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.view;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.forms.IFormPart;

import org.eclipse.ui.forms.ManagedForm;

import org.eclipse.ui.forms.events.ExpansionEvent;

import org.eclipse.ui.forms.events.IExpansionListener;

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

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

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.preference.PreferencesUtil;

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

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

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

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

import eu.etaxonomy.taxeditor.view.detail.CdmSectionPart;

/**

 * @author n.hoffmann

 * @created Feb 9, 2010

 * @version 1.0

 */

public abstract class AbstractCdmDataViewer extends Viewer implements IConversationEnabled{

	protected ManagedForm managedForm;

	protected CdmFormFactory formFactory;

	protected ScrolledForm scrolledForm;

	private final Composite body;

	protected RootElement rootElement;

	//TODO: create a super class for this?

	private Object input;

	private final AbstractCdmViewPart viewPart;

	public AbstractCdmDataViewer(Composite parent, AbstractCdmViewPart viewPart) {

		this.viewPart = viewPart;

		managedForm = new ManagedForm(parent){

			@Override

			public void dirtyStateChanged() {

				markViewPartDirty();

			}

		};

		createFormFactory();

		scrolledForm = managedForm.getForm();

		body = scrolledForm.getBody();

		body.setLayout(LayoutConstants.LAYOUT());

		rootElement = new RootElement(formFactory, body);

	}

	protected void createFormFactory() {

		if(formFactory != null){

			formFactory.dispose();

			formFactory = null;

		}

		formFactory = new CdmFormFactory(Display.getCurrent(), this);

	}

	protected void markViewPartDirty(){

		viewPart.changed(input);

	}

	protected AbstractCdmViewPart getViewPart() {

		return viewPart;

	}

	/** {@inheritDoc} */

	@Override

	public Control getControl() {

		if(body.isDisposed()){

			return null;

		}

		for(Control child : body.getChildren()){

			return child;

		}

		return body;

	}

	/** {@inheritDoc} */

	@Override

	public void setInput(Object input) {

		this.input = input;

		// reset selection

		setSelection(new StructuredSelection(input));

		refresh();

	}

	/** {@inheritDoc} */

	@Override

	public Object getInput() {

		return input;

	}

	/** {@inheritDoc} */

	@Override

	public void refresh() {

		showParts();

		managedForm.setInput(input);

		managedForm.refresh();

		managedForm.reflow(true);

	}

	public void layout(){

		body.layout();

	}

	protected abstract void showParts();

	protected void destroySections() {

		for (IFormPart formPart : managedForm.getParts()){

			removePart((CdmSectionPart<?>) formPart);

		}

		managedForm.setInput(null);

		formFactory.destroyElement(rootElement);

		createFormFactory();

		rootElement = new RootElement(formFactory, body);

		for(Control control : body.getChildren()){

			control.dispose();

			control = null;

		}

	}

	public void setFocus(){

		// we have to set focus to a control of this viewer

		// otherwise, after opening a dialog from the details, the focus will not be

		// given back to the details view but to the editor

		for(Control child : body.getChildren()){

			child.setFocus();

			break;

		}

	}

	public void reflow(){

		managedForm.reflow(true);

	}

	protected void removePart(CdmSectionPart<?> sectionPart){

		managedForm.removePart(sectionPart);

		formFactory.removePropertyChangeListener(sectionPart);

	}

	protected void addPart(AbstractFormSection<?> section, boolean isDefaultExpanded){

		CdmSectionPart<?> sectionPart = new CdmSectionPart<>(section);

		managedForm.addPart(sectionPart);

		formFactory.addPropertyChangeListener(sectionPart);

		PreferencesUtil.getPreferenceStore().setDefault(section.getClass().getCanonicalName()+";"+getInput().getClass().getCanonicalName(), isDefaultExpanded);

		section.setExpanded(PreferencesUtil.getPreferenceStore().getBoolean(section.getClass().getCanonicalName()+";"+getInput().getClass().getCanonicalName()));

		section.addExpansionListener(new ExpandListener(section));

	}

	@Override

    public ConversationHolder getConversationHolder() {

		return viewPart.getConversationHolder();

	}

	/** {@inheritDoc} */

	@Override

    public void update(CdmDataChangeMap changeEvents) {}

    private class ExpandListener implements IExpansionListener{

    	private Section section;

		public ExpandListener(Section section) {

			super();

			this.section = section;

		}

		@Override

		public void expansionStateChanging(ExpansionEvent e) {

		}

		@Override

		public void expansionStateChanged(ExpansionEvent e) {

			PreferencesUtil.getPreferenceStore().setValue(section.getClass().getCanonicalName()+";"+getInput().getClass().getCanonicalName(), e.getState());

		}

    }

}