htmlcollapsiblepanelrenderer.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.collapsiblepanel;

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 javax.faces.application.Application;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIComponent;
import javax.faces.component.html.HtmlCommandLink;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

import java.io.IOException;
import java.util.List;

/**
 * @author Kalle Korhonen (latest modification by $Author: matzew $)
 * @version $Revision: 1.1 $ $Date: 2005/01/10 08:22:17 $
 * $Log: HtmlCollapsiblePanelRenderer.java,v $
 * Revision 1.1  2005/01/10 08:22:17  matzew
 * added new component CollapsiblePanel (contributed by Kalle Korhonen) (MYFACES-68)
 *
 * 
 */
public class HtmlCollapsiblePanelRenderer extends HtmlRenderer {
    //private static final Log log = LogFactory.getLog(HtmlCollapsiblePanel.class);
    private static final String LINK_ID     = "ToggleCollapsed".intern();

    public boolean getRendersChildren()
    {
        return true;
    }
    
    public void encodeChildren(FacesContext facesContext, UIComponent uiComponent) throws IOException
    {
      // RendererUtils.checkParamValidity(facesContext, uiComponent, HtmlCollapsiblePanel.class);
      ResponseWriter writer = facesContext.getResponseWriter();
      HtmlCollapsiblePanel collapsiblePanel = (HtmlCollapsiblePanel)uiComponent;
      
      HtmlCommandLink link = getLink(facesContext, collapsiblePanel);
      collapsiblePanel.getChildren().add(link);
      
      // Always render the link to toggle the collapsed state
      RendererUtils.renderChild(facesContext, link);
      link.setRendered(false);
      
      // conditionally render the rest of the children
      if (!collapsiblePanel.isCollapsed()) {
        HtmlRendererUtils.writePrettyLineSeparator(facesContext);
        // TODO apply styles from the parent element to this DIV 
      	writer.startElement(HTML.DIV_ELEM, null);
      	RendererUtils.renderChildren(facesContext, uiComponent);
        writer.endElement(HTML.DIV_ELEM );
        HtmlRendererUtils.writePrettyLineSeparator(facesContext);
      }

      link.setRendered(true);
    }

    public void encodeBegin(FacesContext facesContext, UIComponent uiComponent) throws IOException
    {
      RendererUtils.checkParamValidity(facesContext, uiComponent, HtmlCollapsiblePanel.class);
      ResponseWriter writer = facesContext.getResponseWriter();

      HtmlRendererUtils.writePrettyLineSeparator(facesContext);
    	writer.startElement(HTML.DIV_ELEM, null);
    	
      HtmlCollapsiblePanel collapsiblePanel = (HtmlCollapsiblePanel)uiComponent;
      ViewHandler viewHandler = facesContext.getApplication().getViewHandler();
      String viewId = facesContext.getViewRoot().getViewId();
      String actionURL = viewHandler.getActionURL(facesContext, viewId);

      Application application = facesContext.getApplication();
    }
    
    
    public void encodeEnd(FacesContext facesContext, UIComponent uiComponent) throws IOException
    {
      //RendererUtils.checkParamValidity(facesContext, uiComponent, HtmlCollapsiblePanel.class);
      ResponseWriter writer = facesContext.getResponseWriter();
      writer.endElement(HTML.DIV_ELEM );
      HtmlRendererUtils.writePrettyLineSeparator(facesContext);
    }
    
    public void decode(FacesContext facesContext, UIComponent uiComponent)
    {
    		RendererUtils.checkParamValidity(facesContext, uiComponent, HtmlCollapsiblePanel.class);
        HtmlCollapsiblePanel collapsiblePanel = (HtmlCollapsiblePanel)uiComponent;
        String reqValue = (String)facesContext.getExternalContext().getRequestParameterMap().get(HtmlRendererUtils.getHiddenCommandLinkFieldName(HtmlRendererUtils.getFormName(collapsiblePanel, facesContext)));
    		//log.debug("new component's id is " + collapsiblePanel.getClientId(facesContext) + ", req id is " + reqValue);
        if ((collapsiblePanel.getClientId(facesContext) + LINK_ID).equals(reqValue)) collapsiblePanel.setCollapsed(!collapsiblePanel.isCollapsed() );
    }
    
    protected HtmlCommandLink getLink(FacesContext facesContext, HtmlCollapsiblePanel collapsiblePanel)
        throws IOException
    {
        Application application = facesContext.getApplication();
        HtmlCommandLink link = (HtmlCommandLink)application.createComponent(HtmlCommandLink.COMPONENT_TYPE);
        link.setId(collapsiblePanel.getId() + LINK_ID );
        link.setTransient(true);
        link.setImmediate(true);
        //link.addActionListener(new ChangeCollapsedHandler());

        List children = link.getChildren();
				// Create the indicator. You could later make this conditional and render optional images instead 
				HtmlOutputText uiText = (HtmlOutputText)application.createComponent(HtmlOutputText.COMPONENT_TYPE);
				uiText.setTransient(true);
				uiText.setValue(collapsiblePanel.isCollapsed() ? ">" : "ν");
				uiText.setEscape(false);
				uiText.setStyleClass(collapsiblePanel.getStyleClass());
				uiText.setStyle(collapsiblePanel.getStyle());
				children.add(uiText);
				
				// Create the optional label
        String label = collapsiblePanel.getValue();
				if (label != null) {
					uiText = (HtmlOutputText)application.createComponent(HtmlOutputText.COMPONENT_TYPE);
					uiText.setTransient(true);
					uiText.setValue(" " + label);
					uiText.setStyleClass(collapsiblePanel.getStyleClass());
					uiText.setStyle(collapsiblePanel.getStyle());
					children.add(uiText);
				}
				return link;
    }
   
    
    // Couldn't get an ActionListner for a link to work properly. With each page submit, one more
    // event was fired. I assume it is because the link component was set to transparent, and I didn't
    // know how to get a reference to it back in a new encoding phase 
    /*
    public static class ChangeCollapsedHandler implements ActionListener {
    	// Can't make this class anonymous, because it won't work with state saving
    	// refer to http://forum.java.sun.com/thread.jspa?messageID=2885214&#2885214
    	
		  /* (non-Javadoc)
		  * @see javax.faces.event.ActionListener#processAction(javax.faces.event.ActionEvent)
		  */
    /*
      public void processAction(ActionEvent actionEvent) throws AbortProcessingException {
    		log.info("Got action event, processing " + actionEvent.getComponent().getId() + ", phase id " + actionEvent.getPhaseId() );
    		if (!(actionEvent.getComponent().getParent() instanceof HtmlCollapsiblePanel) ) 
    			throw new AbortProcessingException("The parent of the action source was of unexpected type, HtmlCollapsiblePanel was expected");
    		HtmlCollapsiblePanel collapsiblePanel = (HtmlCollapsiblePanel)actionEvent.getComponent().getParent(); 
    		collapsiblePanel.setCollapsed(!collapsiblePanel.isCollapsed() );
        // Note that we need to remove the listeners here, otherwise they will be fired again for old components,
        // don't quite understand why
        ActionListener[] listeners = collapsiblePanel.getLink().getActionListeners();
        for (int i= 0; i< listeners.length; i++) collapsiblePanel.getLink().removeActionListener(listeners[i]);
    	}
		}
    */
}