#pragma once

#include <QObject>
#include <QList>
#include <QRectF>
#include <QMimeData>
#include "ZxPaintParam.h"
#include "ZxRenderAlign.h"
#include "iPlotBase_global.h"

class ZxRenderItem;
class ZxSceneItem;
class QTimer;
class QTime;
class ZxSelectionPrivate;
class ZxSelectionNode;

/// 当前选择的图件列表.
/// 已经为大数据量及频繁选择做了优化.
/// @note 此类的行为类似Qt的shared类.
class I_PLOTBASE_EXPORT ZxSelection
{
public:

public:
    ZxSelection();
    ZxSelection(const ZxSelection& c);
    ~ZxSelection();

    const ZxSelection& operator=(const ZxSelection& c);

//    // 获取实际对象, 以挂接信号
//    QObject & operator*();

//    // 获取实际对象, 以挂接信号
//    const QObject & operator*() const;

    /// 获取实际对象, 以挂接信号
    QObject* qobject() const;

    /// 获取所属的场景
    ZxSceneItem* getScene() const;

    /// 选择
    void add(ZxRenderItem* p, bool force = false);

    /// 选择
    void add(const QList<ZxRenderItem*> & items, bool force = false);

    /// 取消选择
    void remove(ZxRenderItem* p);

    /// 取消选择
    void remove(const QList<ZxRenderItem*> & items);

    /// 反选
    void invert(ZxRenderItem* p, bool force = false);

    /// 反选
    void invert(const QList<ZxRenderItem*> & items, bool force = false);

    /// 清除选择
    void clear();

    /// 获取第一个图元
    /// @return 列表不为空时返回第一个图元, 列表为空时返回NULL
    /// @see begin() end() last()
    ZxRenderItem* first() const;

    /// 获取最后一个图元
    /// @return 列表不为空时最后一个图元, 列表为空时返回NULL
    /// @see begin() end() first()
    ZxRenderItem* last() const;

    /// 转换成list
    QList<ZxRenderItem *> toList() const;

    class I_PLOTBASE_EXPORT const_iterator
    {
        ZxSelectionPrivate * imp;
        ZxSelectionNode* p;
        const_iterator(ZxSelectionPrivate * imp, ZxSelectionNode* p);
    public:
        const_iterator();
        ZxRenderItem* operator*();
        bool operator!=( const const_iterator& ) const;
        bool operator==( const const_iterator& ) const;
        const_iterator& operator++();
        friend class ZxSelection;
    };

    /// Returns an STL-style iterator pointing to the first item in the list.
    /// @see first() last() end()
    /// @code
    /// for(auto it = selection.begin(); it != selection.end(); ++it)
    /// {
    ///     ZxRenderItem* p = *it;
    ///     // do something
    /// }
    /// @endcode
    const_iterator begin() const;

    /// Returns an STL-style iterator pointing to the imaginary item after the last item in the list.
    /// @see last() last() begin()
    /// @code
    /// for(auto it = selection.begin(); it != selection.end(); ++it)
    /// {
    ///     ZxRenderItem* p = *it;
    ///     // do something
    /// }
    /// @endcode
    const_iterator end() const;

    /// 列表是否为空
    bool empty() const;

    /// 列表是否为空
    bool isEmpty() const;

    /// 是否单选
    bool isSingle() const;

    /// 选中的图元数量
    int count() const;

    // 选中的图元是否相同类型.
    // @return 类型相同或列表为空时返回true, 否则返回false.
    // @note 根据 item->getClassName() 来判断
    //bool isSameType() const;

    /// 选中的图元的边框的并集
    QRectF getBounds(ZxFilterFun filter = 0);

    /// 选中的图元是否有相同父节点
    bool hasSameParent() const;

    /// 移动选中的图元
    void move(float dx, float dy);

    /// 查找选中图元的最近公共祖先节点
    ZxRenderItem* findCommonAncestor() const;

    /// 对齐算法
    static QList<QRectF> calcAlign(const QList<QRectF> & rects, const QRectF& box, Zx::ChartObjAlign type);

    /// 对齐
    void align(Zx::ChartObjAlign mode);

    /// 目前选中的对象是否支持指定对齐方式
    bool canAlign(Zx::ChartObjAlign mode) const;

    /// 复制到剪贴板
    bool copy() const;

    /// 从剪贴板粘贴
    bool paste();

    /// 模拟重新选择, 可用来实现刷新属性表等功能
    void emulateReSelect();

	/// 判断是否含有指定图元.
	bool contains(ZxRenderItem* p) const;

private:

    ZxSelection(ZxSceneItem* pScene);
    ZxSelectionPrivate* imp;

    friend class ZxSceneItem;
    friend class ZxSelectionPrivate;
};