root/as3/Thread/trunk/src/org/libspark/thread/EnterFrameThreadExecutor.as

/*
 * ActionScript Thread Library
 * 
 * Licensed under the MIT License
 * 
 * Copyright (c) 2008 BeInteractive! (www.be-interactive.org) and
 *                    Spark project  (www.libspark.org)
 * 
 * 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.libspark.thread
{
        import flash.display.MovieClip;
        import flash.events.Event;
        
        /**
         * EnterFrameThreadExecutor クラスは IThreadExecutor インターフェイスの実装クラスで、
         * フレーム実行のタイミングでスレッドを実行します.
         * 
         * @author      yossy:beinteractive
         */
        public class EnterFrameThreadExecutor implements IThreadExecutor
        {
                /**
                 * 新しい EnterFrameThreadExecutor クラスのインスタンスを作成します
                 */
                public function EnterFrameThreadExecutor() 
                {
                }
                
                private var _clip:MovieClip;
                
                /**
                 * @inheritDoc
                 */
                public function start():void
                {
                        if (_clip != null) {
                                return;
                        }
                        
                        _clip = new MovieClip();
                        _clip.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
                }
                
                /**
                 * @inheritDoc
                 */
                public function stop():void
                {
                        if (_clip == null) {
                                return;
                        }
                        
                        _clip.removeEventListener(Event.ENTER_FRAME, enterFrameHandler);
                        _clip = null;
                }
                
                /**
                 * フレーム実行ハンドラ
                 * 
                 * @param       e       イベント
                 * @private
                 */
                private function enterFrameHandler(e:Event):void
                {
                        Thread.executeAllThreads();
                }
        }
}