/*

* 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 javax.microedition.lcdui.EventDispatcher.LCDUIEvent;

import org.eclipse.swt.graphics.Point;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.internal.extension.CanvasExtension;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Scrollable;

/**

 * Implementation of LCDUI abstract <code>CustomItem</code> class.

 */

public abstract class CustomItem extends Item

{

    protected static final int NONE = 0;

    protected static final int TRAVERSE_HORIZONTAL = 1;

    protected static final int TRAVERSE_VERTICAL = 2;

    protected static final int KEY_PRESS = 4;

    protected static final int KEY_RELEASE = 8;

    protected static final int KEY_REPEAT = 0x10;

    protected static final int POINTER_PRESS = 0x20;

    protected static final int POINTER_RELEASE = 0x40;

    protected static final int POINTER_DRAG = 0x80;

    /**

     * Constant used by layouter to repaint CustomItem's rectangle section.

     */

    static final int UPDATE_REPAINT_RECT = 4;

    private boolean cleanupNeeded;

    private int contentWidth;

    private int contentHeight;

    private boolean repaintPending;

    private int repaintX1;

    private int repaintY1;

    private int repaintX2;

    private int repaintY2;

    private Object repaintLock;

    private Object cleanupLock;

    private Object resizeLock;

    // Flag for passing info between UI thread

    // and Dispatcher thread

    private boolean widgetDisposed;

    private com.nokia.mj.impl.rt.support.Finalizer finalizer;

    // Graphics command buffer for this instance

    Buffer graphicsBuffer;

    CustomItemLayouter layouter;

    /**

     * Constructor.

     *

     * @param label Label of CustomItem.

     */

    protected CustomItem(String label)

    {

        finalizer = ((finalizer != null) ? finalizer

                     : new com.nokia.mj.impl.rt.support.Finalizer()

        {

            public void finalizeImpl()

            {

                if(finalizer != null)

                {

                    finalizer = null;

                    if(!ESWTUIThreadRunner.isDisposed())

                    {

                        dispose();

                    }

                }

            }

        });

        repaintLock = new Object();

        cleanupLock = new Object();

        resizeLock = new Object();

        setLabel(label);

    }

    /**

     * Get the game action associated with the key code.

     *

     * @param keyCode key code

     * @return game action bound to the key

     */

    public int getGameAction(int keyCode)

    {

        return KeyTable.getGameAction(keyCode);

    }

    /**

     * Get the interaction modes available on this device.

     *

     * @return bitmask of available interaction modes.

     */

    protected final int getInteractionModes()

    {

        // TODO: check final interaction modes

        return TRAVERSE_HORIZONTAL | TRAVERSE_VERTICAL

               | KEY_PRESS | KEY_RELEASE

               | POINTER_PRESS | POINTER_DRAG | POINTER_RELEASE;

    }

    /**

     * Invalidates CustomItem.

     */

    protected final void invalidate()

    {

        updateParent(UPDATE_SIZE_CHANGED);

    }

    /**

     *  Requests repainting of CustomItem.

     */

    protected final void repaint()

    {

        repaint(0, 0, contentWidth, contentHeight);

    }

    /**

     * Requests repainting of the specified area in CustomItem.

     *

     * @param aX

     * @param aY

     * @param aWidth

     * @param aHeight

     */

    protected final void repaint(int aX, int aY, int aWidth, int aHeight)

    {

        Rectangle rect = new Rectangle(aX, aY, aWidth, aHeight);

        // From here it goes to updateItem()

        updateParent(UPDATE_REPAINT_RECT, rect);

    }

    /**

     * Callback method for traverse-in event.

     *

     * @param direction

     * @param viewportWidth

     * @param viewportHeight

     * @param visRect if the CustomItem supports internal traversal and keeps

     *            focus, visRect represents the visible rectangle (focused area)

     * @return true if internal traversal has occurred, false otherwise

     */

    protected boolean traverse(int direction, int viewportWidth,

                               int viewportHeight, int[] visRect)

    {

        return false;

    }

    /**

     * Callback method for traverse-out event.

     */

    protected void traverseOut()

    {

    }

    /**

     * Callback method for key pressed event.

     */

    protected void keyPressed(int aKeyCode)

    {

    }

    /**

     * Callback method for key released event.

     */

    protected void keyReleased(int aKeyCode)

    {

    }

    /**

     * Callback method for key repeated event.

     */

    protected void keyRepeated(int aKeyCode)

    {

    }

    /**

     * Callback method for pointer pressed event.

     */

    protected void pointerPressed(int aX, int aY)

    {

    }

    /**

     * Callback method for pointer released event.

     */

    protected void pointerReleased(int aX, int aY)

    {

    }

    /**

     * Callback method for pointer dragged event.

     */

    protected void pointerDragged(int aX, int aY)

    {

    }

    /**

     * Callback method when item gets shown.

     */

    protected void showNotify()

    {

    }

    /**

     * Callback method when item gets hidden.

     */

    protected void hideNotify()

    {

    }

    /**

     * Callback method for content area size change event.

     */

    protected void sizeChanged(int aWidth, int aHeight)

    {

    }

    /**

     * Abstract method.

     *

     * @param graphics

     * @param aWidth

     * @param aHeight

     */

    protected abstract void paint(Graphics graphics, int aWidth, int aHeight);

    /**

     * Should return the minimum width of the content area.

     */

    protected abstract int getMinContentWidth();

    /**

     * Should return the minimum height of the content area.

     */

    protected abstract int getMinContentHeight();

    /**

     * Should return the preferred width of the content area.

     */

    protected abstract int getPrefContentWidth(int aHeight);

    /**

     * Should return the preferred height of the content area.

     */

    protected abstract int getPrefContentHeight(int aWidth);

    /**

     * Calculates minimum size of this item.

     *

     * @return Minimum size.

     */

    Point calculateMinimumSize()

    {

        return CustomItemLayouter.calculateMinimumBounds(this);

    }

    /**

     * Calculates preferred size of this item.

     *

     * @return Preferred size.

     */

    Point calculatePreferredSize()

    {

        return CustomItemLayouter.calculatePreferredBounds(this);

    }

    /**

     * Set the size of the content area.

     *

     * @param newWidth

     * @param newHeight

     */

    void internalHandleSizeChanged(int newWidth, int newHeight)

    {

        if(contentWidth != newWidth || contentHeight != newHeight)

        {

            synchronized(resizeLock)

            {

                contentWidth = newWidth;

                contentHeight = newHeight;

            }

            EventDispatcher eventDispatcher = EventDispatcher.instance();

            LCDUIEvent event = eventDispatcher.newEvent(LCDUIEvent.CUSTOMITEM_SIZECHANGED, layouter.dfi.getForm());

            event.item = this;

            eventDispatcher.postEvent(event);

            synchronized(cleanupLock)

            {

                cleanupNeeded = true;

            }

            repaint();

        }

    }

    /*

     * Note that if you call this and getContentHeight() from a non-UI thread

     * then it must be made sure size doesn't change between the calls.

     */

    int getContentWidth()

    {

        return contentWidth;

    }

    /*

     * Note that if you call this and getContentHeight() from a non-UI thread

     * then it must be made sure size doesn't change between the calls.

     */

    int getContentHeight()

    {

        return contentHeight;

    }

    boolean isFocusable()

    {

        return true;

    }

    /*

     * This gets called when Form contents are modified.

     */

    void setParent(Screen parent)

    {

        super.setParent(parent);

        if(parent == null)

        {

            // Item was removed from a Form

            layouter = null;

        }

        else

        {

            // Item was added to a Form

            layouter = ((CustomItemLayouter)((Form)parent).getLayoutPolicy().getLayouter(this));

        }

    }

    private boolean invalidate(int x, int y, int width, int height)

    {

        // Regularize bounds

        final int x1 = x;

        final int y1 = y;

        final int x2 = x + width;

        final int y2 = y + height;

        // Union the current and new damaged rects

        final boolean valid = ((repaintX2 - repaintX1) <= 0) && ((repaintY2 - repaintY1) <= 0);

        if(!valid)

        {

            repaintX1 = Math.min(repaintX1, x1);

            repaintY1 = Math.min(repaintY1, y1);

            repaintX2 = Math.max(repaintX2, x2);

            repaintY2 = Math.max(repaintY2, y2);

        }

        else

        {

            repaintX1 = x1;

            repaintY1 = y1;

            repaintX2 = x2;

            repaintY2 = y2;

        }

        // UI thread can change the size at any time. Must make sure it doesn't

        // change between reading the width and the height.

        final int w;

        final int h;

        synchronized(resizeLock)

        {

            w = contentWidth;

            h = contentHeight;

        }

        // Clip to bounds

        repaintX1 = repaintX1 > 0 ? repaintX1 : 0;

        repaintY1 = repaintY1 > 0 ? repaintY1 : 0;

        repaintX2 = repaintX2 < w ? repaintX2 : w;

        repaintY2 = repaintY2 < h ? repaintY2 : h;

        return valid;

    }

    /*

     * Note the control passed as a parameter can change. It must not be stored

     * to the CustomItem. Adding and removing Form item is blocked for the

     * duration of the call.

     */

    void updateItem(Rectangle rect, Control control)

    {

        // Paint callback event is posted without any invalid area info.

        // Invalid area info is kept in the member variables. Only one event

        // per Canvas is added to the queue. If there are more repaint() calls

        // before the already posted event has been served those are merged

        // to the invalid area in the member variables without posting a new

        // event.

        synchronized(repaintLock)

        {

            if(invalidate(rect.x, rect.y, rect.width, rect.height))

            {

                // Note that repaintPending doesn't mean that there's a repaint

                // event in the queue. It means that the invalid area is going

                // to be repainted and there's no need to add a new event.

                // It's possible that the repaint event has already been

                // removed from the queue but repaintPending is still true. In

                // that case it's currently being processed and we can still

                // add to the invalid area.

                if(!repaintPending)

                {

                    EventDispatcher eventDispatcher = EventDispatcher.instance();

                    LCDUIEvent event = eventDispatcher.newEvent(

                                           LCDUIEvent.CUSTOMITEM_PAINT_MIDLET_REQUEST, layouter.dfi.getForm());

                    event.widget = control;

                    event.item = this;

                    eventDispatcher.postEvent(event);

                    repaintPending = true;

                }

            }

        }

    }

    /*

     * Dispatcher thread thread calls. Operations changing Form content through

     * public API are blocked for the duration of the method call, however form

     * internal layout may modify items or even delete some. It has been checked

     * that the eSWT widget has not been disposed and that the CustomItem has not

     * been removed from the Form.

     */

    void doCallback(final LCDUIEvent event)

    {

        switch(event.type)

        {

        case LCDUIEvent.CUSTOMITEM_PAINT_MIDLET_REQUEST:

        case LCDUIEvent.CUSTOMITEM_PAINT_NATIVE_REQUEST:

            doPaintCallback(event);

            break;

        case LCDUIEvent.CUSTOMITEM_HIDENOTIFY:

            hideNotify();

            break;

        case LCDUIEvent.CUSTOMITEM_SHOWNOTIFY:

            showNotify();

            break;

        case LCDUIEvent.CUSTOMITEM_KEYPRESSED:

            keyPressed(event.keyCode);

            break;

        case LCDUIEvent.CUSTOMITEM_KEYREPEATED:

            keyRepeated(event.keyCode);

            break;

        case LCDUIEvent.CUSTOMITEM_KEYRELEASED:

            keyReleased(event.keyCode);

            break;

        case LCDUIEvent.CUSTOMITEM_POINTERDRAGGED:

            pointerDragged(event.x, event.y);

            break;

        case LCDUIEvent.CUSTOMITEM_POINTERPRESSED:

            pointerPressed(event.x, event.y);

            break;

        case LCDUIEvent.CUSTOMITEM_POINTERRELEASED:

            pointerReleased(event.x, event.y);

            break;

        case LCDUIEvent.CUSTOMITEM_SIZECHANGED:

            sizeChanged(event.width, event.height);

            break;

        default:

            super.doCallback(event);

        }

    }

    /*

     * Dispatcher thread calls.

     */

    void doPaintCallback(final LCDUIEvent event)

    {

        // Decide the area going to be painted by the callback.

        final int redrawNowX;

        final int redrawNowY;

        final int redrawNowW;

        final int redrawNowH;

        // Before this thread obtains the repaintLock any repaint() calls

        // will still be adding to the invalid area that is going to be

        // painted by this callback.