Use a Task
。您需要安排在 FX 应用程序线程上创建场景并更新舞台。最干净的方法是使用Task<Parent>
:
Task<Parent> loadTask = new Task<Parent>() {
@Override
public Parent call() throws IOException {
FXMLLoader loader = new FXMLLoader();
Parent root = loader.load(getClass().getResource("/uatreportgeneration/fxml/Home.fxml"));
return root ;
}
};
loadTask.setOnSucceeded(e -> {
Scene scene = new Scene(loadTask.getValue());
mainStage.setScene(scene);
mainStage.show();
stage.hide();
System.out.println("Stage showing");
// Get current screen of the stage
ObservableList<Screen> screens = Screen.getScreensForRectangle(new Rectangle2D(mainStage.getX(), mainStage.getY(), mainStage.getWidth(), mainStage.getHeight()));
// Change stage properties
Rectangle2D bounds = screens.get(0).getVisualBounds();
mainStage.setX(bounds.getMinX());
mainStage.setY(bounds.getMinY());
mainStage.setWidth(bounds.getWidth());
mainStage.setHeight(bounds.getHeight());
System.out.println("thread complete");
});
loadTask.setOnFailed(e -> loadTask.getException().printStackTrace());
Thread thread = new Thread(loadTask);
thread.start();
这是使用此技术的 SSCCE:
main.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.VBox?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<VBox spacing="10" xmlns:fx="http://javafx.com/fxml/1" fx:controller="MainController">
<padding>
<Insets top="24" left="24" right="24" bottom="24"/>
</padding>
<TextField />
<Button fx:id="button" text="Show Window" onAction="#showWindow"/>
</VBox>
主控制器(使用Task
方法如上所示):
import java.io.IOException;
import javafx.concurrent.Task;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
public class MainController {
@FXML
private Button button ;
@FXML
private void showWindow() {
Task<Parent> loadTask = new Task<Parent>() {
@Override
public Parent call() throws IOException, InterruptedException {
// simulate long-loading process:
Thread.sleep(5000);
FXMLLoader loader = new FXMLLoader(getClass().getResource("test.fxml"));
Parent root = loader.load();
return root ;
}
};
loadTask.setOnSucceeded(e -> {
Scene scene = new Scene(loadTask.getValue());
Stage stage = new Stage();
stage.initOwner(button.getScene().getWindow());
stage.setScene(scene);
stage.show();
});
loadTask.setOnFailed(e -> loadTask.getException().printStackTrace());
Thread thread = new Thread(loadTask);
thread.start();
}
}
测试.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Button?>
<?import javafx.geometry.Insets?>
<BorderPane xmlns:fx="http://javafx.com/fxml/1" fx:controller="TestController">
<padding>
<Insets top="24" left="24" right="24" bottom="24"/>
</padding>
<center>
<Label fx:id="label" text="This is a new window"/>
</center>
<bottom>
<Button text="OK" onAction="#closeWindow" BorderPane.alignment="CENTER">
<BorderPane.margin>
<Insets top="5" bottom="5" left="5" right="5"/>
</BorderPane.margin>
</Button>
</bottom>
</BorderPane>
测试控制器:
import javafx.fxml.FXML;
import javafx.scene.control.Label;
public class TestController {
@FXML
private Label label ;
@FXML
private void closeWindow() {
label.getScene().getWindow().hide();
}
}
主要应用:
import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws IOException {
primaryStage.setScene(new Scene(FXMLLoader.load(getClass().getResource("main.fxml"))));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
请注意,按下按钮后,您仍然可以在“加载”FXML 的五秒钟内在文本字段中键入内容,因此 UI 仍保持响应状态。