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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.widget;
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import com.tirsen.angkor.Debug;
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import com.tirsen.angkor.RenderContext;
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import com.tirsen.angkor.View;
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import com.tirsen.angkor.event.Action;
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import com.tirsen.angkor.event.ActionListener;
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import com.tirsen.angkor.event.ActionSource;
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import com.tirsen.angkor.event.ActionSourceHelper;
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import org.apache.log4j.Category;
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import java.io.IOException;
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/**
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* @author $Author: tirsen $
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* @version $Revision: 1.5 $
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* <BR>
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* $Id: Link.java,v 1.5 2002/10/09 21:37:37 tirsen Exp $
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*/
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public class Link extends Container implements ActionSource
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{
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private static final Category logger = Category.getInstance(Debug.LOGGER_NAME);
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private ActionSourceHelper actionSourceHelper = new ActionSourceHelper(this);
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public static Link createActionLink(final Action action)
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{
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TextLabel name = new TextLabel();
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name.setModel(new ReadOnlyValueModel()
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{
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public Object getValue()
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{
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return action.getValue(Action.NAME);
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}
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});
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return createActionLink(action, name);
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}
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public static Link createActionLink(Action action, View content)
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{
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Link link = new Link();
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link.setAction(action);
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link.add(content);
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return link;
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}
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public Action getAction()
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{
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return actionSourceHelper.getAction();
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}
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public void setAction(Action action)
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{
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actionSourceHelper.setAction(action);
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}
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public void addActionListener(ActionListener listener)
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{
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actionSourceHelper.addActionListener(listener);
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}
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public void removeActionListener(ActionListener listener)
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{
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actionSourceHelper.removeActionListener(listener);
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}
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public void signalActionEvent()
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{
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actionSourceHelper.signalActionEvent();
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}
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public boolean isParsing()
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{
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return true;
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}
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private boolean isEnabled()
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{
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return getAction() != null && getAction().isEnabled();
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}
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public void render(RenderContext context) throws IOException
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{
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if (isVisible())
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{
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if (!isEnabled())
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{
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// render as disabled
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context.startTag("SPAN id=\"" + uniqueId(context) + "\"");
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renderChildren(context);
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context.endTag("SPAN");
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}
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else
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{
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String url = context.requestURL(uniqueId(context) + "=clicked");
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context.startTag("A id=\"" + uniqueId(context) + "\" href=\"" + url + "\"");
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renderChildren(context);
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context.endTag("A");
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context.registerParsingComponent(this);
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}
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context.println(" ");
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}
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}
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public void parse(RenderContext context)
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{
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super.parse(context);
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if (context.getRequestParameter(getId()) != null)
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{
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logger.debug("signalling event");
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actionSourceHelper.signalActionEvent(context);
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}
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}
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public static Link createImageStyle(Action action)
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{
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Image removeImage = new Image();
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removeImage.setSourceURL((String) action.getValue(Action.IMAGE_URL));
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removeImage.setAlt((String) action.getValue(Action.DESCRIPTION));
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return createActionLink(action, removeImage);
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}
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}
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