/*

* Copyright (c) 2008 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:  Layout calculation and UI rendering mechanism implementations.

*

*/

#ifndef _CXNUIENGINEIMPL_H

#define _CXNUIENGINEIMPL_H

// System includes

// User includes

#include "xnuistatelistener.h"

#include "xnviewmanager.h"

#include "xnmenu.h"

// Forward declarations

class CCoeControl;

class CXnControlAdapter;

class CXnNode;

class CXnPointerArray;

class CXnODT;

class CGraphicsDevice;

class CXnUiEngine;

class CXnKeyEventDispatcher;

class CXnEditor;

class CXnResource;

class CXnEditMode;

class CXnViewManager;

class CXnViewData;

class CXnPluginData;

// Constants

namespace XnLayoutPhase

    {

    const TInt ENone = 0x00;

    const TInt ELayout = 0x01;

    const TInt EMeasure = 0x02;

    }

namespace XnLayoutControl

    {

    const TInt ELayoutUI = 0x01;

    const TInt ERenderUI = 0x02;

    const TInt ERefreshMenu = 0x04;

    const TInt EIgnoreState = 0x08;

    const TInt EViewDirty = 0x10;

    const TInt EEffectStarted = 0x20;    

    }

NONSHARABLE_STRUCT( TXnSplitScreenState )

    {

    /** Partial screen editor node. Not own */

    CXnNode* iPartialScreenEditorNode;

    /** Is partial screen input open */

    TBool iPartialScreenOpen;

    /** Partial screen block progression. Own. */

    const TDesC8* iPartialScreenBlock;

    // ctor

    TXnSplitScreenState() : 

        iPartialScreenEditorNode( NULL ),

        iPartialScreenOpen( EFalse ),

        iPartialScreenBlock( NULL ) {}

    };

// Class declaration

/**

 *  Layout calculation and UI rendering mechanism

 *  implementations.

 *  

 *  @ingroup group_xnlayoutengine

 *  @lib xn3layoutengine.lib

 *  @since Series 60 3.1

 */

NONSHARABLE_CLASS( CXnUiEngineImpl ) : public CBase,     

    public MXnViewObserver, 

    public MXnUiResourceChangeObserver,

    public XnMenuInterface::MXnMenuObserver

    {

public:

    // Constructors and destructor

    /**

     * Two-phased constructor.

     * 

     * @param aUiEngine Ui engine

     * @param aViewManager View manager

     */

    static CXnUiEngineImpl* NewL( CXnUiEngine& aUiEngine,

        CXnAppUiAdapter& aAdapter );

    /**

     * 2nd phase constructor 

     */

    void ConstructL();

    /**

     * Destructor.

     */

    virtual ~CXnUiEngineImpl();

public:

    // New functions

    /**

     * Gets AppUi

     *

     * @since S60 5.0     

     * @return AppUi

     */    

    CXnAppUiAdapter& AppUiAdapter() const;

    /**

     * Lays out the UI

     * 

     * @since Series 60 3.1

     * @param aNode Starting point of the layout

     */

    void LayoutUIL( CXnNode* aNode = NULL );

    /**

     * Creates UI implementations for the UI, adjusts control coordinates 

     * according to the layout

     * 

     * @since Series 60 3.1

     * @param aNode Starting point

     */

    void RenderUIL( CXnNode* aNode = NULL );

    /**

     * Gets the root node of the UI

     * 

     * @since Series 60 3.1

     * @return Root node

     */

    CXnNode* RootNode();

    /**

     * Gets the ODT

     * 

     * @since Series 60 3.1

     * @return ODT

     */

    CXnODT* ODT();

    /**

     * Finds a node by id

     * 

     * @since Series 60 3.1

     * @param aNode Node id

     * @param aNamespace Namespace

     * @return Node with given id

     */

    CXnNode* FindNodeByIdL( const TDesC& aNodeId,

        const TDesC& aNamespace = KNullDesC );

    /**

     * Finds a node by id, b-bit version

     * 

     * @since Series 60 3.1

     * @param aNode Node id

     * @param aNamespace Namespace

     * @return Node with given id

     */

    CXnNode* FindNodeByIdL( const TDesC8& aNodeId, 

        const TDesC8& aNamespace = KNullDesC8 );

    /**

     * Finds nodes by class

     * 

     * @since Series 60 3.1

     * @param aClassId Class id

     * @return Nodes with given class id

     */

    CXnPointerArray* FindNodeByClassL( const TDesC& aClassId,

        const TDesC& aNamespace = KNullDesC );

    /**

     * Finds nodes by class

     * 

     * @since Series 60 3.1

     * @param aClassId Class id

     * @return Nodes with given class id

     */

    CXnPointerArray* FindNodeByClassL( const TDesC8& aClassId,

        const TDesC8& aNamespace = KNullDesC8 );

    /**

     * Find content source nodes from namespace. Ownership is not transferred.

     *

     * @since S60 5.2

     * @param aNamespace Namespace

     * @return Content source nodes from namespace

     */    

    CXnPointerArray* CXnUiEngineImpl::FindContentSourceNodesL(

        const TDesC8& aNamespace );

    /**

     * Gets resources of the UI

     * 

     * @since Series 60 3.1

     * @return List of resources

     */

    CArrayPtrSeg< CXnResource >& Resources();

    /**

     * Sets currently focused node

     * 

     * @since Series 60 3.1

     * @param aFocusedNode Currently focused node

     * @param aSource A source of event that triggered focus change.

     */

    void SetFocusedNodeL( CXnNode* aFocusedNode, TInt aSource = 0 );

    /**

     * Get currently focused node

     * 

     * @since Series 60 3.1

     * @return Focused node.

     */

    CXnNode* FocusedNode();

    /**

     * Checks if the UI is in Edit mode.

     * 

     * @since Series 60 5.0        

     * @return ETrue if the current mode is edit, otherwise EFalse.

     */

    TBool IsEditMode();

    /**

     * Get a numeric value of a property in vertical pixels

     * 

     * @since Series 60 3.1

     * @param aValue Property

     * @param aReferenceValue Value used for percentage calculation

     * @return Value in vertical pixels

     */

    TInt VerticalPixelValueL( CXnProperty* aValue, TInt aReferenceValue );

    /**

     * Get a numeric value of a property in horizontal pixels

     * 

     * @since Series 60 3.1

     * @param aValue Property

     * @param aReferenceValue Value used for percentage calculation

     * @return Value in horizontal pixels

     */

    TInt HorizontalPixelValueL( CXnProperty* aValue, TInt aReferenceValue );

    /**

     * Get a numeric value of a property in vertical twips

     * 

     * @since Series 60 3.1

     * @param aValue Property

     * @param aReferenceValue Value used for percentage calculation

     * @return Value in vertical twips

     */

    TInt VerticalTwipValueL( CXnProperty* aValue, TInt aReferenceValue );

    /**

     * Get a numeric value of a property in horizontal twips

     * 

     * @since Series 60 3.1

     * @param aValue Property

     * @param aReferenceValue Value used for percentage calculation

     * @return Value in horizontal pixels

     */

    TInt HorizontalTwipValueL( CXnProperty* aValue, TInt aReferenceValue );

    /**

     * Refresh current menu

     *

     * @since Series 60 3.1

     */

    void RefreshMenuL();

    /**

     * Returns view manager

     *

     * @since S60 5.0

     * @return view manager

     */

    CXnViewManager* ViewManager();

    /**

     * Returns the active view

     * @since Series 60 3.1

     * @return Active view node

     */

    CXnNode* ActiveView();

    /**

     * Add a dirty node. LayoutUiL and RenderUiL will only perform operations

     * on the set of dirty nodes.

     *

     * @since Series 60 3.1

     * @param aNode Dirty node.

     * @param aLayoutPhaseHint, a hint where to start next layout phase

     */

    void AddDirtyNodeL( CXnNode* aNode, TInt aLevel );

    /**

     * Get the size of the current screen device

     *

     * @since Series 60 3.1

     * @return Size of the current screen device

     */

    TSize ScreenDeviceSize() const;

    /**

     * Checks whether the dialog is displaying.

     *

     * @since Series 60 3.1

     * @return ETrue if dialog is displaying.

     */

    TBool IsDialogDisplaying();

    /**

     * Handles a change to the control's resources of type aType

     *

     * @since Series 60 3.1

     * @param aType Changed resource type

     */

    void HandleResourceChangeL( TInt aType );

    /**

     * Checks whether the menu is displaying.

     * 

     * @since Series 60 3.1

     * @return ETrue if menu is displaying.

     */

    TBool IsMenuDisplaying();

    /**

     * Returns menubar node

     * 

     * @since Series 60 3.2

     * @return Menubar node

     */

    CXnNode* MenuBarNode() const;

    /**

     * Returns stylus popup node

     * 

     * @since S60 60 5.0

     * @return stylus popup node

     */    

    CXnNode* StylusPopupNode() const;

    /**

     * Set node as passive, and add it to the passive focused node array.

     * 

     * @since Series 60 3.2

     * @param aNode Node to use.

     */

    void AddPassiveFocusedNodeL( CXnNode* aNode );

    /**

     * Unset the passive focus from the node, and remove it from the passive 

     * focused node array.

     * 

     * @since Series 60 3.2

     * @param aNode Node to use.

     */

    void RemovePassiveFocusedNodeL( CXnNode* aNode );

    /**

     * Clear the passive focused node array, and unset the passive focus 

     * states.

     * 

     * @since Series 60 3.2

     */

    void ClearPassiveFocusedNodesL();

    /**

     * Sets node's dropped state

     * 

     * @since Series 60 3.2

     * @param aNode Node

     * @param aDropped Dropped

     */

    void SetNodeDroppedL( CXnNode& aNode, TInt aDropped ) const;

    /**

     * Checks if node is adaptive, but doesn't have any content

     * 

     * @since Series 60 3.2

     * @param aNode node

     * @param aAvailableSize size to be checked

     */

    void CheckAdaptiveContentL( CXnNode& aNode, TSize aAvailableSize ) const;

    /**

     * Adds a node which can be focused

     * 

     * @since Series 60 3.2

     * @param aNode Node

     */

    void AddFocusCandidateL( CXnNode* aNode );

    /**

     * Sets client rect

     * 

     * @since Series 60 3.2

     * @param aRect area to be set

     * @param aDrawNow Call rendering routines if ETrue

     */

    void SetClientRectL( TRect aRect, TBool aDrawNow = ETrue );

    /**

     * Fetch editor to operate on AI3 widgets.

     * 

     * @since Series 60 5.0

     * @return Pointer to Editor

     */

    CXnEditor* Editor() const;

    /**

     * Gets client rect

     * 

     * @since Series 60 3.2

     * @return client rect

     */

    TRect ClientRect() const;

    /**

     * Gets pointer to edit mode storage.

     * 

     * @since Series 60 5.0

     * @return edit mode storage

     */

    CXnEditMode* EditMode();

    /**

     * Get current view plugins nodes.

     * 

     * @since Series 60 5.0

     * @return Pointer to plugin node array

     */

    RPointerArray< CXnNode >* Plugins();

    /**

     * Gets theme resource file

     * 

     * @since S60 5.1         

     * @param aPath path from which file is found

     * @param aFile file to which resource is set

     * @return errorcode

     */

    TInt GetThemeResource( const TDesC& aPath, RFile& aFile );

    /**

     * Analyse added widget

     * 

     * @since S60 5.1

     * @param aNode Widget to be analyzed

     * @return ETrue if fits, EFalse otherwise

     */

    TBool AnalyseAddedWidgetL( CXnNode& aNode );

    /**

     * Disables layoyt and redraw, places cleanup item to cleanup stack

     * for enabling layot and redraw

     * 

     * @since Series 60 5.0     

     */                        

    void DisableRenderUiLC();

    /**

     * Set event dispatcher

     * 

     * @since Series 60 5.0

     * @param aDispather Event dispatcher     

     */                    

    void SetEventDispatcher( CXnKeyEventDispatcher* aDispatcher );

    /**

     * Enables partial touch input

     * 

     * @since Series 60 5.2

     * @param TBool Partial input is enabled      

     */      

    /**

     * Is partial input active

     * 

     * @since Series 60 5.2

     * @return TBool is partial input active      

     */      

    TBool IsPartialInputActive();

    /**

      * Checks if text editor is focused or partioal touch input open.

      * 

      * @since Series 60 5.2

      * @return TBool True if partial input is open or editor focused

      */