JavaFX：can控制器可以是一个抽象类？ [英] JavaFX: can controller be an abstract class?

问题描述

我一直在这部分代码工作一天，只是不知道为什么它总是生成错误。

I have been working on this part of code for a day and just can't figure out why it always generates error.

我有一个控制器和FXML。他们工作完美。然后，我想到我想重用这个特定的控制器与抽象updateSelect（）函数。因此，我将控制器更改为抽象。

I have a controller and FXML. They worked perfectly. Then it came to my mind that I want to reuse this particular controller with a abstract updateSelect() function. Therefore, I change the controller to abstract.

代码编译得很好。直到我尝试运行这部分代码。

The code compiled just fine. Until I try to run this part of code.

@FXML
private void mnuProjMember_onClick(ActionEvent event) {
    mainContent.getChildren().clear();
    FXMLLoader loader = new      FXMLLoader(getClass().getResource("PaneProjectSearch.fxml"));

    PaneProjectSearchController controller = new PaneProjectSearchController(){
        @Override
        void updateSelect(){
            System.out.println("update: !!");
        }
    };

    loader.setController(controller);
    controller.setParent(mainContent);
    fitToParent(loader);
}

它给了我以下错误信息。嗯...这是没有意义的，因为代码将再次正常工作后，我删除了抽象部分，甚至没有接触FXML或其他函数。

It gives me following error message. Well...it's non-sense because the code will work fine again after I remove the abstract parts without even touching the FXML or other functions.

错误解决onAction = #btnAdd_onClick'，则事件处理程序不在命名空间中，或脚本中有错误。
file：/ D：/NetBeansWork/ProjCostTracking/dist/run1210215635/ProjCostTracking.jar！/ProjCostTracking/PaneProjectSearch.fxml：20

Error resolving onAction='#btnAdd_onClick', either the event handler is not in the Namespace or there is an error in the script. file:/D:/NetBeansWork/ProjCostTracking/dist/run1210215635/ProjCostTracking.jar!/ProjCostTracking/PaneProjectSearch.fxml:20

任何指导和建议欢迎，谢谢：）

Any guidance and advise is welcomed, thanks :)

推荐答案

我猜你在抽象控制器类中有一个私有处理程序方法。为了使这个工作，我认为处理程序方法，以及任何@ FXML注释字段，需要直接访问子类（即public或protected，或默认可见性，如果子类是在同一个包中的抽象控制器）。

I'm guessing that you have a private handler method in the abstract controller class. To make this work, I think the handler methods, as well as any @FXML-annotated fields, need to be directly accessible by the subclass (i.e. public or protected, or default visibility if the subclass is in the same package as the abstract controller).

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