java - 在 Javafx 中拖动按钮

Question

我有一个按钮，我想拖动它并在一段时间后将其放下。 我在网上搜索了我遇到的最有用的东西是this关联。 与提供的链接类似，我希望将按钮拖动到光标所在的任何位置，只有当鼠标按钮向上时，按钮才应该放下。 这个问题如何解决？提前致谢

Answer 1

我设法制作了一个 borderPane 并在其上放置了一个按钮。当您释放鼠标时，按钮会被拖动并释放!

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class ButtonDraggable extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        BorderPane borderPane = new BorderPane();
        borderPane.setPrefSize(800, 600);
        final Button button = new Button("Drag ME !");

        final Delta dragDelta = new Delta();
        button.setOnMousePressed(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {
                // record a delta distance for the drag and drop operation.
                dragDelta.x = button.getLayoutX() - mouseEvent.getSceneX();
                dragDelta.y = button.getLayoutY() - mouseEvent.getSceneY();
                button.setCursor(Cursor.MOVE);
            }
        });
        button.setOnMouseReleased(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {
                button.setCursor(Cursor.HAND);
            }
        });
        button.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {
                button.setLayoutX(mouseEvent.getSceneX() + dragDelta.x);
                button.setLayoutY(mouseEvent.getSceneY() + dragDelta.y);
            }
        });
        button.setOnMouseEntered(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {
                button.setCursor(Cursor.HAND);
            }
        });

        borderPane.setCenter(button);

        Scene scene = new Scene(borderPane);

        stage.setScene(scene);
        stage.show();

    }

    // records relative x and y co-ordinates.
    class Delta {
        double x, y;
    }

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

}

如有任何疑问，请随时发表评论!

-AA