systemagentdocument.cpp

来自「series60 应用程序开发的源代码 series60 应用程序开发的源代码」· C++ 代码 · 共 115 行

/**
* 
* @brief Definition of CSystemAgentDocument
*
* Copyright (c) EMCC Software Ltd 2003
* @version 1.0
*/

// INCLUDE FILES

// Class include
#include "SystemAgentDocument.h"

// User includes
#include "SystemAgentAppUi.h"    // CSystemAgentAppUi

// ================= MEMBER FUNCTIONS =======================

/**
* Constructs the document for aApp
*
* @param aApp for which the document is constructed
*/
CSystemAgentDocument::CSystemAgentDocument(CEikApplication& aApp)
:CAknDocument(aApp), 
 iSystemAgentState(ESystemAgentRed)
{
}

/**
* Symbian OS 2nd phase constructor.
*
*/
void CSystemAgentDocument::ConstructL()
{
    // Connect to the System Agent
    User::LeaveIfError(iSAVarChangeNotify.Connect());

    // Set initial value for our state and notify System Agent of it
    SetSystemAgentStateVarL(ESystemAgentRed);
}

/**
* Symbian OS 2nd phase constructor.
* Constructs the CSystemAgentDocument using the constructor and the ConstructL 
* method.
* @param aApp for which the CSystemAgentDocument is constructed
* @return The newly constructed CSystemAgentDocument
*/
CSystemAgentDocument* CSystemAgentDocument::NewL(CEikApplication& aApp)
{
    CSystemAgentDocument* self = new (ELeave) CSystemAgentDocument(aApp);
    CleanupStack::PushL(self);
    self->ConstructL();
    CleanupStack::Pop(self);
    return self;
}

/**
* Destructor.
* Releases our state variable and closes the connection to the System Agent.
*/
CSystemAgentDocument::~CSystemAgentDocument()
{
    iSAVarChangeNotify.ReleaseVariable(KUidSystemAgentStateVariable);
    iSAVarChangeNotify.Close();
}


/**
* Creates the AppUi for this document.
* @return The newly constructed AppUi
*/    
CEikAppUi* CSystemAgentDocument::CreateAppUiL()
{
    return new (ELeave) CSystemAgentAppUi;
}


/**
* Demonstrates notifying the System Agent of a change in a state variable
*/
void CSystemAgentDocument::SetSystemAgentStateVarL(TSystemAgentStatus aState)
{
    // Update our internal state and notify the System Agent that our state has changed
    iSystemAgentState = aState;
    iSAVarChangeNotify.NotifySaVarChangeL(KUidSystemAgentStateVariable, iSystemAgentState);
}

/**
 * Simply changes our state to a different value
 */
void CSystemAgentDocument::ChangeSystemAgentStateVarL()
{
    // Change our state to a different color
    TSystemAgentStatus newState = ESystemAgentRed;
    if (iSystemAgentState == ESystemAgentRed)
    {
        newState = ESystemAgentGreen;
    }
    else if (iSystemAgentState == ESystemAgentGreen)
    {
        newState = ESystemAgentBlue;
    }
    else if (iSystemAgentState == ESystemAgentBlue)
    {
        newState = ESystemAgentRed;
    }

    SetSystemAgentStateVarL(newState);
}


// End of File