/*

* 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: 

*

*/

#ifndef VISUALFLOWLITE_H

#define VISUALFLOWLITE_H

#include <QWidget>

#include <QKeyEvent>

#include "FlowInterface.h"

class QPainter;

namespace WRT {

class VisualFlowLite : public FlowInterface

{

Q_OBJECT

public:

    VisualFlowLite(QWidget* parent);

    void init();

    void addSlide(const QImage& image);

    void clear();

    int slideCount() const;

    QImage slide(int index) const;

    void setCenterIndex(int i);

    int centerIndex() const;

    bool slideAnimationOngoing() const;

    void setCenterThumbnail(int i);

    void setCurrentIndex(int i);

    virtual ~VisualFlowLite();

    void keyPressEvent(QKeyEvent* event);

    void paintEvent(QPaintEvent* event);

    void calculateLayout();

    void showPrevious();

    void showNext();

    void paintNormalState(QPaintEvent* event);

    void paintInTransition(QPaintEvent* event);

    void setImagesScaled(bool scaled) { m_scalingAllowed = scaled; }

    QRect centralRect() const;

signals:

    void centerIndexChanged(int index);

    void ok(int index);

    void cancel();

public slots:

    bool calcRepaintRect();

    bool animatePlaceHolderPosition();

    void scroll();

protected:

    void mousePressEvent(QMouseEvent* event);

    void resizeEvent(QResizeEvent* event);

    void mouseMoveEvent(QMouseEvent* event);

    void mouseReleaseEvent(QMouseEvent* event);

private:

    enum PaintState {

        paintStateNormal,

        paintStateInTransition

    };

    void paintImage(QPainter* painter, QRect rect, QImage image);

    // indicates the index of the center thumbnail

    int                      m_centerPageIndex;

    QRect                    m_offscreenRect;

    // represents the entry corresponding to the selected page in view

    // timer used to do animation

    QTimer*                   m_repaintTimer;

    //repaint rect using during animating initial display of the view

    QRect                    m_repaintRect;

    //resize factor applied during initial display animation

    int                      m_resizeFactor;

    //left place holder rectangle

    QRect                    m_leftPlaceHolderRect;

    //left place holder rectangle

    QRect                    m_centerPlaceHolderRect;

    //left place holder rectangle

    QRect                    m_rightPlaceHolderRect;

    //Left Arrow position

    QPoint                   m_leftArrow[3];

    //Right arrow position

    QPoint                   m_rightArrow[3];

    //Factor used during animation of place holders

    int                      m_placeHolderResizeFactor;

    //Direction of movement

    int                      m_direction;

    //Flag to check if fast animation is needed or not

    bool                     m_fastScroll;

    PaintState               m_paintState;

    // Initial position 

    int m_currentIndex;

    QList<const QImage*> m_imageList;

    QPoint m_lastMoveEventPos;

    QTimer* m_scrollTimer;

    bool m_scalingAllowed;

};

}

#endif      // VISUALFLOWLITE_H