how to drag my component and place it anywhere on the panel
i make a dragable component :
//class: DragAbleComponent.the father of my component
import java.awt.Graphics;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.accessibility.Accessible;
import javax.swing.JComponent;
public abstract class DragAbleComponent extends JComponent implements
MouseListener,
FocusListener, Accessible ,MouseMotionListener{
private int X;
private int Y;
/**
*
*/
private static final long serialVersionUID = 1L;
public void mouseClicked(MouseEvent e) {
this.requestFocusInWindow();
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void focusGained(FocusEvent e) {
this.repaint();}
public void focusLost(FocusEvent e) {
this.repaint();}
protected abstract void paintComponent(Graphics graphics);
public int getX() {
return X;
}
public void setX(int x) {
X = x;
}
public int getY() {
return Y;
}
public void setY(int y) {
Y = y;
}
}
//class:DragableIcon the component
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.KeyStroke;
import javax.swing.TransferHandler;
public class DragableIcon extends DragAbleComponent {
private Image image;
private MouseEvent firstMouseEvent = null;
private static boolean installKeyBordMapings = true;
/**
*
*/
private static final long serialVersionUID = 1L;
public DragableIcon(Image image) {
super();
this.image = image;
this.setFocusable(true);
this.addMouseListener(this);
this.addFocusListener(this);
this.addMouseMotionListener(this);
this.initKeyBordMaping();
}
private void initKeyBordMaping(){
if (installKeyBordMapings) {
InputMap imap = this.getInputMap();
// imap.put(KeyStroke.getKeyStroke("ctrl X"),
// TransferHandler.getCutAction().getValue(Action.NAME));
imap.put(KeyStroke.getKeyStroke("ctrl C"),
TransferHandler.getCopyAction().getValue(Action.NAME));
imap.put(KeyStroke.getKeyStroke("ctrl V"),
TransferHandler.getPasteAction().getValue(Action.NAME));
}
ActionMap map = this.getActionMap();
// map.put(TransferHandler.getCutAction().getValue(Action.NAME),
// TransferHandler.getCutAction());
map.put(TransferHandler.getCopyAction().getValue(Action.NAME),
TransferHandler.getCopyAction());
map.put(TransferHandler.getPasteAction().getValue(Action.NAME),
TransferHandler.getPasteAction());
}
@Override
protected void paintComponent(Graphics graphics) {
Graphics g = graphics.create();
//Draw in our entire space, even if isOpaque is false.
g.setColor(Color.WHITE);
g.fillRect(0, 0, image == null ? 125 : image.getWidth(this),
image == null ? 125 : image.getHeight(this));
if (image != null) {
//Draw image at its natural size of 125x125.
g.drawImage(image, 0, 0, this);
}
//Add a border, red if picture currently has focus
if (isFocusOwner()) {
g.setColor(Color.RED);
} else {
g.setColor(Color.BLACK);
}
g.drawRect(0, 0, image == null ? 125 : image.getWidth(this),
image == null ? 125 : image.getHeight(this));
// g.drawImage(image, 0, 0, this);
g.dispose();
}
public void mouseDragged(MouseEvent e) {
//Don't bother to drag if the component displays no image.
if (image == null) return;
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();
TransferHandler handler = c.getTransferHandler();
//Tell the transfer handler to initiate the drag.
handler.exportAsDrag(c, firstMouseEvent, action);
firstMouseEvent = null;
}
}
}
public void mouseMoved(MouseEvent e) {}
public void mousePressed(MouseEvent e) {
//Don't bother to drag if there is no image.
if (image == null) return;
firstMouseEvent = e;
e.consume();
}
public void mouseReleased(MouseEvent e) {
firstMouseEvent = null;
}
public static boolean isInstallKeyBordMapings() {
return installKeyBordMapings;
}
public static void setInstallKeyBordMapings(boolean
installKeyBordMapings) {
DragableIcon.installKeyBordMapings = installKeyBordMapings;
}
public Image getImage() {
return image;
}
public void setImage(Image image) {
this.image = image;
}
}
//here is my handler
import java.awt.Image;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import javax.swing.JComponent;
import javax.swing.TransferHandler;
import cn.com.ynld.bms.applet.gui.component.DragableIcon;
;
public class IconTransferHandler extends TransferHandler {
/**
*
*/
private static final long serialVersionUID = 1L;
DataFlavor pictureFlavor = DataFlavor.imageFlavor;
DragableIcon sourceIcon;
boolean shouldRemove;
public boolean importData(JComponent c, Transferable t) {
System.out.println("begin to import image----->");
Image image;
if (canImport(c, t.getTransferDataFlavors())) {
DragableIcon icon = (DragableIcon)c;
//Don't drop on myself.
if (sourceIcon == icon) {
shouldRemove = false;
return true;
}
try {
image = (Image)t.getTransferData(pictureFlavor);
//Set the component to the new picture.
icon.setImage(image);
return true;
} catch (UnsupportedFlavorException ufe) {
System.out.println("importData: unsupported data
flavor");
} catch (IOException ioe) {
System.out.println("importData: I/O exception");
}
}
return false;
}
protected Transferable createTransferable(JComponent c) {
sourceIcon = (DragableIcon)c;
shouldRemove = true;
return new IconTransferable(sourceIcon);
}
public int getSourceActions(JComponent c) {
return COPY;
}
protected void exportDone(JComponent c, Transferable data, int
action) {
// if (shouldRemove && (action == MOVE)) {
// sourceIcon.setImage(null);
// }
// sourceIcon = null;
}
public boolean canImport(JComponent c, DataFlavor[] flavors) {
// for (int i = 0; i < flavors.length; i++) {
// if (pictureFlavor.equals(flavors[i])) {
// return true;
// }
// }
return true;
}
class IconTransferable implements Transferable {
private Image image;
IconTransferable(DragableIcon icon) {
image = icon.getImage();
}
public Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
}
return image;
}
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] { pictureFlavor };
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return pictureFlavor.equals(flavor);
}
}
}
i add a handler to my DragableIcon and pane both(copy DragableIcon to
my pane);
the draging seem worked(drag icon) but place dose't (he even did't
invoke the method importData) )
what' can i do?
thanks for any help!