/*

* Copyright (c) 2002-2004 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:  Edit mode for widget drag and drop.            

*

*/

// System includes

#include <AknUtils.h>

#include <gulgcmap.h>

#include <akntitle.h>

#include <barsread.h>

#include <xnuiengine.rsg>

#ifdef RD_TACTILE_FEEDBACK

#include <touchfeedback.h>

#endif // RD_TACTILE_FEEDBACK

// User includes

#include "xnappuiadapter.h"

#include "xnviewmanager.h"

#include "xnviewadapter.h"

#include "xnviewdata.h"

#include "xnnodeimpl.h"

#include "xndomnode.h"

#include "xnnode.h"

#include "xnproperty.h"

#include "xnuiengine.h"

#include "xncontroladapter.h"

#include "xnpopupcontroladapter.h"

#include "xnfocuscontrol.h"

#include "xneditor.h"

#include "xntype.h"

#include "xnmenu.h"

#include "xneditmode.h"

// Constants

_LIT8( KMenu, "menu" );

// ============================ LOCAL FUNCTIONS ================================

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

// CopyBitmap

// Copies a data from source bitmap to target bitmap.

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

//

static TInt CopyBitmap( CFbsBitmap& aTarget, const CFbsBitmap& aSource,        

    TPoint aSourcePoint )

    {

    TSize targetSize( aTarget.SizeInPixels() );

    TSize sourceSize( aSource.SizeInPixels() );

    TInt lineLength( targetSize.iWidth );

    TInt maxSourceLineLength( sourceSize.iWidth - aSourcePoint.iX );

    if ( lineLength > maxSourceLineLength )

        {

        lineLength = maxSourceLineLength;

        }

    TInt rowCount( targetSize.iHeight );

    TInt maxSourceRowCount( sourceSize.iHeight - aSourcePoint.iY );

    if ( rowCount > maxSourceRowCount )

        {

        rowCount = maxSourceRowCount;

        }

    // Get bitmap display mode

    TDisplayMode displayMode( aSource.DisplayMode() );

    // Create buffer for a scan line

    HBufC8* scanLine = HBufC8::New( aSource.ScanLineLength( 

        lineLength, displayMode ) );

    if ( !scanLine )

        {

        return KErrNoMemory;

        }

    TPtr8 scanPtr( scanLine->Des() );

    // Copy all rows to destination bitmap

    for ( TInt row = 0; row < rowCount; row++ )

        {

        aSource.GetScanLine( scanPtr,

            TPoint( aSourcePoint.iX, aSourcePoint.iY + row ),

            lineLength, displayMode );

        aTarget.SetScanLine( scanPtr, row );

        }

    delete scanLine;

    return KErrNone;

    }        

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

// SetVisibilityL

// Sets node either visible or hidden

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

//

static void SetVisibilityL( CXnNode& aNode, const TDesC8& aVisibility )

    {

    CXnUiEngine* engine( aNode.UiEngine() );

    CXnProperty* prop = CXnProperty::NewL(

            XnPropertyNames::style::common::KVisibility,

            aVisibility,

    CleanupStack::PushL( prop );

    aNode.SetPropertyL( prop );

    CleanupStack::Pop( prop );

    }

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

// ResolveMenuIdL

// Resolves <menu> element and its id based on aMenuBar <menubar> element 

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

//

static HBufC* ResolveMenuIdL( CXnNode& aMenuBar )

    {       

    HBufC* retval( NULL );

    RPointerArray< CXnNode >& children( aMenuBar.Children() );

    for ( TInt i = 0; i < children.Count(); i++ )

        {

        CXnNode* child( children[i] );

        if ( child->Type()->Type() == KMenu )

            {

            CXnProperty* prop( 

                child->GetPropertyL( XnPropertyNames::common::KId ) );

            if ( prop )

                {

                // Ownership is passed to the caller

                retval = prop->StringValueL();                

                }

            break;

            }

        }

    return retval;

    }

#ifdef RD_TACTILE_FEEDBACK

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

// Feedback

// Gives instant touch feedback

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

//

static void Feedback( TTouchLogicalFeedback aType )

    {

    MTouchFeedback* fb( MTouchFeedback::Instance() );

    if ( fb )

        {

        fb->InstantFeedback( aType );

        }                        

    }

#endif // RD_TACTILE_FEEDBACK

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

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

// CXnEditMode::CXnEditMode

// C++ default constructor can NOT contain any code, that

// might leave.

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

//

CXnEditMode::CXnEditMode( CXnUiEngine& aUiEngine )

    : iUiEngine( aUiEngine ), 

      iViewManager( *iUiEngine.ViewManager() ),

      iState( CXnEditMode::ENone ), 

      iStylusDownPos( TPoint::EUninitialized ),

      iPreviousPos( TPoint::EUninitialized ),

      iDrawPos( TPoint::EUninitialized ), 

      iLastDrawRect( TRect::EUninitialized )     

    {

    }

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

// CXnEditMode::ConstructL

// Symbian 2nd phase constructor can leave.

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

//

void CXnEditMode::ConstructL()

    {             

    CreateWindowL();

    ActivateL();            

    Window().SetRequiredDisplayMode( EColor16MA );

    if ( Window().SetTransparencyAlphaChannel() == KErrNone )

        {    

        Window().SetBackgroundColor( ~0 );

        }

    EnableDragEvents();

    CCoeControl::MakeVisible( EFalse );

    TRect rect;

    AknLayoutUtils::LayoutMetricsRect( AknLayoutUtils::EMainPane, rect );

    iMainpane = new ( ELeave ) CFbsBitmap;

    User::LeaveIfError( iMainpane->Create( TSize(), EColor16MA ) );

    iWidget = new ( ELeave ) CFbsBitmap;

    User::LeaveIfError( iWidget->Create( TSize(), EColor16MA ) );

    iBmpDevice = CFbsBitmapDevice::NewL( iMainpane );

    iBmpGc = CFbsBitGc::NewL();

    iBmpGc->Activate( iBmpDevice );

    iMapGc = CWindowToBitmapMappingGc::NewL(  

        *static_cast< CWsScreenDevice* >( SystemGc().Device() ), *iBmpGc );               

    SetRect( rect );    

    }

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

// CXnEditMode::NewL

// Two-phased constructor.

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

//

CXnEditMode* CXnEditMode::NewL( CXnUiEngine& aEngine )

    {

    CXnEditMode* self = new ( ELeave ) CXnEditMode( aEngine );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

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

// CXnEditMode::~CXnEditMode

// Destructor

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

//

CXnEditMode::~CXnEditMode()

    {    

    TRAP_IGNORE( StopDragL() );

    delete iMapGc;

    delete iBmpGc;

    delete iBmpDevice;

    delete iMainpane;

    delete iWidget;       

    }

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

// CXnEditMode::UpdateScreen

// Updates invalid parts of the screen. All drawing must be done from here

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

//

void CXnEditMode::UpdateScreen()

    {

    if ( iState == CXnEditMode::EDragging )

        {

        if ( !iWidget || iDrawPos == TPoint::EUninitialized )

            {

            return;

            }

        TRect drawRect( iDrawPos, iWidget->SizeInPixels() );

        if ( iLastDrawRect != TRect::EUninitialized )

            {

            drawRect.BoundingRect( iLastDrawRect );

            }

        iLastDrawRect = drawRect;

        DrawNow( drawRect );          

        }

    else 

        {

        if ( iLastDrawRect != TRect::EUninitialized )

            {

            DrawNow( iLastDrawRect );

            }

        iLastDrawRect = TRect::EUninitialized;        

        }

    }

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

// CXnEditMode::Draw

// 

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

//

void CXnEditMode::Draw( const TRect& aRect ) const

    {      

    CWindowGc& gc( SystemGc() );

    gc.SetClippingRect( Rect() );

    gc.Clear( aRect );

    if ( iWidget && iState == CXnEditMode::EDragging )

        {              

        gc.BitBlt( iDrawPos, iWidget );

        }

    gc.Reset();

    }

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

// CXnEditMode::MakeVisible

// 

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

//

void CXnEditMode::MakeVisible( TBool aVisible )

    {        

    TBool visible( IsVisible() ? ETrue : EFalse );

    if ( aVisible == visible )

        {

        return;

        }

    CCoeControl::MakeVisible( aVisible );

    CXnAppUiAdapter& appui( iUiEngine.AppUiAdapter() );

    // Remove focus

    appui.HideFocus();

    CCoeControl& bg( appui.ViewAdapter().BgControl() );

    if ( aVisible )

        {

        bg.DrawableWindow()->SetPointerGrab( EFalse );

        Window().SetOrdinalPosition( 0 );

        Window().SetPointerGrab( ETrue );

        Window().ClaimPointerGrab();               

        }

    else

        {

        Window().SetPointerGrab( EFalse );

        bg.DrawableWindow()->SetPointerGrab( ETrue );               

        }

    }

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

// CXnEditMode::HandlePointerEventL

//

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

//

void CXnEditMode::HandlePointerEventL( const TPointerEvent& aPointerEvent )

    {

    if ( !AknLayoutUtils::PenEnabled() )         

        {

        return;

        }

    if ( aPointerEvent.iType != TPointerEvent::EButton1Down &&

        iStylusDownPos == TPoint::EUninitialized )

        {

        return;

        }

    // For performance reasons, discard the event if delta between previous

    // event is within 'KOffset'.

    TInt KOffset( 5 );

    TRect rect(

        aPointerEvent.iPosition.iX - KOffset,

        aPointerEvent.iPosition.iY - KOffset,

        aPointerEvent.iPosition.iX + KOffset,

        aPointerEvent.iPosition.iY + KOffset );

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

        rect.Contains( iPreviousPos ) )

        {   

        return;                 

        }

    RPointerArray< CXnPluginData >& plugins( 

        iViewManager.ActiveViewData().PluginData() );

    CXnNode* node( NULL );

    for ( TInt i = 0; i < plugins.Count(); i++ )

        {   

        CXnPluginData* data( plugins[i] );

        CXnNode* plugin( data->Owner()->LayoutNode() );

        CXnControlAdapter* ctrl( plugin->Control() );

        if ( ctrl->IsVisible() && 

            ctrl->Rect().Contains( aPointerEvent.iPosition ) )        

            {                      

            node = plugin;

            break;

            }

        }

    if ( !node )

        {

        if ( iTargetNode )

            {

            iTargetNode->UnsetStateL( XnPropertyNames::style::common::KFocus );

            }

        iTargetNode = NULL;

        }

    if ( node && node != iTargetNode )

        {

        if ( !node->IsStateSet( XnPropertyNames::style::common::KEdit ) )

            {

            // Not in edit state

            node = NULL;

            }

        else

            {

            iTargetNode = node;

            iUiEngine.DisableRenderUiLC();

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

                {

                iUiEngine.AppUiAdapter().ShowFocus();

                node->SetStateL( XnPropertyNames::style::common::KFocus );

#ifdef RD_TACTILE_FEEDBACK                

                Feedback( ETouchFeedbackBasic );

#endif

                }

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

               {

               if ( iState == CXnEditMode::EDragging )

                   {

                   node->SetStateL( XnPropertyNames::style::common::KFocus );               

                   }

               else if ( iDraggingNode && 

                   !iDraggingNode->MarginRect().Contains( aPointerEvent.iPosition ) )

                   {

                   iDraggingNode->UnsetStateL( 

                       XnPropertyNames::style::common::KFocus );

                   iDraggingNode = NULL;

                   }                             

               }     

            CleanupStack::PopAndDestroy();

            }

        }

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

        {        

        iDragged = EFalse;

        if ( node )

            {

            CXnPluginData& plugin( iUiEngine.ViewManager()->

                    ActiveViewData().Plugin( node ) );

            if ( plugin.Occupied() )

                {

                StartDragL( *node );

                iDrawPos = iDraggingNode->BorderRect().iTl;

                iStylusDownPos = iPreviousPos = aPointerEvent.iPosition;

                }  

            else

                {

                iDraggingNode = node;

                iStylusDownPos = iPreviousPos = aPointerEvent.iPosition;

                }

            }

        }

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

        {

        const TInt KDragTreshold( 30 );

        TInt dx( Abs( aPointerEvent.iPosition.iX - iStylusDownPos.iX ) );

        TInt dy( Abs( aPointerEvent.iPosition.iY - iStylusDownPos.iY ) );

        TBool dragged( iDragged );

        if ( dx > KDragTreshold || dy > KDragTreshold )

            {

            iDragged = ETrue;

            if ( !dragged && iDragged && iDraggingNode && 

                iState == CXnEditMode::EDragging )

                {

                // Hide the node which will be dragged from layout tree 

                SetVisibilityL( *iDraggingNode,

                    XnPropertyNames::style::common::visibility::KHidden );

                iUiEngine.RenderUIL();                

                }

            }