audio4eng.cpp

来自「Symbian OS C++ 手机应用开发（第一卷）部分事例代码」· 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) : 
    iState(ENotReady),
    iAppUi(aAppUi)
    {
    }

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_