--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/akntouchgesturefw/src/akntouchgesturefwdragtracer.cpp	Tue Feb 02 01:00:49 2010 +0200
@@ -0,0 +1,225 @@
+/*
+* 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 "akntouchgesturefwdragtracer.h"
+
+using namespace AknTouchGestureFw;
+
+
+// ---------------------------------------------------------------------------
+// Two-phased constructor.
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragTracer* CAknTouchGestureFwDragTracer::NewL()
+    {
+    CAknTouchGestureFwDragTracer* self =
+        CAknTouchGestureFwDragTracer::NewLC();
+    CleanupStack::Pop( self );
+    return self;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Two-phased constructor.
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragTracer* CAknTouchGestureFwDragTracer::NewLC()
+    {
+    CAknTouchGestureFwDragTracer* self
+        = new ( ELeave ) CAknTouchGestureFwDragTracer();
+    CleanupStack::PushL( self );
+    return self;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Destructor
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragTracer::~CAknTouchGestureFwDragTracer()
+    {
+    }
+
+
+// ---------------------------------------------------------------------------
+// Initializes the drag tracer state.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragTracer::Initialize( const TPoint& aStartPosition )
+    {
+    iHorizDirection = EDirectionNone;
+    iVertDirection = EDirectionNone;
+
+    iHorizCounter = 0;
+    iVertCounter = 0;
+    iPosition = aStartPosition;
+    }
+
+
+
+// ---------------------------------------------------------------------------
+// Checks if the drag direction has been changed.
+// ---------------------------------------------------------------------------
+//
+TBool CAknTouchGestureFwDragTracer::IsDirectionChanged(
+    const TPoint& aPosition,
+    TInt aSensitivity )
+    {
+    if ( aPosition == iPosition )
+        {
+        // Can't calculate direction.
+        return EFalse;
+        }
+
+    TBool directionChanged( EFalse );
+
+    // Horizontal direction
+
+    if ( iHorizDirection == EDirectionNone )
+        {
+        // Calculate first horizontal direction based on current and
+        // previous point.
+        if ( aPosition.iX > iPosition.iX )
+            {
+            iHorizDirection = EDirectionForward;
+            }
+        else if ( aPosition.iX < iPosition.iX )
+            {
+            iHorizDirection = EDirectionBackward;
+            }
+        }
+    else
+        {
+        // Horizontal direction changes only if certain amount of new points
+        // is to reversed direction.
+
+        // Note: direction counter is updated with the following calls.
+        if ( IsDirectionChanged(
+                aPosition.iX,
+                iPosition.iX,
+                iHorizDirection,
+                iHorizCounter,
+                aSensitivity ) )
+            {
+            directionChanged = ETrue;
+            }
+        }
+
+    // Vertical direction
+
+    if ( iVertDirection == EDirectionNone )
+        {
+        // Calculate first vertical direction based on current and
+        // previous point.
+        if ( aPosition.iY > iPosition.iY )
+            {
+            iVertDirection = EDirectionForward;
+            }
+        else if ( aPosition.iY < iPosition.iY )
+            {
+            iVertDirection = EDirectionBackward;
+            }
+        }
+    else
+        {
+        // Vertical direction changes only if certain amount of new points
+        // is to reversed direction.
+
+        // Note: direction counter is updated with the following call.
+        if ( IsDirectionChanged(
+                aPosition.iY,
+                iPosition.iY,
+                iVertDirection,
+                iVertCounter,
+                aSensitivity ) )
+            {
+            directionChanged = ETrue;
+            }
+        }
+
+    iPosition = aPosition;
+    return directionChanged;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Checks if the drag direction has been changed.
+// ---------------------------------------------------------------------------
+//
+TBool CAknTouchGestureFwDragTracer::IsDirectionChanged(
+    TInt aCurrentCoordinate,
+    TInt aPrevCoordinate,
+    TDirection& aDirection,
+    TInt& aCounter,
+    TInt aSensitivity )
+    {
+    TBool directionChanged( EFalse );
+
+    if ( aDirection == EDirectionForward )
+        {
+        if ( aCurrentCoordinate < aPrevCoordinate )
+            {
+            aCounter++;
+            }
+        else
+            {
+            aCounter = 0;
+            }
+
+        if ( aCounter == aSensitivity )
+            {
+            directionChanged = ETrue;
+            aDirection = EDirectionBackward;
+            aCounter = 0;
+            }
+        }
+    else if ( aDirection == EDirectionBackward )
+        {
+        if ( aCurrentCoordinate > aPrevCoordinate )
+            {
+            aCounter++;
+            }
+        else
+            {
+            aCounter = 0;
+            }
+
+        if ( aCounter == aSensitivity )
+            {
+            directionChanged = ETrue;
+            aDirection = EDirectionForward;
+            aCounter = 0;
+            }
+        }
+    return directionChanged;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Default C++ constructor.
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragTracer::CAknTouchGestureFwDragTracer():
+    iHorizDirection( EDirectionNone ),
+    iVertDirection( EDirectionNone ),
+    iHorizCounter( 0 ),
+    iVertCounter( 0 ),
+    iPosition( 0, 0 )
+    {
+    }
+
+// End of File