/*

* Copyright (c) 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:  Plugin utility used for automatic tags ( http, email, phone numbers )

*                syntax highlighting in text viewers

*

*

*/

#ifndef ITEMFINDER_H

#define ITEMFINDER_H

// INCLUDES

#include <mparser.h>                       // for MParser

// CONSTANTS

// FORWARD DECLARATIONS

class CEikRichTextEditor;

class CFindItemEngine;

class CItemFinderAsyncParser;

class CSchemeResolver;

class CFindItemEngine;

// CLASS DECLARATION

class MItemFinderObserver

    {

    public:

        virtual void HandleParsingComplete() = 0;

    };

/**

* Parser plugin

*/

NONSHARABLE_CLASS(CItemFinder) :

    public CBase,

    {

    public:  // Constructors and destructor

        /**

        * Destructor.

        */

        ~CItemFinder();

    public: // definitions

        enum TItemType

            {

            ENoneSelected = 0,

            EUrlAddress = 1,

            EEmailAddress = 2,

            EPhoneNumber = 4,

            EUriScheme =8

            };

        enum TFindDirection

            {

            EInit = 0,

            ENextDown = 1,

            ENextUp = 2,

            EInitDown = 3,

            EInitUp = 4

            };

        /*class CFindItemDef: public CBase // @deprecated since 3.2

            {

            public:

                ~CFindItemDef(){ if ( iItemDescriptor ) delete iItemDescriptor; }

                TItemType iItemType;

                HBufC* iItemDescriptor;

                TInt iDisplayLength;

            };*/

        class CFindItemExt: public CBase // replaces CFindItemDef.

            {

            public:

                IMPORT_C ~CFindItemExt();// { if ( iItemDescriptor ) delete iItemDescriptor; }

                TItemType iItemType;

                HBufC* iItemDescriptor;

                TInt iStart;

                TInt iEnd;

            };

    public: // New functions

        /**

        * @since Series 60 2.6

        * Creates instance of ItemFinder and adds it to editor parser list (TLS)

        * Must be called before editor creation in order to have effect

        *

        * @param    aFindFlags   Find mode ( defaults to all )

        * @return                New instance

        */

        IMPORT_C static CItemFinder* NewL( TInt aFindFlags = EUrlAddress|EEmailAddress|EPhoneNumber );

        /**

        * @since Series 60 2.6

        * Notify item finder to move focus to next item or scroll display

        *

        * @param    aDirection   Direction ( ENextDown or ENextUp )

        * @return                EFalse if command had no effect, ETrue otherwise

        */

        IMPORT_C TBool NextItemOrScrollL( TFindDirection aDirection );

        /**

        * @since Series 60 2.6

        * Sets the find mode, can be used for initialize parsers for current position after eg screen size change

        * Refreshes parser data if editor and text set.

        *

        * @param    aFindFlags      Any combination of (EUrlAddress|EEmailAddress|EPhoneNumber)

        */

        IMPORT_C void SetFindModeL( TInt aFindFlags );

        /**

        * @since Series 60 2.6

        * Set pointer to applications instance of CEikRichTextEditor.

        * If editor is not set, all methods return immediately

        * Editor should have texts installed when application sets the pointer

        * Refreshes parser data if text is set.

        *

        * @param    aEditor Pointer array pointing applications editor instance

        */

        IMPORT_C void SetEditor( CEikRichTextEditor** aEditor );

    public: // From MParser

        IMPORT_C TBool ParseThisText(

            const CRichText& aTextObj,

            TBool aAllowBack,

            TInt aStartScan,

            TInt aScanLength,

            TInt& aStartTag,

            TInt& aTagLength );

        IMPORT_C const TDesC& CreateDoItText(

            const CRichText& aTextObj,

            TInt aStartText,

            TInt aLength );

        IMPORT_C void ActivateThisTextL(

            const CRichText& aTextObj,

            TInt aStartText,

            TInt aLength );

        IMPORT_C TBool ReformatOnRecognise() const;

        IMPORT_C TBool ReformatOnRollover() const;

        IMPORT_C void GetRecogniseFormat( TCharFormat& aFormat );

        IMPORT_C void GetRolloverFormat( TCharFormat& aFormat );

        IMPORT_C TBool ConfirmCursorOverTag(

            const CRichText& aTextObj,

            TInt aTagStart,

            TInt aTagLen,

            TInt aCurPos );

        IMPORT_C void Release();

        IMPORT_C void MParser_Reserved_2();

    public: // new methods

        /**

        * @since Series 60 2.6

        * Returns document position of next item in given direction.

        * Needed if application wants to control the scrolling and

        * NextItemOrScrollL() is thus not suitable.

        *

        * @param    aDirection   Direction ( ENextDown or ENextUp )

        * @return                Start position of next tag, KErrNotFound if

        *                        no tag found from given direction

        */

        IMPORT_C TInt PositionOfNextItem( TFindDirection aDirection );

        /**

        * @since Series 60 2.6

        * Deletes current item descriptor and sets type to ENoneSelected

        */

        IMPORT_C void ResetCurrentItem();

        /**

        * @since Series 60 2.6

        *

        * Creates item descriptor starting from aStart and sets the item type

        * to CurrentItem().iItemType, if default value is not overridden

        * uses internal members to resolve type.

        * Method does NOT any formatting to editor.

        *

        * @param    aStart   Position from which tag to be recognized should start

        *                    Default value uses internal members

        */

        IMPORT_C void ResolveAndSetItemTypeL( TInt aStart = KErrNotFound );

        /**

        * @since Series 60 2.6

        *

        * Sets external observer (Must implement MItemFinderObserver) to which notify when parsing is completed.

        * There is no need to set an observer if ItemFinder implements scrolling in editor.

        * Must be called before SetEditor in order to have effect.

        *

        * @param    aObserver   Observer which will be notified about the praser state changes

        */

        IMPORT_C void AddObserver( MItemFinderObserver& aObserver );

        /**

        * @since Series 60 3.2

        *

        * Tells whether the point tapped inside the editor text body was hit some find item.

        * Also updates the current item selection and cursor position when necessary.

        *

        */

        IMPORT_C TBool ItemWasTappedL( const TPoint aTappedPoint );

        /**

        * @since Series 60 3.2

        * Sets the given external links (hyperlinks) and refreshes the text buffer.

        * Validites the links by their type.

        *

        * @param    aLinks a pointer list of external link objects ordered by start position (lowest first).

        * @return   KErrNone if successfull operation, otherwise system-wide error code.

        */

        IMPORT_C TInt SetExternalLinks( CArrayPtrFlat<CFindItemExt>* aLinks );

        /**

        * @since Series 60 3.2

        * Returns reference to currently selected item, if none selected iItemType = ENoneSelected

        * Please note that method does not check whether the editor has focus or not, it will return

        * last selected item even the highlight is not visible as editor is not focused

        * Unlike CurrentItem() that contains the length, this method also contains position of the item.

        *

        * @return   currently selected item

        */

        IMPORT_C CFindItemExt& CurrentItemExt();

        /**

        * @since Series 60 3.2

        * Returns the current selection of the text buffer on the screen.

        *

        * @return   current selection of the text buffer on the screen.

        */

        IMPORT_C TPtrC CurrentSelection();

    private:

        /**

        * C++ default constructor.

        */

        CItemFinder( TInt aFindFlags );

        // utilities

        TInt EngineFlags();

        void InsertPrefixToUrl();

        TBool SchemeSupported( const TDesC& aScheme );

        TBool CallbackToExtObserver();

        /**

        * 2nd phase constructor.

        */

        void ConstructL();

        void DoResolveAndSetItemTypeL( const CFindItemExt* aItem );

        TInt MinLengthForItemType( TInt aItemType );

        TInt GetMinDigitsToFindL();

        TInt RefreshEditor();

    private:    // Data

        CEikRichTextEditor** iEditor; // Not owned

        TInt iFlags;

        CFindItemExt* iCurrentItemExt;

        CArrayPtrFlat<CFindItemExt>* iExternalLinks;

        TInt iCurrentStart;

        TInt iCurrentEnd;

        TFindDirection iPreviousDirection;

        TInt iFirstVisible;

        CItemFinderAsyncParser* iAsyncParser;

        CSchemeResolver* iSchemeResolver;

        TBool iMarkedArrayComplete;

        MItemFinderObserver* iExternalObserver; // not owned

        friend class CItemFinderAsyncParser;

        TInt iMinDigitsToFind;

    };

#endif      // ITEMFINDER_H

// End of File