6

非常奇怪的问题，我终于设法将其提炼成一小段代码来演示该问题。我有一个窗格，其中包含 1 个组，该组包含一个包含一些省略号的组。顶部组应用了旋转变换。椭圆是可拖动的。

试试下面的例子，向下拖动一些椭圆（在组的范围之外），你会看到它们消失了。如果您最大化窗口，它们会再次出现，但您不能再拖动它们，它们不再接收任何事件。

现在对于真正奇怪的部分，我可以通过三种方法解决问题：

  1. 不要应用变换
  2. 删除一个椭圆（！？）（我尝试得到这个数字，11）
  3. 在旁边启动 ScenicView并选择包含椭圆的组，这样您就可以看到该组的边界

我在这里完全不知所措，完全惊呆了。请问，有谁知道为什么会出现这个问题以及如何解决它？

代码（JavaFX 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());
        }
    }
}
}
4

1 回答 1

1

它已被确认为 JavaFX 中的一个错误，将在 2.2.6 中解决，请参见此处。我已经使用早期访问版本对其进行了测试，我可以确认它已经解决。

于 2013-01-07T15:46:42.113 回答