diff -r dbfb5e38438b -r 305818acdca4 taskswitcher/utils/src/tswindowgroupsmonitor.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/taskswitcher/utils/src/tswindowgroupsmonitor.cpp	Mon Sep 13 13:26:33 2010 +0300
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * This component and the accompanying materials are made available
+ * under the terms of "Eclipse Public License v1.0"
+ * which accompanies this distribution, and is available
+ * at the URL "http://www.eclipse.org/legal/epl-v10.html".
+ *
+ * Initial Contributors:
+ * Nokia Corporation - initial contribution.
+ *
+ * Contributors:
+ *
+ * Description :
+ *
+ */
+#include "tswindowgroupsobserver.h"
+#include <apgwgnam.h>
+
+const int KOrdinalPositionNoZOrder(-1);
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+CTsWindowGroupsMonitor* CTsWindowGroupsMonitor::NewL(MTsResourceManager &resources)
+{
+    CTsWindowGroupsMonitor* self = new (ELeave) CTsWindowGroupsMonitor(resources);
+    CleanupStack::PushL(self);
+    self->ConstructL();
+    CleanupStack::Pop(self);
+    return self;
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+CTsWindowGroupsMonitor::CTsWindowGroupsMonitor(MTsResourceManager &resources)
+:
+    CActive(EPriorityStandard),
+    mResources(resources)
+{
+    CActiveScheduler::Add(this);
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::ConstructL()
+{
+    
+    // Initial window group
+    mWg = RWindowGroup (mResources.WsSession());
+    User::LeaveIfError (mWg.Construct ((TUint32)&mWg, EFalse));
+    mWg.SetOrdinalPosition (KOrdinalPositionNoZOrder);
+    mWg.EnableReceiptOfFocus (EFalse);
+    
+    // Hide window
+    CApaWindowGroupName* wn = CApaWindowGroupName::NewLC(mResources.WsSession());
+    wn->SetHidden (ETrue);
+    wn->SetWindowGroupName (mWg);
+    CleanupStack::PopAndDestroy (wn);
+    
+    // Window group change event
+    User::LeaveIfError (mWg.EnableGroupListChangeEvents());
+    Subscribe();
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+CTsWindowGroupsMonitor::~CTsWindowGroupsMonitor()
+{
+    CActive::Cancel();
+    mWg.Close();
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::SubscribeL(MTsWindowGroupsObserver &observer)
+{
+    const TInt offset(mObservers.Find(&observer));
+    KErrNotFound == offset ? mObservers.InsertL(&observer, 0) : 
+                             User::Leave(KErrAlreadyExists);
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::Cancel(MTsWindowGroupsObserver & observer)
+{
+    const TInt offset(mObservers.Find(&observer));
+    if (KErrNotFound != offset) {
+        mObservers.Remove(offset);
+    }
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::RunL()
+{
+    User::LeaveIfError(iStatus.Int());
+    ProvideEventL();
+    Subscribe();
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::DoCancel()
+{
+    if (IsActive()) {
+        mResources.WsSession().EventReadyCancel();
+    }
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+TInt CTsWindowGroupsMonitor::RunError(TInt error)
+{
+    if (!IsActive() && KErrCancel != error) {
+        Subscribe();
+    }
+    return KErrNone;
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::Subscribe()
+{
+    mResources.WsSession().EventReady( &iStatus );
+    SetActive();
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::ProvideEventL()
+{
+    TWsEvent wsEvent;
+    mResources.WsSession().GetEvent(wsEvent);
+    for (TInt iter(0); iter < mObservers.Count(); ++iter) {
+        ProvideEventL(wsEvent, *mObservers[iter]);
+    }
+}
+
+// -----------------------------------------------------------------------------
+//
+// -----------------------------------------------------------------------------
+//
+void CTsWindowGroupsMonitor::ProvideEventL(TWsEvent event, 
+                                          MTsWindowGroupsObserver &observer)
+{
+    RArray<RWsSession::TWindowGroupChainInfo> wgInfo;
+    CleanupClosePushL(wgInfo);
+    switch(event.Type()) {
+    case EEventWindowGroupListChanged:
+        User::LeaveIfError(mResources.WsSession().WindowGroupList(0, &wgInfo));
+        observer.HandleWindowGroupChanged(mResources, wgInfo.Array());
+        break;
+    }
+    CleanupStack::PopAndDestroy(&wgInfo);
+}