/*

* 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.events.*;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.ScrollBar;

/**

 * Implementation of <code>ScrolledComposite</code> control.

 */

class ScrolledComposite extends Composite implements FocusListener,

    ControlListener

{

    private ScrollBar vBar;

    /**

     * Constructor.

     *

     * @param parent

     * @param style

     */

    public ScrolledComposite(Composite parent, int style)

    {

        super(parent, style);

        vBar = parent.getVerticalBar();

        if(vBar != null)

        {

            vBar.addSelectionListener(new ScrollBarListener());

        }

        // addKeyListener(new ScrollKeyListener());

        addTraverseListener(new ScrollTraverseListener());

        addControlListener(new ScrollControlListener());

    }

    /**

     * Set the position of this Composite relative to its parent.

     *

     * @param x X-coordinate

     * @param y Y-coordinate

     */

    void setOrigin(int x, int y, boolean keyNavigation)

    {

        //setRedraw(false);

        if(vBar != null)

        {

            if(keyNavigation)

            {

                vBar.setSelection(y);

            }

            y = -vBar.getSelection();

        }

        else

        {

            y = 0;

        }

        this.setLocation(x, y);

        //setRedraw(true);

    }

    /**

     * Updates range and thumb size of the ScrollBars.

     */

    void updateScrollbar(int height)

    {

        Rectangle clientArea = getParent().getClientArea();

        if(vBar != null)

        {

            vBar.setMinimum(0);

            vBar.setMaximum(height);

            vBar.setThumb(clientArea.height);

        }

    }

    private class ScrollBarListener implements SelectionListener

    {

        public void widgetDefaultSelected(SelectionEvent e)

        {

            Logger.verbose(e.toString());

        }

        public void widgetSelected(SelectionEvent e)

        {

            Logger.verbose(e.toString());

        }

    }

    private class ScrollKeyListener implements KeyListener

    {

        public void keyPressed(KeyEvent e)

        {

            Logger.verbose(e.toString());

        }

        public void keyReleased(KeyEvent e)

        {

            Logger.verbose(e.toString());

        }

    }

    private class ScrollTraverseListener implements TraverseListener

    {

        public void keyTraversed(TraverseEvent e)

        {

        }

    }

    private class ScrollControlListener implements ControlListener

    {

        public void controlMoved(ControlEvent e)

        {

        }

        public void controlResized(ControlEvent e)

        {

        }

    }

    public void focusGained(FocusEvent e)

    {

        // makeVisible((Control) e.widget);

    }

    public void focusLost(FocusEvent e)

    {

    }

    public void controlMoved(ControlEvent e)

    {

        updateScrollbar(0);

    }

    public void controlResized(ControlEvent e)

    {

        updateScrollbar(0);

    }

}