/*

* Copyright (c) 2002-2004 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: Edit mode for widget drag and drop.

*

*/

#ifndef XNEDITMODE_H

#define XNEDITMODE_H

// System includes

#include <coecntrl.h>

// Forward declarations

class CXnUiEngine;

class CXnViewManager;

class CXnNode;

class CFbsBitGc;

class CFbsBitmap;

class CFbsBitmapDevice;

class CWindowToBitmapMappingGc;

// Class declaration

/**

 * Edit mode. Enables widget drag and drop.

 *

 * @ingroup group_xnlayoutengine

 * @lib xnlayoutengine.lib

 * @since Series 60 5.1

 */

NONSHARABLE_CLASS( CXnEditMode ) : public CCoeControl  

    {

public:

    // Data types

    enum TEditState

        {

        ENone = 0x00,

        EWaitDrag = 0x01,        

        EShootContent = 0x02,

        EDragging = 0x04,

        EDragAndDrop = 0x08,

        EKeyMove = 0x10

        };

public:

    /**

     * Two-phased constructor.

     */

    static CXnEditMode* NewL( CXnUiEngine& aUiEngine );

    /**

     * Destructor.

     */

    ~CXnEditMode();

private:

    // from CCoeControl

    /**

     * @see CCoeControl

     */

    void Draw( const TRect& aRect ) const;

    /**

     * @see CCoeControl

     */    

    void MakeVisible( TBool aVisible );

    /**

     * @see CCoeControl

     */        

    void HandlePointerEventL( const TPointerEvent& aPointerEvent );

    /**

     * @see CCoeControl

     */        

    TKeyResponse OfferKeyEventL( const TKeyEvent& aKeyEvent, 

            TEventCode aType );

    /**

     * @see CCoeControl

     */            

    void SizeChanged();

public:

    // New functions

    /**

     * Changes the state of edit mode.

     *

     * @since Series 60 5.0

     * @param aSet The state of edit mode.     

     */

    void SetEditModeL( CXnEditMode::TEditState aSet );

    /**

     * Gets the status of the edit mode.

     *

     * @since Series 60 5.0

     * @return Edit mode state.

     */

    CXnEditMode::TEditState EditState() const;

    /**

     * This is for to re-initializing the double buffer when the orientations

     * is changed

     *

     * @since Series 60 5.0

     */

    void HandleScreenDeviceChangedL();

    /**

     * Reset the dragging state and update screen

     *

     * @since Series 60 5.0

     */

    void StopDraggingL();

private:

    // new functions

    /**

     * Organizing starts using drag and drop.

     *

     * @since Series 60 5.0

     * @param aNode Node to drag.

     */

    void StartDragL( CXnNode& aNode );

    /**

     * Reset the dragging state and deletes screenshot bitmaps.

     *

     * @since Series 60 5.0

     */

    void StopDragL();

    /**

     * Updates invalid parts of the screen. Calls internally DrawNow

     *

     * @since Series 60 5.0     

     */

    void UpdateScreen();

    /**

     * Sets the title for status pane

     *

     * @since Series 60 5.0

     */

private:    

    // Constructors

    /**

     * C++ default constructor.

     */

    CXnEditMode( CXnUiEngine& aEngine );

    /**

     * 2nd phase constructor.

     */    

    void ConstructL();

private:

    // Data

    /**

     * UI engine

     * Not own.

     */

    CXnUiEngine& iUiEngine;

    /**

     * View manager

     * Not own.

     */

    CXnViewManager& iViewManager;

    /**

     * Screenshot of part of mainpane

     * Owned

     */    

    CFbsBitmap* iMainpane;

    /**

     * Screenshot of widget

     * Owned

     */

    CFbsBitmap* iWidget;

    /**

     * Mapping Gc

     * Owned

     */

    CWindowToBitmapMappingGc* iMapGc;

    /**

     * Bmp device

     * Owned

     */

    CFbsBitmapDevice* iBmpDevice;

    /**

     * Bmp Gc

     * Owned

     */

    CFbsBitGc* iBmpGc;          

    /**

     * A pointer to the node that is being dragged.

     * Not own.

     */

    CXnNode* iDraggingNode;

    /**

     * A pointer to the node that is underneath of the dragging node.

     * Not own.

     */

    CXnNode* iTargetNode;

    /**

     * State of edit mode

     */

    CXnEditMode::TEditState iState;

    /**

     * A point where dragging started from.

     */

    TPoint iStylusDownPos;

    /**

     * A point where drawing was done last time.

     */

    TPoint iPreviousPos;

    /**

     * Screenshot draw position

     */

    TPoint iDrawPos;

    /**

     * Last redraw rect

     */

    TRect iLastDrawRect;

    /**

     * Flag determine whether drag is occured

     */

    TBool iDragged;

    };

#endif