Drag & Drop sample for SwingBuilder. for http://d.hatena.ne.jp/fumokmm/20110526/1306421368

ddSample.groovy

// cf. http://www.ne.jp/asahi/hishidama/home/tech/java/swing/DropTarget.html

import groovy.swing.SwingBuilder
import javax.swing.JFrame
import java.awt.dnd.DropTarget
import java.awt.dnd.DnDConstants
import java.awt.datatransfer.DataFlavor
import java.awt.datatransfer.Transferable

def swing = new SwingBuilder()
def frame = swing.frame(id   : 'mainFrame',
                        title: 'Groovy Logo Adder',
                        defaultCloseOperation: JFrame.EXIT_ON_CLOSE,
                        show : true,
                        size : [300, 100]) {
  label(text: 'Please Drag & Drop your icon file here.')
  mainFrame.dropTarget = [
    drop: { dtde ->
      def t = dtde.transferable
      if (t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
        dtde.acceptDrop(DnDConstants.ACTION_REFERENCE)
        t.getTransferData(DataFlavor.javaFileListFlavor).each {
          println it
        }
      }
    }
  ] as DropTarget
}