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.ui.section;

import org.eclipse.jface.util.PropertyChangeEvent;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Event;

import org.eclipse.swt.widgets.Layout;

import org.eclipse.swt.widgets.Listener;

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

import eu.etaxonomy.cdm.api.conversation.ConversationHolder;

import eu.etaxonomy.cdm.api.conversation.IConversationEnabled;

import eu.etaxonomy.cdm.persistence.hibernate.CdmDataChangeMap;

import eu.etaxonomy.taxeditor.model.ImageResources;

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

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

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

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

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

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

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

/**

 * Visualizes an element of type ENTITY in an {@link AbstractEntityCollectionSection}

 *  and links listener functionalities to it.

 *

 *  @param ENTITY the type of the element which is visualized by this class

 *

 * @author n.hoffmann

 * @created Nov 16, 2009

 * @version 1.0

 */

public abstract class AbstractEntityCollectionElement<ENTITY> extends

		AbstractCdmFormElement implements IEntityElement<ENTITY>,

		SelectionListener, IConversationEnabled {

	protected ENTITY entity;

	private final Composite container;

	/**

	 * Composite "around" the actual content. Is used for control action like e.g. remove button

	 */

	private final Composite box;

	private Button btnRemove;

    protected Button btnChooseEntity;

	private Color backgroundColor;

	public AbstractEntityCollectionElement(CdmFormFactory formFactory,

	        AbstractFormSection section, ENTITY entity,

	        SelectionListener removeListener, Color backgroundColor, int style) {

	    this(formFactory, section, entity, removeListener, false, backgroundColor, style);

	}

	public AbstractEntityCollectionElement(CdmFormFactory formFactory,

			AbstractFormSection section, ENTITY entity, SelectionListener removeListener,

			boolean isChoosableEntity, Color backgroundColor, int style) {

		super(formFactory, (ICdmFormElement) section);

		init();

		formFactory.addPropertyChangeListener(this);

		box = formFactory.createComposite(section.getLayoutComposite());

		box.setBackgroundMode(SWT.INHERIT_DEFAULT);

		addControl(box);

		TableWrapLayout boxLayout = LayoutConstants.LAYOUT(4, false);

		boxLayout.topMargin = 4;

		boxLayout.bottomMargin = 4;

		box.setLayout(boxLayout);

		box.setLayoutData(LayoutConstants.FILL_HORIZONTALLY());

		container = formFactory.createComposite(box);

		container.setBackgroundMode(SWT.INHERIT_DEFAULT);

		setLayoutComposite(container);

		addControl(container);

		Layout containerLayout = LayoutConstants.LAYOUT(2, false);

		container.setLayout(containerLayout);

		container.setLayoutData(LayoutConstants.FILL_HORIZONTALLY());

		if(isChoosableEntity){

		    btnChooseEntity = formFactory.createButton(box, null, SWT.PUSH);

		    addControl(btnChooseEntity);

		    btnChooseEntity.setLayoutData(LayoutConstants.RIGHT());

		    btnChooseEntity.setImage(ImageResources.getImage(ImageResources.BROWSE_ICON));

		    btnChooseEntity.setToolTipText("Browse");

		    btnChooseEntity.addListener(SWT.Selection, new Listener() {

		        @Override

		        public void handleEvent(Event event) {

		            ENTITY entity = selectFromDialog();

		            if(entity!=null){

		                if(getParentElement() instanceof AbstractEntityCollectionSection){

		                    ((AbstractEntityCollectionSection)getParentElement()).removeElement(getEntity());

		                    setEntity(entity);

		                    ((AbstractEntityCollectionSection)getParentElement()).addElement(entity);

		                    ((AbstractEntityCollectionSection)getParentElement()).firePropertyChangeEvent(getParentElement());

		                }

		            }

		        }

		    });

		}

		if (removeListener != null) {

			btnRemove = formFactory.createButton(box, null, SWT.PUSH);

			addControl(btnRemove);

			btnRemove.setLayoutData(LayoutConstants.RIGHT());

			btnRemove.setImage(ImageResources

					.getImage(ImageResources.TRASH_ICON));

			btnRemove.setToolTipText("Remove");

			btnRemove.addSelectionListener(removeListener);

		}

		createControls(this, style);

		setEntity(entity);

	}

	/**

	 * Init gets executed before any other setup of the section takes place

	 *

	 * Implement this if you want to configure the section

	 */

	public void init() {

		// default implementation is empty

	}

	public abstract void setEntity(ENTITY entity);

	@Override

    public ENTITY getEntity() {

		return entity;

	}

	/**

	 * Sub classes should override to provide the functionality to choose the

	 * entity from existing ones from the data source.<br>

	 * <b>Note:</b> to enable this functionality sub classes have to set

	 * the corresponding flag in the super constructor

	 * @return an existing entity from the data source

	 */

	protected ENTITY selectFromDialog(){

	    return null;

	}

	public abstract void createControls(ICdmFormElement element, int style);

	/**

	 * Mark <code>this</code> element as selected.

	 */

	@Override

    public void setSelected(boolean selected) {

		for (ICdmFormElement element : getElements()) {

			if (element instanceof ISelectable) {

				((ISelectable) element).setSelected(selected);

			}

		}

		setBackground(selected ? SELECTED : getPersistentBackground());

	}

	/** {@inheritDoc} */

	@Override

	public void propertyChange(PropertyChangeEvent event) {

		if (event == null) {

			return;

		}

		Object eventSource = event.getSource();

		if (getElements().contains(eventSource) || getControls().contains(eventSource)) {

			handleEvent(eventSource);

		}

	}

	public abstract void handleEvent(Object eventSource);

	/** {@inheritDoc} */

	@Override

    public void setBackground(Color color) {

		backgroundColor = color;

		super.setBackground(color);

		box.setBackground(color);

		container.setBackground(color);

	}

	/**

	 * {@inheritDoc}

	 *

	 * React when selection occurs

	 */

	@Override

    public void widgetSelected(SelectionEvent e) {

	}

	/** {@inheritDoc} */

	@Override

    public void widgetDefaultSelected(SelectionEvent e) {

	}

	/** {@inheritDoc} */

	@Override

	public Composite getLayoutComposite() {

		return container;

	}

	public Color getBackgroundColor() {

		return backgroundColor;

	}

    public Composite getBox() {

        return box;

    }

	@Override

    public ConversationHolder getConversationHolder() {

		if (getParentElement() instanceof IConversationEnabled) {

			return ((IConversationEnabled) getParentElement())

					.getConversationHolder();

		}

		throw new IllegalArgumentException(

				"Parent element should be IConversationEnabled");

	}

	/** {@inheritDoc} */

	@Override

    public void update(CdmDataChangeMap changeEvents) {

	}

}