@gravity-ui/graph/build/components/canvas/blocks/controllers/BlockController.js

Modern graph editor component

import { ESelectionStrategy } from "../../../../services/selection/types";
import { isMetaKeyEvent } from "../../../../utils/functions";
/**
 * BlockController handles click events for block selection.
 * Drag behavior is now managed by DragService.
 */
export class BlockController {
    constructor(block) {
        block.addEventListener("click", (event) => {
            /**
             * Prevent propagate to camera
             * Click on camera will reset selection
             */
            event.stopPropagation();
            block.context.graph.api.selectBlocks([block.props.id], 
            /**
             * On click with meta key we want to select only one block, otherwise we want to toggle selection
             */
            !isMetaKeyEvent(event) ? true : !block.state.selected, 
            /**
             * On click with meta key we want to append selection, otherwise we want to replace selection
             */
            !isMetaKeyEvent(event) ? ESelectionStrategy.REPLACE : ESelectionStrategy.APPEND);
        });
    }
}