public DragLabel(String s) {
this.setText(s);
this.setOpaque(true);
this.dragSource = DragSource.getDefaultDragSource();
this.dgListener = new DGListener();
this.dsListener = new DSListener();
// component, action, listener
this.dragSource.createDefaultDragGestureRecognizer(this, this.dragAction, this.dgListener);
}
public DragLabel(String s, int a) {
if (a != DnDConstants.ACTION_NONE
&& a != DnDConstants.ACTION_COPY
&& a != DnDConstants.ACTION_MOVE
&& a != DnDConstants.ACTION_COPY_OR_MOVE
&& a != DnDConstants.ACTION_LINK) throw new IllegalArgumentException("action" + a);
this.dragAction = a;
this.setText(s);
this.setOpaque(true);
this.dragSource = DragSource.getDefaultDragSource();
this.dgListener = new DGListener();
this.dsListener = new DSListener();
// component, action, listener
this.dragSource.createDefaultDragGestureRecognizer(this, this.dragAction, this.dgListener);
}
public void init() {
DragSource dragSource = DragSource.getDefaultDragSource();
// 将srcLabel转换成拖放源，它能接受复制、移动两种操作
dragSource.createDefaultDragGestureRecognizer(
srcLabel,
DnDConstants.ACTION_COPY_OR_MOVE,
new DragGestureListener() {
public void dragGestureRecognized(DragGestureEvent event) {
// 将JLabel里的文本信息包装成Transferable对象
String txt = srcLabel.getText();
Transferable transferable = new StringSelection(txt);
// 继续拖放操作,拖放过程中使用手状光标
event.startDrag(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR), transferable);
}
});
jf.add(new JScrollPane(srcLabel));
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.pack();
jf.setVisible(true);
}