sequence.as

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/**
 * Copyright (c) 2007 Moses Gunesch
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.goasap.utils {
	import org.goasap.interfaces.IPlayable;	

	/**
	 * Simple playable sequence, composed of groups of playable items.
	 * 
	 * <p>A sequence can be built by passing any item that implements IPlayable
	 * and uses the standard set of PlayableBase play-state constants.
	 * Sequences are composed of SequenceStep instances, which can contain any 
	 * number of child items such as LinearGo or PlayableGroup instances.
	 * Sequences dispatch SequenceEvent.ADVANCE each time a step completes and
	 * the play index advances to the next one, then GoEvent.COMPLETE when done.</p>
	 * 
	 * <p>Other events dispatched include the GoEvent types START, STOP, PAUSE, RESUME,
	 * and CYCLE if the repeater.cycles property is set to a value other than one.</p>
	 * 
	 * <p>All items in each step must dispatch COMPLETE or STOP before a Sequence
	 * will advance. This simple behavior can be limiting, especially with steps that
	 * are composed of groups of items. The Go utility package includes another 
	 * sequencer called SequenceCA, which allows you to define different ways a sequence 
	 * can advance: after a particular item in a step, a particular duration, after 
	 * an event fires, etc.</p>
	 * 
	 * @see SequenceBase
	 * @see SequenceCA
	 * @author Moses Gunesch
	 */
	public class Sequence extends SequenceBase {

		// -== Public Properties ==-
		
		// Also in super:
		// length : uint   [Read-only.]
		// playIndex : int [Read-only.]
		// steps : Array
		// start() : Boolean
		// stop() : Boolean
		// pause() : Boolean
		// resume() : Boolean
		// skipTo(index:Number) : Boolean
		
		/**
		 * Returns the currently-playing SequenceStep.
		 * @return The currently-playing SequenceStep.
		 * @see #getStepAt()
		 * @see #getStepByID()
		 * @see #steps
		 * @see #lastStep
		 */
		public function get currentStep() : SequenceStep {
			return (super._getCurrentStep());
		}
		
		/**
		 * Returns the final SequenceStep in the current sequence.
		 * @return The final SequenceStep in the current sequence.
		 * @see #getStepAt()
		 * @see #getStepByID()
		 * @see #steps
		 * @see #currentStep
		 */
		public function get lastStep() : SequenceStep {
			return (super._getLastStep());
		}
		
		// -== Public Methods ==-
		
		/**
		 * Constructor.
		 * 
		 * @param items		Any number of IPlayable instances (e.g. LinearGo, PlayableGroup,
		 * 					SequenceStep) as separate arguments, or a single array of them.
		 */
		public function Sequence(...items) {
			super((items[ 0 ] is Array) ? items[ 0 ] : items);
		}
		
		/**
		 * Retrieves any SequenceStep from the steps array.
		 * @param index		An array index starting at 0.
		 * @return			The SequenceStep instance at this index.
		 * @see #getStepByID()
		 * @see #currentStep
		 * @see #lastStep
		 */
		public function getStepAt(index:int) : SequenceStep {
			return (super._getStepAt(index) as SequenceStep);
		}
		
		/**
		 * Locates a step with the specified playableID. To search within a step for a
		 * child by playableID, use the step instance's <code>getChildByID</code> method.
		 *  
		 * @param playableID	The step instance's playableID to search for.
		 * @return				The SequenceStep with the matching playableID.
		 * @see #getStepAt()
		 */
		public function getStepByID(playableID:*) : SequenceStep {
			return (super._getStepByID(playableID) as SequenceStep);
		}
		
		/**
		 * Adds a single IPlayable instance (e.g. LinearGo, PlayableGroup, SequenceStep) 
		 * to the end of the steps array, or optionally adds the instance into the last 
		 * SequenceStep instead of adding it as a new step.
		 * 
		 * <p>To remove a step use the <code>removeStepAt</code> method.</p>
		 * 
		 * @param item			The playable item to add to the sequence. Note
		 * 						that when new steps are added, any IPlayable
		 * 						instance of a type other than SequenceStep is 
		 * 						automatically wrapped in a new SequenceStep.
		 * 						
		 * @param addToLastStep	If true is passed the item is added to the last
		 * 						existing SequenceStep in the steps array. This
		 * 						option should be used with individual items that
		 * 						you want added as children to the SequenceStep.
		 * 						If there are no steps yet this option ignored and
		 * 						a new step is created.
		 * 						
		 * @return New length of the steps array.
		 */
		public function addStep(item:IPlayable, addToLastStep:Boolean=false): int {
			return (super._addStep(item, addToLastStep, SequenceStep));
		}
		
		/**
		 * Adds a single IPlayable instance (e.g. LinearGo, PlayableGroup, 
		 * SequenceStep) at a specific index in the steps array. Calling this method 
		 * stops any sequence play currently in progress.
		 * 
		 * @param item		The playable item to splice into the sequence.
		 * 
		 * @param index		Position in the array starting at 0, or a negative 
		 * 					index like Array.splice.
		 * 					
		 * @return 			New length of the steps array.
		 */
		public function addStepAt(item:IPlayable, index:int): int {
			return (super._addStepAt(index, item, SequenceStep));
		}

		/**
		 * Removes and returns the SequenceStep at a specific index from the steps 
		 * array. Calling this method stops any sequence play currently in progress.
		 * 
		 * @param index		Position in the array starting at 0, or a negative 
		 * 					index like Array.splice.
		 * 					
		 * @return 			The SequenceStep instance removed from the steps array.
		 */
		public function removeStepAt(index:int): SequenceStep {
			return (super._removeStepAt(index) as SequenceStep);
		}
		
		// Also in super:
		// length : uint   [Read-only.]
		// playIndex : int [Read-only.]
		// steps : Array
		// start() : Boolean
		// stop() : Boolean
		// pause() : Boolean
		// resume() : Boolean
		// skipTo(index:Number) : Boolean
	}
}