e641. 使一个组件成为拖放目标
public class DropTargetComponent extends JComponent implements DropTargetListener { public DropTargetComponent() { new DropTarget(this, this); } public void dragEnter(DropTargetDragEvent evt) { // Called when the user is dragging and enters this drop target. } public void dragOver(DropTargetDragEvent evt) { // Called when the user is dragging and moves over this drop target. } public void dragExit(DropTargetEvent evt) { // Called when the user is dragging and leaves this drop target. } public void dropActionChanged(DropTargetDragEvent evt) { // Called when the user changes the drag action between copy or move. } public void drop(DropTargetDropEvent evt) { // Called when the user finishes or cancels the drag operation. } }
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