tui-lib/ui/presentation/WrapLabel.js

import * as ansi from 'tui-lib/util/ansi'

import Label from './Label.js'

export default class WrapLabel extends Label {
  // A word-wrapping text display. Given a width, wraps text to fit.

  constructor(...args) {
    super(...args)
  }

  fixLayout() {
    // Override Label.fixLayout to do nothing. We don't want to make the
    // width of this label be set to the content of the text! (That would
    // defeat the entire point of word wrapping.)
  }

  writeTextTo(writable) {
    const lines = this.getWrappedLines()
    for (let i = 0; i < lines.length; i++) {
      writable.write(ansi.moveCursor(this.absTop + i, this.absLeft))
      writable.write(this.processFormatting(lines[i]))
    }
  }

  getWrappedLines() {
    if (this.text.trim().length === 0) {
      return []
    }

    return ansi.wrapToColumns(this.text, this.w - 1).map(l => l.trim())
  }

  get h() {
    return this.getWrappedLines().length
  }

  set h(newHeight) {
    // Do nothing. Height is computed on the fly.
  }
}