/*

* Copyright (c) 2007 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:  flowlayoutmanager implementation

*

*/

#include <alf/alfexceptions.h>

#include <alf/alfwidgetcontrol.h>

#include <alf/alfflowlayoutmanager.h>

#include <osn/ustring.h>

#include <osn/osnnew.h>

#include "alfflowlayoutpolicyimpl.h"

#include "alfflowlayoutpreferencesimpl.h"

using osncore::UString;

using namespace Alf;

namespace Alf

    {

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

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

// layout manager constructor

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

//

OSN_EXPORT AlfFlowLayoutManager::AlfFlowLayoutManager() 

    : AlfLayoutManager(EAlfLayoutTypeFlow)

    {

    mData.reset(new (EMM) AlfFlowLayoutPolicyImpl(*this));

    mPrefImpl.reset(new (EMM) AlfFlowLayoutPreferencesImpl(*this));

    }

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

// virtual destructor

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

//

OSN_EXPORT AlfFlowLayoutManager::~AlfFlowLayoutManager()

    {

    }

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

// from AlfLayoutManager

// notifies the layout manager, that the child control's layout

// must be updated.

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

//

OSN_EXPORT void AlfFlowLayoutManager::updateChildLayout(

    CAlfWidgetControl* aControl)

    {

    CAlfLayout& layout = getLayout();

    doUpdateChildLayout(aControl);

    layout.UpdateChildrenLayout();

    //doUpdateChildLayout changes the visual size and position.

    //need to notify the widget that size and position has changed. 

    //for aControl both the size and position might have changes.

    //Only the position changes for all the controls after aControl. 

    //set the size and postion for aControl

    TAlfRealRect rect;

    if (controlRect(*aControl, rect)) //returns the real rect (of the root visual)

        {

        setControlRect(*aControl, rect);

        }

    //update the position for controls after aControl in layout.

    const int childrenCount = count();

    bool childControlFound = false;

    for (int i = 0; i < childrenCount; i++)

        {

        CAlfWidgetControl* child = getControl(i);

        if (childControlFound && controlRect(*child, rect))

            {

            setControlPosition(*child, rect.iTl);

            }

        else if (child == aControl)

            {

            childControlFound = true;

            }

        }

    // Inform parent layout manager about the changed presentation size

    owner().updateParentLayout();

    }

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

// From class IAlfInterfaceBase.

// Getter for interfaces provided by the element.

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

//

OSN_EXPORT IAlfInterfaceBase* AlfFlowLayoutManager::makeInterface( 

    const IfId& aType )

    {

    UString param(aType.mImplementationId);

    IAlfInterfaceBase* ret = 0;

    ret = mData->makeInterface(aType);

    if (!ret)

        {

        ret = mPrefImpl->makeInterface(aType);

        }

    if (!ret)

        {

        ret = AlfLayoutManager::makeInterface(aType);

        }

    return ret;

    }

    } // Alf