devextreme/esm/__internal/viz/sankey/tracker.js

JavaScript/TypeScript Component Suite for Responsive Web Development

/**
 * DevExtreme (esm/__internal/viz/sankey/tracker.js)
 * Version: 25.2.5
 * Build date: Fri Feb 20 2026
 *
 * Copyright (c) 2012 - 2026 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
import {
    Tracker
} from "../../viz/components/tracker";
import Sankey from "./sankey";
const proto = Sankey.prototype;
const DATA_KEY_BASE = "__sankey_data_";
let dataKeyModifier = 0;
proto._eventsMap.onNodeClick = {
    name: "nodeClick"
};
proto._eventsMap.onLinkClick = {
    name: "linkClick"
};
const getDataKey = function() {
    return DATA_KEY_BASE + dataKeyModifier++
};
export const plugin = {
    name: "tracker",
    init() {
        const that = this;
        const dataKey = getDataKey();
        that._tracker = new Tracker({
            widget: that,
            root: that._renderer.root,
            getData(e) {
                const target = e.target;
                return target[dataKey]
            },
            getNode(index) {
                if (index < that._nodes.length) {
                    return that._nodes[index]
                } else {
                    return that._links[index - that._nodes.length]
                }
            },
            click(e) {
                const eventName = this.getData(e.event) < that._nodes.length ? "nodeClick" : "linkClick";
                that._eventTrigger(eventName, {
                    target: e.node,
                    event: e.event
                })
            }
        });
        this._dataKey = dataKey
    },
    dispose() {
        this._tracker.dispose()
    },
    extenders: {
        _change_LINKS_DRAW() {
            const dataKey = this._dataKey;
            this._nodes.concat(this._links).forEach(((item, index) => {
                item.element.data(dataKey, index)
            }))
        }
    }
};