localconnectivityservice/generichid/inc/hidreportgenerator.h
author hgs
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/*
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* Copyright (c) 2005-2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Report generator
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*
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*/
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#ifndef C_REPORT_GENERATOR_H
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#define C_REPORT_GENERATOR_H
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#include "hidreportroot.h"
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#include "hidtranslate.h"
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/**
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 * HID report generator
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 *
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 * Class used for generating output or feature reports to send to the device.
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 *
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 * @lib  generichid.lib
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 * @since S60 v5.0
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 */
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class CReportGenerator : public CBase
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    {
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public:
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    /**
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     * Constructs a CReportGenerator.
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     *
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     * @since S60 v5.0
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     * @param aReportRoot Tree generated by CParser from the report
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     *                    descriptor.
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     * @param aReportId Report ID of the report to generate.
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     * @param aType Type of report to generate (output or feature).
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     */
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    IMPORT_C static CReportGenerator* NewLC(const CReportRoot* aReportRoot,
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        TInt aReportId, CField::TType aType);
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    /**
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     * Constructs a CReportGenerator.
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     *
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     * @since S60 v5.0
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     * @param aReportRoot Tree generated by CParser from the report
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     *                    descriptor.
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     * @param aReportId Report ID of the report to generate.
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     * @param aType Type of report to generate (output or feature).
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     */
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    IMPORT_C static CReportGenerator* NewL(const CReportRoot* aReportRoot,
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        TInt aReportId, CField::TType aType);
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    virtual ~CReportGenerator();
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    /**
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     * Sets the value of a single field in the report.  Stores the requested
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     * control value in a field in the report buffer.  For array fields, adds
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     * the requested usage ID to the array.
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     *
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     * @since S60 v5.0
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     * @param aField Pointer to the field in which to set a value.
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     * @param aUsageId Usage ID of the control to set.
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     * @param aValue Value to write to the field, used for variable
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     *               fields only.
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     * @param aControlOffset Which control to set when more than one
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     *                       have the same usage ID.
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     * @return Error code indicating success or reason for failure.
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     */
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    IMPORT_C TInt SetField(const CField* aField, TInt aUsageId, TInt aValue,
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        TInt aControlOffset = 0);
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    /**
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     * Get the buffer holding the generated report
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     *
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     * @since S60 v5.0
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     * @return pointer to buffer
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     */
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    IMPORT_C TPtr8 Report();
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private:
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    /**
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     * Constructor for CReportGenerator.
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     *
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     * @since S60 v5.0
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     * @param aReportId Report ID of the report to generate.
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     * @param aType Type of report to generate (output or feature).
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     */
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    CReportGenerator(TInt aReportId, CField::TType aType);
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    /**
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     * 2nd phase constructor for CReportGenerator.  Allocates the
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     * report buffer iBuf.
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     *
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     * @since S60 v5.0
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     * @param aReportRoot Tree generated by CParser from the report
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     *                    descriptor.
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     */
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    void ConstructL(const CReportRoot* aReportRoot);
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    /**
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     * Report ID of the report to generate
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     */
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    TInt iReportId;
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    /**
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     * Type of report to generate
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     */
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    CField::TType iType;
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    /**
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     * Tree of fields from the report descriptor
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     * Not own.
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     */
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    const CReportRoot* iReportRoot;
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    /**
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     * Buffer to hold the generated report
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     * Own.
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     */
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    HBufC8* iBuf;
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    };
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#endif  // __REPORT_GENERATOR_H__