#pragma once

#include <QObject>
#include <QHash>
#include <QList>
#include <QRectF>

#include "iPlotBase_global.h"

class ZxRenderItem;
class ZxSceneItem;
class QTimer;
class QTime;

/// @internal
class ZxSelectionNode
{
public:
    ZxRenderItem* item;
    ZxSelectionNode* prev;
    ZxSelectionNode* next;
};

/// @internal
class ZxSelectionPrivate : public QObject
{
    Q_OBJECT

    static ZxSelectionNode* alloc();

    bool m_bChanged;
    ZxSelectionNode* head;
    ZxSelectionNode* tail;
    QHash<ZxRenderItem*, ZxSelectionNode*> dict;

    void listAdd(ZxSelectionNode* n);
    void listRemove(ZxSelectionNode* n);

    void doAdd(ZxRenderItem* w, bool force);
    void doRemove(ZxSelectionNode* n);

    void setChanged();

    QTime* m_pLazyChangedTime;
    QTimer* m_pTimer;

    int m_nRefCount;
    ZxSceneItem* m_pScene;

    ZxSelectionPrivate(ZxSceneItem* pScene);
    ~ZxSelectionPrivate();
    int release();
    int addRef();
    void add(ZxRenderItem* p, bool force = false);
    void remove(ZxRenderItem* p);
    void invert(ZxRenderItem* p, bool force = false);
    void clear();
	bool contains(ZxRenderItem* p) const;

signals:

    /// 个别图件被加进列表
    void sigItemAdded(ZxRenderItem* p);

    /// 个别图件被从列表移除
    void sigItemRemoved(ZxRenderItem* p);

    /// 选中列表被改变(即时)
    void sigSelectionChanged();

    /// 选中列表被改变(非即时)
    void sigSelectionChangedLazy();

protected slots:

    void onTimer();

private:

    ZxSelectionPrivate(const ZxSelectionPrivate& c);

    friend class ZxSelection;
};