How to hide CBA's ?

[IngeSchmidt]

HI !

I want to use the CBA-buttons ( cba=R_AVKON_SOFTKEYS_OK_CANCEL ), but I don't know how ;-(
I read different threads and in some postings people sugguest to use the following code:


// Code
CEikButtonGroupContainer* pCba = CEikButtonGroupContainer::Current();
pCba->MakeVisible(EFalse);

The OK / Cancel is not showing, but the following CBA is showing: " Options ^ Exit "

I didn't define this CBA in my code ...

Is there any developer, who can explain me that behavior and ( more important ) say me, how to hide the OK / Cancel CBA-Define
correctly ?

Thanks . . .

Greeting
IngeS

[stenlik]

Hi,

this behavoiur looks quite strange, but it is normal belive me.

You can use CBA buttons in two ways. If your application has only one view with one defined and displayde button array(called CBA), this piece of code is enough:

CEikButtonGroupContainer* cba = CEikButtonGroupContainer::Current();
cba->MakeVisible(EFalse);

You must of course redraw the screen to fill "bigger" screen.
Everything is OK.

But in some situations this technique fails.

The button container can hold many CBAs, but only one button array is currently displayed. When you have a view with CBA and you (for example) use a dialog with hidden buttons and in the dialog method PostLayoutDynInitL() you wil using previous technique to hide CBA buttons you will be probably surprised that ofter pressing button menu pane from underlaying view will be displayed. It looks like a bug, but it is correct. The framework just pass the key commend to first CBA which is "visible", even if is under your dialog and not diplayed on the screen. You have two possiblities how to solve such problem. The straight one is to call MaheVisible(EFalse) also on view CBA. But basically you dont know if there are not any other CBAs. The better solution is here:

// get current CBAs
CEikButtonGroupContainer* cba = CEikButtonGroupContainer::Current();

// get position of first button in CBA
TInt posOptions = cba->PositionById(EAknSoftkeyOptions);
cba->UpdateCommandObserverL(posOptions,*this);
// get position of second button in CBA
TInt posBack = cba->PositionById(EAknSoftkeyBack);
cba->UpdateCommandObserverL(posBack,*this);

You obtain a pointer to current CBA, get the button position (by calling PositionById(), which has Command ID as a parameter. Command ID is specified in resource CBA in .rss file, I use predefined AVKON CBA, so EAknSoftkeyOptions and EAknSoftkeyBack I found in avkon.hrh file). After having position you call UpdateCommandObserverL() method. The second parameter points to implemented mixin class MEikCommandObserver. It has method ProcessCommandL() which will consume the pressing on cba. Now you can call MakeVisible(EFalse) on dialog CBA. The menu pane of underlying view will not show.


Summarize
--------------
If you want to hide a current CBA and there is another second CBA you must provide the new command observer to such CBA and consume its commands.

Bye
STeN

[IngeSchmidt]

HI !

First of all, a big THANK YOU to you STeN for reply.
But I have Problems to understand the solution. You wrote, that there is showing the 2th CBA define of the next view.
You have right, if you guess, that I have different views, but the 2th view has the same CBA define ( cba=R_AVKON_SOFTKEYS_OK_CANCEL ),
so where is the OPTIONS/BACK-Define from ?

BTW, I tried your code and it doesn't work - surely my fault. The ConstructL - Func of my Container is the following now:


void CTrousersContainer::ConstructL(const TRect& aRect)
{
CreateWindowL();

// get current CBAs
CEikButtonGroupContainer* cba = CEikButtonGroupContainer::Current();

// get position of first button in CBA
TInt posOptions = cba->PositionById(EAknSoftkeyOk);
cba->UpdateCommandObserverL(posOptions,*this);

// get position of second button in CBA
TInt posBack = cba->PositionById(EAknSoftkeyCancel);
cba->UpdateCommandObserverL(posBack,*this);

SetRect(aRect);
ActivateL();

}

and the ProcessCommand:



void CTrousersContainer::ProcessCommandL(TInt iCommand)
{
CEikButtonGroupContainer* cba = CEikButtonGroupContainer::Current();
cba->MakeVisible(EFalse);

DrawNow();
}


First, I see the "OK CANCEL", after click on ok, I see "OPTIONS ^ BACK". Where is my mistake ?


Greetings
IngeS

[kota]

Hi, I use
CEikButtonGroupContainer* iCba
as menu in my videoplayer, when i go to Full Screen view i wanna hide
and deactivate it.
I am trying to do it via iCba->MakeVisible(EFalse) - and, indeed, it
hides the menu form the view.

BUT - its still reacts to right/left menu button pressed in some wierd
maner. it doesnt produces the commands assigned to it (before hiding).
i am failed to figure out what commands it produce and where to catch
it.

as i know iCba->MakeVisible(EFalse) should substitute my cba with some
NULL cba, but it doesn seems that way.

any ideas?

the button pressed is also didnt catch in OfferKeyEventL of the control. tried to catch it that way:

if (aType==EEventKeyDown && (aKeyEvent.iScanCode == EStdKeyDevice0 || aKeyEvent.iScanCode == EStdKeyDevice1))

{

DO something

}

[misfit.physics]

find the buttons = R_AVKON_SOFTKEYS_OPTIONS_EXIT in your rss file and replace it with R_AVKON_SOFTKEYS_OK_CANCEL.

[kkrish]

you can also change the text of the cba button by
Cba()->SetCommandL (EAknSoftkeyBack, _L("Hide"));
Cba()->DrawNow();

write it in DoActivateL if you hav eview container architecture.

[misfit.physics]

i tried your suggestion, it has an access violation something in the cba declaration line. And i cant understand why. I'm just trying to make a pop-up menu and change the softkey labels....out of curiosity...

------------------------------------------

iMenuBar = ((CAknView*)iParent)->MenuBar();
iMenuBar->SetMenuTitleResourceId(R_PRADDRESS_LIST_OPTIONS_MENU);
---------------------------------------------------
CEikButtonGroupContainer *cba = iAppUi->Cba(); <------ACCESS VIOLATION! CAN ANYONE POINT OUT?
-------------------------------------------------------
cba->SetCommandL(EAknSoftkeySelect, _L("vSelect"));
cba->SetCommandL(EAknSoftkeyCancel, _L("vCancel"));

[misfit.physics]

this is in the container class by the way. "iAppUi" is a pointer to the view class..

[kkrish]

do it like this

void C3MainView::DoActivateL(const TVwsViewId& /*aPrevViewId*/,TUid /*aCustomMessageId*/,const TDesC8& /*aCustomMessage*/)
{
iView = new(ELeave) C3MainContainer;
iView->SetMopParent(this);

TRect cr = ClientRect();
if (cr.iTl.iY == Kqpn_height_status_pane_idle)
{
cr.iTl.iY = Kqpn_height_status_pane_usual;
}
iView->ConstructL(cr);
AppUi()->AddToStackL(*this,iView);
Cba()->SetCommandL (EAknSoftkeyBack, _L("Hide"));
Cba()->DrawNow();
}