Platform.runLater()方法

时间:2019-05-06 17:33:31

标签: multithreading javafx platform

我试图理解,是否Platform.runLater()方法仅调用SAME JavaFxApplicationThread,如start()方法或同名的另一个线程?

在下面的代码中:

1)首先,使用JavaFxApplicationThread调用了start()方法;

2)然后,调用startFilling()方法,从此处开始新线程;

3),最后,使用openMessage()方法打开了新的Stage,其中使用了Platform.runLater()方法。

请查看代码:

public class FillingTimeLine extends Application {
private LongProperty lp = new SimpleLongProperty(0);
private Timeline timeline = new Timeline();

@Override
public void start(Stage primaryStage) throws Exception {
    // TODO Auto-generated method stub
    System.out.println("\nSTARTING THREAD: " + Thread.currentThread().getName());
    StackPane spane = new StackPane();
    ProgressBar pb = new ProgressBar(0);
    pb.setMinSize(160, 21.5);
    pb.setMaxSize(160, 21.5);
    pb.setPrefSize(160, 21.5);

    pb.progressProperty().bind(lp.divide(10000 * 1.0));
    pb.setStyle("-fx-base:darkgray;-fx-accent:red;");
    spane.getChildren().add(pb);
    Scene scene = new Scene(spane, 300, 300);
    primaryStage.setScene(scene);
    primaryStage.show();
    startFilling();
    openNewStage();

}

public void startFilling() throws InterruptedException {
    new Thread(() -> {
        System.out.println("\nSTARTING THREAD: " + Thread.currentThread().getName());
        timeline = new Timeline(new KeyFrame(Duration.seconds(0), new KeyValue(lp, 0)),
                new KeyFrame(Duration.seconds(20), new KeyValue(lp, 20000)));
        if (Thread.currentThread().isInterrupted()) {
            System.out.println("\n THR WAS INTERRUPTED!");
            return;
        }

        timeline.play();
        try {
            Thread.sleep(20000);
        } catch (InterruptedException ex) {
            System.out.println("\n THR WAS INTERRUPTED!");
            return;
        }

    }).start();

}

public void stopFilling() {
    new Thread(() -> {
        System.out.println("\nSTOPPING THREAD: " + Thread.currentThread().getName());
        timeline.stop();

    }).start();
}

public void openNewStage() {
    Platform.runLater(() -> {

        System.out.println("\nOPENNING THREAD" + Thread.currentThread().getName());
        Stage qst = new Stage();
        StackPane sp = new StackPane();
        Button btn = new Button("STOP");

        btn.setMaxHeight(25);
        btn.setMinHeight(25);
        btn.setPrefHeight(25);
        btn.setMaxWidth(80);
        btn.setMinWidth(80);
        btn.setPrefWidth(80);

        btn.setAlignment(Pos.CENTER);

        btn.setOnAction(e -> {
            try {
                qst.close();
                stopFilling();
            } catch (Exception e1) {
                return;
            }
        });

        sp.getChildren().add(btn);
        Scene scene = new Scene(sp, 200, 120);
        qst.setX(50);
        qst.setY(50);
        qst.setScene(scene);
        qst.setResizable(false);
        qst.show();
    });
}

public static void main(String[] args) {
    launch(args);
}

}

我可以使用Platform.runLater()启用并行执行。而且我期望带有STOP按钮的新舞台将由另一个线程打开,因为JavaFxApplicationThread仍在忙于primaryStage。

但是CONSOLE PUTPUT显示,也使用JavaFxApplicationThread-作为primaryStage打开了新舞台:

开始阅读:JavaFX应用程序线程

启动线程:线程3

打开线程:JavaFX应用程序线程

停止线程:线程4

如果primaryStage仍在显示但未关闭,那么一个线程又如何打开新的Stage?

还是OPENING THREAD-另一个具有相同名称的并行线程?

提前谢谢

0 个答案:

没有答案