Making a Component Draggable
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSource;
import java.awt.dnd.DragSourceDragEvent;
import java.awt.dnd.DragSourceDropEvent;
import java.awt.dnd.DragSourceEvent;
import java.awt.dnd.DragSourceListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class Main {
public static void main(String[] argv) throws Exception {
JComponent com = new DraggableComponent();
JFrame f = new JFrame();
f.add(com);
f.setSize(300, 300);
f.setVisible(true);
}
}
class DraggableComponent extends JComponent implements DragGestureListener, DragSourceListener {
DragSource dragSource;
public DraggableComponent() {
dragSource = new DragSource();
dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY_OR_MOVE, this);
}
public void dragGestureRecognized(DragGestureEvent evt) {
Transferable t = new StringSelection("aString");
dragSource.startDrag(evt, DragSource.DefaultCopyDrop, t, this);
}
public void dragEnter(DragSourceDragEvent evt) {
System.out.println("enters");
}
public void dragOver(DragSourceDragEvent evt) {
System.out.println("over");
}
public void dragExit(DragSourceEvent evt) {
System.out.println("leaves");
}
public void dropActionChanged(DragSourceDragEvent evt) {
System.out.println("changes the drag action between copy or move");
}
public void dragDropEnd(DragSourceDropEvent evt) {
System.out.println("finishes or cancels the drag operation");
}
}
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