/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package timelineevents;

import javafx.animation.AnimationTimer;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.effect.Lighting;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 * A sample that demonstrates events triggered during timeline play. The circle
 * changes its radius in a linear fashion during each key frame and randomly
 * jumps to a new location along the x coordinate at the end of the key frame.
 *
 * @see javafx.animation.KeyFrame
 * @see javafx.animation.KeyValue
 * @see javafx.animation.Timeline
 * @see javafx.util.Duration
 * @see javafx.event.ActionEvent
 * @see javafx.event.EventHandler
 */
public class TimelineEvents extends Application {
    //main timeline
    private Timeline timeline;
    private AnimationTimer timer;

    //variable for storing actual frame
    private Integer i=0;

    private void init(Stage primaryStage) {
        Group root = new Group();
        primaryStage.setResizable(false);
        primaryStage.setScene(new Scene(root, 260,100));
        //create a circle with effect
        final Circle circle = new Circle(20,  Color.rgb(156,216,255));
        circle.setEffect(new Lighting());
        //create a text inside a circle
        final Text text = new Text (i.toString());
        text.setStroke(Color.BLACK);
        //create a layout for circle with text inside
        final StackPane stack = new StackPane();
        stack.getChildren().addAll(circle, text);
        stack.setLayoutX(30);
        stack.setLayoutY(30);

        //create a timeline for moving the circle

        timeline = new Timeline();
        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.setAutoReverse(true);

        //one can add a specific action when each frame is started. There are one or more frames during
        // executing one KeyFrame depending on set Interpolator.
        timer = new AnimationTimer() {
            @Override
            public void handle(long l) {
                text.setText(i.toString());
                i++;
            }

        };

        //create a keyValue with factory: scaling the circle 2times
        KeyValue keyValueX = new KeyValue(stack.scaleXProperty(), 2);
        KeyValue keyValueY = new KeyValue(stack.scaleYProperty(), 2);

        //create a keyFrame, the keyValue is reached at time 2s
        Duration duration = Duration.seconds(2);
        //one can add a specific action when the keyframe is reached
        EventHandler<ActionEvent> onFinished = new EventHandler<ActionEvent>() {
            public void handle(ActionEvent t) {
                 stack.setTranslateX(java.lang.Math.random()*200);
                 //reset counter
                 i = 0;
            }
        };

        KeyFrame keyFrame = new KeyFrame(duration, onFinished , keyValueX, keyValueY);

        //add the keyframe to the timeline
        timeline.getKeyFrames().add(keyFrame);

        root.getChildren().add(stack);
    }
    
    public void play() {
        timeline.play();
        timer.start();
    }
    
    @Override public void stop() {
        timeline.stop();
        timer.stop();
    }

    @Override public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
        play();
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX 
     * application. main() serves only as fallback in case the 
     * application can not be launched through deployment artifacts,
     * e.g., in IDEs with limited FX support. NetBeans ignores main().
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}