package taskcancel;

import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class TaskCancel extends Application {
    
    public static void main(String[] args) {
        Application.launch(args);
    }
    
    @Override
    public void start(Stage stage) {
        Group root = new Group();
        
        final Button runButton = new Button("Run");
        final Button cancelButton = new Button("Cancel");
        final ProgressBar progressBar = new ProgressBar();
        progressBar.setVisible(false);
        final Label resultLabel = new Label();
        HBox hb1 = new HBox(5);
        hb1.getChildren().addAll(runButton, cancelButton, progressBar, resultLabel);
        
        runButton.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent t) {
                
                progressBar.setVisible(true);
                
                final Task task = new Task<String>() {
                    @Override
                    protected String call() throws Exception {
                        final int MAX = 100000;
                        for (int i = 0; i < MAX; i++) {
                            for (int j = 0; j < MAX; j++) {
                                int temp = i * j;
                            }
                            updateProgress(i, MAX);
                        }
                        return "Hello";
                    }            

                };
        
                runButton.disableProperty().bind(task.runningProperty());
                progressBar.progressProperty().bind(task.progressProperty());
                resultLabel.textProperty().bind(task.valueProperty());        

                cancelButton.setOnAction(new EventHandler<ActionEvent>() {
                    public void handle(ActionEvent t) {
                        task.cancel(true);
                    }
                });

                new Thread(task).start();
            }
        });
        
        root.getChildren().add(hb1);
        
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.show();
    }
}