/*

* Copyright (c) 2006-2007 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:   Definition of CHuiCanvasVisual.

*

*/

#ifndef __HUICANVASVISUAL_H__

#define __HUICANVASVISUAL_H__

#include <gdi.h>

#include <bitdraw.h>

#include <e32base.h>

#include <uiacceltk/HuiOwnedPointer.h>

#include <uiacceltk/HuiLayout.h>    

#include <uiacceltk/HuiDisplay.h>    

/* Forward declarations. */

class CHuiControl;

class THuiCanvasDrawImageParams;

class THuiCanvasTextParameters;

class CHuiCanvasGc;

class MHuiCanvasPainter;

/** Public initial values for ws painter */	

#define KHuiWsDefaultUserClipRect TRect(0,0,0,0)

#define KHuiWsDefaultLastPrintPosition TPoint(0,0)

#define KHuiWsDefaultPenColor KRgbBlack  

#define KHuiWsDefaultPenStyle CGraphicsContext::ESolidPen  

#define KHuiWsDefaultPenSize TSize(1,1)  

#define KHuiWsDefaultDrawMode CGraphicsContext::EDrawModePEN  

#define KHuiWsDefaultLinePosition TPoint(0,0)  

#define KHuiWsDefaultOrigin TPoint(0,0)  

#define KHuiWsDefaultBrushUsed EFalse  

#define KHuiWsDefaultBrushColor KRgbWhite  

#define KHuiWsDefaultBrushOrigin TPoint(0,0)  

#define KHuiWsDefaultBrushStyle CGraphicsContext::ENullBrush  

#define KHuiWsDefaultCharJustExcess 0  

#define KHuiWsDefaultCharJustNum 0  

#define KHuiWsDefaultWordJustExcess 0  

#define KHuiWsDefaultWordJustNum 0  

#define KHuiWsDefaultDitherOrigin TPoint(0,0)  

#define KHuiWsDefaultDotLength 0  

#define KHuiWsDefaultDotMask 0  

#define KHuiWsDefaultDotParam 0  

#define KHuiWsDefaultDotDirection 1  

#define KHuiWsDefaultShadowMode CFbsDrawDevice::ENoShadow  

#define KHuiWsDefaultStrikethrough EStrikethroughOff  

#define KHuiWsDefaultUnderline EUnderlineOff  

#define KHuiWsDefaultUserDisplayMode ENone  

#define KHuiWsDefaultShadowColor KRgbGray

#define KHuiWsDefaultFadeColor 0x80FFFFFF

enum THuiCanvasPaintType

    {

    /** Transparent or semitransparent */

    EHuiCanvasPaintTypeTransparent,

    /** Fully opaque */

    EHuiCanvasPaintTypeOpaque            

    };

NONSHARABLE_STRUCT (THuiCanvasPaintedArea)

    {

    /** Painted area in the canvas */

    THuiRealRect iPaintedRect;    

    /** Paint type of the area */

    TInt iPaintType;

    /** Reserved for future */

    TInt iFlags;

    };

enum THuiCanvasFlags

    {

    /** Disables canvas from drawing the canvas content */

    EHuiCanvasFlagDisableCanvasContent    = 0x1,

    /** Disables canvas from drawing the canvas background (if set) */

    EHuiCanvasFlagDisableCanvasBackground = 0x2,

    /** Canvas is drawn with external fade effect */

    EHuiCanvasFlagExternalFade = 0x4,

    /** Canvas drawing is clipped to own and parent canvas intersection */

    EHuiCanvasFlagEnableCanvasClipping = 0x8,           

    /** External fade effect (if enabled) is extended to children */

    EHuiCanvasFlagExternalFadeToChildren = 0x10,    

    /** External fade effect (if enabled) is set to a parent (or grandparent) */

    EHuiCanvasFlagExternalFadeByParent = 0x40,    

    /** Effect is excluded from parent (or grandparent) effect (if it has effect which is applied to children) */

    EHuiCanvasFlagExcludeFromParentEffect = 0x80,

    /** Hint flag which is used for optimizations. Tells if fade effect(s) exist in visual tree */

    EHuiCanvasFlagExternalFadeExistsInsideVisualTree = 0x100 

    };

/**

 * This class is used internally by the toolkit and thus should

 * not be used by the applications directly.

 */

class CHuiCanvasVisual : public CHuiLayout

    {

public:

    enum

        {

        /** @deprecated */

        ECommandBufferHui,

        /** @deprecated */

        ECommandBufferSgc    

        };

	enum

	    {

	    ECommandBufferAlf,

	    ECommandBufferWs    

	    };

    /* Constructors and destructor. */

    /**

     * Constructs and appends a new Canvas visual to the owner control.

     *

     * @param aOwnerControl  Control that will own the new visual.    

     * 

     * @param aCanvasType The enumerator describing the type of concrete Canvas

     * to be created.     

     *

     * @return  The new visual.

     */

    IMPORT_C static CHuiCanvasVisual* AddNewL(CHuiControl& aOwnerControl,

                                            CHuiLayout* aParentLayout = 0);

    /**

     * Constructor.

     */

    CHuiCanvasVisual(MHuiVisualOwner& aOwner);

    /**

     * Second-phase constructor.

     */

    void ConstructL();

    /**

     * Destructor.

     */

    ~CHuiCanvasVisual();

    /**

     * Sets buffer that contains canvas drawing commands. This

     * method clears previous buffer(s).

     *

     * @param aCommands Commanbuffer

     */

    IMPORT_C void SetCommandSetL( const TDesC8& aCommands );

    /**

     * Sets the type of commands in the buffer.

     *

     * @param aCommandType Type of the command buffer, either

     * ECommandBufferHui or ECommandBufferSgc. In the future

     * more command set types may be supported.

     *

     */

    IMPORT_C void SetCommandType( TInt aCommandType );

    /**

     * Clears buffer(s) that contains canvas drawing commands. 

     */

    IMPORT_C void ClearCommandSet();

    IMPORT_C void SetTrackCommandSet( TFileName& aFileName, TBool aTrack );

    /**

     * Adds buffer that contains more canvas drawing commands,

     * those will be executed after the buffers that has been

     * added previously.

     * @param aMoreCommands Commanbuffer

     */

    IMPORT_C void AddCommandSetL( const TDesC8& aMoreCommands );

    /**

     * Adds partial buffer that contains more canvas drawing commands. These

     * commands are appended to the commands set previously with this method

     * until param aLastPart has value ETrue. After that whole command set

     * will be added among possibly already existing command sets and

     * it will be drawable.

     * 

     * @param aMoreCommands Commanbuffer

     * @param aLastPart EFalse if there are more commands to be added into this

     * command set before it is wanted to be available for drawing. ETrue if

     * command set is ready and no more parts are expected.

     */

    IMPORT_C void AddPartialCommandSetL( const TDesC8& aMoreCommands, TBool aLastPart );

    /**

     * Clears internal cached texts and images.

     */

    IMPORT_C void ClearCache();

    /**

     * Prepares internal cached texts and images.

     */

    IMPORT_C void PrepareCache();

    /**

     * Sets the flag that tells the canvas to clear the background before

     * doing a refresh. 

     *

     * Note1: EClearWithSkinBackground is not (yet) supported.

     * Note2: EClearWithColor does not do alphablending, it just clears the area 

     * and writes alpha values to the rendering surface. 

     *

     * @param aClearBackground  Background clearing mode. 

     * @see SetBackgroundColor()

     */

    IMPORT_C void SetClearBackground(CHuiDisplay::TClearMode aClearBackground);

    /**

     * Sets the background color, if background clearing has

     * been enabled.

     *

     * @param aBackgroundColor  The color to set the background to.

     * @see SetClearBackgroundL()

     */

    IMPORT_C void SetBackgroundColor(const TRgb& aBackgroundColor);

    /**

     * Sets the items that specify how to clear display before display refresh.

     * Items may have overlapping rectangles, drawing order is same as item order

     * in the parameter array. But having lots of overlapping drawing 

     * causes negative performance impact.

     * 

     * This method is alternative to SetClearBackgroundL and SetBackgroundColor

     * methods.

     * 

     * @see SetBackgroundColor()

     * @see SetClearBackgroundL()

     * @param aItems Array of items that specify how to clear the background.

     */

    IMPORT_C void SetBackgroundItems(const RArray<THuiDisplayBackgroundItem>& aItems);

    /**

     * Returns the number of rectangular areas which contain something that is

     * drawn by the visual.

     *

     * @return number of painted areas.

     * @see PaintedArea()

     */

    IMPORT_C TInt PaintedAreaCount() const;

    /**

     * Returns information of the painted area at given index. 

     *

     * @param aIndex Index of the painted area.

     * @return Painted area info.

     * @see PaintedAreaCount()()

     */

    IMPORT_C THuiCanvasPaintedArea PaintedArea(TInt aIndex);

    /**

     * Draws content of the window in pixel format to the given bitmap. 

     * This method may not be supported in all commanbuffertype/renderer combinations.

     *

     * @param aTargetBuffer where content of the window is to be drawn. NULL if the drawing

     * is to be stopped.

     *

     * @return KErrNotSupported if the current renderer/painter does not support the

     * feature. Leave happens in other unexpected error situtations. 

     *         

     */

    IMPORT_C TInt SetCapturingBufferL(CFbsBitmap* aTargetBuffer);

    /**

     * Sets canvas flags

     * @param aCanvasFlags flags to be set

     *

     */

    IMPORT_C void SetCanvasFlags(TInt aCanvasFlags);

    /**

     * Clears canvas flags

     * @param aCanvasFlags flags to be cleared.

     *

     */

    IMPORT_C void ClearCanvasFlags(TInt aCanvasFlags);

    /**

     * Gets canvas flags

     * @return flags

     *

     */

    IMPORT_C TInt CanvasFlags();

    /**

     * Set external content visual to be drawn to the canvas visual.

     * Giving a NULL pointer as a parameter removes the external content.

     * @param aVisual the visual that is used as external content

     *

     */

	IMPORT_C void SetExternalContentL(CHuiVisual* aVisual);

    /**

     * Return external content visual of the canvas visual.

     * NULL return value means there is no external content.

     * @return NULL or the visual that is used as external content

     */

    IMPORT_C CHuiVisual* ExternalContent();

    /**

     * Set parent canvas visual. Parent is used for determining clipping 

     * region incase canvasflag EHuiCanvasFlagEnableCanvasClipping is set.

     *

     * @param aParent Canvas visual which is used to determine effective 

     * clipregion.

     */

    IMPORT_C void SetParentCanvas(CHuiCanvasVisual* aParent);

    /**

     * Gets reference to canvas gc

     */

    CHuiCanvasGc& CanvasGc() const;

    IMPORT_C TBool IsBackgroundDrawingEnabled() const;

    const TRegion& ClipRegion() const;

    void AddChildCanvas(CHuiCanvasVisual* aChild);

    void RemoveChildCanvas(CHuiCanvasVisual* aChild);

    IMPORT_C TBool HasCommandBuffers(TBool aAskFromChildren = ETrue) const;

    // to handle background surface that may be set to the Window

public:    

    IMPORT_C TBool LayerUsesAlphaFlag();

    IMPORT_C void SetLayerUsesAlphaFlag(TBool aEnabled);

    IMPORT_C TRect& LayerExtent(); 

    IMPORT_C void SetLayerExtent(TRect& aExtent); 

public:

    void SetSize(const THuiRealSize& aSize, TInt aTransitionTime=0);    

    TBool ChildSize(TInt aOrdinal, TSize& aSize);    

    TBool ChildPos(TInt aOrdinal, TPoint& aPos);

    TInt ChildRect(TInt aOrdinal, THuiRealRect& aRect);        

private:

    void HandleBuffer(TRect& aDisplayRect, TInt aAction, CHuiGc* aGc) const;        

    void SetCommandTypeL(TInt aCommandType);         

    TBool IsContentDrawingLayered() const;

    TBool IsContentDrawingEnabled() const;

    TBool IsExternalContentDrawingEnabled(TBool aIncludeChildren = EFalse) const;

    TBool IsCanvasClippingEnabled() const;

    TBool EffectActive() const;

public: // From CHuiVisual

	TBool PrepareDrawL();

	void Draw(CHuiGc& aGc) const;

 	/**

     * Draw the visual.

     */

    void DrawSelf(CHuiGc& aGc, const TRect& aDisplayRect) const;

    TBool Changed() const;

    IMPORT_C void SetChanged();

    IMPORT_C void ClearChanged();

    void ExpandRectWithContent(TRect& aRect) const;

    THuiRealPoint ConvertPoint(const THuiRealPoint& aPointInUnits) const;

    void ExpandRect(TRect& aRectToExpand, const TRect& aNewRect) const;

public:    

    IMPORT_C void StoreRenderBufferL();

    void DrawStoredVisualRenderBuffer() const;

    void DrawStoredFullScreenRenderBuffer(CHuiGc& aGc) const;

    IMPORT_C void FreeRenderBuffer();

private:

    THuiCanvasPaintedArea CanvasPaintedArea(TInt aIndex) const;

    void DrawChildren(CHuiGc& aGc) const;

    void DrawCanvasChildren(CHuiGc& aGc, TInt aIncludeCanvasFlags, TInt aExcludeCanvasFlags) const;

    TBool ChildTreeChanged(TInt aExcludeCanvasFlags) const;

private: 

    struct THuiCanvasVisualData;

    THuiCanvasVisualData* iCanvasVisualData;

    };

#endif  // __HUICANVASVISUAL_H__