/*******************************************************************************
 * Copyright (c) 2008, 2013 Obeo.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.eef.runtime.ui.widgets;

import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.eef.runtime.ui.utils.EditingUtils;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Link;

/**
 * AdvancedEObjectFlatComboViewer with a link to set the element properties.
 * 
 * @author <a href="mailto:nathalie.lepine@obeo.fr">Nathalie L�pine</a>
 */
public class LinkEObjectFlatComboViewer extends AbstractAdvancedEObjectFlatComboViewer {

	/** Associated link. */
	protected Link valueLink;
	
	/**
	 * Constructor from super class
	 * 
	 * @param dialogTitle
	 * @param input Object
	 * @param filter ViewerFilter
	 * @param adapterFactory AdapterFactory
	 * @param callback EObjectFlatComboViewerListener
	 */
	public LinkEObjectFlatComboViewer(String dialogTitle, Object input,
			ViewerFilter filter, AdapterFactory adapterFactory,
			EObjectFlatComboViewerListener callback) {
		super(dialogTitle, input, filter, adapterFactory, callback);
	}

	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#createLabels(org.eclipse.swt.widgets.Composite)
	 */
	protected void createLabels(Composite parent) {
		String value = UNDEFINED_VALUE;
		if (selection != null) {
			value = labelProvider.getText(selection);
		}
		this.valueLink = createLink(parent, value, SWT.NONE);
		FormData data = new FormData();
		data.left = new FormAttachment(0, 0);
		data.right = new FormAttachment(browseButton, 0);
		data.top = new FormAttachment(0, 4);
		valueLink.setLayoutData(data); 
		valueLink.addSelectionListener(new SelectionAdapter() {
			/** (non-Javadoc)
			 * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent)
			 */
			public void widgetSelected(SelectionEvent e) {
				EObject editedElement = getSelection();
				handleEdit(editedElement);
			}
		});
	}

	/**
	 * @param parent Composite
	 * @param value String
	 * @param style
	 * @return the created Link
	 */
	private Link createLink(Composite parent, String value, int style) {
		Link link = new Link(parent, style);
		link.setText(value);
		EditingUtils.setEEFtype(field, "eef::LinkEObjectFlatComboViewer::link");
		return link;
	}

	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#setSelection(org.eclipse.jface.viewers.ISelection)
	 */
	public void setSelection(ISelection selection) {
		if (selection instanceof StructuredSelection) {
			StructuredSelection structuredSelection = (StructuredSelection) selection;
			if (!structuredSelection.isEmpty()
					&& !"".equals(structuredSelection.getFirstElement())) {
				setSelection((EObject) structuredSelection.getFirstElement());
			} else {
				this.valueLink.setText(UNDEFINED_VALUE);
			}
		}
	}

	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#setSelection(org.eclipse.emf.ecore.EObject)
	 */
	public void setSelection(EObject selection) {
		this.selection = selection;
		String text = labelProvider.getText(selection);
		if ("".equals(text)) //$NON-NLS-1$
			this.valueLink.setText(UNDEFINED_VALUE);
		else
			this.valueLink.setText("<a>" + text + "</a>");
	}
	
	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#setID(java.lang.Object)
	 */
	public void setID(Object id) {
		super.setID(id);
		EditingUtils.setID(valueLink, id);
	}

	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#setEnabled(boolean)
	 */
	public void setEnabled(boolean enabled) {
		super.setEnabled(enabled);
		valueLink.setEnabled(enabled);
	}
	
	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#isEnabled()
	 */
	public boolean isEnabled() {
		return super.isEnabled() && valueLink.isEnabled();
	}

	/** (non-Javadoc)
	 * @see org.eclipse.emf.eef.runtime.ui.widgets.AbstractAdvancedEObjectFlatComboViewer#setToolTipText(java.lang.String)
	 */
	public void setToolTipText(String tooltip) {
		super.setToolTipText(tooltip);
		valueLink.setToolTipText(tooltip);
	}

}