/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.cpp.internal.api.utils.ui;

import org.eclipse.jface.viewers.ComboBoxCellEditor;

import org.eclipse.jface.viewers.ILabelProvider;

import org.eclipse.swt.SWT;

import org.eclipse.swt.widgets.Composite;

import java.util.*;

/**

 * This is a cell editor that manages a list of model objects

 * whose strings are provided through an ILabelProvider.  It is

 * read only so items cannot be typed in.

 * <p>

 * Use instead of EMF's ExtendedComboBoxCellEditor which is overloaded

 * with buggy features that make it hard to use.

 *

 */

public class ModelObjectComboBoxCellEditor extends ComboBoxCellEditor {

	protected List<?> modelItems;

	public ModelObjectComboBoxCellEditor(Composite parent,

			List<?> items,

			ILabelProvider labelProvider) {

		super(parent, getItemStrings(items, labelProvider), SWT.READ_ONLY);

		this.modelItems = items;

	}

	public static String[] getItemStrings(List<?> items, ILabelProvider labelProvider) {

		String[] array = new String[items.size()];

		int i = 0;

		for (Object obj : items) {

			array[i++] = labelProvider.getText(obj); 

		}

		return array;

	}

	@Override

	protected Object doGetValue() {

		Object value = super.doGetValue();

		if (value instanceof Number) {

			// look up model at index

			int index = ((Number) value).intValue();

			if (index < 0)

				return null;

			value = modelItems.get(index);

		}

		return value;

	}

	@Override

	protected void doSetValue(Object value) {

		// look up the model object to reestablish index

		int index = modelItems.indexOf(value);

		if (index != -1) {

			super.doSetValue(index);

		}

	}

	public void setModelItems(List<?> items, ILabelProvider labelProvider) {

		setItems(getItemStrings(items, labelProvider));

		this.modelItems = items;

	}

}