JavaFX将按钮从一个窗格拖到另一个窗格

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.input.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class DragAndDropExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        // 创建源窗格和目标窗格
        VBox sourcePane = new VBox();
        HBox targetPane = new HBox();

        // 创建按钮并添加到源窗格
        Button button = new Button("拖放按钮");
        sourcePane.getChildren().add(button);

        // 设置按钮为可拖动
        button.setOnDragDetected(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent event) {
                Dragboard db = button.startDragAndDrop(TransferMode.MOVE);
                ClipboardContent content = new ClipboardContent();
                content.putString(button.getText());
                db.setContent(content);
                event.consume();
            }
        });

        // 设置目标窗格的拖放事件处理程序
        targetPane.setOnDragOver(new EventHandler<DragEvent>() {
            public void handle(DragEvent event) {
                if (event.getGestureSource() != targetPane && event.getDragboard().hasString()) {
                    event.acceptTransferModes(TransferMode.MOVE);
                }
                event.consume();
            }
        });

        targetPane.setOnDragDropped(new EventHandler<DragEvent>() {
            public void handle(DragEvent event) {
                Dragboard db = event.getDragboard();
                boolean success = false;
                if (db.hasString()) {
                    Button droppedButton = new Button(db.getString());
                    targetPane.getChildren().add(droppedButton);
                    success = true;
                }
                event.setDropCompleted(success);
                event.consume();
            }
        });

        // 创建场景并显示窗口
        Scene scene = new Scene(new VBox(sourcePane, targetPane), 300, 200);
        primaryStage.setScene(scene);
        primaryStage.setTitle("拖放示例");
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}