/*

* 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:  MR listpane physics impl

*

*/

#include "cmrlistpanephysics.h"

#include "cmrlistpane.h"

#include "nmrlayoutmanager.h"

#include "cmrfieldcontainer.h"

#include <aknphysics.h>

//DEBUG

#include "emailtrace.h"

namespace { // codescanner::namespace

const TInt KCustomDragTreshold( 10 );

} // namespace

// ---------------------------------------------------------------------------

// CMRListPanePhysics::CMRListPanePhysics

// ---------------------------------------------------------------------------

//

CMRListPanePhysics::CMRListPanePhysics(

        CCoeControl& aParent, 

        CMRFieldContainer& aViewControl, 

        MMRPhysicsObserver& aPhysicsObserver )

    : iParent( aParent ),

      iViewControl( aViewControl ),

      iPhysicsObserver( aPhysicsObserver )

    {

    FUNC_LOG;

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::ConstructL

// ---------------------------------------------------------------------------

//

void CMRListPanePhysics::ConstructL()

    {

    FUNC_LOG;

    iFeatureEnabled = CAknPhysics::FeatureEnabled();

    if ( iFeatureEnabled )

        {

        // Physics: Create physics

        // Give pointer to control that should be able to flick/drag

        iPhysics = CAknPhysics::NewL( *this, &iViewControl );

        }

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::NewL

// ---------------------------------------------------------------------------

//

CMRListPanePhysics* CMRListPanePhysics::NewL( 

        CCoeControl& aParent, 

        CMRFieldContainer& aViewControl,

        MMRPhysicsObserver& aPhysicsObserver )

    {

    FUNC_LOG;

    CMRListPanePhysics* self = 

        new ( ELeave ) CMRListPanePhysics( 

                aParent, 

                aViewControl, 

                aPhysicsObserver );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::~CMRListPanePhysics

// ---------------------------------------------------------------------------

//

CMRListPanePhysics::~CMRListPanePhysics()

    {

    FUNC_LOG;

    delete iPhysics;

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::HandlePointerEventL

// ---------------------------------------------------------------------------

//

TBool CMRListPanePhysics::HandlePointerEventL(

        const TPointerEvent& aPointerEvent, TBool& aEventsBlocked )

    {

    FUNC_LOG;

    TBool physicsStarted( EFalse );

    if ( !iFeatureEnabled || iPhysics->OngoingPhysicsAction() ==

            CAknPhysics::EAknPhysicsActionBouncing )

        {

        return physicsStarted;

        }

    // Down

    if ( aPointerEvent.iType == TPointerEvent::EButton1Down )

        {

        // Save start time and start point

        iStartTime.HomeTime();

        iStartPoint = aPointerEvent.iPosition;

        iDragPoint = iStartPoint;

        }

    // Drag

    else if ( aPointerEvent.iType == TPointerEvent::EDrag )

        {

        // Check how position was changed and report to physics

        TPoint deltaPoint( iDragPoint - aPointerEvent.iPosition );

        if( Abs( deltaPoint.iY ) < KCustomDragTreshold )

        	{

			deltaPoint.iX = 0;

			deltaPoint.iY = 0;

        	}

        iDragPoint = aPointerEvent.iPosition;

        iPhysics->RegisterPanningPosition( deltaPoint );

        }

    // Up

    else if ( aPointerEvent.iType == TPointerEvent::EButton1Up )

        {

        // Calculate dragging distance

        TPoint drag( iStartPoint - aPointerEvent.iPosition );

        if( Abs( drag.iY ) < KCustomDragTreshold )

        	{

			drag.iX = 0;

			drag.iY = 0;

        	}

        // Start physics

        physicsStarted = iPhysics->StartPhysics( drag, iStartTime );

        if( physicsStarted )

        	{

			aEventsBlocked = ETrue;

        	}

        else

        	{

			aEventsBlocked = EFalse;

        	}

        }    

    // Record previous pointer event

    iPreviousPointerEvent = aPointerEvent;

    return physicsStarted;

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::InitPhysicsL

// ---------------------------------------------------------------------------

//

void CMRListPanePhysics::InitPhysics()

    {

    FUNC_LOG;

    if ( !iFeatureEnabled )

        {

        return;

        }    

    TRect parentRect( iParent.Rect() );

    iWorldSize.iHeight = iViewControl.MinimumSize().iHeight;

    iWorldSize.iWidth = iViewControl.MinimumSize().iWidth;

    iViewSize.iHeight = parentRect.Height();

    iViewSize.iWidth = parentRect.Width();

    if( iWorldSize.iHeight < iViewSize.iHeight )

        {

    	iWorldSize.iHeight = iViewSize.iHeight;

        }

    iPhysics->ResetFriction();

    TRAP_IGNORE( iPhysics->InitPhysicsL( iWorldSize, iViewSize, EFalse ) );

    iPhysics->UpdateViewWindowControl( &iParent );

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::SetWorldHeight

// ---------------------------------------------------------------------------

//

void CMRListPanePhysics::SetWorldHeight( TInt aWorldHeight )

    {

    FUNC_LOG;

    if ( !iFeatureEnabled )

        {

        return;

        }    

    iWorldSize.iHeight = aWorldHeight;

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::ViewPositionChanged

// ---------------------------------------------------------------------------

//

void CMRListPanePhysics::ViewPositionChanged( const TPoint& aNewPosition,

                          TBool aDrawNow,

                          TUint /*aFlags*/ )

    {

    FUNC_LOG;

    if ( !iFeatureEnabled )

        {

        return;

        }

    if ( iPhysics->OngoingPhysicsAction() ==

            CAknPhysics::EAknPhysicsActionBouncing )

        {

        return;

        }

    iVerScrollIndex = aNewPosition.iY - iViewSize.iHeight / 2;

    // Parents position is taken into account, by

    // adding the extra x and y coordinates to field containers

    // new position.

    iViewControl.SetPosition( TPoint( 

            iParent.Position().iX, 

            -iVerScrollIndex + iParent.Position().iY ) );

    // Draw only when drawing is allowed

    if ( aDrawNow )

        {

        iParent.DrawDeferred();

        }

    // Vertical scroll index has changed, we need to update scroll bar also

    iPhysicsObserver.UpdateScrollBarDuringOngoingPhysics();

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::PhysicEmulationEnded

// ---------------------------------------------------------------------------

//

void CMRListPanePhysics::PhysicEmulationEnded()

    {

    FUNC_LOG;

    iPhysicsObserver.PhysicsEmulationEnded();

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::ViewPosition

// ---------------------------------------------------------------------------

//

TPoint CMRListPanePhysics::ViewPosition() const

    {

    FUNC_LOG;

    if ( !iFeatureEnabled )

        {

        return TPoint( iParent.Position() );

        }

    // This is the default implementation

    TPoint viewPosition( 

            iViewSize.iWidth / 2, 

            iViewSize.iHeight / 2 + iVerScrollIndex );

    return viewPosition;

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::UpdateVerticalScrollIndex

// ---------------------------------------------------------------------------

//

void CMRListPanePhysics::UpdateVerticalScrollIndex( TInt aVerScrollIndex )

    {

    FUNC_LOG;

    if ( iFeatureEnabled )

        {

        // Physics' new position is updated to this member, when field 

        // container is scrolled by someone else than physics.

        iVerScrollIndex = aVerScrollIndex;

        }

    }

// ---------------------------------------------------------------------------

// CMRListPanePhysics::VerticalScrollIndex

// ---------------------------------------------------------------------------

//

TInt CMRListPanePhysics::VerticalScrollIndex()

    {

    return iVerScrollIndex;

    }

// End of file