ui/WrapLabel.js


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const ansi = require('../util/ansi')
const wrap = require('word-wrap')

const Label = require('./Label')

module.exports = 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(lines[i])
    }
  }

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

    const options = {width: this.w, indent: ''}
    return wrap(this.text, options).split('\n')
      .map(l => l.trim())
  }

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

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