/*

* 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:

*

*/

#ifndef HGCONTAINER_H

#define HGCONTAINER_H

#include <QTime>

#include <HbWidget>

#include <hgwidgets/hgwidgets.h>

#include "hgmediawalldataprovider.h"

#include "hgdrag.h"

#include "hgspring.h"

class HgWidgetItem;

class HgQuadRenderer;

class HgMediaWallRenderer;

class QPanGesture;

class HbAbstractViewItem;

class HbGestureSceneFilter;

class HgLongPressVisualizer;

class HgContainer: public HbWidget, public HgMediaWallDataProvider

{

    Q_OBJECT

    Q_DISABLE_COPY(HgContainer)

public:

    explicit HgContainer(QGraphicsItem* parent = 0);

    virtual ~HgContainer();

    void setItemCount(int count);

    int itemCount() const;

    int rowCount() const;

    QList<HgWidgetItem*> items() const;

    HgWidgetItem* itemByIndex(const QModelIndex &index) const;

    HgWidgetItem* itemByIndex(const int &index) const;

    void setSelectionModel(QItemSelectionModel *selectionModel, const QModelIndex &defaultItem);

    QItemSelectionModel *selectionModel() const;

    void setSelectionMode(HgWidget::SelectionMode mode, bool resetSelection);

    HgWidget::SelectionMode selectionMode() const;

    void dimensions(qreal &screenSize, qreal &worldSize);

    Qt::Orientation orientation() const;

    void setOrientation(Qt::Orientation orientation, bool animate=true);

    // new size for the widget. calls resize.

    void scrollToPosition(qreal value, bool animate = false);

    virtual void scrollToPosition(const QPointF& pos, bool animate);

    void scrollTo(const QModelIndex &index);

    void itemDataChanged(const QModelIndex &firstIndex, const QModelIndex &lastIndex);

    void addItems(int start, int end);

    void removeItems(int start, int end);

    void moveItems(int start, int end, int destination);

    bool getItemPoints(int index, QPolygonF& points);

    QList<QModelIndex> getVisibleItemIndices() const;

    virtual void itemDataChanged(const int &firstIndex, const int &lastIndex);

    void init(Qt::Orientation scrollDirection);

    void setDefaultImage(QImage defaultImage);

    void setItemSizePolicy(HgWidget::ItemSizePolicy policy);

    HgWidget::ItemSizePolicy itemSizePolicy() const;

    void setItemSize(const QSizeF& size);

    QSizeF itemSize() const;

    void setItemSpacing(const QSizeF& size);

    QSizeF itemSpacing() const;

    Qt::Orientation scrollDirection() const;

    qreal scrollPosition() const;

signals:

    // emit this signal when scrolling. for example scrollbar can be connected to this signal.

    void scrollPositionChanged(qreal value, bool scrollBarAnimation);

    void centerItemChanged(const QModelIndex &index);

    void activated(const QModelIndex &index);

    void longPressed(const QModelIndex &index, const QPointF &coords);

    void scrollingStarted();

    void scrollingEnded();

protected slots:

    virtual void onScrollingStarted();

    virtual void onScrollingEnded();

private slots:

    void updateBySpringPosition();

    void redraw();

    void updateLongPressVisualizer();

protected: // from HgMediaWallDataProvider

    int imageCount() const;

    const HgImage *image(int index) const;

    int flags(int index) const;

    const HgImage *indicator(int flags) const;

protected: // events

    virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

    virtual void resizeEvent(QGraphicsSceneResizeEvent *event);

    // this needs to be implemented for gesture framework to work

    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);

    // From HbWidget for gestures.

    virtual void gestureEvent(QGestureEvent *event);

protected:

    virtual HgMediaWallRenderer* createRenderer(Qt::Orientation scrollDirection)=0;

    virtual qreal getCameraDistance(qreal springVelocity);

    virtual qreal getCameraRotationY(qreal springVelocity);

    virtual void handleTapAction(const QPointF& pos, HgWidgetItem* hitItem, int hitItemIndex);

    virtual void handleLongTapAction(const QPointF& pos, HgWidgetItem* hitItem, int hitItemIndex);

    virtual void onScrollPositionChanged(qreal pos);

protected:

    enum ItemActionType

    {

        LongTap = 1,

        DoubleTap,

        NormalTap,

        TapStart,

        LongTapStart

    };

    qreal worldWidth() const;

    void initSpringForScrollBar();

    void initSpringForScrolling();

    void boundSpring();

    bool handlePanning(QPanGesture *gesture);

    bool handleTap(Qt::GestureState state, const QPointF &pos);

    bool handleLongTap(Qt::GestureState state, const QPointF &pos);

    bool handleItemAction(const QPointF &pos, ItemActionType action);

    void selectItem(int index);

    void updateSelectedItem();

    void unselectItem();

    bool hasItemAt(const QPointF& pos);

    HgWidgetItem* getItemAt(const QPointF& pos, int& index);

    void startLongPressWatcher(const QPointF& pos);

    void stopLongPressWatcher();

    bool updateSelectionModel(HgWidgetItem* item);

    virtual void updateItemSizeAndSpacing();

    virtual QSizeF getAutoItemSize() const;

    virtual QSizeF getAutoItemSpacing() const;

protected: // data

    QList<HgWidgetItem *> mItems;

    //int mRowCount;

    //int mColumnCount;

    //HbLabel *mLabel;

    HgQuadRenderer *mQuadRenderer;

    HgMediaWallRenderer *mRenderer;

    HgSpring mSpring;

    HgDrag mDrag;

    QTime mTapDuration; // Temp hack until HbTapGesture is available

    QTime mDoubleTapDuration;

    int mTapCount;

    bool mAnimateUsingScrollBar;

    HgWidget::SelectionMode mSelectionMode;

    QItemSelectionModel *mSelectionModel;

    HgImage *mMarkImageOn;

    HgImage *mMarkImageOff;

    qreal mSpringVelAtDragStart;

    bool mDragged;

    int mFramesDragged;

    HbAbstractViewItem* mHitItemView;

    QPixmap mHitItemPixmap;

    HgLongPressVisualizer* mLongPressVisualizer;

    QTimer* mLongPressTimer;

    HgWidgetItem* mHitItem;

    int mHitItemIndex;

    QPointF mOffsetAtDragStart;

    QTime mLongTapDuration;

    bool mScrollBarPressed;

    HgWidget::ItemSizePolicy mItemSizePolicy;

    QSizeF mUserItemSize;

    QSizeF mUserItemSpacing;

    Qt::Orientation mOrientation;

    QModelIndex mDelayedScrollToIndex;

    bool mIgnoreGestureAction;

};

#endif