--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbuis/usbui/USBClassChangeUIPlugin/src/USBDeviceStateWatcher.cpp	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,131 @@
+/*
+* Copyright (c) 2007 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:  Device state watcher class.
+ *
+*/
+
+
+// INCLUDE FILES
+#include "USBDeviceStateWatcher.h"
+
+// CONSTANTS
+const TUint KUsbAllStates = 0xFFFFFFFF;
+
+// --------------------------------------------------------------------------
+// Two-phased constructor. Uses existing usb manager session.
+// --------------------------------------------------------------------------
+CUSBDeviceStateWatcher*
+CUSBDeviceStateWatcher::NewL(MUSBDeviceStateObserver& aObserver, RUsb& aUsbMan)
+    {
+    CUSBDeviceStateWatcher* self = new(ELeave)CUSBDeviceStateWatcher(aObserver);
+    CleanupStack::PushL(self);
+    self->ConstructL(aUsbMan);
+    CleanupStack::Pop(self);
+    return self;
+    }
+
+// --------------------------------------------------------------------------
+// Two-phased constructor. Creates its own usb manager session.
+// --------------------------------------------------------------------------
+CUSBDeviceStateWatcher*
+CUSBDeviceStateWatcher::NewL(MUSBDeviceStateObserver& aObserver)
+    {
+    CUSBDeviceStateWatcher* self = new(ELeave)CUSBDeviceStateWatcher(aObserver);
+    CleanupStack::PushL(self);
+    self->ConstructL();
+    CleanupStack::Pop(self);
+    return self;
+    }
+
+// --------------------------------------------------------------------------
+// C++ constructor
+// --------------------------------------------------------------------------
+CUSBDeviceStateWatcher::CUSBDeviceStateWatcher(MUSBDeviceStateObserver& aObserver) 
+    : CActive(EPriorityStandard), iObserver(aObserver)
+    {
+    CActiveScheduler::Add(this);
+    }
+
+// --------------------------------------------------------------------------
+// C++ destructor
+// --------------------------------------------------------------------------
+CUSBDeviceStateWatcher::~CUSBDeviceStateWatcher()
+    {
+    Cancel();
+    }
+
+// --------------------------------------------------------------------------
+// Symbian 2nd phase constructor. Uses existing usb manager session. 
+// --------------------------------------------------------------------------
+void CUSBDeviceStateWatcher::ConstructL(RUsb& aUsbMan)
+    {
+    iUsbMan.SetHandleNC(aUsbMan.Handle()); // NC == NoClose
+    CommonConstructL();
+    }
+
+// --------------------------------------------------------------------------
+// Symbian 2nd phase constructor. Creates its own usb manager session. 
+// --------------------------------------------------------------------------
+void CUSBDeviceStateWatcher::ConstructL()
+    {
+    User::LeaveIfError(iUsbMan.Connect());
+    CommonConstructL();
+    }
+
+// --------------------------------------------------------------------------
+// Code shared by all ConstructL methods.
+// Usb manager session has already been set up.
+// --------------------------------------------------------------------------
+void CUSBDeviceStateWatcher::CommonConstructL()
+    {
+    User::LeaveIfError(iUsbMan.GetDeviceState(iCurrentState));
+    iPreviousState = iCurrentState;
+    iUsbMan.DeviceStateNotification(KUsbAllStates, iCurrentState, iStatus);
+    SetActive();
+    }
+
+// --------------------------------------------------------------------------
+// The device state has changed.
+// --------------------------------------------------------------------------
+void CUSBDeviceStateWatcher::RunL()
+    {
+    if (iStatus == KErrNone)
+        {
+            if (iCurrentState != iPreviousState)
+                {
+                    iObserver.DeviceStateChanged(iPreviousState, iCurrentState);
+                    iPreviousState = iCurrentState;
+                }
+            iUsbMan.DeviceStateNotification(KUsbAllStates, iCurrentState, iStatus);
+            SetActive();
+        }
+    }
+ 
+// ----------------------------------------------------------------------------
+// Standard active object error function.
+// ----------------------------------------------------------------------------
+TInt CUSBDeviceStateWatcher::RunError(TInt /*aError*/)
+    {
+    // Currently no leaving functions called in RunL, thus nothing should cause
+    // this to be called -> return.
+    return KErrNone;
+    }
+
+// ----------------------------------------------------------------------------
+// Standard active object cancellation function.
+// ----------------------------------------------------------------------------
+void CUSBDeviceStateWatcher::DoCancel()
+    {
+    iUsbMan.DeviceStateNotificationCancel();    
+    }