当父节点发生变形时拖动节点会导致节点消失

Question

非常奇怪的问题，我最终设法将它提取成一小段代码来演示问题。我有一个窗格，其中包含1组，该组包含一个包含一些省略号的组。顶部组有一个应用于它的旋转变换。椭圆形是可拖动的。

尝试下面的示例，向下拖动一些省略号（在组的边界外），您将看到它们消失。如果你最大化窗口，他们再次出现，但你不能拖动他们，他们不再收到任何事件。

现在的真是奇怪的一部分，有三种方式，我可以让问题消失：（！？）

1. 不适用变换
2. 删除一个椭圆（我尝试让这个数字，11）
3. 开始ScenicView一起和选择包含椭圆组，所以你可以看到该组的边界

我在这里一败涂地，完全愣住了。请问，有没有人知道为什么会出现这个问题，以及如何解决它？

代码（JavaFX的2.2.3和Java 1.7.0_09 64位Windows 7）：

import javafx.application.Application; 
import javafx.event.EventHandler; 
import javafx.geometry.Point2D; 
import javafx.scene.Group; 
import javafx.scene.GroupBuilder; 
import javafx.scene.Node; 
import javafx.scene.Scene; 
import javafx.scene.SceneBuilder; 
import javafx.scene.input.MouseEvent; 
import javafx.scene.layout.Pane; 
import javafx.scene.shape.Ellipse; 
import javafx.scene.shape.EllipseBuilder; 
import javafx.scene.transform.Rotate; 
import javafx.scene.transform.RotateBuilder; 
import javafx.stage.Stage; 

public class DragProblem extends Application { 
public static void main(String[] args) { 
    launch(args); 
} 

@Override 
public void start(Stage primaryStage) { 
    DrawingPane drawingPane = new DrawingPane(); 
    drawingPane.setStyle("-fx-background-color: darkgrey;"); 

    Scene scene = SceneBuilder.create().root(drawingPane).width(1280d).height(1024d).build(); 

    primaryStage.setScene(scene); 
    primaryStage.show(); 
} 

public class DrawingPane extends Pane { 
    private Group transformedGroup; 
    private Group splinePoints; 

    public DrawingPane() { 
     transformedGroup = GroupBuilder.create().id("transformedGroup").build(); 

     getChildren().add(transformedGroup); 

     addPoints(); 
     makePointsDraggable(); 
    } 

    public void addPoints() { 
     double[] coords = new double[] { 
       // comment any one the below x,y coordinates and the problem doesn't occur.. 
       239.28353881835938, 488.2192687988281, 
       245.04466247558594, 505.30169677734375, 
       258.56671142578125, 539.49462890625, 
       267.2294006347656, 563.618408203125, 
       282.89141845703125, 587.84033203125, 
       309.6925048828125, 602.2174072265625, 
       327.4945068359375, 616.4683227539062, 
       345.25445556640625, 633.718994140625, 
       371.0416259765625, 649.0819702148438, 
       393.78704833984375, 667.402587890625, 
       442.67010498046875, 676.0886840820312 }; 

     splinePoints = GroupBuilder.create().build(); 
     for (int i = 0; i < coords.length; i += 2) { 
      Ellipse ellipse = EllipseBuilder.create().radiusX(3).radiusY(3).centerX(coords[i]).centerY(coords[i + 1]).build(); 
      splinePoints.getChildren().add(ellipse); 
     } 

     transformedGroup.getChildren().add(splinePoints); 

     Rotate rotateTransform = RotateBuilder.create().build(); 
     rotateTransform.setPivotX(224); 
     rotateTransform.setPivotY(437); 
     rotateTransform.setAngle(15); 

     // ..or comment this line to prevent the problem occuring 
     transformedGroup.getTransforms().add(rotateTransform); 
    } 

    public void makePointsDraggable() { 
     for (final Node n : splinePoints.getChildren()) { 
      Ellipse e = (Ellipse) n; 
      final NodeDragHandler ellipseDragHandler = new NodeDragHandler(e, transformedGroup); 

      e.setOnMousePressed(ellipseDragHandler); 
      e.setOnMouseDragged(ellipseDragHandler); 
     } 
    } 
} 

public class NodeDragHandler implements EventHandler<MouseEvent> { 
    protected final Ellipse node; 
    private final Node transformedGroup; 

    private double initialX; 
    private double initialY; 
    private Point2D initial; 
    private boolean dragStarted = false; 

    public NodeDragHandler(Ellipse node, Group transformedGroup) { 
     this.node = node; 
     this.transformedGroup = transformedGroup; 
    } 

    @Override 
    public void handle(MouseEvent event) { 
     if (!dragStarted) { 
      initialX = event.getScreenX(); 
      initialY = event.getScreenY(); 

      initial = transformedGroup.localToParent(new Point2D(node.getCenterX(), node.getCenterY())); 

      dragStarted = true; 
     } else { 
      double xDragged = event.getScreenX() - initialX; 
      double yDragged = event.getScreenY() - initialY; 

      Point2D newPos = new Point2D(initial.getX() + xDragged, initial.getY() + yDragged); 

      Point2D p = transformedGroup.parentToLocal(newPos.getX(), newPos.getY()); 

      node.setCenterX(p.getX()); 
      node.setCenterY(p.getY()); 
     } 
    } 
} 
} 

Answer 1

它被公认为JavaFX的一个错误，将在2.2.6解决了，看到here。我已经用早期的访问版本进行了测试，我可以确认它已经解决了。