tui-lib/ui/presentation/HorizontalBox.js

import {DisplayElement} from 'tui-lib/ui/primitives'

export default class HorizontalBox extends DisplayElement {
  // A box that will automatically lay out its children in a horizontal row.

  fixLayout() {
    let nextX = 0
    for (const child of this.children) {
      child.x = nextX
      nextX = child.right + 1
    }
  }
}