什么是“将位置和资源属性自动注入控制器”。在JavaFX中？ [英] What is "automatic injection of location and resources properties into the controller" in JavaFX?

问题描述

在 Initializable <的描述中/ code> 界面据说：

注意此界面已被$ b $自动注入取代b位置和资源属性进入控制器。 FXMLLoader将
现在自动调用由控制器定义的任何适当注释的无参数initialize（）
方法。建议尽可能使用注入
方法。

NOTE This interface has been superseded by automatic injection of location and resources properties into the controller. FXMLLoader will now automatically call any suitably annotated no-arg initialize() method defined by the controller. It is recommended that the injection approach be used whenever possible.

问题是：如何合适注释方法？我只找到一个注释 - @FXML 。还有其他吗？

The question is: how to "suitable annotate" methods? I find only one annotation -- @FXML. Are there any others?

推荐答案

答案是位于此处：

在JavaFX 2.1及更早版本中，
要求控制器类实现Initializable接口，以便在相关FXML文档的内容
已完全加载时得到通知。在JavaFX
2.2中，不再需要这样做。 FXMLLoader类的一个实例只是在控制器上查找initialize（）方法并调用
它（如果可用）。请注意，与其他FXML回调方法
（如事件处理程序）类似，如果该方法不公开，则必须使用@FXML
注释进行注释。

In JavaFX 2.1 and earlier, controller classes were required to implement the Initializable interface to be notified when the contents of the associated FXML document had been completely loaded. In JavaFX 2.2, this is no longer necessary. An instance of the FXMLLoader class simply looks for the initialize() method on the controller and calls it, if available. Note that, similar to other FXML callback methods such as event handlers, this method must be annotated with the @FXML annotation if it is not public.

建议开发人员使用此方法进行新的
开发。 Initializable接口尚未弃用，但
可能在将来的版本中。

It is recommended that developers use this approach for new development. The Initializable interface has not been deprecated, but might be in a future release.

EDIT

经过更多的研究，我现在可以提供一个SSCCE，演示如何将资源包注入带注释的控制器中。请注意，此SSCCE对此SO问题的答案略有修改。

After more research, I can now now provide an SSCCE demonstrating how to inject a resource bundle into a controller with annotations. Please note that this SSCCE contains slight modifications from the answer to this SO question.

这是SSCCE：

com / stackexchange / stackoverflow / _20107463 / MyController.java：

package com.stackexchange.stackoverflow._20107463;

import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.scene.control.Label;

public class MyController {

  @FXML 
  private Label label;

  @FXML private ResourceBundle resources;

  @FXML
  private void initialize() {
    label.setText(resources.getString("key1"));
  }

  // Or if you don't want to use @FXML you could do:
  //public void initialize() {
  //  label.setText(resources.getString("key1"));
  //}
}

com / stackexchange / stackoverflow / _20107463 / MyView.fxml：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.*?>

<BorderPane fx:controller="com.stackexchange.stackoverflow._20107463.MyController" xmlns:fx="http://javafx.com/fxml">
  <top>
    <!-- This label's text will be set by the controller -->
    <Label fx:id="label"/>
  </top>
  <center>
    <!-- This label's text will be taken from the bundle automatically -->
    <Label text="%key2"/>
  </center>
</BorderPane>

com / stackexchange / stackoverflow / _20107463 / BundleDemo.java：

package com.stackexchange.stackoverflow._20107463;

import java.io.IOException;
import java.util.Locale;
import java.util.ResourceBundle;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBoxBuilder;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class BundleDemo extends Application {

  private Stage stage;

  @Override
  public void start(Stage primaryStage) {
    stage = primaryStage;
    Button btnEN = new Button();
    btnEN.setText("English");
    btnEN.setOnAction(new EventHandler<ActionEvent>() {
      @Override public void handle(ActionEvent event) {
        loadView(new Locale("en", "EN"));
      }
    });

    Button btnKG = new Button();
    btnKG.setText("Español");
    btnKG.setOnAction(new EventHandler<ActionEvent>() {
      @Override public void handle(ActionEvent event) {
        loadView(new Locale("es", "ES"));
      }
    });

    VBox root = new VBox(20);
    root.getChildren().add(HBoxBuilder.create().spacing(10).style("-fx-background-color: gray").padding(new Insets(5)).children(btnEN, btnKG).build());
    root.getChildren().add(new StackPane());
    primaryStage.setScene(new Scene(root, 300, 250));
    primaryStage.show();
  }

  private void loadView(Locale locale) {
    try {
      FXMLLoader fxmlLoader = new FXMLLoader();

      fxmlLoader.setResources(ResourceBundle.getBundle("com.stackexchange.stackoverflow.bundles.MyBundle", locale));
      Pane pane = (BorderPane) fxmlLoader.load(this.getClass().getResource("MyView.fxml").openStream());
      // replace the content
      StackPane content = (StackPane) ((VBox) stage.getScene().getRoot()).getChildren().get(1);
      content.getChildren().clear();
      content.getChildren().add(pane);
    } catch (IOException ex) {
      ex.printStackTrace();
    }
  }

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

com / stackexchange / stackoverflow / _20107463 / MyBundle_en.properties：

key1=Name Surname
key2=How are you?

com / stackexchange / stackoverflow / _20107463 / MyBundle_es.properties：

key1=Apellido
key2=Que tal?

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