textinput/peninputarc/src/peninputanim/penpointereventsuppressor.cpp
changeset 0 eb1f2e154e89
child 22 bd83ceabce89
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/textinput/peninputarc/src/peninputanim/penpointereventsuppressor.cpp	Tue Feb 02 01:02:04 2010 +0200
@@ -0,0 +1,120 @@
+/*
+* 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 <penpointereventsuppressor.h>
+
+const TInt KPenPointerEventSuppressorDefaultMaxTapDuration = 400000;	// 0.4 seconds
+const TInt KPenPointerEventSuppressorDefaultMinInterDragInterval = 0;
+const TInt KPenPointerEventSuppressorDefaultMovement = 6;
+
+CPenPointerEventSuppressor* CPenPointerEventSuppressor::NewL()
+	{
+	return new (ELeave) CPenPointerEventSuppressor;
+	}
+
+CPenPointerEventSuppressor::~CPenPointerEventSuppressor()
+	{
+	
+	}
+
+CPenPointerEventSuppressor::CPenPointerEventSuppressor()
+: iMaxTapDuration(KPenPointerEventSuppressorDefaultMaxTapDuration),
+  iMinInterDragInterval(KPenPointerEventSuppressorDefaultMinInterDragInterval),
+  iTap(EFalse)
+  	{
+  	// default move limit is 6 units, which seems to be a forgiving value for finger touch
+  	iMaxTapMove.iWidth = KPenPointerEventSuppressorDefaultMovement;
+	iMaxTapMove.iHeight = KPenPointerEventSuppressorDefaultMovement;
+  	}
+
+TBool CPenPointerEventSuppressor::SuppressPointerEvent(
+        const TPointerEvent& aPointerEvent)
+	{
+	switch ( aPointerEvent.iType )
+		{
+		case TPointerEvent::EButton1Down:
+		    {
+			iDownTime.HomeTime();
+			iTap = ETrue;
+			iDownPos = aPointerEvent.iPosition;
+			iLastEventTime = iDownTime;
+			break;
+		    }		
+		case TPointerEvent::EDrag:
+			{
+			TTime now;
+			now.HomeTime();
+			if (iTap)
+				{
+				TPoint delta = aPointerEvent.iPosition - iDownPos;
+				if (Abs(delta.iX) > iMaxTapMove.iWidth ||
+					Abs(delta.iY) > iMaxTapMove.iHeight ||
+					now.MicroSecondsFrom(iDownTime) >= iMaxTapDuration)
+					{
+					// This touch action has gone outside the parameters of a tap
+					// the drag event should be handled
+					iTap = EFalse;
+					iLastEventTime = now;
+					return EFalse;
+					}
+				else
+					{
+					// still a tap, so suppress the drag event
+					return ETrue;
+					}
+				}
+			else if (now.MicroSecondsFrom(iLastEventTime) < iMinInterDragInterval)
+				{
+				// too soon since the last drag, suppress it
+				return ETrue;
+				}
+
+			// this drag event should be handled
+			iLastEventTime = now;
+			break;
+			}
+		case TPointerEvent::EButton1Up:
+		    {
+			iTap = EFalse;
+			break;
+		    }
+		case TPointerEvent::ENullType:
+		    break;
+		default:
+			break;
+		}
+	
+	// all non-drag events should be handled
+	return EFalse;
+	}
+
+void CPenPointerEventSuppressor::SetMaxTapDuration(
+        TTimeIntervalMicroSeconds aDuration)
+	{
+	iMaxTapDuration = aDuration;
+	}
+
+void CPenPointerEventSuppressor::SetMaxTapMove(TSize aMoveLimits)
+	{
+	iMaxTapMove = aMoveLimits;
+	}
+	
+void CPenPointerEventSuppressor::SetMinInterDragInterval(
+        TTimeIntervalMicroSeconds aInterval)
+	{
+	iMinInterDragInterval = aInterval;
+	}