如何在FXML中将节点添加到另一个节点的子节点？ [英] How to add node to another node's child in FXML?

问题描述

我想要获得的示例，用Java代码编写：

Example of what I'd like to get, written in Java code:

public class Main extends Application {

    private static Scene scene;

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

    @Override
    public void init() throws IOException {
        // Load root pane from FXML file.
        URL url = getClass().getResource("sample.fxml");
        StackPane root = FXMLLoader.load(url);
        // Create scene for a root node on JavaFX thread.
        Platform.runLater(() -> scene = new Scene(root, 600, 400));
    }

    @Override
    public void start(Stage stage) {
        stage.setScene(scene);
        stage.show();
    }

}

自定义节点：

public class CustomGroup extends Group {

    private VBox contentPane = new VBox();

    public CustomGroup() {
        getChildren().add(contentPane);
        contentPane.getChildren().add(new Label("First Label"));
        contentPane.getChildren().add(new Label("Second Label"));
    }

}

FXML：

<StackPane>
    <CustomGroup/>
</StackPane>

上面的代码是我想要的例子，但不是在Java中添加标签代码，我想在FXML中添加它们。类似的东西：

The code above is example of what I'd like to get, but instead of adding labels in Java code, I want to add them in FXML. Something like that:

<StackPane>
    <CustomGroup>
         <Label text="First Label"/>
         <Label text="Second Label"/>
    </CustomGroup>
</StackPane>

但这会为自定义组添加标签。我想将它们添加到自定义组的内容窗格（VBox）。

but this adds labels to the custom group. I want to add them to the content pane (VBox) of the custom group.

推荐答案

虽然，我不知道你为什么在 CustomGroup 的构造函数中将标签添加到VBox中，我将忽略它并回答您的问题。

Though, I am not sure why you are adding the Labels to your VBox inside the constructor of CustomGroup, I will ignore it and answer your question.

您可以添加单独的方法将项目添加到 VBox 。让我们考虑一下方法：

You can add a separate method to add the items to your VBox. Let us consider the methods:

• setItems（）接受节点将它们添加到VBox


• getItems（），返回来自VBox的ObservableList< Node>

• setItems() which accepts Nodes adds them to the VBox
• getItems() which returns the ObservableList<Node> from the VBox

CustomGroup

public class CustomGroup extends Group {

    private VBox contentPane = new VBox();

    public CustomGroup() {
        getChildren().add(contentPane);
        contentPane.getChildren().add(new Label("First Label"));
        contentPane.getChildren().add(new Label("Second Label"));
    }

    public void setItems(Node...nodes) {
        contentPane.getChildren().addAll(nodes);
    }

    public ObservableList<Node> getItems() {
        return contentPane.getChildren();
    }

}

FXML

<CustomGroup>
  <items>
    <Button text="hi"/>
  </items>
</CustomGroup>

此FXML在 VBox中添加新Button 。

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