--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mpxplugins/viewplugins/views/equalizerview/inc/mpxequalizerhelper.h	Thu Dec 17 08:45:05 2009 +0200
@@ -0,0 +1,223 @@
+/*
+* Copyright (c) 2006 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:  Helper class for managing equalizer utility instances.
+*
+*/
+
+
+
+#ifndef C_MPXEQUALIZERHELPER_H
+#define C_MPXEQUALIZERHELPER_H
+
+
+//  INCLUDES
+#include <EqualizerPresetsDialog.h>
+#include <mdaaudiosampleplayer.h>
+#include <mpxplaybackobserver.h>
+
+#include "mpxequalizerview.h"
+
+
+// FORWARD DECLARATIONS
+class MMPXPlaybackUtility;
+class CAudioEqualizerUtility;
+class CEqualizerPresetsDialog;
+
+
+// CLASS DECLARATION
+
+/**
+ *  Helper class for managing equalizer utility instances.
+ *
+ *  @lib mpxplaybackview.lib
+ *  @since S60 v3.0
+ */
+NONSHARABLE_CLASS( CMPXEqualizerHelper ) : public CMPXEqualizerView,
+                                           public MMPXPlaybackObserver,
+                                           public MEqualizerPresetActivationObserver,
+                                           public MMdaAudioPlayerCallback
+    {
+public:
+
+    /**
+     * Two-phased constructor.
+     *
+     * @since 3.0
+     * @return Pointer to newly created object.
+     */
+    static CMPXEqualizerHelper* NewL();
+
+    /**
+     * Destructor.
+     */
+    virtual ~CMPXEqualizerHelper();
+
+private:
+
+    /**
+     * C++ default constructor.
+     */
+    CMPXEqualizerHelper();
+    
+    /**
+     * By default Symbian 2nd phase constructor is private.
+     */
+    void ConstructL();
+
+    /**
+     * Initialize audio equalizer utility for current active playing track.
+     */
+    void InitializeEqualizerUtilityL();
+
+    /**
+     * Release audio equalizer utility.
+     */
+    void ReleaseEqualizerUtility();
+
+    /**
+     * Get current preset ID.
+     *
+     * @param aPresetId On return, Current preset ID.
+     * @return Index to the preset array if found.
+     *         KErrNotFound if not found.
+     */
+    TInt GetPresetId( TInt& aPresetId );
+
+    /**
+     * Initialize secondary audio equalizer utility
+     * for situations when the engine cannot provide one.
+     */
+    void InitializeBackupEqualizerUtilityL();
+
+    /**
+     * Create secondary audio equalizer utility
+     * based on latest preset settings.
+     */
+    void CreateBackupEqualizerUtility();
+
+    /**
+     * Setup active equalizer utility for equalizer dialog.
+     */
+    void SetupActiveEqualizerUtility();
+
+    /**
+     * Launch equalizer dialog.
+     */
+    void DoLaunchEqualizerDialogL();
+
+    /**
+     *  Handle playback message
+     *
+     *  @param aMessage playback message
+     */
+    void DoHandlePlaybackMessageL( 
+        const CMPXMessage& aMessage );
+
+    /**
+     *  Handle playback state changed.
+     *
+     *  @param aState New Playback state
+     */
+    void DoHandleStateChangedL(
+        TMPXPlaybackState aState );
+
+// from base class CMPXEqualizerView
+
+    /**
+     * From CMPXEqualizerView
+     * Launch equalizer dialog.
+     *
+     * @since 3.0
+     */
+    void LaunchEqualizerL();
+
+// from base class MMPXPlaybackObserver
+
+    /**
+     * From MMPXPlaybackObserver
+     * Handle playback message
+     * 
+     * @param aMessage playback message
+     * @param aErr system error code.
+     */
+    void HandlePlaybackMessage( CMPXMessage* aMessage, TInt aError );
+    
+// from base class MEqualizerPresetActivationObserver
+
+    /**
+     * From MEqualizerPresetActivationObserver
+     * Handle preset id activation from Equalizer dialog.
+     * 
+     * @param aActivatedPreset Current activated preset id.
+     */
+    void HandlePresetActivation( TInt aActivatedPreset );
+
+// from base class MMdaAudioPlayerCallback
+
+    /**
+     * From MMdaAudioPlayerCallback.
+     * Callback when an attempt to open and initialise an audio sample 
+     * has completed.
+     *
+     * @param aError The status of the audio sample after initialisation.
+     * @param aDuration The duration of the audio sample.
+     */
+    void MapcInitComplete(
+        TInt aError,
+        const TTimeIntervalMicroSeconds& aDuration );
+
+    /**
+     * From MMdaAudioPlayerCallback.
+     * Callback when an attempt to playback an audio sample has completed.
+     *
+     * @param aError The status of playback.
+     */
+    void MapcPlayComplete( TInt aError );
+
+private:    // Data
+
+    // Pointer to the equalizer utility we use. 
+    // This is either the equalizer utility provided by Music
+    // Player Engine or iBackupEqualizerUtility.
+    CAudioEqualizerUtility* iEqualizerUtility;          // not owned
+
+    // Play utility used to open the 'null sound' file and
+    // create iBackupEqualizerUtility
+    CMdaAudioPlayerUtility* iPlayUtility;               // owned
+
+    // Equalizer utility for the active playback utility
+    CAudioEqualizerUtility* iAudioEqualizerUtility;     // owned
+
+    // Backup equalizer utility instance used when the equalizer custom
+    // interface cannot be created by using the active play utility
+    CAudioEqualizerUtility* iBackupEqualizerUtility;   // owned
+
+    // Current playback utility
+    MMPXPlaybackUtility* iPlaybackUtility;  // not own, but need to close
+
+    CEqualizerPresetsDialog* iEqDialog;     // not own
+
+    // Should be launch equalizer dialog on open complete callback
+    TBool iLaunchEqualizerOnOpenComplete;
+
+    // iPlayUtility->OpenL() has been called but not yet completed
+    TBool iOpenInProgress;
+    
+    // Used to syncronize backup equalizer creation and dialog launching
+    CActiveSchedulerWait* iWait;
+    };
+
+#endif  // C_MPXEQUALIZERHELPER_H
+
+// End of File