Label DnD (Drag and Drop)
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/*
* LabelDnD.java is a 1.4 example that requires no other files.
*/
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.TransferHandler;
import javax.swing.border.TitledBorder;
public class LabelDnD extends JPanel {
JTextField textField;
JLabel label;
public LabelDnD() {
super(new GridLayout(2, 1));
textField = new JTextField(40);
textField.setDragEnabled(true);
JPanel tfpanel = new JPanel(new GridLayout(1, 1));
TitledBorder t1 = BorderFactory
.createTitledBorder("JTextField: drag and drop is enabled");
tfpanel.add(textField);
tfpanel.setBorder(t1);
label = new JLabel("I'm a Label!", SwingConstants.LEADING);
label.setTransferHandler(new TransferHandler("text"));
MouseListener listener = new DragMouseAdapter();
label.addMouseListener(listener);
JPanel lpanel = new JPanel(new GridLayout(1, 1));
TitledBorder t2 = BorderFactory
.createTitledBorder("JLabel: drag from or drop to this label");
lpanel.add(label);
lpanel.setBorder(t2);
add(tfpanel);
add(lpanel);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
}
private class DragMouseAdapter extends MouseAdapter {
public void mousePressed(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
TransferHandler handler = c.getTransferHandler();
handler.exportAsDrag(c, e, TransferHandler.COPY);
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("LabelDnD");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new LabelDnD();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
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