EDIT

// $Id$

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy 

* http://www.e-taxonomy.eu

* 

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.forms;

import java.io.IOException;

import java.io.InputStream;

import java.net.URI;

import java.util.HashMap;

import java.util.Map;

import org.apache.http.HttpEntity;

import org.apache.http.HttpException;

import org.apache.http.HttpResponse;

import org.apache.log4j.Logger;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Status;

import org.eclipse.core.runtime.jobs.Job;

import org.eclipse.swt.events.ControlEvent;

import org.eclipse.swt.events.ControlListener;

import org.eclipse.swt.events.PaintEvent;

import org.eclipse.swt.events.PaintListener;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.forms.widgets.TableWrapData;

import eu.etaxonomy.cdm.common.UriUtils;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

/**

 * <p>ImageElement class.</p>

 *

 * @author n.hoffmann

 * @created Sep 24, 2010

 * @version 1.0

 */

public class ImageElement extends AbstractCdmFormElement implements PaintListener, ControlListener{

	private static final Logger logger = Logger.getLogger(ImageElement.class);

	private URI imageUri;

	private Image image;

	private Rectangle imageMaxBounds;

	private Composite container;

	/**

	 * <p>Constructor for ImageElement.</p>

	 *

	 * @param formFactory a {@link eu.etaxonomy.taxeditor.forms.CdmFormFactory} object.

	 * @param parentElement a {@link eu.etaxonomy.taxeditor.forms.ICdmFormElement} object.

	 * @param imageUri a {@link java.net.URI} object.

	 * @param style a int.

	 */

	protected ImageElement(CdmFormFactory formFactory, ICdmFormElement parentElement, URI imageUri, int style) {

		super(formFactory, parentElement);

		setImageUri(imageUri);

		container = new Composite(getLayoutComposite(), style);

		container.setLayoutData(CdmFormFactory.FILL(2, 1));

		container.addControlListener(this);

		container.addPaintListener(this);

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.forms.ISelectable#setSelected(boolean)

	 */

	/** {@inheritDoc} */

	@Override

	public void setSelected(boolean selected) {

		// TODO Auto-generated method stub

	}

	/**

	 * <p>Setter for the field <code>imageUri</code>.</p>

	 *

	 * @param uri a {@link java.net.URI} object.

	 */

	public void setImageUri(URI uri) {

		this.imageUri = uri;

		logger.warn("Setting image uri" + imageUri);

		if(imageUri != null){

			final Display display = Display.getCurrent();

			Job job = new Job("Loading image: " + imageUri){

				@Override

				protected IStatus run(IProgressMonitor monitor) {

					try {						

						InputStream imageStream = UriUtils.getInputStream(imageUri);

						image = new Image(Display.getCurrent(), imageStream);

						display.asyncExec(new Runnable(){

							@Override

							public void run() {

//								EditorUtil.reflowDetailsViewer();

								getLayoutComposite().layout();

							}

						});

						return Status.OK_STATUS;

					}catch (IOException e) {

						logger.error("Error reading image", e);

					} catch (HttpException e) {

						// TODO Auto-generated catch block

						e.printStackTrace();

					} 

					return Status.CANCEL_STATUS;

				}					

			};

			job.schedule();

		}

	}

	private void calculateImageBounds(){

		Rectangle imageBounds = image.getBounds();

		Rectangle containerBounds = container.getBounds();

		Integer imgWidth = imageBounds.width;

		Integer imgHeight = imageBounds.height;

		Float ratio = imgHeight.floatValue()/imgWidth.floatValue();

		Integer width = containerBounds.width;

		Float height = width * ratio;

		imageMaxBounds = new Rectangle(containerBounds.x, containerBounds.y, width, height.intValue());

	}

	/**

	 * <p>Getter for the field <code>imageUri</code>.</p>

	 *

	 * @return the imageUri

	 */

	public URI getImageUri() {

		return imageUri;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.swt.events.PaintListener#paintControl(org.eclipse.swt.events.PaintEvent)

	 */

	/** {@inheritDoc} */

	@Override

	public void paintControl(PaintEvent e) {

		if(image != null){

			calculateImageBounds();

			Composite composite = (Composite) e.widget;

			TableWrapData layoutData = CdmFormFactory.FILL(2, 1);

			layoutData.heightHint = imageMaxBounds.height;

			composite.setLayoutData(layoutData);

			e.gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, 0, 0, imageMaxBounds.width, imageMaxBounds.height);

		}		

	}

	/* (non-Javadoc)

	 * @see org.eclipse.swt.events.ControlListener#controlMoved(org.eclipse.swt.events.ControlEvent)

	 */

	/** {@inheritDoc} */

	@Override

	public void controlMoved(ControlEvent e) {

		// TODO Auto-generated method stub

	}

	/* (non-Javadoc)

	 * @see org.eclipse.swt.events.ControlListener#controlResized(org.eclipse.swt.events.ControlEvent)

	 */

	/** {@inheritDoc} */

	@Override

	public void controlResized(ControlEvent e) {

//		EditorUtil.reflowDetailsViewer();

	}

}