Question

我想用线连接2个形状，同时按下鼠标。正如doc所说，我不能使用按下拖动释放模型这样做，所以应该使用拖放方法 - 一切看起来都不错，但是如何禁用默认图标，这表示拖放内容可以放在目标上？在mouseMove上画线，我不想要这些默认图标。

我包含显示它的简单程序 - 只需运行我尝试将一个圆拖到另一个。

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package onreleased;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.*;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

/**
*
* @author mmk
*/
public class DaDIcons extends Application {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");


        final Label label = new Label("started");
        label.setLayoutY(100);

        Pane pane = new Pane();
        Circle red = createCircle(40, 40, 30, Color.RED, label);
        Circle blue = createCircle(160, 40, 30, Color.BLUE, label);

        pane.setOnDragOver(new EventHandler<DragEvent>() {

            @Override
            public void handle(DragEvent event) {

                System.out.println("foo");

            }
        });

        pane.getChildren().addAll(red, blue, label);

        primaryStage.setScene(new Scene(pane, 300, 250));
        primaryStage.show();
    }

    private Circle createCircle(double x, double y, double r, final Color color, final Label statusLabel) {

        final Circle circle = new Circle(x, y, r);
        circle.setFill(color);

        circle.setOnDragOver(new EventHandler<DragEvent>() {

            @Override
            public void handle(DragEvent event) {
                statusLabel.setText(color.toString() + " over");
                System.out.println("foo");
                if (event.getGestureSource() != circle) {


                    event.acceptTransferModes(TransferMode.ANY);
                }
            }
        });

        circle.setOnDragDropped(new EventHandler<DragEvent>() {

            @Override
            public void handle(DragEvent arg0) {
                statusLabel.setText(color.toString() + " dropped");
            }
        });

        circle.setOnDragDetected(new EventHandler<MouseEvent>() {

            @Override
            public void handle(MouseEvent arg0) {
                circle.startDragAndDrop(TransferMode.ANY);
                Dragboard db = circle.startDragAndDrop(TransferMode.ANY);

                /*
                * Put a string on a dragboard
                */
                ClipboardContent content = new ClipboardContent();
                content.putString("foo");
                db.setContent(content);


                statusLabel.setText(color.toString() + " xxxxxxxxxxxxxxxxxxxxxxx");
            }
        });

        circle.setOnDragEntered(null);

        return circle;

    }
}

Answer 1

您可以在拖放操作中管理Cursor 在circle.setOnDragDetected()操作集circle.setCursor(Cursor.NONE);和，
在circle.setOnDragDropped()操作上将其反转circle.setCursor(Cursor.DEFAULT); 无需显示光标图标，您可以在d-n-drop时在鼠标坐标处显示图像。

javafx拖放默认图标

1 个答案: