idlehomescreen/xmluirendering/uiengine/inc/xngesturedefs.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 15 Mar 2010 12:39:47 +0200
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Gesture helper constant definitions
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*
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*/
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#ifndef _XNGESTUREDEFS_H_
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#define _XNGESTUREDEFS_H_
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// System includes
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#include <e32std.h>
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/** 
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 * This flag controls whether helpers emits a double tap or a tap gesture 
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 * for a second tap 
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 */
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#define _GESTURE_DOUBLE_TAP_SUPPORT
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/**
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 * XnGestureHelper namespace
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 * Used for the whole gesture family - Gesture recognizer, gesture helper, 
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 * Point array
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 */
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namespace XnGestureHelper
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    {
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    /** time to hold the stylus in the same position to activate 
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     * holding, in microseconds 
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     */
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    const TInt KHoldDuration = 500000; 
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    /** 
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     * time to tap again for the second tap to be a double tap, in 
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     * microseconds 
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     */
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    const TInt KMaxDoubleTapDuration = 400000; 
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    /** 
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     * time in which speed becomes zero if user stops stylus movement before
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     * lifting the pointer, in microseconds
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     */ 
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    const TInt KSpeedStopTime = 100000; 
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    /** 
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     * tolerance in degrees to either side of an angle, for direction to be 
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     * the same as reference angle
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     */
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    const TReal KAngleTolerance = 35;
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    /**  
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     * maximum pointer movement from pointer down position for a gesture be 
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     * a tap or hold gesture
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     */
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    const TInt KSamePointTolerance = 3;
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    /** 
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     * minimum length of a valid swipe in pixels. should be larger than 
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     * KTapTolerance
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     */
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    const TReal KMinSwipeLength = 100;
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    /** Nth pointer event before the latest point */
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    const TInt KPreviousPointOffset = 3;
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    /** 
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     * Panic codes 
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     */
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    enum TGesturePanic
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        {
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        EGesturePanicIllegalLogic
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        };
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    /** 
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     * Panics the thread 
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     * 
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     * @param aReason Panic reason
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     */
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    inline void Panic( TGesturePanic aReason )
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        {
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        _LIT( KComponentName, "XnGestureHelper" );
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        User::Panic( KComponentName, aReason );
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        }   
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    } // namespace XnGestureHelper
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#endif // _XNGESTUREDEFS_H_