当窗口已经显示时,如何更改初级阶段的标题?
Stage#setTitle(String)
显然不是诀窍。
最佳答案
setTitle(...)
在这里似乎工作正常:
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);
}
}
更新以下评论。
更复杂的例子,如果需要在controller的initialize方法中设置这个,需要安排controller在FXMLLoader
的之前有stage的引用load()
方法被调用。您可以通过在加载器上调用 setController
或调用 setControllerFactory
来完成此操作。我通常更喜欢设置 Controller 工厂,因为它允许在 FXML 中使用 fx:controller
属性(直接设置 Controller 禁止这样做)。
所以:
PrimaryStageAware.java:
package application;
import javafx.stage.Stage;
public interface PrimaryStageAware {
public void setPrimaryStage(Stage primaryStage);
}
主要.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);
}
}
标题 setter .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>
标题设置 Controller .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");
}
}
}
(FXML 与 Java 文件位于同一个包中)。
关于JavaFX 8 : Changing title of primary stage,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26494865/