CueTreeTransferHandler.java

package net.squiz.cuetree;

import javax.swing.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.util.*;

public class CueTreeTransferHandler extends TransferHandler {

    public CueTreeTransferHandler() {
        System.out.println("DragAndDropTransferHandler created");
    }

    public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) {

        for (int i = 0; i < transferFlavors.length; i++) {
            if (transferFlavors[i].equals(DataFlavor.javaFileListFlavor)) {
                System.out.println("was a file");
                return true;
            }
        }
        System.out.println("There were no files in the clipboard");
        return false;
    }

    public boolean importData(JComponent c, Transferable t) {

        System.out.println("Start of importData");

        if (t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
            List files = null;
            try {
                files = (List) t.getTransferData(DataFlavor.javaFileListFlavor);
            } catch (Exception e) {
                e.printStackTrace();
            }
            System.out.println(files);
        } else {
            System.out.println("Was not a file");
        }

        System.out.println("importing data");
        return true;
    }
}