FrameUtil

/*
    CASA Lib for ActionScript 3.0
    Copyright (c) 2011, Aaron Clinger & Contributors of CASA Lib
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      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
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*/
package org.casalib.util {
    import flash.display.MovieClip;
    import org.casalib.errors.ArguementTypeError;
    
    
    /**
        Utilities for determining label positions and adding and removing frame scripts.
        
        @author Mike Creighton
        @author Aaron Clinger
        @version 02/12/10
    */
    public class FrameUtil {
        
        
        /**
            Determines the frame number for the specified label.
            
            @param target: The MovieClip to search for the frame label in.
            @param label: The name of the frame label.
            @return The frame number of the label or -1 if the frame label was not found.
        */
        public static function getFrameNumberForLabel(target:MovieClip, label:String):int {
            var labels:Array = target.currentLabels;
            var l:int        = labels.length;
            
            while (l--)
                if (labels[l].name == label)
                    return labels[l].frame;
            
            return -1;
        }
        
        /**
            Calls a specified method when a specific frame is reached in a MovieClip timeline.
            
            @param target: The MovieClip that contains the frame.
            @param frame: The frame to be notified when reached. Can either be a frame number (uint), or the frame label (String).
            @param notify: The function that will be called when the frame is reached.
            @return Returns true if the frame was found; otherwise false.
            @throws ArguementTypeError if you pass a type other than a String or uint to parameter frame.
        */
        public static function addFrameScript(target:MovieClip, frame:*, notify:Function):Boolean {
            if (frame is String)
                frame = FrameUtil.getFrameNumberForLabel(target, frame);
            else if (!(frame is uint))
                throw new ArguementTypeError('frame');
            
            if (frame == -1 || frame == 0 || frame > target.totalFrames)
                return false;
            
            target.addFrameScript(frame - 1, notify);
            
            return true;
        }
        
        /**
            Removes a frame from triggering/calling a function when reached.
            
            @param target: The MovieClip that contains the frame.
            @param frame: The frame to remove notification from. Can either be a frame number (uint), or the frame label (String).
            @throws ArguementTypeError if you pass a type other than a String or uint to parameter frame.
        */
        public static function removeFrameScript(target:MovieClip, frame:*):void {
            if (frame is String)
                frame = FrameUtil.getFrameNumberForLabel(target, frame);
            else if (!(frame is uint))
                throw new ArguementTypeError('frame');
            
            if (frame == -1 || frame == 0 || frame > target.totalFrames)
                return;
            
            target.addFrameScript(frame - 1, null);
        }
    }
}