bytedance-flowgram/packages/plugins/free-hover-plugin/src/selection-utils.ts

import { Rectangle } from '@flowgram.ai/utils';
import { WorkflowNodeEntity } from '@flowgram.ai/free-layout-core';
import { FlowNodeTransformData } from '@flowgram.ai/document';
import { type Entity } from '@flowgram.ai/core';

const BOUNDS_PADDING = 2;

export function getSelectionBounds(
  selection: Entity[],
  ignoreOneSelect: boolean = true // 忽略单选
): Rectangle {
  const selectedNodes = selection.filter((node) => node instanceof WorkflowNodeEntity);

  // 选中单个的时候不显示
  return selectedNodes.length > (ignoreOneSelect ? 1 : 0)
    ? Rectangle.enlarge(selectedNodes.map((n) => n.getData(FlowNodeTransformData)!.bounds)).pad(
        BOUNDS_PADDING
      )
    : Rectangle.EMPTY;
}