/*

* 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 com.nokia.mj.impl.rt.legacy.NativeError;

import com.nokia.mid.ui.CanvasGraphicsItem;

class CanvasGraphicsItemPainter

        extends com.nokia.mid.ui.CanvasGraphicsItemPainter

{

    // Toolkit

    private Toolkit iToolkit;

    // Native handle

    private int iHandle;

    // Graphics

    private Graphics iGraphics;

    //

    // Repainting

    //

    private boolean  iRepaintPending; //waiting for paint to be called

    private int      iRepaintX1;

    private int      iRepaintY1;

    private int      iRepaintX2;

    private int      iRepaintY2;

    private boolean  iPaintEventPending;

    Object iCallbackLock;

    CanvasGraphicsItemPainter(

        CanvasGraphicsItem aItem,

        Object aToolkit,

        int aWidth,

        int aHeight)

    {

        iItem = aItem;

        iToolkit = (Toolkit)aToolkit;

        synchronized (iToolkit)

        {

            iHandle = Toolkit.checkHandle(

                          _createNativePeer(iToolkit.getHandle(), aWidth, aHeight));

            iCallbackLock = iToolkit.getCallbackLock();

        }

        iGraphics = null;

    }

    /**

     * Hidden default constructor.

     */

    protected CanvasGraphicsItemPainter()

    {

    }

    protected void Repaint(int aX, int aY, int aWidth, int aHeight)

    {

        synchronized (iToolkit)

        {

            if (iItem.isVisible() && (aWidth > 0) && (aHeight > 0))

            {

                int x1 = aX;

                int y1 = aY;

                int x2 = aX + aWidth;

                int y2 = aY + aHeight;

                // Union of clip rect and damage rect

                if (iRepaintPending)

                {

                    iRepaintX1 = Math.min(iRepaintX1, x1);

                    iRepaintY1 = Math.min(iRepaintY1, y1);

                    iRepaintX2 = Math.max(iRepaintX2, x2);

                    iRepaintY2 = Math.max(iRepaintY2, y2);

                }

                else

                {

                    iRepaintX1 = x1;

                    iRepaintY1 = y1;

                    iRepaintX2 = x2;

                    iRepaintY2 = y2;

                    iRepaintPending = true;

                }

                // Clip to bounds

                iRepaintX1 = Math.max(iRepaintX1, 0);

                iRepaintY1 = Math.max(iRepaintY1, 0);

                iRepaintX2 = Math.min(iRepaintX2, iItem.getWidth());

                iRepaintY2 = Math.min(iRepaintY2, iItem.getHeight());

                if (!iPaintEventPending)

                {

                    iToolkit.postEvent(this, Toolkit.EVENT_PAINT);

                    iPaintEventPending = true;

                }

            }

        }

    }

    private void paint()

    {

        boolean  clipped;

        int      rx;

        int      ry;

        int      rw;

        int      rh;

        int      width;

        int      height;

        synchronized (iToolkit)

        {

            iPaintEventPending = false;

            if (!iRepaintPending)

            {

                return; // Don't draw if all the repaints have already been done

            }

            iRepaintPending = false;

            if (!iItem.isVisible())

            {

                return;

            }

            rx = iRepaintX1;

            ry = iRepaintY1;

            rw = iRepaintX2 - iRepaintX1;

            rh = iRepaintY2 - iRepaintY1;

            width    = iItem.getWidth();

            height   = iItem.getHeight();

            if (iGraphics == null)

            {

                iGraphics = new Graphics(

                    iToolkit, this, iHandle,

                    iItem.getWidth(), iItem.getHeight());

            }

            iGraphics.reset(width, height);

        }

        clipped = (rw < width) || (rh < height);

        if (clipped)

        {

            iGraphics.setClip(rx, ry, rw, rh);

        }

        _resetFrameBuffer(iToolkit.getHandle(), iHandle,

                          rx, ry, rw, rh);

        synchronized (iCallbackLock)

        {

            Repaint(iGraphics); //this will invoke paint(Graphics) in MIDlet

        }

        synchronized (iToolkit)

        {

            if (clipped)

            {

                iToolkit.sync(getHandle(), rx, ry, rw, rh);

            }

            else

            {

                iToolkit.sync(getHandle());

            }

        }

    }

    public int getHandle()

    {

        if (iHandle <= 0)

        {

            throw new RuntimeException(

                "CanvasGraphicsItemPainter.getHandle(" +

                this +

                ") dead item");

        }

        return iHandle;

    }

    private void handleSizeChanged(int aWidth, int aHeight)

    {

        // We don't need to check here if size was really changed

        // because it is done on native side and event is sent

        // only if size was really changed there

        synchronized (iToolkit)

        {

            DisposeGraphics();

        }

        Repaint(0, 0, iItem.getWidth(), iItem.getHeight());

    }

    /*

     * Method handles callback events from native side.

     * aEvent - id of event, only EVENT_PAINT and EVENT_SIZE_CHANGED are used.

     */

    final void handleEvent(int aEvent, int aData0, int aData1)

    {

        switch (aEvent)

        {

        case Toolkit.EVENT_PAINT:

            paint();

            break;

        case Toolkit.EVENT_SIZE_CHANGED:

            handleSizeChanged(aData0, aData1);

            break;

        case Toolkit.EVET_CANVAS_GRAPHICS_ITEM_REPAINT:

            Repaint(0, 0, iItem.getWidth(), iItem.getHeight());

            break;

        }

    }

    private void DisposeGraphics()

    {

        final Graphics graphics = iGraphics;

        iGraphics = null;

        if (null != graphics)

        {

            graphics.dispose();

        }

    }

    // Native methods

    private native int _createNativePeer(

        int aToolkit,

        int aWidth,

        int aHeight);

    private native int _resetFrameBuffer(

        int aToolkit,

        int aNativePeerHandle,

        int aPositionX,

        int aPositionY,

        int aWidth,

        int aHeight);

}