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/** * Copyright (c) 2017 ~ present NAVER Corp. * billboard.js project is licensed under the MIT license */import {select as d3Select} from "d3-selection";import ChartInternal from "./ChartInternal";import CLASS from "../config/classes";import {extend, callFn} from "./util";
extend(ChartInternal.prototype, {	/**	 * Select a point	 * @private	 * @param {Object} target point	 * @param {Object} data	 * @param {Number} index	 */	selectPoint(target, d, i) {		const $$ = this;		const config = $$.config;		const isRotated = config.axis_rotated;		const cx = (isRotated ? $$.circleY : $$.circleX).bind($$);		const cy = (isRotated ? $$.circleX : $$.circleY).bind($$);		const r = $$.pointSelectR.bind($$);
		callFn(config.data_onselected, $$.api, d, target.node());
		// add selected-circle on low layer g		$$.main.select(`.${CLASS.selectedCircles}${$$.getTargetSelectorSuffix(d.id)}`)			.selectAll(`.${CLASS.selectedCircle}-${i}`)			.data([d])			.enter()			.append("circle")			.attr("class", () => $$.generateClass(CLASS.selectedCircle, i))			.attr("cx", cx)			.attr("cy", cy)			.attr("stroke", $$.color)			.attr("r", d2 => $$.pointSelectR(d2) * 1.4)			.transition()			.duration(100)			.attr("r", r);	},
	/**	 * Unelect a point	 * @private	 * @param {Object} target point	 * @param {Object} data	 * @param {Number} index	 */	unselectPoint(target, d, i) {		const $$ = this;
		callFn($$.config.data_onunselected, $$.api, d, target.node());
		// remove selected-circle from low layer g		$$.main.select(`.${CLASS.selectedCircles}${$$.getTargetSelectorSuffix(d.id)}`)			.selectAll(`.${CLASS.selectedCircle}-${i}`)			.transition()			.duration(100)			.attr("r", 0)			.remove();	},
	/**	 * Toggles the selection of points	 * @private	 * @param {Boolean} whether or not to select.	 * @param {Object} target point	 * @param {Object} data	 * @param {Number} index	 */	togglePoint(selected, target, d, i) {		const method = `${selected ? "" : "un"}selectPoint`;
		this[method](target, d, i);	},
	/**	 * Select a path	 * @private	 * @param {Object} target path	 * @param {Object} data	 */	selectPath(target, d) {		const $$ = this;		const config = $$.config;
		callFn(config.data_onselected, $$, d, target.node());
		if (config.interaction_brighten) {			target.style("filter", "brightness(1.25)");		}	},
	/**	 * Unelect a path	 * @private	 * @param {Object} target path	 * @param {Object} data	 */	unselectPath(target, d) {		const $$ = this;		const config = $$.config;
		callFn(config.data_onunselected, $$, d, target.node());
		if (config.interaction_brighten) {			target.transition().duration(100)				.style("fill", () => $$.color(d));		}	},
	/**	 * Toggles the selection of lines	 * @private	 * @param {Boolean} whether or not to select.	 * @param {Object} target shape	 * @param {Object} data	 * @param {Number} index	 */	togglePath(selected, target, d, i) {		this[			`${selected ? "" : "un"}selectPath`		](target, d, i);	},
	/**	 * Returns the toggle method of the target	 * @private	 * @param {Object} target shape	 * @param {Object} data	 * @returns {Function} toggle method	 */	getToggle(that, d) {		const $$ = this;
		return that.nodeName === "path" ?			$$.togglePath : (				$$.isStepType(d) ?					() => {} : // circle is hidden in step chart, so treat as within the click area					$$.togglePoint			);	},
	/**	 * Toggles the selection of shapes	 * @private	 * @param {Object} target shape	 * @param {Object} data	 * @param {Number} index	 */	toggleShape(that, d, i) {		const $$ = this;		const config = $$.config;		const shape = d3Select(that);		const isSelected = shape.classed(CLASS.SELECTED);		const toggle = $$.getToggle(that, d).bind($$);		let toggledShape;
		if (config.data_selection_enabled && config.data_selection_isselectable(d)) {			if (!config.data_selection_multiple) {				let selector = `.${CLASS.shapes}`;
				if (config.data_selection_grouped) {					selector += $$.getTargetSelectorSuffix(d.id);				}
				$$.main.selectAll(selector)					.selectAll(`.${CLASS.shape}`)					.each(function(d, i) {						const shape = d3Select(this);
						if (shape.classed(CLASS.SELECTED)) {							toggledShape = shape;							toggle(false, shape.classed(CLASS.SELECTED, false), d, i);						}					});			}
			if (!toggledShape || toggledShape.node() !== shape.node()) {				shape.classed(CLASS.SELECTED, !isSelected);				toggle(!isSelected, shape, d, i);			}		}	},});