package countDownTimer;

 import java.text.ParseException;

 import java.text.SimpleDateFormat;

 import java.util.Calendar;

 import java.util.Date;

 import java.util.Timer;

 import java.util.TimerTask;

 import javafx.application.Application;

 import javafx.event.ActionEvent;

 import javafx.event.EventHandler;

 import javafx.geometry.HPos;

 import javafx.geometry.Insets;

 import javafx.geometry.Pos;

 import javafx.scene.Scene;

 import javafx.scene.control.Button;

 import javafx.scene.control.TextField;

 import javafx.scene.layout.GridPane;

 import javafx.scene.layout.Priority;

 import javafx.scene.text.Font;

 import javafx.scene.text.FontWeight;

 import javafx.scene.text.Text;

 import javafx.stage.Stage;

 import javafx.stage.WindowEvent;

 public class App extends Application {

     Timer timer = new Timer();

     Button btnStart = new Button("Start");

     Button btnPause = new Button("Pause");

     Button btnSet = new Button("Set");

     Text textTimeleft = new Text("HH:MM:SS");

     TextField textSet = new TextField("HH:MM");

     Calendar timenow =  Calendar.getInstance();

     Calendar timeZero =  Calendar.getInstance();

     boolean bPause = false;

     TimerTask timerTask = new TimerTask() {

         @Override

         public void run() {

             if (bPause) {

                 if(timenow.compareTo(timeZero)>0) {

                     timenow.set(Calendar.SECOND, timenow.get(Calendar.SECOND)-1);

                     if ((timenow.getTimeInMillis() - timeZero.getTimeInMillis()) <= 10000) {

                         flashText();

                     }

                 }else {

                     bPause = false;

                 }

                 //display

                 SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");

                 String dateString = formatter.format(timenow.getTime());

                 textTimeleft.setText(dateString);

             }

         }

     };

     boolean bToggle = false;

     private void flashText() {

         bToggle = !bToggle;

         if(bToggle) {

             textTimeleft.setFont(Font.font("Tahoma", FontWeight.BOLD, 64));

         }else {

             textTimeleft.setFont(Font.font("Tahoma", FontWeight.NORMAL, 64));

         }

     }

     public static void main(String[] args) {

         launch(args);

     }

     @Override

     public void start(Stage primaryStage) throws Exception {

         timer.scheduleAtFixedRate(timerTask, 0, 1000);

         try {

             SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");

             Date dateZero = sdf.parse("00:00");

             Date dataSet = sdf.parse("00:10");

             timenow.setTime(dataSet);

             timeZero.setTime(dateZero);

             textTimeleft.setText("00:10:00");

         } catch (ParseException e) {

         }

         btnStart.setOnAction(new EventHandler<ActionEvent>() {

             @Override

             public void handle(ActionEvent event) {

                 bPause = true;

             }

         });

         btnPause.setOnAction(new EventHandler<ActionEvent>() {

             @Override

             public void handle(ActionEvent event) {

                 bPause = false;

             }

         });

         btnSet.setOnAction(new EventHandler<ActionEvent>() {

             @Override

             public void handle(ActionEvent event) {

                 SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");

                 try {

                     timenow.setTime(sdf.parse(textSet.getText()));

                     sdf = new SimpleDateFormat("HH:mm:ss");

                     String dateString = sdf.format(timenow.getTime());

                     textTimeleft.setText(dateString);

                 } catch (ParseException e) {

                 }

             }

         });

         GridPane grid = new GridPane();

         grid.setAlignment(Pos.CENTER);

         grid.setPadding(new Insets(25, 25, 25, 25));

         grid.add(btnStart, 0, 0);

         grid.add(btnPause, 2, 0);

         grid.add(btnSet, 2, 2);

         textTimeleft.setFont(Font.font("Tahoma", FontWeight.NORMAL, 64));

         grid.add(textTimeleft, 0, 1, 2, 1);

         GridPane.setHalignment(textTimeleft, HPos.CENTER);

         GridPane.setColumnSpan(textTimeleft, GridPane.REMAINING);

         GridPane.setHgrow(textTimeleft, Priority.ALWAYS);

         grid.add(textSet, 0, 2);

         Scene scene = new Scene(grid);

         primaryStage.setScene(scene);

         primaryStage.setTitle("倒计时");

         primaryStage.show();

         primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {

             @Override

             public void handle(WindowEvent event) {

                 timer.cancel();

             }

         });

     }

 }