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StageReference

Kind of class:	public class
Package:	org.casalib.util
Inherits from:	none
Version:	09/06/09
Author:	Aaron Clinger
Classpath:	org.casalib.util.StageReference
File last modified:	Sunday, 06 September 2009, 08:45:20

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/*
    CASA Lib for ActionScript 3.0
    Copyright (c) 2009, Aaron Clinger & Contributors of CASA Lib
    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 the CASA Lib 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 PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/
package org.casalib.util {
    import flash.display.Stage;
    import flash.utils.Dictionary;
    import org.casalib.util.ObjectUtil;
    
    
    /**
        Stores a reference to Stage for classes that cannot easily access it. This class allows you to stored multiple references by ID to different <code>Stage</code>}s which is helpful in an AIR environment.
        
        @author Aaron Clinger
        @version 09/06/09
        @usageNote You must first initialize the class by setting a reference to Stage. See example below:
        @example
            <code>
                package {
                    import org.casalib.display.CasaMovieClip;
                    import org.casalib.util.StageReference;
                    
                    
                    public class MyExample extends CasaMovieClip {
                        
                        
                        public function MyExample() {
                            super();
                            
                            StageReference.setStage(this.stage);
                            
                            trace(StageReference.getStage().stageWidth);
                        }
                    }
                }
            </code>
    */
    public class StageReference {
        public static const STAGE_DEFAULT:String = 'stageDefault';
        protected static var _stageMap:Dictionary;
        
        /**
            Returns a reference to Stage.
            
            @param id: The identifier for the Stage instance.
            @return The Stage instance.
            @throws Error if you try to get a Stage that has not been defined.
        */
        public static function getStage(id:String = StageReference.STAGE_DEFAULT):Stage {
            if (!(id in StageReference._getMap()))
                throw new Error('Cannot get Stage ("' + id + '") before it has been set.');
            
            return StageReference._getMap()[id];
        }
        
        /**
            Stores a reference to Stage.
            
            @param stage: The Stage you wish to store.
            @param id: The identifier for the Stage.
        */
        public static function setStage(stage:Stage, id:String = StageReference.STAGE_DEFAULT):void {
            StageReference._getMap()[id] = stage;
        }
        
        /**
            Removes a stored reference to a Stage.
            
            @param id: The identifier for the Stage.
            @return Returns <code>true</code> if the Stage reference was found and removed; otherwise <code>false</code>.
        */
        public static function removeStage(id:String = StageReference.STAGE_DEFAULT):Boolean {
            if (!(id in StageReference._getMap()))
                return false;
            
            StageReference.setStage(null, id);
            
            return true;
        }
        
        /**
            Finds all the Stage reference ids.
            
            @return An Array comprised of all the Stage reference identifiers.
        */
        public static function getIds():Array {
            return ObjectUtil.getKeys(StageReference._getMap());
        }
        
        /**
            Finds the identifier for a stored Stage reference.
            
            @param stage: The Stage you wish to find the identifier of.
            @return The id for the stored Stage reference or <code>null</code> if it doesn't exist.
        */
        public static function getStageId(stage:Stage):String {
            var map:Dictionary = StageReference._getMap();
            
            for (var i:String in map)
                if (map[i] == stage)
                    return i;
            
            return null;
        }
        
        protected static function _getMap():Dictionary {
            if (StageReference._stageMap == null)
                StageReference._stageMap = new Dictionary();
            
            return StageReference._stageMap;
        }
    }
}

Stores a reference to Stage for classes that cannot easily access it. This class allows you to stored multiple references by ID to different Stage}s which is helpful in an AIR environment.

Usage note:

You must first initialize the class by setting a reference to Stage. See example below:

Example:

package {
    import org.casalib.display.CasaMovieClip;
    import org.casalib.util.StageReference;


    public class MyExample extends CasaMovieClip {


        public function MyExample() {
            super();

            StageReference.setStage(this.stage);

            trace(StageReference.getStage().stageWidth);
        }
    }
}

Summary

Constants

STAGE_DEFAULT : String

Class methods

getStage (id:String = StageReference.STAGE_DEFAULT) : Stage
- Returns a reference to Stage.
setStage (stage:Stage, id:String = StageReference.STAGE_DEFAULT) : void
- Stores a reference to Stage.
removeStage (id:String = StageReference.STAGE_DEFAULT) : Boolean
- Removes a stored reference to a Stage.
getIds : Array
- Finds all the Stage reference ids.
getStageId (stage:Stage) : String
- Finds the identifier for a stored Stage reference.

Constants

STAGE_DEFAULT

public static const STAGE_DEFAULT:String = 'stageDefault'

(read)

Class methods

getIds

public static function getIds (

) : Array

Finds all the Stage reference ids.

Returns:

An Array comprised of all the Stage reference identifiers.

getStage

public static function getStage (

id:String = StageReference.STAGE_DEFAULT) : Stage

Returns a reference to Stage.

Parameters:

id:

The identifier for the Stage instance.

Returns:

The Stage instance.

Throws:

Error if you try to get a Stage that has not been defined.

getStageId

public static function getStageId (

stage:Stage) : String

Finds the identifier for a stored Stage reference.

Parameters:

stage:

The Stage you wish to find the identifier of.

Returns:

The id for the stored Stage reference or null if it doesn't exist.

removeStage

public static function removeStage (

id:String = StageReference.STAGE_DEFAULT) : Boolean

Removes a stored reference to a Stage.

Parameters:

id:

The identifier for the Stage.

Returns:

Returns true if the Stage reference was found and removed; otherwise false.

setStage

public static function setStage (

stage:Stage, id:String = StageReference.STAGE_DEFAULT) : void

Stores a reference to Stage.

Parameters:

stage:

The Stage you wish to store.

id :

The identifier for the Stage.