Re: BImage ?

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By the way, here is my BImage component.

Just beware of the package structure... Maybe it could be included in a 
contrib package, or even in the core ? (this code is not much of a 
revolution :)


Regards,
Franck



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/*
 * HTMLImageRenderer.java
 *
 * Created on 9 dec 2006
 * Copyright (c) 2006 mecadu.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.mecadu.core.pres.comp.renderer.html;

import org.apache.log4j.Logger;
import org.barracudamvc.core.comp.BComponent;
import org.barracudamvc.core.comp.NoSuitableRendererException;
import org.barracudamvc.core.comp.RenderException;
import org.barracudamvc.core.comp.UnsupportedFormatException;
import org.barracudamvc.core.comp.View;
import org.barracudamvc.core.comp.ViewContext;
import org.barracudamvc.core.comp.renderer.html.HTMLComponentRenderer;
import org.mecadu.core.pres.comp.BImage;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.html.HTMLImageElement;

/**
 * This class handles the default rendering of image into an HTML view.
 */
public class HTMLImageRenderer extends HTMLComponentRenderer {

    protected static final Logger logger = Logger.getLogger(HTMLImageRenderer.class.getName());

    
    public Node createDefaultNode(Document doc, BComponent comp, ViewContext vc) throws UnsupportedFormatException {
        
    	if (vc.getTemplateNode() instanceof HTMLImageElement) {
            return super.createDefaultNode(doc, comp, vc);
        }
        
        Node defaultNode = doc.createElement("IMG");
        if (logger.isInfoEnabled()) logger.info("Creating default node:"+defaultNode);
        return defaultNode;
    }

    /**
     * 
     */
    public void renderComponent(BComponent comp, View view, ViewContext vc) throws RenderException {
        //make sure the component is an image component
        if (!(comp instanceof BImage))
        	throw new NoSuitableRendererException("This renderer can only render BImage components");

        //show what we're doing
        showNodeInterfaces(view, logger);

        //first, allow the parent class to do anything it needs to
        super.renderComponent(comp, view, vc);

        BImage bimage = (BImage) comp;
        String alt = bimage.getAlt();
        String title = bimage.getTitle();
        String url = bimage.getUrl();
        String height = bimage.getHeight();
        String width = bimage.getWidth();
        
        Node node = view.getNode();
        
        //HTMLElement Interface
        //---------------------
        //Supported Elements:
        //..HTMLImageElement
        if (node instanceof HTMLImageElement) {
            if (logger.isInfoEnabled()) logger.info("Rendering based on HTMLImageElement interface...");
            ((HTMLImageElement) node).setAlt(alt);
            ((HTMLImageElement) node).setTitle(title); 
            ((HTMLImageElement) node).setSrc(url);
            ((HTMLImageElement) node).setHeight(height);
            ((HTMLImageElement) node).setWidth(width);
        } else {
            String errmsg = "Node does not implement HTMLImageElement and cannot be rendered: "+node;
            logger.warn(errmsg);
            throw new NoSuitableRendererException(errmsg);
        }
    }
}

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/*
 * HTMLImageRenderer.java
 *
 * Created on 9 dec 2006
 * Copyright (c) 2006 mecadu.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.mecadu.core.pres.comp;

import org.apache.log4j.Logger;
import org.barracudamvc.core.comp.BComponent;
import org.barracudamvc.core.comp.ViewContext;
import org.barracudamvc.core.comp.renderer.Renderer;
import org.barracudamvc.core.comp.renderer.RendererFactory;
import org.mecadu.core.pres.comp.renderer.html.HTMLImageRenderer;
import org.w3c.dom.html.HTMLElement;

public class BImage extends BComponent {

    //public vars
    protected static final Logger logger = Logger.getLogger(BImage.class.getName());
    
    //private vars
    protected String alt = "no alt text";
    protected String title = null;
    protected String url = null;
    protected String width = null;
    protected String height = null;
    

    //--------------- Constructors -------------------------------
    /**
     * Public noargs constructor
     */
    public BImage() {}
    
    /**
     * Public constructor which creates the component and sets the text, 
     * and target values. This link will fire the default action event (unless
     * you manually specify an action). 
     *
     * @param itext the text string that backs this component
     */
    public BImage(String ialt, String iurl) {
        
    	setAlt(ialt);
        setUrl(iurl);
        
        // Let strict spec compliant engines (ie Gecko)
        // display alt text on mouse over
        setTitle(ialt);
    }
    
    /**
     * Public constructor which creates the component and sets the text, 
     * and target values. This link will fire the default action event (unless
     * you manually specify an action). 
     *
     * @param itext the text string that backs this component
     */
    public BImage(String ialt, String ititle, String iurl) {
        setAlt(ialt);
        setTitle(ititle);
        setUrl(iurl);
    }
    
    /**
     * Public constructor which creates the component and sets the text, 
     * and target values. This link will fire the default action event (unless
     * you manually specify an action). 
     *
     * @param itext the text string that backs this component
     */
    public BImage(String ialt, String iurl, String iheight, String iwidth) {
        setAlt(ialt);
        setUrl(iurl);
        setHeight(iheight);
        setWidth(iwidth);
        
        // Let strict spec compliant engines (ie Gecko)
        // display alt text on mouse over
        setTitle(ialt);
    }
    
    /**
     * Public constructor which creates the component and sets the text, 
     * and target values. This link will fire the default action event (unless
     * you manually specify an action). 
     *
     * @param itext the text string that backs this component
     */
    public BImage(String ialt, String ititle, String iurl, String iheight, String iwidth) {
        setAlt(ialt);
        setTitle(ititle);
        setUrl(iurl);
        setHeight(iheight);
        setWidth(iwidth);
    }
    


    //--------------- Renderer -----------------------------------
    /**
     * Default component renderer factory registrations
     */
    static {
        HTMLRendererFactory rfHTML = new HTMLRendererFactory();
        installRendererFactory(rfHTML, BImage.class, HTMLElement.class);
    }

    /**
     * HTML RendererFactory
     */
    static class HTMLRendererFactory implements RendererFactory {
        public Renderer getInstance() {return new HTMLImageRenderer();}
    }



    //--------------- BImage --------------------------------------
    /**
     * Set the text for this particular component
     *
     * @param itext the text representation of this component
     */
    public BImage setAlt(String itext) {
        alt = itext;
        invalidate();
        return this;
    }
    
    /**
     * Get the text for this particular component
     *
     * @return the text for this particular component
     */
    public String getAlt() {
        return alt;    
    }
    
    /**
     * Set the text for this particular component
     *
     * @param itext the text representation of this component
     */
    public BImage setTitle(String itext) {
        title = itext;
        invalidate();
        return this;
    }
    
    /**
     * Get the text for this particular component
     *
     * @return the text for this particular component
     */
    public String getTitle() {
        return title;    
    }
    
    /**
     * Set the target for this particular component
     *
     * @param itarget the ext representation of the target
     */
    public BImage setUrl(String iurl) {
        url = iurl;
        invalidate();
        return this;
    }
    
    /**
     * Get the target for this particular component
     *
     * @return the target for this particular component
     */
    public String getUrl() {
        return url;    
    }
    
    /**
     * Set the target for this particular component
     *
     * @param itarget the ext representation of the target
     */
    public BImage setHeight(String iheight) {
        height = iheight;
        invalidate();
        return this;
    }
    
    /**
     * Get the target for this particular component
     *
     * @return the target for this particular component
     */
    public String getHeight() {
        return height;    
    }
    
    /**
     * Set the target for this particular component
     *
     * @param itarget the ext representation of the target
     */
    public BImage setWidth(String iwidth) {
        width = iwidth;
        invalidate();
        return this;
    }
    
    /**
     * Get the target for this particular component
     *
     * @return the target for this particular component
     */
    public String getWidth() {
        return width;    
    }

    /**
     * if has vc, but no views: render as an <a> link, otherwise use
     * super.toString(ViewContext)
     * 
     * @see super#toString(ViewContext)
     */
    public String toString(ViewContext vc) {
        //csc_122205_1 - added (jrk_122505_01 moved from AbstractBComponent to here)
        //if the component HAS a view context, but DOESN'T have any views, then
        //render as a link (this shouldn't break anything, since when TemplateHelper
        //gets a component back it creates a view for it. Basically, this allows
        //us to inline BLinks even when we are not using DOMs. A _better_ way of 
        //doing this would be to modify the renderer to work w/ out a dom, but
        //that's probably easier said then done. So for now, we'll go w/ this.
        if (vc != null && !hasViews()) {
           return this.getAlt();
        } else {
            return super.toString(vc);
        }
    }

}
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