tui-lib/ui/controls/Button.js

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

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

export default class Button extends FocusElement {
  // A button.

  constructor(text) {
    super()

    this.text = text

    this.cursorX = null
    this.cursorY = null
  }

  fixLayout() {
    this.w = ansi.measureColumns(this.text)
    this.h = 1
  }

  drawTo(writable) {
    if (this.isSelected) {
      writable.write(ansi.invert())
    }

    writable.write(ansi.moveCursor(this.absTop, this.absLeft))
    writable.write(this.text)

    writable.write(ansi.resetAttributes())

    super.drawTo(writable)
  }

  keyPressed(keyBuf) {
    if (telc.isSelect(keyBuf)) {
      this.emit('pressed')
    }
  }

  clicked(button) {
    if (button === 'left') {
      if (this.isSelected) {
        this.emit('pressed')
      } else {
        this.root.select(this)
      }
    }
  }
}