如何从控制器访问 JavaFx Stage？
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How to access a JavaFx Stage from a Controller?
提问by Sargon1
I'm converting a pure JavaFx app, in which the code below worked fine when put all in one class, to a FXML one, where the Stage declaration and the button handler are in separate classes. In the a Controller, I'm trying to implement a method that will allow the user to choose a directory and store it in a variable for later use:
我正在将一个纯 JavaFx 应用程序（其中下面的代码在将所有内容放在一个类中时运行良好）转换为 FXML 应用程序，其中 Stage 声明和按钮处理程序位于不同的类中。在控制器中，我试图实现一种方法，该方法将允许用户选择一个目录并将其存储在变量中以供以后使用：
private File sourceFile;
DirectoryChooser sourceDirectoryChooser;
@FXML
private void handleSourceBrowse() {
sourceDirectoryChooser.setTitle("Choose the source folder");
sourceFile = sourceDirectoryChooser.showDialog(theStage);
}
However, "theStage", a Stage which the method requires, only exists(if that's the right terminology) in FolderSyncer4.java:
但是，该方法需要的舞台“theStage”仅存在于 FolderSyncer4.java 中（如果这是正确的术语）：
public class FolderSyncer4 extends Application {
final String FOLDER_SYNCER = "FolderSyncer";
Stage theStage;
@Override
public void start(Stage primaryStage) throws Exception {
theStage = primaryStage;
//TODO do the FXML stuff, hope this works
Parent root = FXMLLoader.load(getClass().getResource("FolderSyncerMainWindow.fxml"));
theStage.setScene(new Scene(root, 685, 550));
theStage.setTitle(FOLDER_SYNCER);
theStage.show();
}
}
How to I get around this? I need to have that method implemented again somehow, but suddenly I can't pass the stage as an argument.
我该如何解决这个问题？我需要以某种方式再次实现该方法，但突然间我无法将阶段作为参数传递。
采纳答案by Andreas Fester
In your situation, it is probably easiest to get the scene from the ActionEventparameter of your handler:
在您的情况下，从ActionEvent处理程序的参数中获取场景可能是最简单的：
@FXML
private void handleSourceBrowse(ActionEvent ae) {
Node source = (Node) ae.getSource();
Window theStage = source.getScene().getWindow();
sourceDirectoryChooser.showDialog(theStage);
}
See JavaFX: How to get stage from controller during initialization?for some more information. I am not in favor of the highest rated answer though, since it adds a compile time dependency to the controller after the .fxmlfile has been loaded (after all that question was tagged with javafx-2, so not sure if the above approach already worked there, and also the context of the question looks a bit different).
请参阅JavaFX：如何在初始化期间从控制器获取舞台？了解更多信息。不过，我不赞成评分最高的答案，因为它.fxml在加载文件后向控制器添加了编译时依赖性（毕竟该问题被标记为javafx-2，所以不确定上述方法是否已经在那里工作，并且问题的上下文看起来有点不同）。
See also How do I open the JavaFX FileChooser from a controller class?
回答by Jinu P C
Another way is define a static getter for the Stage and Access it
另一种方法是为舞台定义一个静态 getter 并访问它
Main Class
主类
public class Main extends Application {
private static Stage primaryStage; // **Declare static Stage**
private void setPrimaryStage(Stage stage) {
Main.primaryStage = stage;
}
static public Stage getPrimaryStage() {
return Main.primaryStage;
}
@Override
public void start(Stage primaryStage) throws Exception{
setPrimaryStage(primaryStage); // **Set the Stage**
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
}
Now you Can access this stage by calling
现在您可以通过调用访问此阶段
Main.getPrimaryStage()
Main.getPrimaryStage()
In Controller Class
在控制器类中
public class Controller {
public void onMouseClickAction(ActionEvent e) {
Stage s = Main.getPrimaryStage();
s.close();
}
}
