idlehomescreen/xmluirendering/uiengine/src/xngesturehelper.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:40:49 +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 implementation
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*
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*/
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// System includes
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#include <e32base.h>
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#include <w32std.h>
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// User includes
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#include "xngesturehelper.h"
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#include "xngesture.h"
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#include "xngesturedefs.h"
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#include "xnnode.h"
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using namespace XnGestureHelper;
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namespace XnGestureHelper
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    {
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    NONSHARABLE_CLASS( CHoldingTimer ) : public CTimer
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        {
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    public:
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        /** Two-phase constructor */
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        static CHoldingTimer* NewL( CXnGestureHelper& aHelper )
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            {
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            CHoldingTimer* self = new ( ELeave ) CHoldingTimer( aHelper );
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            CleanupStack::PushL( self );
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            self->ConstructL();
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            // "hold event" sending is enabled by default
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            self->iIsEnabled = ETrue;
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            CActiveScheduler::Add( self );
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            CleanupStack::Pop( self );
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            return self;
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            }
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        /** Destructor */
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        ~CHoldingTimer()
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            {
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            Cancel();
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            }
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        /** Set whether sending holding events is currently enabled */
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        void SetEnabled( TBool aEnabled )
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            {
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            iIsEnabled = aEnabled;
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            // cancel in case hold timer is already running
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            Cancel();
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            }
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        /** @return whether sending holding events is currently enabled */
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        TBool IsEnabled() const
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            {
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            return iIsEnabled;
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            }
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        /** Start the timer. Calls CXnGestureHelper::StartHoldingL upon
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          * completion */
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        void Start()
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            {
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            // if sending hold events is disabled, do not ever start the hold
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            // timer, and hence hold events will never be triggered
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            if ( iIsEnabled )
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                {
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                Cancel();
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                After( KHoldDuration );
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                }
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            }
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    private:
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        /** Constructor */
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        CHoldingTimer( CXnGestureHelper& aHelper )
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            : // give higher priority to new pointer events with - 1
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              CTimer( EPriorityUserInput - 1 ),
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              iHelper( aHelper )
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            {
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            }
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        void RunL() // From CActive
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            {
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            iHelper.StartHoldingL();
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            }
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    private:
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        /// helper object that will be called back when timer is triggered
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        CXnGestureHelper& iHelper;
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        /// whether sending holding events is currently enabled
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        TBool iIsEnabled;
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        };
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    } // namespace GestureHelper
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/**
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* @return position from event. Use this instead of using aEvent direction to
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*         avoid accidentally using TPointerEvent::iPosition
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*/
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inline TPoint Position( const TPointerEvent& aEvent )
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    {
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    // use parent position, since the capturer is using full screen area,
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    // and because the (Alfred) drag events are not local to visual even when
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    // coming from the client
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    return aEvent.iParentPosition;
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    }
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// ----------------------------------------------------------------------------
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// Two-phase constructor
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// ----------------------------------------------------------------------------
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//
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CXnGestureHelper* CXnGestureHelper::NewL( CXnNode& aNode )
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    {
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    CXnGestureHelper* self = new ( ELeave ) CXnGestureHelper( aNode );
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    CleanupStack::PushL( self );
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    self->iHoldingTimer = CHoldingTimer::NewL( *self );
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    self->iGesture = new ( ELeave ) CXnGesture();
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    CleanupStack::Pop( self );
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    return self;
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    }
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// ----------------------------------------------------------------------------
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// Constructor
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// ----------------------------------------------------------------------------
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//
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CXnGestureHelper::CXnGestureHelper( CXnNode& aNode )
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    : iOwner( aNode )
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    {
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    }
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// ----------------------------------------------------------------------------
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// Destructor
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// ----------------------------------------------------------------------------
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//
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CXnGestureHelper::~CXnGestureHelper()
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    {
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    delete iHoldingTimer;
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    delete iGesture;
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    }
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// ----------------------------------------------------------------------------
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// SetHoldingEnabled
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// ----------------------------------------------------------------------------
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//
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void CXnGestureHelper::SetHoldingEnabled( TBool aEnabled )
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    {
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    iHoldingTimer->SetEnabled( aEnabled );
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    }
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// ----------------------------------------------------------------------------
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// IsHoldingEnabled
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// ----------------------------------------------------------------------------
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//
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TBool CXnGestureHelper::IsHoldingEnabled() const
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    {
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    return iHoldingTimer->IsEnabled();
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    }
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// ----------------------------------------------------------------------------
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// Reset state
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// ----------------------------------------------------------------------------
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//
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void CXnGestureHelper::Reset()
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    {
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    iHoldingTimer->Cancel();
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    iGesture->Reset();
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    }
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/**
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* Helper function that calls Reset on the pointer to CXnGestureHelper
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*/
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static void ResetHelper( TAny* aHelper )
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    {
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    static_cast< CXnGestureHelper* >( aHelper )->Reset();
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    }
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// ----------------------------------------------------------------------------
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// Sets gesture destination
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// ----------------------------------------------------------------------------
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//
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void CXnGestureHelper::SetDestination( CXnNode* aDestination )
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    {
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    iDestination = aDestination;
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    }
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// ----------------------------------------------------------------------------
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// Gets gesture destination
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// ----------------------------------------------------------------------------
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//    
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CXnNode* CXnGestureHelper::Destination() const
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    {
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    return iDestination;
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    }
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// ----------------------------------------------------------------------------
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// Gets gesture owner
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// ----------------------------------------------------------------------------
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//    
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CXnNode* CXnGestureHelper::Owner() const
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    {
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    return &iOwner;
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    }
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// ----------------------------------------------------------------------------
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// Handle a pointer event
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// ----------------------------------------------------------------------------
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//
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TSwipeResult CXnGestureHelper::HandlePointerEventL( const TPointerEvent& aEvent )
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    {
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    TSwipeResult ret = ESwipeNone;
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    switch ( aEvent.iType )
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        {
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        case TPointerEvent::EButton1Down:
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            // If no up event was received during previous gesture, cancel
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            // previous event and reset state
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            if ( !IsIdle() )
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                {
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                iGesture->SetCancelled();
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                // ambiguous what is the right thing when "cancel" event leaves
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                // and "start" does not. Leaving for cancel *after* "start" could
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                // be unexpected to client, as client would have handled start
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                // event successfully. Assume that leaving upon cancellation
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                // can be ignored.
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                Reset();
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                }
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            // adding the first point implicitly makes the state "not idle"
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            AddPointL( aEvent );
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   235
            // If AddPointL leaves, IsIdle will return EFalse for other events
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   236
            // types, hence further pointer events will be ignored.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   237
            // Therefore, holding will NOT be started if AddPointL leaves,
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   238
            // since the callback would trigger a gesture callback, and that
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   239
            // would access an empty points array.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   240
            iHoldingTimer->Start();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   241
            break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   242
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   243
        case TPointerEvent::EDrag:
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   244
            // ignore the event in case not in "recording" state. this may
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   245
            // happen if holding was triggered, or client sends up event after
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   246
            // down event was received in a different *client* state, and
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   247
            // client did not forward the down event to here.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   248
            // Also, while stylus down, the same event is received repeatedly
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   249
            // even if stylus does not move. Filter out by checking if point
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   250
            // is the same as the latest point
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   251
            if ( !IsIdle() && !iGesture->IsLatestPoint( Position( aEvent ) ) )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   252
                {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   253
                AddPointL( aEvent );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   254
                if ( !( iGesture->IsHolding() ||
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   255
                        iGesture->IsNearHoldingPoint( Position( aEvent ) ) ) )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   256
                    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   257
                    // restart hold timer, since pointer has moved
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   258
                    iHoldingTimer->Start();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   259
                    // Remember the point in which holding was started
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   260
                    iGesture->SetHoldingPoint();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   261
                    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   262
                }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   263
            break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   264
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   265
        case TPointerEvent::EButton1Up:
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   266
            // ignore up event if no down event received
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   267
            if ( !IsIdle() )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   268
                {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   269
                // reset in case the down event is not received for a reason
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   270
                // in client, and instead drag or up events are received.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   271
                // reset via cleanup stack to ensure Reset is run even if
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   272
                // observer leaves
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   273
                CleanupStack::PushL( TCleanupItem( &ResetHelper, this ) );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   274
                iGesture->SetComplete();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   275
                // if adding of the point fails, notify client with a
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   276
                // cancelled event. It would be wrong to send another
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   277
                // gesture code when the up point is not known
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   278
                if ( AddPoint( aEvent ) != KErrNone )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   279
                    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   280
                    iGesture->SetCancelled();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   281
                    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   282
                else
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   283
                    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   284
                    // send gesture code if holding has not been started
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   285
                    if ( !iGesture->IsHolding() )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   286
                        {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   287
                        // if client leaves, the state is automatically reset.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   288
                        // In this case the client will not get the released event
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   289
                        ret = ValidSwipe();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   290
                        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   291
                    // send an event that stylus was lifted
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   292
                    iGesture->SetReleased();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   293
                    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   294
                // reset state
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   295
                CleanupStack::PopAndDestroy( this );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   296
                }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   297
            break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   298
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   299
        default:
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   300
            break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   301
        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   302
    return ret;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   303
    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   304
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   305
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   306
// Is the helper idle?
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   307
// inline ok in cpp file for a private member function
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   308
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   309
//
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   310
inline TBool CXnGestureHelper::IsIdle() const
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   311
    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   312
    return iGesture->IsEmpty();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   313
    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   314
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   315
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   316
// Add a point to the sequence of points that together make up the gesture
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   317
// inline ok in cpp file for a private member function
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   318
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   319
//
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   320
inline void CXnGestureHelper::AddPointL( const TPointerEvent& aEvent )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   321
    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   322
    User::LeaveIfError( AddPoint( aEvent ) );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   323
    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   324
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   325
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   326
// Add a point to the sequence of points that together make up the gesture
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   327
// inline ok in cpp file for a private member function
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   328
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   329
//
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   330
inline TInt CXnGestureHelper::AddPoint( const TPointerEvent& aEvent )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   331
    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   332
    return iGesture->AddPoint( Position ( aEvent ) );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   333
    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   334
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   335
/**
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   336
* Helper function that calls ContinueHolding on the pointer to TGesture
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   337
*/
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   338
static void ContinueHolding( TAny* aGesture )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   339
    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   340
    static_cast< CXnGesture* >( aGesture )->ContinueHolding();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   341
    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   342
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   343
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   344
// Add a point to the sequence of points that together make up the gesture
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   345
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   346
//
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   347
void CXnGestureHelper::StartHoldingL()
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   348
    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   349
    // hold & tap event is specifically filtered out. Use case: in list fast
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   350
    // scrolling activation (e.g. enhanced coverflow), tap & hold should not
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   351
    // start fast scroll. In addition, after long tap on start position,
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   352
    // drag and drag & hold swiping should emit normal swipe and swipe&hold
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   353
    // events. Therefore, tap & hold is not supported.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   354
    if ( !iGesture->IsTap() )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   355
        {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   356
        // holding has just started, and gesture code should be provided to client.
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   357
        // set gesture state so that it produces a gesture code (other than drag)
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   358
        iGesture->StartHolding();
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   359
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   360
        // create an item in the cleanup stack that will set the gesture state
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   361
        // to holding-was-started-earlier state. NotifyL may leave, but the
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   362
        // holding-was-started-earlier state must still be successfully set,
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   363
        // otherwise, the holding gesture code will be sent twice
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   364
        CleanupStack::PushL( TCleanupItem( &ContinueHolding, iGesture ) );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   365
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   366
        // set holding state to "post holding"
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   367
        CleanupStack::PopAndDestroy( iGesture );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   368
        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   369
    }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   370
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   371
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   372
// Check if swipe is valid
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   373
// ----------------------------------------------------------------------------
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   374
//
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   375
TSwipeResult CXnGestureHelper::ValidSwipe()
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   376
    {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   377
    TSwipeResult ret = ESwipeNone;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   378
    TBool validSwipe(ETrue);
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   379
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   380
    // check if swipe is between defined values
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   381
    TInt distanceX = Abs( iGesture->Distance().iX );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   382
    TInt speedX = Abs( static_cast< TInt >( iGesture->Speed().iX ) );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   383
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   384
    TInt minLength( iOwner.MarginRect().Width() / 2 );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   385
    
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   386
    TInt dy( Abs( iGesture->StartPos().iY - iGesture->CurrentPos().iY ) );
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   387
    
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   388
    if ( distanceX < minLength )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   389
        {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   390
        validSwipe = EFalse;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   391
        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   392
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   393
    if ( speedX < KGestureMinSpeedX )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   394
        {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   395
        validSwipe = EFalse;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   396
        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   397
               
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   398
    if ( dy > KGestureMaxDeltaY )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   399
        {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   400
        validSwipe = EFalse;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   401
        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   402
    
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   403
    // check the direction of swipe
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   404
    if ( validSwipe )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   405
        {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   406
        switch ( iGesture->Code( CXnGesture::EAxisHorizontal ) )
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   407
            {
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   408
             case EGestureSwipeLeft:
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   409
                ret = ESwipeLeft;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   410
                break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   411
             case EGestureSwipeRight:
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   412
                 ret = ESwipeRight;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   413
                break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   414
             default: // fall through
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   415
                break;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   416
            }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   417
        }
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   418
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   419
    return ret;
f72a12da539e Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   420
    }