java JavaFX 8：更改初级阶段的标题
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JavaFX 8: Changing title of primary stage
提问by Hannes
How can the title of the primary stage be changed, when the window is already showen?
当窗口已经显示时，如何更改初级阶段的标题？
Stage#setTitle(String)apparently does not the trick.
Stage#setTitle(String)显然不是诀窍。
回答by James_D
setTitle(...)seems to work fine here:
setTitle(...)似乎在这里工作正常：
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class UpdateStageTitle extends Application {
@Override
public void start(Stage primaryStage) {
TextField titleField = new TextField();
titleField.textProperty().addListener((obs, oldText, newText) ->
primaryStage.setTitle(newText));
HBox root = new HBox(5, new Label("Window title: "), titleField);
root.setAlignment(Pos.CENTER);
Scene scene = new Scene(root, 350, 75);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Updatefollowing comments.
更新以下评论。
For a more complex example, if you need to set this in the controller's initialize method, you need to arrange for the controller to have a reference to the stage before the FXMLLoader's load()method is invoked. You can do this either by calling setControlleron the loader, or by calling setControllerFactory. I generally prefer setting the controller factory, as it allows for use of the fx:controllerattribute in FXML (setting the controller directly prohibits this).
对于更复杂的示例，如果需要在控制器的 initialize 方法中设置 this，则需要安排控制器在调用FXMLLoader的load()方法之前具有对舞台的引用。您可以通过调用setController加载程序或调用setControllerFactory. 我通常更喜欢设置控制器工厂，因为它允许使用fx:controllerFXML中的属性（直接设置控制器禁止这样做）。
So:
所以：
PrimaryStageAware.java:
PrimaryStageAware.java：
package application;
import javafx.stage.Stage;
public interface PrimaryStageAware {
public void setPrimaryStage(Stage primaryStage);
}
Main.java:
主.java：
package application;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.fxml.FXMLLoader;
public class Main extends Application {
@Override
public void start(Stage primaryStage) {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("TitleSetter.fxml"));
loader.setControllerFactory((Class<?> type) -> {
try {
Object controller = type.newInstance();
if (controller instanceof PrimaryStageAware) {
((PrimaryStageAware) controller).setPrimaryStage(primaryStage);
}
return controller ;
} catch (Exception e) {
throw new RuntimeException(e);
}
});
HBox root = loader.load();
Scene scene = new Scene(root,400,400);
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
TitleSetter.fxml:
TitleSetter.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<HBox alignment="CENTER" xmlns:fx="http://javafx.com/fxml/1"
fx:controller="application.TitleSettingController">
<Label text="Update title: "/>
<TextField fx:id="titleField" />
</HBox>
TitleSettingController.java:
TitleSettingController.java：
package application;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
public class TitleSettingController implements PrimaryStageAware {
private Stage stage ;
@FXML
private TextField titleField ;
@Override
public void setPrimaryStage(Stage primaryStage) {
this.stage = primaryStage ;
}
public void initialize() {
updateTitle("Initial title");
titleField.textProperty().addListener((obs, oldTitle, newTitle) -> updateTitle(newTitle));
}
private void updateTitle(String title) {
if (stage != null) {
stage.setTitle(title);
} else {
System.out.println("Warning: null stage");
}
}
}
(With the FXML in the same package alongside the Java files).
（将 FXML 与 Java 文件放在同一个包中）。
回答by Resturp
I worked this out using FXML. This would be my simple interface ChangeTitle.fxml:
我使用 FXML 解决了这个问题。这将是我的简单界面ChangeTitle.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane fx:controller="ChangeTitleController" prefHeight="117.0" prefWidth="198.0"
xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.65">
<children>
<TextField fx:id="input" layoutX="16.0" layoutY="32.0" onAction="#doStuff" />
</children>
</AnchorPane>
Notice The fx:controller=directive that tells FXML which class to use as controller. Also notice That the TextField inputhas an onAction directive that tells FXML to run doStuff()as actionHandler.
注意fx:controller=告诉 FXML 使用哪个类作为控制器的指令。还要注意 TextFieldinput有一个 onAction 指令，它告诉 FXMLdoStuff()作为 actionHandler运行。
Now this is the class that starts the application ChangeTitle.class:
现在这是启动应用程序的类ChangeTitle.class：
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class ChangeTitle extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("ChangeTitle.fxml"));
Scene scene = new Scene(root);
primaryStage.setTitle("Change me");
primaryStage.setScene(scene);
primaryStage.show();
}
}
And finally we have a controller to do the actual work ChangeTitleController.class. We use Stage primStage = (Stage) input.getScene().getWindow();within the doStuff()method to get a handle on the primary stage.
最后我们有一个控制器来做实际的工作ChangeTitleController.class。我们Stage primStage = (Stage) input.getScene().getWindow();在doStuff()方法中使用来获取初级阶段的句柄。
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
public class ChangeTitleController implements Initializable {
@FXML private TextField input;
@Override
public void initialize(URL location, ResourceBundle resources) {
}
@FXML private void doStuff() {
Stage primStage = (Stage) input.getScene().getWindow();
primStage.setTitle(input.getText());
}
}
回答by Алексей Вишняков
You can make Main class as singleton and to contact him via Main.getInstance()
您可以将 Main 类设为单例并通过 Main.getInstance() 与他联系
For example:
例如：
public class Main extends Application {
private static Main instance;
public static Main getInstance() {
return instance;
}
private Stage primaryStage;
@Override
public void start(Stage primaryStage) throws Exception{
instance = this;
this.primaryStage = primaryStage;
Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));
this.primaryStage.setTitle("Init title");
this.primaryStage.setScene(new Scene(root, 900, 650));
this.primaryStage.show();
FlatterFX.style();
}
public static void main(String[] args) {
launch(args);
}
public void updateTitle(String title) {
primaryStage.setTitle(title);
}
}
