capturingkeys.cpp

用来学习 焦点 的 的例子,可以 好好看看焦点在 symbian中很重要,

#include <APGWGNAM.H>
#include "capturingkeys.h"


CKeyCapturer* CKeyCapturer::NewL(MKeyCallBack& aObserver)
	{
	CKeyCapturer* self = CKeyCapturer::NewLC(aObserver);
	CleanupStack::Pop(self);
	return self;
	}
 
CKeyCapturer* CKeyCapturer::NewLC(MKeyCallBack& aObserver)
	{
	CKeyCapturer* self = new (ELeave) CKeyCapturer(aObserver);
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}
 
CKeyCapturer::CKeyCapturer(MKeyCallBack& aObserver)
:CActive(EPriorityStandard),iObserver(aObserver),iHandle(-1)
{
}
 
CKeyCapturer::~CKeyCapturer()
{
	if(iHandle > -1)
	{
		iWg.CancelCaptureKey(iHandle);
	}
	
	iHandle = -1;
	
	Cancel();
	
	iWg.Close();
	iWsSession.Close();	
}
 
void CKeyCapturer::ConstructL()
{
	CActiveScheduler::Add(this);
	
	User::LeaveIfError(iWsSession.Connect());
 
	iWg=RWindowGroup(iWsSession);
	User::LeaveIfError(iWg.Construct((TUint32)&iWg, EFalse));
	iWg.SetOrdinalPosition(-1);
	iWg.EnableReceiptOfFocus(EFalse);
 
	CApaWindowGroupName* wn=CApaWindowGroupName::NewLC(iWsSession);
	wn->SetHidden(ETrue);
	wn->SetWindowGroupName(iWg);
	CleanupStack::PopAndDestroy();
 
	iHandle = iWg.CaptureKey(EKeyUpArrow, 0,0);
	Listen();
}
 
void CKeyCapturer::RunL()
{
	if (iStatus == KErrNone) 
	{
		TWsEvent e;
		iWsSession.GetEvent(e);
	
		if(iObserver.KeyCapturedL(e))
		{	
			TInt wgId = iWsSession.GetFocusWindowGroup();
			iWsSession.SendEventToWindowGroup(wgId, e);
		}
	}
	
	if (iStatus != KErrCancel) 
	{
		Listen();
	}
}
 
void CKeyCapturer::DoCancel()
{
	iWsSession.EventReadyCancel();
}
 
void CKeyCapturer::Listen()
{
	iWsSession.EventReady(&iStatus);
	SetActive();
}