/*

* 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:   AknStylusPopUpMenu physics handler

*

*/

#include <stdlib.h>

#include <aknphysics.h>

#include <aknphysicsobserveriface.h>

#include <AknUtils.h>

#include <touchfeedback.h>

#include "aknstyluspopupmenuphysicshandler.h"

#include "aknstyluspopupmenucontent.h"

const TInt KNoItemSelected( -1 ); 

// ======== MEMBER FUNCTIONS ========

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

// CAknStylusPopUpMenuPhysicsHandler::NewL

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

//

 CAknStylusPopUpMenuPhysicsHandler* CAknStylusPopUpMenuPhysicsHandler::NewL(

    CAknStylusPopUpMenuContent* aPopUpMenuContent )

    {

    CAknStylusPopUpMenuPhysicsHandler* self = 

        CAknStylusPopUpMenuPhysicsHandler::NewLC( aPopUpMenuContent );

    CleanupStack::Pop( self );

    return self;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::NewLC

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

//

CAknStylusPopUpMenuPhysicsHandler* CAknStylusPopUpMenuPhysicsHandler::NewLC( 

    CAknStylusPopUpMenuContent* aPopUpMenuContent )

    {

    CAknStylusPopUpMenuPhysicsHandler* self 

        = new ( ELeave ) CAknStylusPopUpMenuPhysicsHandler( aPopUpMenuContent );

    CleanupStack::PushL( self );

    self->ConstructL();

    return self;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::~CAknStylusPopUpMenuPhysicsHandler

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

//

CAknStylusPopUpMenuPhysicsHandler::~CAknStylusPopUpMenuPhysicsHandler()

    {

    delete iPhysics;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::HandlePointerEventL

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

//

void CAknStylusPopUpMenuPhysicsHandler::HandlePointerEventL( const TPointerEvent& aPointerEvent )

    {

    // EButton1Down

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

        {

        TBool wasScrolling = ( iPhysics->OngoingPhysicsAction() != 

            CAknPhysics::EAknPhysicsActionNone );

        iPosition = aPointerEvent.iPosition;

        iStartPosition = aPointerEvent.iPosition;

        StopPhysics();

        iStartTime.HomeTime();

        iPanningActivated = EFalse;

        iPressedDown = ETrue;

        // if pointer event (EButton1Down) inside items rect, launch higlight timer

        // if content was not flicking, set also item to be selected

        TPoint adjustedPosition( aPointerEvent.iPosition + TPoint(0, Offset() ) );

        TInt item = iPopUpMenuContent->ContainingItem( adjustedPosition );

        if ( item != KNoItemSelected )

            {

            if ( !wasScrolling )

                {

                SetHighlight( item );

                CCoeEnv::Static()->WsSession().Finish();

                }

            MTouchFeedback* feedback = MTouchFeedback::Instance();

            if ( feedback )

                {

                feedback->InstantFeedback( NULL,

                                           aPointerEvent );

                }

            }

        }

    // EDrag    

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

        {

        TInt distanceFromStart( iStartPosition.iY - aPointerEvent.iPosition.iY );

        if ( !iPanningActivated && Abs( distanceFromStart ) > DragThreshold() )

            {

            iPanningActivated = ETrue;

            iPosition = aPointerEvent.iPosition;

            // clear highlight

            iPopUpMenuContent->SetHighlight( KNoItemSelected );

            }

        if ( iPanningActivated )

            {

            TInt deltaY( iPosition.iY - aPointerEvent.iPosition.iY );

            iPosition = aPointerEvent.iPosition;

            iPhysics->RegisterPanningPosition( TPoint( 0, deltaY ) );

            }

        }

    // EButton1Up   

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

        {

        iPressedDown = EFalse;              

        TPoint adjustedPosition( aPointerEvent.iPosition + TPoint(0, Offset() ) );

        TInt item = iPopUpMenuContent->ContainingItem( adjustedPosition );

        TPoint distance( 0, iStartPosition.iY - aPointerEvent.iPosition.iY );

        if ( iPhysics->StartPhysics( distance, iStartTime ) )

            {

            return;

            }

        // select item 

        if ( !iPanningActivated && 

                iPopUpMenuContent->CurrentItem() != KNoItemSelected )

            {

            if ( iViewRect.Contains( aPointerEvent.iPosition ) )

                {

                        iPopUpMenuContent->CurrentItem() );

                }

            else 

                {

                // Clear highlight

                SetHighlight( KNoItemSelected );

                }

            }

        }

   }

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

// CAknStylusPopUpMenuPhysicsHandler::SetViewRect

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

//

void CAknStylusPopUpMenuPhysicsHandler::SetViewRect( const TRect& aRect )

    {

    iViewRect = aRect;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::SetItemHeight

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

//

void CAknStylusPopUpMenuPhysicsHandler::SetItemHeight( TInt aItemHeight )

    {

    iItemHeight = aItemHeight;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::SetWorldHeight

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

//

void CAknStylusPopUpMenuPhysicsHandler::SetWorldHeight( TInt aWorldHeight )

    {

    iWorldHeight = aWorldHeight;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::Offset

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

//

TInt CAknStylusPopUpMenuPhysicsHandler::Offset() const 

    {

    if ( iItemHeight == 0 )

        {

        return 0;

        }

    if ( iScrollIndex < 0 )

        {

        return iScrollIndex;

        }

    if ( iScrollIndex >= iWorldHeight - iViewRect.Height() )

        {

        return iScrollIndex - ( iWorldHeight - iViewRect.Height() );

        }   

    return iScrollIndex % iItemHeight;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::InitPhysicsL

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

//   

void CAknStylusPopUpMenuPhysicsHandler::InitPhysicsL()

    {

    TSize worldSize( iViewRect.Width(), iWorldHeight );

    TSize viewSize( iViewRect.Width(), iViewRect.Height() );

    iPhysics->InitPhysicsL( worldSize, viewSize, EFalse );

    }

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

// CAknStylusPopUpMenuPhysicsHandler::HandleScrollEvent

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

//     

void CAknStylusPopUpMenuPhysicsHandler::HandleScrollEvent( TInt aNewScrollIndex )

    {

    iScrollIndex = aNewScrollIndex;

    ScrollView();                        

    }

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

// CAknStylusPopUpMenuPhysicsHandler::Reset

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

//

void CAknStylusPopUpMenuPhysicsHandler::Reset()

    {

    iPrevOffset = -1;

    iPrevTopmostItem = -1;

    iScrollIndex = 0;

    }

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

// CAknStylusPopUpMenuPhysicsHandler::ViewPositionChanged

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

//

void CAknStylusPopUpMenuPhysicsHandler::ViewPositionChanged(

    const TPoint& aNewPosition,

    TBool aDrawNow,

    TUint /*aFlags*/ )

    {

    iScrollIndex = aNewPosition.iY - iViewRect.Height() / 2;

    ScrollView( aDrawNow );

    }

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

// CAknStylusPopUpMenuPhysicsHandler::PhysicEmulationEnded

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

//    

void CAknStylusPopUpMenuPhysicsHandler::PhysicEmulationEnded()

    {

    }

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

// CAknStylusPopUpMenuPhysicsHandler::ViewPosition

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

//    

TPoint CAknStylusPopUpMenuPhysicsHandler::ViewPosition() const

    {

    return TPoint( iViewRect.Width() / 2, iScrollIndex + iViewRect.Height() / 2 ); 

    }

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

// CAknStylusPopUpMenuPhysicsHandler::CAknStylusPopUpMenuPhysicsHandler

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

//

CAknStylusPopUpMenuPhysicsHandler::CAknStylusPopUpMenuPhysicsHandler( 

    CAknStylusPopUpMenuContent* aPopUpMenuContent )

    :

    iPopUpMenuContent( aPopUpMenuContent ),

    iPhysics( NULL ),

    iPrevOffset( -1 ),

    iPrevTopmostItem( -1 ),

    iOffsetItemCount( 0 )

    {

    }

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

// CAknStylusPopUpMenuPhysicsHandler::ConstructL

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

//

void CAknStylusPopUpMenuPhysicsHandler::ConstructL()

    {

    iPhysics = CAknPhysics::NewL( *this, iPopUpMenuContent );

    }

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

// CAknStylusPopUpMenuPhysicsHandler::DragThreshold

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

//     

TInt CAknStylusPopUpMenuPhysicsHandler::DragThreshold()

    {

    return iPhysics->DragThreshold();

    }

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

// CAknStylusPopUpMenuPhysicsHandler::SetHighlight

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

//     

void CAknStylusPopUpMenuPhysicsHandler::SetHighlight( TInt aItem )

    {

    iPopUpMenuContent->SetHighlight( aItem );

    }

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

// CAknStylusPopUpMenuPhysicsHandler::ScrollView

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

//     

void CAknStylusPopUpMenuPhysicsHandler::ScrollView( TBool aDrawNow )

    {

    if ( iItemHeight != 0 )

        {

        TInt scrollIndex( Min( iScrollIndex, iWorldHeight - iViewRect.Height() ) );

        TInt topmostItem( scrollIndex / iItemHeight );

        // Update view based on topmostItem and offset.

        // Offset is retrieved from Physics handler by PopupMenuContent

        // inside this function call.

        // Update only if topmost item or offset changed 

        if ( aDrawNow &&

             ( topmostItem != iPrevTopmostItem || Offset() != iPrevOffset ) )

            {

            iPopUpMenuContent->UpdateView( topmostItem );

            }

        iPrevOffset = Offset();

        iPrevTopmostItem = topmostItem;    

        //when appear or dispear a tiem,a feedback was given.

              && ( iPrevOffset/iItemHeight ) != iOffsetItemCount )

            {

            if ( iPhysics )

                {

                    {

                    case CAknPhysics::EAknPhysicsActionBouncing:

                        {

                        MTouchFeedback* feedback = MTouchFeedback::Instance();

                        if ( feedback )

                            {

                            feedback->InstantFeedback( iPopUpMenuContent,

                            }

                        break;

                        }

                    default:

                        break;

                    }

                }

            }

        }

    }

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

// CAknStylusPopUpMenuPhysicsHandler::StopPhysics

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

//

void CAknStylusPopUpMenuPhysicsHandler::StopPhysics()

    {

    iPhysics->StopPhysics();

    iPhysics->ResetFriction();

    }