This article will show you how you can control the behaviour of your application so that it knows when it gains or looses the screen focus and how to control it.
Being notified of the focus change
The Series 60 framework will notify an application when it gains or looses the screen focus through a call to CAknAppUi::HandleForegroundEventL(TBool aForeground). The aForeground parameter equals ETrue when your app gains the screen focus, and EFalse when it looses it.
If you need to do some specific stuff, you should override this function (and call the base class implementation). Here is an example for an application that don't want to loose the focus:
void CMyAppUi::HandleForegroundEventL(TBool aForeground)
{
// Call Base class method
CAknAppUi::HandleForegroundEventL(aForeground);
if(aForeground)
{
// We have gained the focus
...
}
else
{
// We have lost the focus
...
}
}
Changing the focus
You can also request to change the focus of your application. The commands are TApaTask::SendToBackground() and TApaTask::BringToForeground().
Here is how you can use them (from the AppUi):
void CMyAppUi::BringToForeground()
{
// Construct en empty TApaTask object
// giving it a reference to the Window Server session
TApaTask task(iEikonEnv->WsSession( ));
// Initialise the object with the window group id of
// our application (so that it represent our app)
task.SetWgId(CEikonEnv::Static()->RootWin().Identifier());
// Request window server to bring our application
// to foreground
task.BringToForeground();
}
I never tested the following code, but you may be able to control the focus of other applications by using:
// Bring the application "theApp" to background
TApaTaskList tasklist(iCoeEnv->WsSession());
TApaTask task(tasklist.FindApp(_L("theApp")));
task.SendToBackground(); // or BringToForeground()
So what say you, is it even possible to override phone priority?
Truly hope so...
thx, pzn
I have a server that listens to incoming voice calls and displays a global confirmation dialog when a call is received. The confirmation dialog is always displayed "beneath" the phone app which comes to foreground.
Is there any way of bringing my dialog to foreground or taking the phone app to background?
Try moving an application to foreground / to background when it's property in CApaWindowGroupName is hidden, e.g. it's not shown in the tasklist. Then TApaTaskList will never find it.
You migth be better of using for bringin the app to foreground:
RWsSession ws;
User::LeaveIfError(ws.Connect());
ws.SetWindowGroupOrdinalPosition(iWindowsGroupID, 0);
ws.Close();
iWindowsGroupID is a member variable where is store my WindowsGroupId just before loosing focus/being sent to background.
To send it to background:
RWsSession ws;
User::LeaveIfError(ws.Connect());
iWindowsGroupID= ws.GetFocusWindowGroup();
ws.SetWindowGroupOrdinalPosition(iWindowsGroupID, -1);
ws.Close();
Please can u explain me in brief about ur code. I want to know what should be the iWindowsGroupId. whether we should give any value for it.
Or can u help me in writing a code for moving any of our nokia applications to foreground from another application. Please Its urgent.
hiiii,
acctually i m also suffering with the same problem. if u find then help me.
Hello.
Your code worked.
One question thought.... How do i listen for system events for example? More exactly how do i measure system idle periods? (remember that my application runs in the background...)
So, what i want to do is make my application pop-up (run in foreground) after 10sec of inactivity from the user with the phone.
How do i do this?
Lucian
Has anybodu got success in setting application forground during incoming call
Let me know i need it very urgently.
Hi all!!
I can't connect to the RWsSession. I get the following error
error LNK2019: unresolved external symbol "public: int __thiscall RWsSession::Connect(void)"
I tried both Eric's and kundutech's sugestions
Help please!!
Many Thanks!!!!! :) :)