Cairngorm Code

/**
 *  Copyright (c) 2007 - 2009 Adobe
 *  All rights reserved.
 *
 *  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 samples
{
    import com.adobe.cairngorm.task.Task;

    import mx.events.StyleEvent;
    import mx.styles.StyleManager;

    /**
     * A task that loads a runtime stylesheet.
     */
    public class LoadStylesheet extends Task
    {
        //------------------------------------------------------------------------
        //
        //  Private properties
        //
        //------------------------------------------------------------------------

        private var loader:IEventDispatcher;

        //------------------------------------------------------------------------
        //
        //  Public properties
        //
        //------------------------------------------------------------------------

        //-------------------------------
        //  Simple bindables
        //-------------------------------

        [Bindable]
        public var url:String;

        //------------------------------------------------------------------------
        //
        //  Implementation : TaskflowTask
        //
        //------------------------------------------------------------------------

        override protected function performTask():void
        {
            if (url == null)
                fault();

            loader = StyleManager.loadStyleDeclarations(url);
            loader.addEventListener(StyleEvent.COMPLETE, onLoadingComplete);
            loader.addEventListener(StyleEvent.ERROR, onLoadingError);
        }

        //------------------------------------------------------------------------
        //
        //  Event listeners
        //
        //------------------------------------------------------------------------

        private function onLoadingComplete(event:StyleEvent):void
        {
            loader.removeEventListener(StyleEvent.ERROR, onLoadingError);
            cleanUp();
            complete();
        }

        private function onLoadingError(event:StyleEvent):void
        {
            cleanUp(); // TODO Don't clean-up fault listener due to framework bug!
            fault();
        }

        private function cleanUp():void
        {
            loader.removeEventListener(StyleEvent.COMPLETE, onLoadingComplete);
            loader = null;
        }
    }
}