JavaFX example: Task

JavaFX example: Task

package javafx_task;

import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_Task extends Application {

    @Override
    public void start(Stage primaryStage) {

        final Task task;
        task = new Task<Void>() {
            @Override
            protected Void call() throws Exception {
                int max = 50;
                for (int i = 1; i <= max; i++) {
                    if (isCancelled()) {
                        break;
                    }
                    updateProgress(i, max);
                    updateMessage(String.valueOf(i));

                    Thread.sleep(100);
                }
                return null;
            }
        };

        ProgressBar progressBar = new ProgressBar();
        progressBar.setProgress(0);
        progressBar.progressProperty().bind(task.progressProperty());
        
        Label labelCount = new Label();
        labelCount.textProperty().bind(task.messageProperty());
        
        final Label labelState = new Label();
        
        Button btnStart = new Button("Start Task");
        btnStart.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                new Thread(task).start();
            }
        });
        
        Button btnReadTaskState = new Button("Read Task State");
        btnReadTaskState.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                labelState.setText(task.getState().toString());
            }
        });
                      

        VBox vBox = new VBox();
        vBox.setPadding(new Insets(5, 5, 5, 5));
        vBox.setSpacing(5);
        vBox.getChildren().addAll(
                progressBar, 
                labelCount,
                btnStart,
                btnReadTaskState, 
                labelState);
        
        StackPane root = new StackPane();
        root.getChildren().add(vBox);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();

    }

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