/*

* 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 "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 javax.microedition.lcdui;

import org.eclipse.swt.graphics.Point;

/**

 * Class representing the Spacer item.

 */

public class Spacer extends Item

{

    /**

     * If Spacer is changed, reasons for Re-layouting.

     */

	static final int UPDATE_MINIMUMSIZE = UPDATE_ITEM_MAX << 1;

    private int minimumWidth = -1;

    private int minimumHeight = -1;

    /**

     * Constructor.

     *

     * @param minW minimum width of the Spacer.

     * @param minH minimum height of the Spacer.

     */

    public Spacer(int minW, int minH)

    {

        setMinimumSize(minW, minH);

    }

    /**

     * Overrides setLabel in Item class.

     *

     * @param newLabel Spacer cannot have any label.

     */

    public void setLabel(String newLabel)

    {

        throw new IllegalStateException(

            MsgRepository.SPACER_EXCEPTION_INVALID_STATE_LABEL);

    }

    /**

     * Overrides method in Item class.

     *

     * @param cmd Spacer cannot have command associated with.

     */

    public void addCommand(Command cmd)

    {

        throw new IllegalStateException(

            MsgRepository.SPACER_EXCEPTION_INVALID_STATE_COMMAND);

    }

    /**

     * Overrides method in Item class.

     *

     * @param newCmd Spacer cannot have command associated with.

     */

    public void setDefaultCommand(Command newCmd)

    {

        throw new IllegalStateException(

            MsgRepository.SPACER_EXCEPTION_INVALID_STATE_COMMAND);

    }

    /**

     * Set minimum size for a spacer.

     *

     * @param minW new minimum width of spacer.

     * @param minH new minimum height of spacer.

     */

    public void setMinimumSize(int minW, int minH)

    {

        if(minW < 0 || minH < 0)

        {

            throw new IllegalArgumentException(

                MsgRepository.SPACER_EXCEPTION_INVALID_WIDTH_HEIGHT);

        }

        else

        {

            int updateReason = Item.UPDATE_NONE;

            if(minW != getMinimumWidth())

            {

                minimumWidth = minW;

                updateReason |= UPDATE_MINIMUMSIZE | UPDATE_SIZE_CHANGED;

            }

            if(minH != getMinimumHeight())

            {

                minimumHeight = minH;

                updateReason |= UPDATE_MINIMUMSIZE | UPDATE_SIZE_CHANGED;

            }

			if(updateReason != Item.UPDATE_NONE)

            {

            	updateParent(updateReason);

			}

        }

    }

    /**

     * Calculates minimum size of this item.

     *

     * @return Minimum size.

     */

    Point calculateMinimumSize()

    {

        return new Point(minimumWidth, minimumHeight);

    }

    /**

     * Calculates preferred size of this item.

     *

     * @return Preferred size.

     */

    Point calculatePreferredSize()

    {

        return new Point(minimumWidth, minimumHeight);

    }

}