Start, Stop and resume an animation

[x32x01]

Start, Stop and resume an animation

import javafx.animation.Animation;
import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.animation.TimelineBuilder;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.GroupBuilder;
import javafx.scene.Scene;
import javafx.scene.SceneBuilder;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonBuilder;
import javafx.scene.layout.HBoxBuilder;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.LineBuilder;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {
  DoubleProperty startXVal = new SimpleDoubleProperty(100.0);

  Button startButton;
  Button pauseButton;
  Button resumeButton;
  Button stopButton;
  Line line;

  Timeline anim = TimelineBuilder.create()
    .autoReverse(true)
    .keyFrames(
      new KeyFrame(
        new Duration(0.0),
        new KeyValue(startXVal, 100.0)
      ),
      new KeyFrame(
        new Duration(1000.0),
        new KeyValue(startXVal, 300.0, Interpolator.LINEAR)
      )
    )
    .cycleCount(Timeline.INDEFINITE)
    .build();

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

  @Override
  public void start(Stage stage) {
    Scene scene  = SceneBuilder.create()
      .width(400)
      .height(500)
      .root(
        GroupBuilder.create()
          .children(
            line = LineBuilder.create()
              .startY(50)
              .endX(200)
              .endY(400)
              .strokeWidth(4)
              .stroke(Color.BLUE)
              .build(),
            HBoxBuilder.create()
              .layoutX(60)
              .layoutY(420)
              .spacing(10)
              .children(
                startButton = ButtonBuilder.create()
                  .text("Start")
                  .onAction(new EventHandler<ActionEvent>() {
                    @Override public void handle(ActionEvent e) {
                      anim.playFromStart();
                    }
                  })
                  .build(),
                pauseButton = ButtonBuilder.create()
                  .text("Pause")
                  .onAction(new EventHandler<ActionEvent>() {
                    @Override public void handle(ActionEvent e) {
                      anim.pause();
                    }
                  })
                  .build(),
                resumeButton = ButtonBuilder.create()
                  .text("Resume")
                  .onAction(new EventHandler<ActionEvent>() {
                    @Override public void handle(ActionEvent e) {
                      anim.play();
                    }
                  })
                  .build(),
                stopButton = ButtonBuilder.create()
                  .text("Stop")
                  .onAction(new EventHandler<ActionEvent>() {
                    @Override public void handle(ActionEvent e) {
                      anim.stop();
                    }
                  })
                  .build()
              )
              .build()
          )
          .build()
      )
      .build();

    line.startXProperty().bind(startXVal);
    startButton.disableProperty().bind(anim.statusProperty()
            .isNotEqualTo(Animation.Status.STOPPED));
    pauseButton.disableProperty().bind(anim.statusProperty()
            .isNotEqualTo(Animation.Status.RUNNING));
    resumeButton.disableProperty().bind(anim.statusProperty()
            .isNotEqualTo(Animation.Status.PAUSED));
    stopButton.disableProperty().bind(anim.statusProperty()
            .isEqualTo(Animation.Status.STOPPED));

    stage.setScene(scene);
    stage.setTitle("Metronome 1");
    stage.show();
  }
}