--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/akntouchgesturefw/src/akntouchgesturefwdragrecognizer.cpp	Wed Sep 01 12:16:19 2010 +0100
@@ -0,0 +1,299 @@
+/*
+* 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:  Drag touch gesture recognizer.
+*
+*/
+
+#include "akntouchgesturefwdefs.h"
+#include "akntouchgesturefwevent.h"
+#include "akntouchgesturefwdragrecognizer.h"
+#include "akntouchgesturefwsettings.h"
+
+using namespace AknTouchGestureFw;
+
+// ======== MEMBER FUNCTIONS ========
+
+// ---------------------------------------------------------------------------
+// Two-phased constructor.
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragRecognizer* CAknTouchGestureFwDragRecognizer::NewL(
+        CAknTouchGestureFwRecognitionEngine& aEngine )
+    {
+    CAknTouchGestureFwDragRecognizer* self =
+        CAknTouchGestureFwDragRecognizer::NewLC( aEngine );
+    CleanupStack::Pop( self );
+    return self;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Two-phased constructor.
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragRecognizer* CAknTouchGestureFwDragRecognizer::NewLC(
+        CAknTouchGestureFwRecognitionEngine& aEngine )
+    {
+    CAknTouchGestureFwDragRecognizer* self
+        = new ( ELeave ) CAknTouchGestureFwDragRecognizer( aEngine );
+    CleanupStack::PushL( self );
+    return self;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Destructor
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragRecognizer::~CAknTouchGestureFwDragRecognizer()
+    {
+    }
+
+
+// ---------------------------------------------------------------------------
+// Returns the drag gesture group.
+// ---------------------------------------------------------------------------
+//
+TAknTouchGestureFwGroup CAknTouchGestureFwDragRecognizer::GestureGroup() const
+    {
+    return EAknTouchGestureFwGroupDrag;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Cancels the drag gesture recognition.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::CancelRecognizing()
+    {
+    if ( iContinuousFeedback )
+        {
+        StopContinuousFeedback();
+        iContinuousFeedback = EFalse;
+        }
+    if ( iDragDetected )
+        {
+        // We ignore the possible leave in order to ensure that the
+        // state gets reset.
+        TRAP_IGNORE( SendDragEventL( EAknTouchGestureFwStop ) );
+        }
+    Reset();
+    }
+
+
+// ---------------------------------------------------------------------------
+// Handles single-touch pointer events.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::HandleSinglePointerEventL(
+        const TPointerEventData& aPointerData )
+    {
+    switch ( aPointerData.iPointerEvent.iType )
+        {
+        case TPointerEvent::EButton1Down:
+            {
+            StartSingleRecognizing( aPointerData.iPointerEvent.iPosition );
+            break;
+            }
+        case TPointerEvent::EDrag:
+            {
+            if ( iStartOnSingleTouchDrag )
+                {
+                // Start clears iStartOnSingleTouchDrag 
+                StartSingleRecognizing( aPointerData.iPointerEvent.iPosition );
+                }
+            else
+                {
+                SingleRecognizeL( aPointerData.iPointerEvent.iPosition );
+                }
+            break;
+            }
+        case TPointerEvent::EButton1Up:
+            {
+            CompleteSingleRecognizingL();
+            break;
+            }
+        default:
+            {
+            break;
+            }
+        }
+    }
+
+
+// ---------------------------------------------------------------------------
+// Handles multi-touch pointer events.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::HandleMultiPointerEventL(
+    const TPointerEventData& aPointerData,
+    const TPoint& /*aFirstPointerPosition*/,
+    const TPoint& /*aSecondPointerPosition*/ )
+    {
+    switch ( aPointerData.iPointerEvent.iType )
+        {
+        case TPointerEvent::EButton1Down:
+            {
+            // Multi touch begin completes single recognizing
+            CompleteSingleRecognizingL();
+            break;
+            }
+        case TPointerEvent::EDrag:
+            {
+            break;
+            }
+        case TPointerEvent::EButton1Up:
+            {
+            // Upon next single touch drag, start recognition.
+            // Current position is not necessarily accurate.
+            iStartOnSingleTouchDrag = ETrue;
+            break;
+            }
+        default:
+            {
+            break;
+            }
+        }
+    }
+
+
+// ---------------------------------------------------------------------------
+// C++ constructor.
+// ---------------------------------------------------------------------------
+//
+CAknTouchGestureFwDragRecognizer::CAknTouchGestureFwDragRecognizer(
+        CAknTouchGestureFwRecognitionEngine& aEngine )
+    : CAknTouchGestureFwBaseRecognizer( aEngine ),
+      iStartPosition( 0, 0 ),
+      iCurrentPosition( 0, 0 ),
+      iPreviousPosition( 0, 0 ),
+      iDragDetected( EFalse ),
+      iDragArea()
+    {
+    Reset();
+    }
+
+
+// ---------------------------------------------------------------------------
+// Starts recognizing the drag gesture.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::StartSingleRecognizing(
+    const TPoint& aPointerPos )
+    {
+    iDragDetected = EFalse;
+    iDragArea.Start( aPointerPos );
+    iStartPosition = aPointerPos;
+    iCurrentPosition = aPointerPos;
+    iPreviousPosition.SetXY( 0, 0 );
+    iStartOnSingleTouchDrag = EFalse;
+    }
+
+
+// ---------------------------------------------------------------------------
+// Continues recognizing the drag gesture, called on drag pointer events.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::SingleRecognizeL(
+    const TPoint& aPointerPos )
+    {
+    iPreviousPosition = iCurrentPosition;
+    iCurrentPosition = aPointerPos;
+
+    if ( !iDragDetected )
+        {
+        // Check if points form a drag.
+        iDragDetected = iDragArea.Check( aPointerPos, DragThreshold() );
+        if ( iDragDetected )
+            {
+            SendDragEventL( EAknTouchGestureFwStart );
+            }
+        }
+    else // iDragDetected holds
+        {
+        // Send update event if position changed.
+        if ( iPreviousPosition != iCurrentPosition )
+            {
+            SendDragEventL( EAknTouchGestureFwOn );
+            }
+        }
+    }
+
+
+// ---------------------------------------------------------------------------
+// Ends the drag gesture recognition.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::CompleteSingleRecognizingL()
+    {
+    if ( iContinuousFeedback )
+        {
+        StopContinuousFeedback();
+        iContinuousFeedback = EFalse;
+        }
+    
+    // Send drag stopped event only if drag was detected.
+    if ( iDragDetected )
+        {
+        iDragDetected = EFalse;
+        SendDragEventL( EAknTouchGestureFwStop );
+        }
+    }
+
+
+// ---------------------------------------------------------------------------
+// Send a drag gesture event to the observer.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::SendDragEventL(
+        TAknTouchGestureFwState aGestureState )
+    {
+    if ( aGestureState != EAknTouchGestureFwStop )
+        {
+        TTouchFeedbackType feedbackType(
+            FeedbackType( EAknTouchGestureFwDrag ) );       
+    
+        if ( feedbackType & ETouchFeedbackVibra )
+            {
+            StartContinuousFeedback( ETouchContinuousSmooth,
+                    KAknTouchGestureFwFeedbackIntensity,
+                    KAknTouchGestureFwDragFeedbackTimeout );
+            iContinuousFeedback = ETrue;
+            }
+        }
+    
+    TAknTouchGestureFwDragEvent drag;
+    drag.SetState( aGestureState );
+    drag.SetStartPosition( iStartPosition );
+    drag.SetCurrentPosition( iCurrentPosition );
+    drag.SetPreviousPosition( iPreviousPosition );
+    SendGestureEventL( drag );
+    }
+
+
+// ---------------------------------------------------------------------------
+// Resets recognizer's state.
+// ---------------------------------------------------------------------------
+//
+void CAknTouchGestureFwDragRecognizer::Reset()
+    {
+    iStartPosition.SetXY( 0, 0 );
+    iCurrentPosition.SetXY( 0, 0 );
+    iPreviousPosition.SetXY( 0, 0 );
+    iDragDetected = EFalse;
+    iDragArea.Reset();
+    iStartOnSingleTouchDrag = EFalse;
+    }
+
+// End of File