EDIT

/**

* 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.ui.section.media;

import java.net.URI;

import org.apache.commons.io.FileUtils;

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.SelectionListener;

import eu.etaxonomy.cdm.common.media.ImageInfo;

import eu.etaxonomy.cdm.model.media.ImageFile;

import eu.etaxonomy.taxeditor.store.StoreUtil;

import eu.etaxonomy.taxeditor.ui.element.AbstractFormSection;

import eu.etaxonomy.taxeditor.ui.element.CdmFormFactory;

import eu.etaxonomy.taxeditor.ui.element.CdmPropertyChangeEvent;

import eu.etaxonomy.taxeditor.ui.element.ICdmFormElement;

import eu.etaxonomy.taxeditor.ui.element.ImageElement;

import eu.etaxonomy.taxeditor.ui.element.KeyValueViewerElement;

import eu.etaxonomy.taxeditor.ui.element.NumberWithLabelElement;

/**

 * @author n.hoffmann

 * @created Mar 26, 2010

 */

public class ImageFileElement extends MediaRepresentationPartElement<ImageFile> {

    private final class LoadImageJob extends Job{

        private URI uri;

        private boolean updateDimensions;

        public LoadImageJob(URI uri, boolean updateDimensions) {

            super("Load image");

            this.uri = uri;

            this.updateDimensions = updateDimensions;

        }

        @Override

        protected IStatus run(IProgressMonitor monitor) {

            try{

                ImageInfo imageInfo = ImageInfo.NewInstanceWithMetaData(uri, 10000);

                ImageFileElement.this.getLayoutComposite().getDisplay().asyncExec(()->{

                    element_keyValue.setInput(imageInfo.getMetaData());

                    try {

                        disposeImage();

                        element_image = formFactory.createImageElement(parentFormElement, uri, style);

                        element_image.initImageUri(uri);

                    } catch (Exception e) {

                        handleException();

                    }

                    element_image.loadImage();

                    if(uri == null){

                        return;

                    }

                    if(updateDimensions){

                        text_size.setText(FileUtils.byteCountToDisplaySize(imageInfo.getLength()));

                        // KLUDGE this is not save for very large files, because of the int cast.

                        // But then, I don't think we will handle such large files in the near future

                        getEntity().setSize((int) imageInfo.getLength());

                        text_height.setNumber(imageInfo.getHeight());

                        getEntity().setHeight(imageInfo.getHeight());

                        text_width.setNumber(imageInfo.getWidth());

                        getEntity().setWidth(imageInfo.getWidth());

                    }

                    StoreUtil.reflowParentScrolledForm(getLayoutComposite(), true);

                });

            }

            catch (Exception e) {

                handleException();

            }

            return Status.OK_STATUS;

        }

    }

	private NumberWithLabelElement text_height;

	private NumberWithLabelElement text_width;

	private KeyValueViewerElement element_keyValue;

	private ImageElement element_image;

    private ICdmFormElement parentFormElement;

    private int style;

	public ImageFileElement(CdmFormFactory cdmFormFactory,

			AbstractFormSection section, ImageFile element,

			SelectionListener removeListener, int style) {

		super(cdmFormFactory, section, element, removeListener, style);

	}

	@Override

	public void createControls(ICdmFormElement formElement, int style) {

		super.createControls(formElement, style);

        this.parentFormElement = formElement;

        this.style = style;

		text_height = formFactory.createFloatTextWithLabelElement(formElement, "Height", null, style);

		text_height.setEnabled(false);

		text_width = formFactory.createFloatTextWithLabelElement(formElement, "Width", null, style);

		text_width.setEnabled(false);

		element_keyValue = formFactory.createKeyValueViewerElement(formElement, "Key", "Value", null);

	}

	@Override

	public void setEntity(ImageFile entity) {

		super.setEntity(entity);

		text_height.setNumber(entity.getHeight());

		text_width.setNumber(entity.getWidth());

		try {

            new LoadImageJob(getEntity().getUri(), true).schedule();

		} catch (Exception e) {

		    e.printStackTrace();

			handleException();

		}

	}

	@Override

	public void handleEvent(Object eventSource) {

		if(eventSource == text_uri){

			try {

			    URI uri = text_uri.parseText();

				getEntity().setUri(uri);

				if(uri==null){

				    //buffer URI if parsing error occurred

				    MediaDetailElement parentMediaDetailElement = getParentMediaDetailElement();

				    if(parentMediaDetailElement!=null){

				        parentMediaDetailElement.setUriBuffer(text_uri.getText());

				    }

				}

				new LoadImageJob(getEntity().getUri(), true).schedule();

				firePropertyChangeEvent(new CdmPropertyChangeEvent(this, null));

			} catch (Exception e) {

				handleException();

			} finally {

				firePropertyChangeEvent(this);

			}

		}

	}

	protected void handleException() {

	    if(!getLayoutComposite().isDisposed()){

	        getLayoutComposite().getDisplay().asyncExec(()->{

	            disposeImage();

	            StoreUtil.reflowParentScrolledForm(getLayoutComposite(), true);

	        });

	    }

	}

    private void disposeImage(){

        if(element_image!=null){

            element_image.dispose();

            element_image = null;

        }

    }

}