Adding Image-Dragging Behavior
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Image;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.IOException;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.TransferHandler;
public class DragImage {
public static void main(String args[]) {
JFrame frame = new JFrame("Clip Image");
Container contentPane = frame.getContentPane();
final Clipboard clipboard = frame.getToolkit().getSystemClipboard();
Icon icon = new ImageIcon("jaeger.jpg");
final JLabel label = new JLabel(icon);
label.setTransferHandler(new ImageSelection());
MouseListener mouseListener = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
JComponent comp = (JComponent) e.getSource();
TransferHandler handler = comp.getTransferHandler();
handler.exportAsDrag(comp, e, TransferHandler.COPY);
}
};
label.addMouseListener(mouseListener);
JScrollPane pane = new JScrollPane(label);
contentPane.add(pane, BorderLayout.CENTER);
JButton copy = new JButton("Copy");
copy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
TransferHandler handler = label.getTransferHandler();
handler.exportToClipboard(label, clipboard,
TransferHandler.COPY);
}
});
JButton clear = new JButton("Clear");
clear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
label.setIcon(null);
}
});
clear.setTransferHandler(new TransferHandler("text"));
mouseListener = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
JComponent comp = (JComponent) e.getSource();
TransferHandler handler = comp.getTransferHandler();
handler.exportAsDrag(comp, e, TransferHandler.COPY);
}
};
clear.addMouseListener(mouseListener);
JButton paste = new JButton("Paste");
paste.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
Transferable clipData = clipboard.getContents(clipboard);
if (clipData != null) {
if (clipData.isDataFlavorSupported(DataFlavor.imageFlavor)) {
TransferHandler handler = label.getTransferHandler();
handler.importData(label, clipData);
}
}
}
});
JPanel p = new JPanel();
p.add(copy);
p.add(clear);
p.add(paste);
contentPane.add(p, BorderLayout.SOUTH);
JTextField tf = new JTextField();
tf.setDragEnabled(true);
contentPane.add(tf, BorderLayout.NORTH);
frame.setSize(300, 300);
frame.show();
}
}
class ImageSelection extends TransferHandler implements Transferable {
private static final DataFlavor flavors[] = { DataFlavor.imageFlavor };
private JLabel source;
private Image image;
public int getSourceActions(JComponent c) {
return TransferHandler.COPY;
}
public boolean canImport(JComponent comp, DataFlavor flavor[]) {
if (!(comp instanceof JLabel)) {
return false;
}
for (int i = 0, n = flavor.length; i < n; i++) {
for (int j = 0, m = flavors.length; j < m; j++) {
if (flavor[i].equals(flavors[j])) {
return true;
}
}
}
return false;
}
public Transferable createTransferable(JComponent comp) {
// Clear
source = null;
image = null;
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
Icon icon = label.getIcon();
if (icon instanceof ImageIcon) {
image = ((ImageIcon) icon).getImage();
source = label;
return this;
}
}
return null;
}
public boolean importData(JComponent comp, Transferable t) {
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
if (t.isDataFlavorSupported(flavors[0])) {
try {
image = (Image) t.getTransferData(flavors[0]);
ImageIcon icon = new ImageIcon(image);
label.setIcon(icon);
return true;
} catch (UnsupportedFlavorException ignored) {
} catch (IOException ignored) {
}
}
}
return false;
}
// Transferable
public Object getTransferData(DataFlavor flavor) {
if (isDataFlavorSupported(flavor)) {
return image;
}
return null;
}
public DataFlavor[] getTransferDataFlavors() {
return flavors;
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavor.equals(DataFlavor.imageFlavor);
}
}
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