/*

* Copyright (c) 2010 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: 

*

*/

#include "SlidingWidget.h"

#include "ChromeSnippet.h"

#include <QDebug>

//NB: Note that the current implementation only supports one snippet child

namespace GVA {

  SlidingWidget::SlidingWidget(QGraphicsItem* parent)

    : QGraphicsWidget(parent),

      m_top(0),

      m_window(0),

      m_bottom(0),

      m_slideMax(0),

      m_slidePos(0)

  {

    //Clip child item so that it can "slide" out of view

    setFlags(QGraphicsItem::ItemClipsChildrenToShape);

    //setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));

    m_layout = new QGraphicsAnchorLayout();

    m_layout->setContentsMargins(0,0,0,0);

    m_layout->setSpacing(0);

    setLayout(m_layout);

  }

  SlidingWidget:: ~SlidingWidget()

  {

  }

  void SlidingWidget::resizeEvent(QGraphicsSceneResizeEvent *ev)

  {

    qDebug() << "SlidingWidget::resizeEvent: " << ev->newSize();

    if(m_window)

      m_window->resize(ev->newSize());

      //m_window->resize(ev->newSize().width(), m_window->size().height());

    QGraphicsWidget::resizeEvent(ev);

  }

  qreal SlidingWidget::slide(qreal delta)

  {

    qreal newPos = m_slidePos + delta;

    //qDebug() << "SlidingWidget::slide: delta: " << delta << " m_slidePos: " << m_slidePos << " newPos: " << newPos;

    if(newPos < 0) {

      if(m_slidePos == 0)

	return 0;

      delta = -m_slidePos;

      m_slidePos = 0;

    }

    else if(newPos > m_slideMax){

      if(m_slidePos == m_slideMax)

	return 0;

      delta = m_slideMax - m_slidePos;

      m_slidePos = m_slideMax;

    }

    else m_slidePos = newPos;

    //qDebug() << "calculated delta: " << delta << " new m_slidePos: " << m_slidePos;

    QTransform transform;

    transform.translate(0,delta);

    //m_window->setTransform(transform, true);

    //m_top->setTransform(transform, true);

    m_top->setPos(0, m_top->pos().y() + delta);

    m_window->setPos(0, m_window->pos().y() + delta);

    return delta;

  }

  void SlidingWidget::setWindow(QGraphicsWidget * window)

  {

    if(m_window)

      m_window->setParentItem(0);

    m_window = window;

    m_window->setParentItem(this);

    m_window->resize(size());

    if(m_top) {

    	slide(0);

    	QGraphicsWidget* item=m_top;

    	attachItem(item);

    }

    else

      m_window->setPos(0,0);

    //m_layout->addAnchors(m_window, m_layout, Qt::Horizontal);

  }

  void SlidingWidget::attachItem(QGraphicsWidget * item)

  {

    if(m_top)

      detachItem(m_top);

    m_top = item;

    m_top->setParentItem(this);

    m_top->setPos(0,0);

    m_slideMax =  m_top->size().height();

    m_slidePos = m_slideMax;

    if(m_window)

      m_window->setPos(0, m_top->size().height());

  }

  void SlidingWidget::detachItem(QGraphicsWidget * item)

  {

    if(m_top != item)

      return;

    m_top->setParentItem(0);

    m_top = 0;

    if(m_window)

      m_window->setPos(0,0);

  }

} // end of namespace GVA