GUI App snippet for testing out line count in JTextArea

MainJTextArea.kt

package lt.linecounter

import org.slf4j.Logger
import org.slf4j.LoggerFactory
import java.awt.*
import java.awt.event.ComponentAdapter
import java.awt.event.ComponentEvent
import javax.swing.JFrame
import javax.swing.JPanel
import javax.swing.JTextArea
import javax.swing.SwingUtilities

class MainJTextArea(
    private val l: Logger
): JPanel(GridBagLayout()) {

    init {
        val inputStr = "Lorem ipsum dolor sit amet, consectetur adipisicing\n elit, sed do eiusmo," +
                " Lorem ipsum \ndolor sit amet, consectetur adipisicing elit, sed do eiusmo," +
                " Lorem ipsum dolor sit amet, \nconsectetur adipisicing elit, sed do eiusmo," +
                " Lorem ipsum dolor sit amet, \nconsectetur adipisicing elit, sed do eiusmo"

        val textArea = drawTextArea(
            text = inputStr,
            fontSize = 12.0
        )
        val textAreaLineCounter = TextAreaLineCounter(textArea)

        // Add Components to this panel.
        val c = GridBagConstraints().apply {
            gridwidth = GridBagConstraints.REMAINDER
            fill = GridBagConstraints.BOTH
            weightx = 1.0
            weighty = 1.0
        }
        add(textArea, c)
        addComponentListener(object : ComponentAdapter() {
            override fun componentResized(e: ComponentEvent?) {
                super.componentResized(e)
                l.debug("Line count: ${textAreaLineCounter.countLines()}")
            }
        })
    }

    private fun drawTextArea(
        text: String,
        fontSize: Double = 12.0
    ): JTextArea {
        val textArea = JTextArea(text)
        textArea.size = Dimension(width, height)
        textArea.foreground = Color.BLACK
        textArea.background = Color(0, 0, 0, 0)
        textArea.font = Font(null, Font.LAYOUT_LEFT_TO_RIGHT, fontSize.toInt())
        textArea.lineWrap = true
        textArea.wrapStyleWord = true
        return textArea
    }

    companion object {
        @JvmStatic
        fun main(args: Array<String>) {
            val logger = LoggerFactory.getLogger(MainJTextArea::class.java)!!
            SwingUtilities.invokeLater {
                val frame = JFrame("JTextAreaLineCountDemo").apply {
                    preferredSize = Dimension(400, 360)
                    defaultCloseOperation = JFrame.EXIT_ON_CLOSE
                    add(MainJTextArea(logger))
                    pack()
                }
                frame.isVisible = true
            }
        }
    }
}