JavaFx 阻止子级为父级触发 setOnMouseEntered

Question

一个非常简单的问题，我希望有一个简单的答案。

我有一个有点复杂的自定义节点，它扩展了一个组。

当孩子悬停时，如何防止 JavaFx 为 Group 触发 setOnMouseEntered 事件？

setMouseTransparenthackery 似乎无法解决问题。

Answer 1

我做了一个简单的测试应用，组没有得到鼠标事件：

private static final class Foo extends Group {
    Foo() {
        final Rectangle blue = new Rectangle(100, 100, Color.BLUE);
        blue.setLayoutX(50);
        blue.setLayoutY(50);
        blue.setOnMouseEntered(e -> System.out.println("Entered blue"));

        final Rectangle green = new Rectangle(100, 100, Color.GREEN);
        green.setLayoutX(250);
        green.setLayoutY(90);
        green.setOnMouseEntered(e -> System.out.println("Entered green"));

        final Rectangle red = new Rectangle(100, 100, Color.RED);
        red.setLayoutX(100);
        red.setLayoutY(200);
        red.setOnMouseEntered(e -> System.out.println("Entered red"));

        getChildren().addAll(blue, green, red);
    }
}

@Override
public void start(final Stage primaryStage) throws Exception {
    final Pane root = new AnchorPane();
    final Foo foo = new Foo();
    root.getChildren().add(foo);
    final Scene scene = new Scene(root);
    primaryStage.setScene(scene);
    primaryStage.show();
}

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

这是因为它执行了鼠标拾取：

Node#contains 实现为

public boolean contains(double localX, double localY) {
    if (containsBounds(localX, localY)) {
        return (isPickOnBounds() || impl_computeContains(localX, localY));
    }
    return false;
}

impl_computeContains 定义在父类中，它是 Group 的超类

protected boolean impl_computeContains(double localX, double localY) {
    final Point2D tempPt = TempState.getInstance().point;
    for (int i=0, max=children.size(); i<max; i++) {
        final Node node = children.get(i);
        tempPt.x = (float)localX;
        tempPt.y = (float)localY;
        try {
            node.parentToLocal(tempPt);
        } catch (NoninvertibleTransformException e) {
            continue;
        }
        if (node.contains(tempPt.x, tempPt.y)) {
            return true;
        }
    }
    return false;
}