/*
 * Copyright (c) 2003-onwards Shaven Puppy Ltd
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'Shaven Puppy' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.puppygames.applet;

/**
 * $Id: Tickable.java,v 1.1 2009/07/01 15:38:53 foo Exp $
 * A thing which is ticked every frame by a Screen.
 * <p>
 * @author $Author: foo $
 * @version $Revision: 1.1 $
 */
public interface Tickable {

	/**
	 * Tick this thing.
	 */
	void tick();

	/**
	 * Update this thing's appearance (stage 2 tick). This is called on all Tickables generally after they have all ticked().
	 */
	void update();

	/**
	 * Remove this thing. After this call, {@link #isActive()} should return <code>false</code>. If {@link #isActive()} already
	 * returns <code>false</code> then this method should do nothing.
	 */
	void remove();

	/**
	 * Is this thing still active?
	 * @return boolean
	 */
	boolean isActive();

	/**
	 * Called when this Tickable is added to the specified {@link Screen}
	 * @param screen The screen to which the tickable was added
	 */
	void spawn(Screen screen);

}