JAVA DRAG 가능한 Component 만들기
class DraggableComponent extends JComponent
{
/** If sets <b>TRUE</b> this component is draggable */
private boolean draggable = true;
/**
* 2D Point representing the coordinate where mouse is, relative parent
* container
*/
protected Point anchorPoint;
/** Default mouse cursor for dragging action */
protected Cursor draggingCursor = Cursor
.getPredefinedCursor(Cursor.HAND_CURSOR);
/**
* If sets <b>TRUE</b> when dragging component, it will be painted over each
* other (z-Buffer change)
*/
protected boolean overbearing = false;
public DraggableComponent()
{
addDragListeners();
setOpaque(true);
setBackground(new Color(240, 240, 240));
}
/**
* Add Mouse Motion Listener with drag function
*/
private void addDragListeners()
{
/**
* This handle is a reference to THIS because in next Mouse Adapter
* "this" is not allowed
*/
final DraggableComponent handle = this;
addMouseMotionListener(new MouseAdapter()
{
@Override
public void mouseMoved(MouseEvent e)
{
anchorPoint = e.getPoint();
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
}
@Override
public void mouseDragged(MouseEvent e)
{
int anchorX = anchorPoint.x;
int anchorY = anchorPoint.y;
Point parentOnScreen = getParent().getLocationOnScreen();
Point mouseOnScreen = e.getLocationOnScreen();
Point position = new Point(mouseOnScreen.x - parentOnScreen.x
- anchorX, mouseOnScreen.y - parentOnScreen.y - anchorY);
setLocation(position);
// Change Z-Buffer if it is "overbearing"
if (overbearing)
{
getParent().setComponentZOrder(handle, 0);
repaint();
}
}
});
}
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
if (isOpaque())
{
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
}
}
private void removeDragListeners()
{
for (MouseMotionListener listener : this.getMouseMotionListeners())
{
removeMouseMotionListener(listener);
}
setCursor(Cursor.getDefaultCursor());
}
}
http://www.codeproject.com/Articles/116088/Draggable-Components-in-Java-Swing