author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 16:07:20 +0300 | |
branch | RCL_3 |
changeset 17 | 0fd27995241b |
permissions | -rw-r--r-- |
17
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/* |
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* Copyright (c) 2005 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: Group for equalizer controls |
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* |
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*/ |
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#ifndef CAMMSEQUALIZERCONTROLGROUP_H |
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#define CAMMSEQUALIZERCONTROLGROUP_H |
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// INCLUDES |
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#include <e32base.h> |
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#include "cammseffectcontrolgroup.h" |
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#include <AudioEqualizerData.h> |
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// CONSTANTS |
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_LIT(KAMMSEqualizerControlClassName, |
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".amms.control.audioeffect.EqualizerControl"); |
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|
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|
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// FORWARD DECLARATIONS |
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class CAMMSBaseEqualizerControl; |
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class CAudioEqualizerUtility; |
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|
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// CLASS DECLARATION |
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/** |
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* Group for equalizer controls |
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* |
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* @since 3.0 |
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*/ |
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NONSHARABLE_CLASS(CAMMSEqualizerControlGroup): public CAMMSEffectControlGroup |
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{ |
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public: // Constructors and destructor |
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|
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/** |
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* Two-phased constructor. |
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*/ |
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static CAMMSEqualizerControlGroup* NewLC(); |
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|
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/** |
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* Destructor. |
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*/ |
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~CAMMSEqualizerControlGroup(); |
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|
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public: // New functions |
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/** |
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* Gets the band that has the most effect on the given frequency |
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* |
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* @param aFrequency The frequency in milliHertz which is |
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* to be equalized via the returned band |
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* |
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* @return The frequency band that has most effect on the given |
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* frequency or -1 if no band has effect on the given frequency |
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*/ |
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TInt Band(TInt aFrequency); |
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/** |
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* Gets the gain set for the given equalizer band. |
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* |
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* @param aBand The frequency band whose gain is asked. |
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* @param aBandLevel The returned level for the given band in millibels. |
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* |
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*/ |
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void GetBandLevelL(TInt aBand, TInt& aBandLevel); |
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/** |
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* Gets the bass level. |
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* |
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* @return The current level that is set to the bass band. If the |
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* bass level cannot been defined EqualizerControl.UNDEFINED will |
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* be returned |
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*/ |
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TInt Bass(); |
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/** |
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* Gets the center frequency of the given band |
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* |
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* @param aBand The frequency band whose center frequency |
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* is asked. |
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* @param aCenterFreq The returned center frequency in milliHertz. |
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*/ |
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void GetCenterFreqL(TInt aBand, TInt& aCenterFreq); |
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/** |
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* Returns the maximum band level supported |
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* |
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* @return the maximum band level supported |
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*/ |
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TInt MaxBandLevel(); |
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/** |
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* Returns the minimum band level supported. |
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* |
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* @return the minimum band level supported. |
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*/ |
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TInt MinBandLevel(); |
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|
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/** |
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* Gets the number of frequency bands that the equalizer supports. |
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* |
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* @return the number of frequency bands that the equalizer supports. |
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*/ |
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TInt NumberOfBands(); |
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|
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/** |
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* Gets the treble level. |
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* |
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* @return The current level that is set to the treble band. If the |
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* treble level cannot been defined EqualizerControl.UNDEFINED will |
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* be returned |
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*/ |
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TInt Treble(); |
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|
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/** |
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* Sets the given equalizer band to the given gain value. |
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* |
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* @param aLevel The new gain in millibels that will be set to the |
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* given band |
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* @param aBand The frequency band that will have the new gain |
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*/ |
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void SetBandLevelL(TInt aLevel, TInt aBand); |
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|
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/** |
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* Sets the bass level using a linear point scale with values between |
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* 0 and 100: a value of 0 applies the maximum available attenuation |
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* to frequencies in the bass band; a value of 50 gives a flat |
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* equalization of the bass band; and a value of 100 applies the |
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* maximum available amplification to frequencies in the bass band. |
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* |
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* @param aLevel The new level on a linear point scale that will |
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* be set to the bass band |
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* @param aSetLevel Returned level that was actually set |
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*/ |
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void SetBassL(TInt aLevel, TInt& aSetLevel); |
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|
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/** |
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* Sets the treble level using a linear point scale with values between |
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* 0 and 100: a value of 0 applies the maximum available attenuation to |
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* frequencies in the treble band; a value of 50 gives a flat |
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* equalization of the treble band; and a value of 100 applies the |
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* maximum available amplification to frequencies in the treble band |
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* |
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* @param aLevel The new level on a linear point scale that will |
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* be set to the treble band |
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* |
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* @param aSetLevel Returned level that was actually set |
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*/ |
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void SetTrebleL(TInt aLevel, TInt& aSetLevel); |
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|
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private: // New functions |
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/** |
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* Gets control. Ownership is not tranferred. |
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* |
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* @param aIndex Control index. |
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*/ |
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CAMMSBaseEqualizerControl* TypeSafeControl(TInt aIndex) const; |
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|
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/** |
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* Checks whether the band index is between 0 and number of bands -1. |
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* Function leaves with KErrArgument if the band is not between the |
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* limits. |
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*/ |
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void CheckBandIndexL(TInt aBand) const; |
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|
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/** |
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* Gets bands corresponding to the given preset index. |
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* The data is obtained from controls (or from empty group utility, if the |
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* group has no controls). |
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* @param aPresetIndex Index of the preset whose bands are asked |
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* @param aBands Returned bands |
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*/ |
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void GetPresetBandsL(TUint aPresetIndex, |
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RArray< TEfAudioEqualizerBand >& aBands); |
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|
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public: // Functions from base classes |
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/** |
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* Returns class name that identifies this control group. |
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* |
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* @return Control group name. |
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*/ |
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const TDesC16& ClassName(); |
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|
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protected: // Functions from base classes |
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/** |
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* Called by when a new player is added |
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* |
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* @param aPlayer The player being added |
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* @param aControl The player's control relevant to this group |
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*/ |
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void NotifyPlayerAddedL(CMMAPlayer *aPlayer, CMMAControl* aControl); |
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|
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/** |
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* Called when the current preset changes |
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*/ |
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void PresetChangedL(); |
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/** |
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* Finish initialization (after the 1st player is added) |
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*/ |
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void InitializeL(); |
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/** |
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* Creates utilities that can be used to obtain preset names |
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* and preset data (needed when the group has no controls). |
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* Does nothing if the utility already exists. |
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*/ |
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void PrepareEmptyGroupUtilitiesL(); |
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/** |
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* Deletes utilities that are used to obtain preset names |
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* and preset data (needed when the group has no controls). |
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* Does nothing if the utilities have already been deleted. |
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*/ |
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void DeleteEmptyGroupUtilities(); |
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/** |
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* Gets list of preset names available. |
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* @param aPresetNames Returned preset names |
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*/ |
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void GetPresetNamesL(CDesCArray& aPresetNames); |
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protected: |
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/** |
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* C++ default constructor. |
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*/ |
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CAMMSEqualizerControlGroup(); |
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/** |
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* By default Symbian 2nd phase constructor is private. |
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*/ |
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void ConstructL(); |
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private: // data |
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// Needed to get preset names when the group has no controls. |
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CAudioEqualizerUtility* iEmptyAudioEqualizerUtility; // Owned. |
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RArray< TEfAudioEqualizerBand > iBands; |
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TInt iBass; // bass level |
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TInt iTreble; // treble level |
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TInt iMaxBandLevel; |
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TInt iMinBandLevel; |
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}; |
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#endif // CAMMSEQUALIZERCONTROLGROUP_H |
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