Synnefo

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. 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.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A 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.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client.animation;

import com.google.gwt.animation.client.Animation;

import com.google.gwt.user.client.DOM;

import com.google.gwt.user.client.ui.Widget;

public class FadeIn extends Animation {

        Widget widget;

        int initialOpacity = 100;

        double currOpacity = 100;

        public FadeIn(Widget aWidget){

                widget = aWidget;

        }

        @Override

        protected void onUpdate(double progress) {

                if(currOpacity > 0.0){

                        progress = 1.0 - progress;

                        currOpacity = initialOpacity * progress;

                        DOM.setStyleAttribute(widget.getElement(), "opacity", ""+new Double(1d - currOpacity / 100d));

                        //required for ie to work

                        //Disabled because IE has bugs rendering non-opaque objects

                        //int opacityToSet = new Double(currOpacity).intValue();

                        //DOM.setStyleAttribute(widget.getElement(), "filter", "alpha(opacity=" + (initialOpacity - opacityToSet) + ")");

                }

        }

}