uiaccelerator_plat/alf_visual_api/inc/alf/alfeventhandler.h
changeset 0 15bf7259bb7c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uiaccelerator_plat/alf_visual_api/inc/alf/alfeventhandler.h	Tue Feb 02 07:56:43 2010 +0200
@@ -0,0 +1,58 @@
+/*
+* 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:   Event handler API
+*
+*/
+
+
+ 
+#ifndef ALFEVENTHANDLER_H
+#define ALFEVENTHANDLER_H
+
+#include <e32base.h>
+
+class TAlfEvent;
+
+/**
+ * MAlfEventHandler is an interface that can be derived by any object that want's to handle
+ * Alfred UI Toolkit events scheduled by AlfCommandScheduler.
+ * 
+ * If an object wishes to process events from the toolkit, it should implement this interface. 
+ * 
+ * @note   The destructor will NOT cancel any pending commands enqueued to this object,
+ *         so you must call eg. <code>CAlfEnv::CancelCommands(this);</code> to cancel
+ *         still pending commands to prevent calling destroyed object.
+ */
+class MAlfEventHandler
+    {
+public:
+
+    /**
+     * Called when an input event is being offered to this object.
+     * 
+     * The implementation must ensure that the function returns EFalse if 
+     * it does not do anything in response to the event, otherwise, other objects
+     * may be prevented from receiving the event. If it is able to process the 
+     * event it should return ETrue.
+     *
+     * @param aEvent  Event to be handled.
+     *
+     * @return  <code>ETrue</code>, if the event was handled.
+     *          Otherwise <code>EFalse</code>.
+     */
+    virtual TBool OfferEventL(const TAlfEvent& aEvent) = 0;
+
+    };  
+
+#endif  // ALFEVENTHANDLER_H