如何在特定关键帧的同一点暂停和启动时间线

问题描述

我需要一些帮助来弄清楚如何在程序中实现暂停功能。

我正在创建一个计时器，希望它可以从同一时间点暂停播放。

预期结果：按下pauseButton之后，startButton在暂停按钮停止的位置右起并显示相同的时间。

当前结果：按下pauseButton之后，按下startButton会使计时器启动，比暂停按钮离开的位置少2个单位。因此，如果时间在10:58暂停，则startButton将在8:56拾取时间。

我遇到的另一个问题是，在按下pauseButton之后，时间更改的每次迭代都会将secondTime时间轴递减2而不是1，并且minuteTime时间轴从不变化。

任何帮助将不胜感激。谢谢

// Constant values for time
private final Integer START_TIME_MINUTES = 4;
private final Integer START_TIME_SECONDS = 5;
private final Integer START_TIME_MINUTES = 11;
private final Integer START_TIME_SECONDS = 60;

// Modifiable copies of constants to manipulate
private Integer minutes = START_TIME_MINUTES;
private Integer seconds = START_TIME_SECONDS;

private Integer secondscopy = START_TIME_SECONDS;

// Creating format in which integers are to be displayed
private final NumberFormat formatter = new DecimalFormat("00");

// Storing string value copies of constants in labels
private final Label minuteLabel = new Label(minutes.toString());
private final Label secondLabel = new Label(seconds.toString());
private final Label secondLabel = new Label(formatter.format(seconds));

// Creating a colon label to add to layout
private final Label colonLabel = new Label(":");

// Creating a label made up of copies of constants
private final Label countDownLabel = new Label("Countdown-> " + minuteLabel.getText() + ":" + secondLabel.getText());
private Timeline minuteTime = new Timeline();
private Timeline secondTime = new Timeline();

private Button pauseButton = new Button("Pause"); 

@Override
public void start(Stage primaryStage) throws Exception {
    primaryStage.setTitle("Timer Example");  // Title

    System.out.println(countDownLabel);

    Button startButton = new Button("Start" );  // Button
    startButton.setonAction(actionEvent -> {  // Event Handler
        doTime();  // Calling doTime() function
    });
    startButton.setonAction(actionEvent -> { doTime(); });

    pauseButton.setonAction(actionEvent -> { pauseTime(); });

    HBox layout = new HBox(startButton,minuteLabel,colonLabel,secondLabel);  // Layout
    // Changing display of seconds when minute mark reached
    if (seconds == 60)
        secondLabel.setText("00");

    HBox layout = new HBox(startButton,pauseButton,secondLabel);  // Layout

    Scene myScene = new Scene(layout,200,100); // Adding layout to scene
    primaryStage.setScene(myScene);  // Setting scene to stage
    primaryStage.show();  // displaying stage
}

private void pauseTime(){
    minuteTime.pause();
    secondTime.pause();
}

private void doTime() {

    Timeline minuteTime = new Timeline();
    // Creating a minute timeline

    minuteTime.setCycleCount(Timeline.INDEFINITE);

    Timeline secondTime = new Timeline();
    // Creating a seconds timeline

    secondTime.setCycleCount(Timeline.INDEFINITE);

    if (minuteTime != null && secondTime != null) {}
        minuteTime.stop();


    KeyFrame minuteFrame = new KeyFrame(Duration.seconds(5),actionEvent -> {
        minutes--;
        minuteLabel.setText(minutes.toString());
        if (minutes <= 0) {
            minuteTime.stop();
            Alert minutesAlert = new Alert(Alert.AlertType.@R_344_4045@ION);
            minutesAlert.setHeaderText("Minutes KeyFrame Ended");
            minutesAlert.show();
        }
    });

    if (pauseButton.ispressed()){
        minuteTime.playFrom(minuteTime.getCurrentTime());
        secondTime.playFrom(secondTime.getCurrentTime());
    } else {
        // KeyFrame to decrement minuteTime every minute
        KeyFrame minuteFrame = new KeyFrame(Duration.seconds(60),actionEvent -> {
            minutes--;
            minuteLabel.setText(minutes.toString()); // Modifying minute label
            if (minutes <= 0)
                minuteTime.stop();
        });

    KeyFrame secondFrame = new KeyFrame(Duration.seconds(1),actionEvent -> {
        seconds--;
        secondLabel.setText(seconds.toString());

            // continues seconds timer until minute timer is up
            if (seconds <= 0 && minuteTime.getStatus() == Animation.Status.STOPPED) {
        // KeyFrame to decrement secondTime every second
        KeyFrame secondFrame = new KeyFrame(Duration.seconds(1),actionEvent -> {
            seconds--;  // decrement seconds
            secondLabel.setText(formatter.format(seconds)); // modify seconds label

            // stops secondTime if seconds reaches 0 and minuteTime stopeed
            if (seconds <= 0 && minuteTime.getStatus() == Animation.Status.STOPPED)
                secondTime.stop();
                Alert secondsAlert = new Alert(Alert.AlertType.@R_344_4045@ION);
                secondsAlert.setHeaderText("Seconds KeyFrame Ended");
                secondsAlert.show();

            // if secondTime reaches 0,but minuteTime is still running,reset seconds
            if (seconds <= 0 && minuteTime.getStatus() == Animation.Status.RUNNING)
                seconds = START_TIME_SECONDS;

            } 

            // Changes seconds label to 00 when minute mark is reaches
            if (seconds == 60)
                secondLabel.setText("00");
        });

            if (seconds <= 0 && minuteTime.getStatus() == Animation.Status.RUNNING){
                seconds = START_TIME_SECONDS;
            }
    });

    minuteTime.getKeyFrames().add(minuteFrame);
    minuteTime.playFromStart(); // execute the timeline


    secondTime.getKeyFrames().add(secondFrame);
    secondTime.playFromStart();
        minuteTime.getKeyFrames().add(minuteFrame); // Adding frame to timeline
        minuteTime.playFrom(Duration.seconds(59)); // execute the timeline

        secondTime.getKeyFrames().add(secondFrame);
        secondTime.playFromStart();
    }
}`

解决方法

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