({
						key: item.key + ':' + slotLayer,
						type: VIPRTYPE.DATAPOINT,
						source: item.source,
						values: _this3._itemRowToTargetValues(item.row),
						slotAPIs: slotAPIs,
						onlyGlobalActions: _this3._isForecastData(item.source)
					});
				}
			});

			// Summarize multiple datapoint targets (area chart)

			if (targets.length && summarize) {
				//TODO: Temporarily wire of summarize dataPoint targets.
				targets = this.viprDataPointSummarizer.summarizeDataPointTargets(targets);
			}
			return targets;
		};

		VIPREventTarget.prototype._getSlotAPIsForItem = function _getSlotAPIsForItem(item) {
			var slotAPIs = item.source && item.source.dataset && item.source.dataset.slotAPIs;
			if (!slotAPIs && item.source && item.source.dataset) {
				// the latest implementation of VIPRData does not supply the SlotAPIs
				// this is rather intentional, and can rather provide the id of the source dataset
				// @todo this needs to be revised so that the EventTargets simply returns a datasetId, not the list of SlotAPIs
				slotAPIs = SlotAPIHelper.getMappedSlotListByDataset(this.visualization, item.source.dataset.getId());
			}
			if (slotAPIs && this._isForecastData(item.source)) {
				return slotAPIs.map( //Position of each slot matters, but we don't want numerical slots, so replace them with null
				function (slot) {
					return slot.getDataItemList().find(function (dataItem) {
						return dataItem.getType() === 'fact';
					}) ? null : slot;
				});
			}
			return slotAPIs;
		};

		VIPREventTarget.prototype._datasetId = function _datasetId(item) {
			return item && item.source && item.source.dataset && item.source.dataset.getId && item.source.dataset.getId();
		};
		//This function is called for both VIPRTYPE.ITEM and VIPRTYPE.TUPLE
		//VIPRTYPE.ITEM corresponds to elements such as axis labels (eg in a bar chart)
		//When axis labels are stacked, there will be n items of type VIPRTYPE.ITEM
		//VIPRTYPE.TUPLE corresponds to elements such as legend labels (type VIPRTYPE.TUPLE).


		VIPREventTarget.prototype._processTupleItemTargets = function _processTupleItemTargets(items) {
			var _this4 = this;

			var targets = [];
			_.each(items, function (item) {
				var source = item.source;
				var onlyGlobalActions = false;
				if (source.datapoints && source.datapoints.length > 0) {
					onlyGlobalActions = _this4._isForecastData(source.datapoints[0]) || false;
				}
				if (source) {
					targets.push({
						key: item.key || item.getUniqueName(),
						type: VIPRTYPE.ITEM,
						source: source,
						values: _this4.viprDataPointSummarizer.summarizeDataPointValues(source.datapoints, source.indexes.dataitem, source),
						isEdgeSelect: true,
						onlyGlobalActions: onlyGlobalActions
					});
				}
			});

			if (items.length > 1) {
				targets = this._mergeTupleItemTargets(targets);
			}
			return targets;
		};

		VIPREventTarget.prototype._processDataItemClassTargets = function _processDataItemClassTargets(items) {
			var _this5 = this;

			var targets = [];
			_.each(items, function (item) {
				var values = [];
				var slotIds = _.map(_this5.visualization.getSlots().getMappedSlotList(), function (slot) {
					return slot.getId();
				});
				var slotIndex = slotIds.indexOf(item.slotDef.name);
				if (slotIndex > -1) {
					values[slotIndex] = [{
						u: item.source.getUniqueName(),
						d: item.source.getCaption()
					}];

					targets.push({
						key: item.source.getUniqueName(),
						type: VIPRTYPE.ITEMCLASS,
						source: item.source,
						values: values
					});
				}
			});
			return targets;
		};

		VIPREventTarget.prototype._processCustomDataTargets = function _processCustomDataTargets(items) {
			var targets = [];
			_.each(items, function (item) {
				targets.push({
					key: item.id,
					type: item.infoType,
					source: {},
					values: [{ payload: item.payload, customType: item.type }]
				});
			});
			return targets;
		};

		VIPREventTarget.prototype._itemRowToTargetValues = function _itemRowToTargetValues(row) {
			var targetValues = [];
			if (row) {
				row.forEach(function (data, indexInRow) {
					if (data.infoType === VIPRDATAPOINTTYPE.VALUE) {
						// Don't assume that the indexInRow is the same as the slot index
						// there could be a slot that contains multiple dataitems
						// We get the slot index from dataItem.indexes.dataitem
						var slotIndex = data.dataItem && data.dataItem.source && data.dataItem.source.indexes && data.dataItem.source.indexes.dataitem;

						if (slotIndex == null) {
							// not sure if we would ever run into this.. but just in case we have scenarios where the slots index is not found
							slotIndex = indexInRow;
						}

						if (!targetValues[slotIndex]) {
							targetValues[slotIndex] = [];
						}
						var values = targetValues[slotIndex];

						var multiMeasureSeries = _.find(row, function (data) {
							return data.key && data.key.indexOf(SlotAPIHelper.MULTI_MEASURES_SERIES) === 0;
						});
						var index = multiMeasureSeries ? multiMeasureSeries.index : values.length;
						if (data.dataItem && data.dataItem.source instanceof VIPRCatContDataItem) {
							values[index] = {
								u: data.value,
								d: data.value
							};
						} else {
							// if possible, use the raw data
							values[index] = data.source && data.source.getRawValue ? data.source.getRawValue() : data.value;
						}
					} else {
						targetValues[indexInRow] = _.map(data.items, function (catItem) {
							return {
								u: catItem.source.item.u,
								d: catItem.source.item.d,
								p: catItem.source.item.p

							};
						});
					}
				});
			}

			return targetValues;
		};

		/**
   * Merge the multiple nested tuple items to one target
   */


		VIPREventTarget.prototype._mergeTupleItemTargets = function _mergeTupleItemTargets(prevTargets) {
			var params = [true, {}];
			return [$.extend.apply($, params.concat(prevTargets))];
		};

		VIPREventTarget.prototype._handleCustomDataDecorations = function _handleCustomDataDecorations(items, options) {
			var decorations = [];

			// Decorate all items found under the pointer
			_.chain(items).pluck('values').flatten().each(function (value) {
				if (_.contains(CUSTOMDATATYPE, value.customType)) {
					decorations.push({
						id: value.payload.id,
						value: true
					});
				}
			});

			this.visAPI.setCustomDataDecoration('selected', decorations, options);
		};

		/**
   * Get the zoom scale from the event
   */


		VIPREventTarget.prototype._getZoomScale = function _getZoomScale(event) {
			if (event.gesture) {
				// default the gesture scale to 1 as we start zoom
				var previousScale = this.gestureScale || 1;
				// update the previous gesture scale
				this.gestureScale = event.gesture.scale;
				// calculate gesture zoom scale
				return event.gesture.scale / previousScale;
			} else {
				var deltaMode = event.originalEvent.deltaMode;
				var delta = event.originalEvent.deltaY;
				// FireFox case: deltaMode is always 1 for zoom in/out. Formula is the same as VIDA demo page
				if (deltaMode === 1) {
					delta = delta * 100 / 3;
				}

				// Follow VIDA demo to use deltaY. Formula used to calculate the scale is 1 - .002 * i, where i = event.deltaY
				return 1 - ZOOM_VELOCITY * delta;
			}
		};

		/**
  * Checks item source's to see if it contains forecast info
  * @param {Object} itemSource - target item.source
  * @return true if the target item is forecast data, otherwise false
  */


		VIPREventTarget.prototype._isForecastData = function _isForecastData(itemSource) {
			return itemSource && itemSource.deco && itemSource.deco.forecast;
		};

		return VIPREventTarget;
	}(EventTarget);

	return VIPREventTarget;
});
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