如何从子控制器访问父成员控制器 [英] How to access parent member controller from child controller

问题描述

此问题类似于这个，但我需要访问父成员（不是控制）。我不知道是否可以不使用依赖注入。

This question is similar to this, but I need to access parent member (not control). I don't know if is possible to do without using Dependency Injection.

例如，我有一个Parent，有一个成员调用User，我需要从子进程控制器到用户。

For example, I have a Parent with have a member calls User, I need to access from child controller to User.

推荐答案

只需将父控制器的引用传递给父控制器的 initialize（）方法：

Just pass the reference from the parent controller to the child controller in the parent controller's initialize() method:

ParentController.java：

ParentController.java:

public class ParentController {

    @FXML
    private ChildController childController ;

    private User user ;

    public void initialize() {
        user = ...;
        childController.setUser(user);
    }
}

ChildController.java：

ChildController.java:

public class ChildController {

    private User user ;

    public void setUser(User user) {
        this.user = user ;
    }
}

您也可以使用JavaFX Properties对象，如果你想绑定等：

You can also do this with JavaFX Properties instead of plain objects, if you want binding etc:

ParentController.java：

ParentController.java:

public class ParentController {

    @FXML
    private ChildController childController ;

    private final ObjectProperty<User> user = new SimpleObjectProperty<>(...) ;

    public void initialize() {
        user.set(...);
        childController.userProperty().bind(user);
    }
}

ChildController.java：

ChildController.java:

public class ChildController {

    private ObjectProperty<User> user = new SimpleObjectProperty<>();

    public ObjectProperty<User> userProperty() {
        return user ;
    }
}

像往常一样，父fxml文件需要设置在 fx：include 标签上的 fx：id ，以便将加载的控制器注入

As usual, the parent fxml file needs to set the fx:id on the fx:include tag so that the loaded controller is injected to the

<fx:include source="/path/to/child/fxml" fx:id="child" />

规则是 fx：id =x，来自子fxml的控制器将注入到名为 xController 的父控制器字段中。

the rule being that with fx:id="x", the controller from the child fxml will be injected into a parent controller field with name xController.

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