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|
package test;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.datatransfer.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.imageio.*;
import java.awt.BorderLayout;
/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2006</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class TestDnDContainer extends JPanel {
public TestDnDContainer() {
setTransferHandler(new DnDHandler());
DnDMouseListener listener = new DnDMouseListener();
addMouseListener(listener);
addMouseMotionListener(listener);
setLayout(new FlowLayout());
//setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
int childNumber = Math.max(1, (int) (10 * Math.random()));
System.out.printf("Creating %d sub-panels\n", childNumber);
for (int i = 0; i < childNumber; i++) {
add(new SignalPanel());
}
System.out.printf("Contains %d children\n", getComponentCount());
}
public static void main(String ...args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS));
frame.add(new TestDnDContainer());
frame.add(new TestDnDContainer());
frame.pack();
frame.setVisible(true);
}
});
}
private static class SignalPanel extends JPanel {
private static int ID = 0;
private int id = ID++;
private static final Color[] COLORS = {Color.RED, Color.BLUE, Color.YELLOW, Color.ORANGE, Color.MAGENTA, Color.GREEN, Color.PINK, Color.WHITE, Color.DARK_GRAY, Color.CYAN};
public SignalPanel() {
setBackground(COLORS[(int) (COLORS.length * Math.random())]);
setMinimumSize(new Dimension(50, 50));
setPreferredSize(new Dimension(50, 50));
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.BLACK);
g.drawString(String.valueOf(id), 10, 10);
}
}
private SignalPanel selectedPanel;
private class DnDMouseListener extends MouseInputAdapter {
MouseEvent firstMouseEvent = null;
public void mousePressed(MouseEvent e) {
//Don't bother to drag if there is no sub-component.
if (getComponentCount() == 0) {
return;
}
Component component = getComponentAt(e.getX(), e.getY());
if (!(component instanceof SignalPanel)) {
return;
}
selectedPanel = (SignalPanel) component;
System.out.println("Mouse pressed");
firstMouseEvent = e;
e.consume();
}
public void mouseDragged(MouseEvent e) {
//Don't bother to drag if there is no sub-component.
if (getComponentCount() == 0) {
return;
}
System.out.println("Mouse dragged");
if (firstMouseEvent != null) {
e.consume();
//If they are holding down the control key, COPY rather than MOVE
int ctrlMask = InputEvent.CTRL_DOWN_MASK;
int action = ((e.getModifiersEx() & ctrlMask) == ctrlMask) ? TransferHandler.COPY : TransferHandler.MOVE;
int dx = Math.abs(e.getX() - firstMouseEvent.getX());
int dy = Math.abs(e.getY() - firstMouseEvent.getY());
//Arbitrarily define a 5-pixel shift as the
//official beginning of a drag.
if (dx > 5 || dy > 5) {
//This is a drag, not a click.
JComponent c = (JComponent) e.getSource();
//Tell the transfer handler to initiate the drag.
TransferHandler handler = c.getTransferHandler();
handler.exportAsDrag(c, firstMouseEvent, action);
firstMouseEvent = null;
}
}
}
public void mouseReleased(MouseEvent e) {
System.out.println("Mouse released");
firstMouseEvent = null;
}
}
private static class DnDHandler extends TransferHandler {
private DataFlavor signalFlavor = new DataFlavor(SignalPanel.class, "Draggable signal renderer");
private TestDnDContainer sourcePanel;
boolean shouldRemove;
/** This is called in the transfert handler of the receiver.
*/
public boolean importData(JComponent c, Transferable t) {
SignalPanel signalPanel;
if (canImport(c, t.getTransferDataFlavors())) {
TestDnDContainer targetPanel = (TestDnDContainer) c;
//Don't drop on myself.
if (sourcePanel == targetPanel) {
shouldRemove = false;
return true;
}
try {
signalPanel = (SignalPanel) t.getTransferData(signalFlavor);
if (sourcePanel == null) {
}
targetPanel.add(signalPanel);
targetPanel.revalidate();
targetPanel.repaint();
for (int i = 0; i < targetPanel.getComponentCount(); i++) {
System.out.print(((SignalPanel) targetPanel.getComponent(i)).id + "\t");
}
System.out.println();
return true;
}
catch (UnsupportedFlavorException ufe) {
System.out.println("importData: unsupported data flavor");
}
catch (IOException ioe) {
System.out.println("importData: I/O exception");
}
catch (Throwable th) {
th.printStackTrace();
}
}
return false;
}
protected Transferable createTransferable(JComponent c) {
sourcePanel = (TestDnDContainer) c;
SignalPanel signalPanel = sourcePanel.selectedPanel;
shouldRemove = true;
return new SignalTransferable(signalPanel);
}
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
}
/** This is called in the transfert handler of the sender.
*/
protected void exportDone(JComponent c, Transferable data, int action) {
if (shouldRemove && (action == MOVE)) {
sourcePanel.remove(sourcePanel.selectedPanel);
sourcePanel.revalidate();
sourcePanel.repaint();
sourcePanel.selectedPanel = null;
for (int i = 0; i < sourcePanel.getComponentCount(); i++) {
System.out.print(((SignalPanel) sourcePanel.getComponent(i)).id + "\t");
}
System.out.println();
}
sourcePanel = null;
}
public boolean canImport(JComponent c, DataFlavor[] flavors) {
for (int i = 0; i < flavors.length; i++) {
if (signalFlavor.equals(flavors[i])) {
return true;
}
}
return false;
}
public Icon getVisualRepresentation(Transferable t) {
System.out.println("Creating visual representation");
SignalTransferable st = (SignalTransferable) t;
BufferedImage image = new BufferedImage(st.sourceSignalPanel.getWidth(), st.sourceSignalPanel.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics graphics = image.createGraphics();
st.sourceSignalPanel.paint(graphics);
graphics.dispose();
return new ImageIcon(image);
}
class SignalTransferable implements Transferable {
private SignalPanel sourceSignalPanel;
SignalTransferable(SignalPanel sourceSignalPanel) {
this.sourceSignalPanel = sourceSignalPanel;
}
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
}
return sourceSignalPanel;
}
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] {signalFlavor};
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return signalFlavor.equals(flavor);
}
}
}
} |
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