audio4eng.cpp

来自「Symbian OS C++ 程序开发事例」· C++ 代码 · 共 96 行

/* Copyright (c) 2004, Symbian Software Ltd. All rights reserved */

#ifndef __Audio4ENG_H_
#define __Audio4ENG_H_

#include "Audio4eng.h"
#include "Audio4Ui.h"
#include "Audio4.hrh"

static const TInt KFrequency = 2600;
static const TInt KDuration = 3000000;

CAudio4Engine::CAudio4Engine(CAudio4Ui& aAppUi) : 
	iAppUi(aAppUi),
    iState(ENotReady)
    {
    }

CAudio4Engine* CAudio4Engine::NewL(CAudio4Ui& aAppUi)
    {
    CAudio4Engine* self = NewLC(aAppUi);
    CleanupStack::Pop();  // self
    return self;
    }

CAudio4Engine* CAudio4Engine::NewLC(CAudio4Ui& aAppUi)
    {
    CAudio4Engine* self = new (ELeave) CAudio4Engine(aAppUi);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }

void CAudio4Engine::ConstructL()
    {
	iUtility=CMdaAudioToneUtility::NewL(*this);
	iUtility->PrepareToPlayTone(KFrequency, TTimeIntervalMicroSeconds(KDuration));
    }

CAudio4Engine::~CAudio4Engine()
    {
    delete iUtility;    
    iUtility = NULL;
    }


void CAudio4Engine::PlayL()
	{
	iUtility->Play();
	iState=EPlaying;
	}

void CAudio4Engine::StopL()
	{
	iUtility->CancelPlay();
	iState=EReady;
	}

void CAudio4Engine::MatoPrepareComplete(TInt aError)
    {
	if (aError == KErrNone)
		{	
		iUtility->SetVolume(iUtility->MaxVolume());
		iState=EReady;
		}	
    }

void CAudio4Engine::MatoPlayComplete(TInt /*aError*/)
    {
	iState = EReady;
    }


void CAudio4Engine::UpdateMenu(CEikMenuPane* aMenuPane)
    {
	switch(iState)
		{
		case ENotReady:
			aMenuPane->SetItemDimmed(ECmdOpenFile, EFalse);
			aMenuPane->SetItemDimmed(ECmdPlay, ETrue);
			aMenuPane->SetItemDimmed(ECmdStop, ETrue);
			break;

		case EReady:
			aMenuPane->SetItemDimmed(ECmdPlay, EFalse);
			aMenuPane->SetItemDimmed(ECmdStop, ETrue);
			break;

		case EPlaying:
			aMenuPane->SetItemDimmed(ECmdPlay, ETrue);
			aMenuPane->SetItemDimmed(ECmdStop, EFalse);
			break;
		}
	}

#endif// __Audio4ENG_H_