ListDrop.java Source code

Introduction

Here is the source code for ListDrop.java

Source

import java.awt.FlowLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;

import javax.swing.DefaultListModel;
import javax.swing.DropMode;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.TransferHandler;

public class ListDrop {

    class ListHandler extends TransferHandler {
        public boolean canImport(TransferSupport support) {
            if (!support.isDrop()) {
                return false;
            }

            return support.isDataFlavorSupported(DataFlavor.stringFlavor);
        }

        public boolean importData(TransferSupport support) {
            if (!canImport(support)) {
                return false;
            }

            Transferable transferable = support.getTransferable();
            String line;
            try {
                line = (String) transferable.getTransferData(DataFlavor.stringFlavor);
            } catch (Exception e) {
                return false;
            }
            JList.DropLocation dl = (JList.DropLocation) support.getDropLocation();
            int index = dl.getIndex();
            model.add(index++, line);
            return true;
        }
    }

    JTextField field = new JTextField(20);

    DefaultListModel model = new DefaultListModel();

    public ListDrop() {
        JFrame f = new JFrame();
        JList list = new JList(model);
        list.setDropMode(DropMode.INSERT);
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        list.setTransferHandler(new ListHandler());

        field.setDragEnabled(true);
        f.setLayout(new FlowLayout());
        f.add(new JScrollPane(list));
        f.add(field);
        f.pack();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        new ListDrop();
    }
}