htmlswapimagerenderer.java

一个使用struts+hibernate+spring开发的完的网站源代码。

/*
 * Copyright 2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.myfaces.custom.swapimage;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.myfaces.component.html.util.AddResource;
import org.apache.myfaces.renderkit.JSFAttr;
import org.apache.myfaces.renderkit.RendererUtils;
import org.apache.myfaces.renderkit.html.HTML;
import org.apache.myfaces.renderkit.html.HtmlRenderer;
import org.apache.myfaces.renderkit.html.HtmlRendererUtils;
import org.apache.myfaces.custom.navigation.HtmlCommandNavigation;

import javax.faces.component.UIComponent;
import javax.faces.component.UIGraphic;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import java.io.IOException;

/**
 * @author Thomas Spiegl
 * @version $Revision: 1.2 $ $Date: 2005/01/09 21:56:33 $
 *          $Log: HtmlSwapImageRenderer.java,v $
 *          Revision 1.2  2005/01/09 21:56:33  tomsp
 *          added new component swapimage
 *
 *          Revision 1.1  2005/01/09 12:36:58  tomsp
 *          added new component swapimage
 *
 */
public class HtmlSwapImageRenderer
        extends HtmlRenderer
{
    private static final Log log = LogFactory.getLog(HtmlSwapImageRenderer.class);

    public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)
            throws IOException
    {
        RendererUtils.checkParamValidity(facesContext, uiComponent, UIGraphic.class);

        ResponseWriter writer = facesContext.getResponseWriter();

        AddResource.addJavaScriptToHeader(HtmlSwapImage.class, "swapimage.js", facesContext);

        String url;
        if (uiComponent instanceof HtmlSwapImage)
        {
            if (uiComponent.getParent() instanceof HtmlCommandNavigation)
            {
                url = ((HtmlCommandNavigation) uiComponent.getParent()).isActive() ?
                    ((HtmlSwapImage) uiComponent).getActiveImageUrl() : ((HtmlSwapImage)uiComponent).getUrl();
            }
            else
            {
                url = ((HtmlSwapImage)uiComponent).getUrl();
            }
        }
        else
        {
            url = (String)uiComponent.getAttributes().get(JSFAttr.URL_ATTR);
        }

        if ((url != null) && (url.length() > 0))
        {
            writer.startElement(HTML.IMG_ELEM, uiComponent);

            String clientId = uiComponent.getClientId(facesContext);
            writer.writeAttribute(HTML.ID_ATTR, clientId, null);

            String src = facesContext.getApplication()
                    .getViewHandler().getResourceURL(facesContext, url);
            writer.writeURIAttribute(HTML.SRC_ATTR,
                                     facesContext.getExternalContext().encodeResourceURL(src),
                                     null);

            if (uiComponent instanceof HtmlSwapImage)
            {
                String swapImageUrl = ((HtmlSwapImage) uiComponent).getSwapImageUrl();
                if (swapImageUrl != null)
                {
                    writer.writeAttribute(HTML.ONMOUSEOVER_ATTR, "SI_MM_swapImage('" + clientId + "','','" + swapImageUrl + "',1);", null);
                    writer.writeAttribute(HTML.ONMOUSEOUT_ATTR, "SI_MM_swapImgRestore();", null);
                }
            }

            HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent, HTML.IMG_PASSTHROUGH_ATTRIBUTES);

            writer.endElement(HTML.IMG_ELEM);
        }
        else
        {
            if (log.isWarnEnabled()) log.warn("Graphic with id " + uiComponent.getClientId(facesContext) + " has no value (url).");
        }
    }
}