cflashinghello.cpp

symbian活动对象的例子

// CFlashingHello.cpp
//
// Copyright (c) 2002 Symbian Ltd.  All rights reserved.

#include "cflashinghello.h"

#include "cactivehelloappview.h"

// flashing hello

// construct/destruct

CFlashingHello* CFlashingHello::NewL(CActiveHelloAppView* aAppView)
	{
	CFlashingHello* self=new(ELeave) CFlashingHello;
	CleanupStack::PushL(self);
	self->ConstructL(aAppView);
	CleanupStack::Pop(self);
	return self;
	}

CFlashingHello::CFlashingHello()
	: CActive(0)
	{
	CActiveScheduler::Add(this);
	}

void CFlashingHello::ConstructL(CActiveHelloAppView* aAppView)
	{
	iAppView=aAppView;
	User::LeaveIfError(iTimer.CreateLocal());
	}

CFlashingHello::~CFlashingHello()
	{
	Cancel();
	iTimer.Close();
	}

// request

void CFlashingHello::Start(TTimeIntervalMicroSeconds32 aHalfPeriod)
	{
	_LIT(KFlashingHelloPeriodPanic, "CFlashingHello");
	__ASSERT_ALWAYS(!IsActive(), User::Panic(KFlashingHelloPeriodPanic, 1));
	// Remember half-period
	iHalfPeriod=aHalfPeriod;

	// Hide the text, to begin with
	ShowText(EFalse);

	// Issue request
	iTimer.After(iStatus, iHalfPeriod);
	SetActive();
	}

// from CActive

void CFlashingHello::RunL()
	{
	// Change visibility of app view text
	ShowText(!iAppView->iShowText);

	// Re-issue request
	iTimer.After(iStatus, iHalfPeriod);
	SetActive();
	}

void CFlashingHello::DoCancel()
	{
	// Ensure text is showing
	ShowText(ETrue);

	// Cancel timer
	iTimer.Cancel();
	}

void CFlashingHello::ShowText(TBool aShowText)
	{
	iAppView->iShowText=aShowText;
	iAppView->DrawNow();
	}