我是 Javafx 和 Spring 的新手，正在制作一个简单的桌面应用程序来从 database 加载数据并将其显示在 表格 View 。我已将所有代码放在一个类中，该类创建 View 和加载 表并处理添加新行和编辑表。但是我很困惑如何将这个类拆分为 Controller 和 View 部分(像 MVC 模式)。我的类如下所示:
package com.waq;
// some imports
@Component
public class PartsView{
private TableView table;
TextField desc;
Label title;
Button save;
GridPane grid;
@Autowired
private PartService partService;
public PartsView(){
createTable();
grid = new GridPane();
save = new Button();
save.setText("Save");
save.setOnAction((ActionEvent e) -> {
// Some logic
}
}
private void loadData() {
List<Part> parts = partService.findAll();
if(parts.size() > 0) {
ObservableList<Part> observableArrayList = FXCollections.observableArrayList(parts);
table.setItems( observableArrayList);
}
else
table.setPlaceholder(new Label("No data to show."));
}
private void saveData(){
// save record.
}
private void createTable(){
CustomTableColumn<Part,String> idColumn = new CustomTableColumn<Part,String>("id");
idColumn.setPercentWidth(10);
idColumn.setCellValueFactory(new PropertyValueFactory<Part,String>("id"));
CustomTableColumn<Part,String> descCol = new CustomTableColumn<Part,String>("description");
descCol.setPercentWidth(50);
descCol.setCellValueFactory(new PropertyValueFactory<Part,String>("description"));
table.getColumns().addAll(idColumn,descCol);
grid.getChildren().add(table);
}
}
我看到了其他示例，但大多数都是在 fxml 文件中生成 View ，然后使用 @FXML 注释获取 View 对象。但在我的例子中，我在类中创建 View 对象。如果我在 View 类和 Controller 类中分离此类，那么我将如何定义保存按钮的操作以及如何在 Controller 类中访问我的 TableView ？
我们将不胜感激。
最佳答案
如果您创建自定义 JavaFx Node 作为 Bean，您可以将它@Autowired 到 Controller ，但您必须添加一个到 Node 表示您的自定义 Node。
你有两种方式:
扩展您的Node类(或Node的继承者)(看例子)从包含其他节点的类
root-Node返回
例子:
@Component
@Scope("prototype") //If you want to reuse component `@Scope("prototype")`
public class PartsView extends GridPane{
...
public void init(){
getChildren().add(table);
}
}
Controller 应该是这样的:
public class TestController implements Initializable {
@FXML //StackPane as example
private StackPane stackPane; //injecting before constructor, when you load .fxml
@Autowired
private PartsView partsView; //injecting when you load spring-context
@Override
public void initialize(URL location, ResourceBundle resources) {
// initialize fields marked @FXML annotation.
// method initialize triggering after constructor
}
}
主要问题是您必须在Controller 初始化之前将自定义Node 添加到上下文中。可以写Configuration来解决:
@Configuration
@ComponentScan({
"you.node.packege",
})
public class TestConfig{
@Lazy //depends on your case
@Bean
@Scope(BeanDefinition.SCOPE_PROTOTYPE) //depends on your case
public ControlFx<TabPane, PlanningController> testViewFx() throws IOException {
return loadView("/view/TestLayout.fxml");
}
private <V extends Node, C extends Initializable> ControlFx<V,C> loadView(String url) throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource(url));
return new ViewFx<>(loader.load(), loader.getController());
}
}
ControlFx 类:
public class ControlFx<N extends Node ,C extends Initializable> {
private final N view;
private final C controller;
public ControlFx(N view, C controller) {
this.view = view;
this.controller = controller;
}
public N getView() {
return view;
}
public C getController() {
return controller;
}
}
I separate this class in view and controller classes, then how I will define the action lets say for the save button and how I will access my table view in the controller class?
您可以将facade-方法写入您的自定义类:
public void setOnActionSaveButton(EventHandler<ActionEvent> value){
save.setOnAction((ActionEvent e) -> {
// Some logic
}
}
I am generating all the view with code, without any fxml file. In that case how it will work?
将@Controller注解(@Component的扩展)与@PostConstruct注解一起使用，或将@Autowired与构造函数(或任何 init 方式):
@Controller
public class TestController {
private StackPane stackPane;
// @Autowired
private PartsView partsView;
@Autowired
public TestController (PartsView partsView){
...
stackPane.getChildren().add(partsView)
}
// @PostConstruct
// private void beanPostConstruct() {
// stackPane.getChildren().add(partsView);
// }
}
In your 2nd and 3rd code snippet, you mentioned loading fxml file but I dont have any.
你必须首先初始化 spring-context。我使用了 AnnotationConfigApplicationContext:
public abstract class AbstractJavaFxApplication extends Application {
private static String[] savedArgs;
protected AnnotationConfigApplicationContext context;
@Override
public void init() {
context = new AnnotationConfigApplicationContext(configurations());
context.getAutowireCapableBeanFactory().autowireBean(this);
}
@Override
public void stop() throws Exception {
super.stop();
context.close();
}
protected static void launchApp(Class<? extends AbstractJavaFxApplication> clazz, String[] args) {
AbstractJavaFxApplication.savedArgs = args;
Application.launch(clazz, savedArgs);
}
protected abstract Class<?>[] configurations();
}
实现:
public class ReportApp extends AbstractJavaFxApplication {
public final double PRIMARY_WINDOW_HEIGHT = 500;
public final double PRIMARY_WINDOW_WIDTH = 500;
@Value("${ui.title:JavaFX приложение}")
private String windowTitle;
@Autowired
private RootLayoutController controller;
@Override
public void start(Stage stage) throws Exception {
stage.setTitle(windowTitle);
stage.setScene(
new Scene(
controller.getPane(),
PRIMARY_WINDOW_WIDTH,
PRIMARY_WINDOW_HEIGHT
)
);
stage.setResizable(true);
stage.centerOnScreen();
stage.show();
}
public static void main(String[] args) {
launchApp(ReportApp.class, args);
}
@Override
protected Class<?>[] configurations() {
return new Class<?>[]{
Config.class
};
}
}
配置:
@Configuration
@ComponentScan({"components", "controllers"})
public class Config {
@Bean
...
}
Controller :
@Controller
public class RootLayoutController {
private StackPane stackPane;
@Autowired
private PartsView partsView;
@PostConstruct
private void init(){
stackPane = new StackPane();
stackPane.getChildren().add(partsView);
}
public Pane getPane(){
return stackPane;
}
}
关于java - 动态 Javafx View 的 Controller 类，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55077891/