JavaFX-如何在另一个控制器中的一个控制器中使用方法？
使用SceneBuilder。我有2个阶段，每个阶段都有一个控制器：
stage1Controller，
stage2Controller。
public class Stage1Controller { @FXML
private MenuItem translate;
@FXML
private Menu file;
@FXML
private Menu edit;
@FXML
private Menu help;
@FXML
private void handleTranslate (ActionEvent event){
translateFirstStage();
//HOW TO ACCESS THE stage2Controller setLabel()??
}
private void translateFirstStage(){
file.setText("Fichier");
edit.setText("Modifier");
help.setText("Aide");
}
}
public class Stage2Controller { @FXML
private Label lb;
private void setLabel(String string){
lb.setText("string");
}
}
这是使用2种方法
（称为in Start(Stage primaryStage)方法）将这两个fxml文件加载到Main.java类中的方式：
public void firstStage() { try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage1.fxml"));
rootLayout = (BorderPane) loader.load();
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void secondStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage2.fxml"));
XD = (AnchorPane) loader.load();
// Show the scene containing the root layout.
Scene scene = new Scene(XD);
Stage stage = new Stage();
stage.setScene(scene);
stage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
- 该
handleTranslate(ActionEvent event)方法在第一阶段中用作OnAction方法MenuItem translate，它在两个阶段都转换视图。
回答：
“快速又脏”的方法是给的Stage1Controller引用Stage2Controller：
public class Stage1Controller { private final Stage2Controller stage2Controller ;
public void setStage2Controller(Stage2Controller stage2Controller) {
this.stage2Controller = stage2Controller ;
}
// ...
@FXML
private void handleTranslate (ActionEvent event){
translateFirstStage();
stage2Controller.setLabel(...);
}
// other code as before ...
}
现在在您的主应用程序中：
public class MainApp extends Application { private Stage1Controller stage1Controller ;
private Stage2Controller stage2Controller ;
@Override
public void start(Stage primaryStage) {
firstStage();
secondStage();
stage1Controller.setStage2Controller(stage2Controller);
// ...
}
public void firstStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage1.fxml"));
rootLayout = (BorderPane) loader.load();
stage1Controller = loader.getController();
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void secondStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage2.fxml"));
XD = (AnchorPane) loader.load();
stage2Controller = loader.getController();
// Show the scene containing the root layout.
Scene scene = new Scene(XD);
Stage stage = new Stage();
stage.setScene(scene);
stage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
// ...
}
但是，更可靠的方法是让两个控制器访问共享的模型类，并存储数据。如果使用JavaFX可观察属性表示数据，则控制器可以侦听其关心的属性的更改。例如：
public class Model { private final StringProperty text = new SimpleStringProperty("Initial text...");
public StringProperty textProperty() {
return text ;
}
public final void setText(String text) {
textProperty().set(text);
}
public final String getText() {
return textProperty().get();
}
// other properties as needed...
}
现在，您的控制器将如下所示：
public class Stage1Controller { private Model model ;
public void setModel(Model model) {
this.model = model ;
}
@FXML
private void handleTranslate (ActionEvent event){
translateFirstStage();
model.setText(...); // value will appear in stage2 controller's label!
}
// ...
}
和
public class Stage2Controller { @FXML
private Label lb ;
private Model model ;
public void setModel(Model model) {
lb.textProperty().unbind();
this.model = model ;
lb.textProperty().bind(model.textProperty());
}
// ...
}
在这种情况下，您的主应用程序如下所示：
public class MainApp extends Application { private final Model = new Model();
@Override
public void start(Stage primaryStage) {
// ...
}
public void firstStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage1.fxml"));
rootLayout = (BorderPane) loader.load();
Stage1Controller controller = loader.getController();
controller.setModel(model);
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void secondStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage2.fxml"));
XD = (AnchorPane) loader.load();
Stage2Controller controller = loader.getController();
controller.setModel(model);
// Show the scene containing the root layout.
Scene scene = new Scene(XD);
Stage stage = new Stage();
stage.setScene(scene);
stage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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