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The JavaFX implementation of the Interacto library

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/*
 * Interacto
 * Copyright (C) 2020 Arnaud Blouin
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see .
 */
package io.github.interacto.jfx.interaction.help;

import java.util.ArrayList;
import java.util.List;
import javafx.animation.SequentialTransition;

/**
 * A player for running help animations.
 */
public final class HelpAnimationPlayer {
	public static final HelpAnimationPlayer INSTANCE = new HelpAnimationPlayer();

	private SequentialTransition mainAnimation;
	private List currentAnimations;

	private HelpAnimationPlayer() {
		super();
		mainAnimation = null;
		currentAnimations = null;
	}

	/**
	 * Adds an animation to run.
	 * @param animation The animation to run.
	 */
	public void add(final HelpAnimation animation) {
		if(animation != null) {
			if(mainAnimation == null) {
				mainAnimation = new SequentialTransition();
				currentAnimations = new ArrayList<>();
				mainAnimation.setCycleCount(-1);
			}

			if(currentAnimations.stream().noneMatch(anim -> anim.getZonePane() == animation.getZonePane())) {
				animation.getHelpPane().setDisable(false);
				animation.getHelpPane().setVisible(true);
			}

			mainAnimation.stop();
			currentAnimations.add(animation);
			mainAnimation.getChildren().add(animation.getAnimation());
			mainAnimation.play();
		}
	}

	public void stop(final HelpAnimation animation) {
		if(animation != null && mainAnimation != null && animation.isInstalled()) {
			mainAnimation.stop();
			currentAnimations.remove(animation);
			mainAnimation.getChildren().remove(animation.getAnimation());

			if(currentAnimations.stream().noneMatch(anim -> anim.getZonePane() == animation.getZonePane())) {
				animation.getHelpPane().setDisable(true);
				animation.getHelpPane().setVisible(false);
			}

			if(!currentAnimations.isEmpty()) {
				mainAnimation.play();
			}
		}
	}
}