Drag and drop example

draganddrop.kt

package dnd

import java.awt.*
import java.awt.dnd.*
import javax.swing.*

fun main(args: Array<String>) {
    SwingUtilities.invokeAndWait {
        val f = JFrame("test")
        f.defaultCloseOperation = JFrame.EXIT_ON_CLOSE
        f.isLocationByPlatform = true
        f.preferredSize = Dimension(800, 600)
        f.size = Dimension(800, 600)
        f.isVisible = true

        val dl = object : DropTargetListener {
            override fun drop(dtde: DropTargetDropEvent?) {
                println("drop")
            }

            override fun dragOver(dtde: DropTargetDragEvent?) {
                println("over")
            }

            override fun dragExit(dte: DropTargetEvent?) {
                println("exit")
            }

            override fun dropActionChanged(dtde: DropTargetDragEvent?) {
                println("changed")
            }

            override fun dragEnter(dtde: DropTargetDragEvent?) {
                println("enter")
            }
        }

        val target = DropTarget(f, DnDConstants.ACTION_COPY_OR_MOVE, dl, true)
    }
}