#pragma once

#include <QPointF>
#include <QCursor>
#include "ZxPaintParam.h"

#include "ZxEdit.h"
#include "IxInterface.h"
#include "iPlotBase_global.h"

class QPainter;
class ZxRenderItem;
class ZxRenderView;
class ZxSimpleTool;
class ZxSceneItem;
class ZxTool;
class QUndoCommand;
class ZxSelection;

/// 策略基类
class I_PLOTBASE_EXPORT ZxPolicy
        : public QObject
        , virtual public IxInterface
{
    Q_OBJECT

public:

    ZxPolicy();

    /// 获取所属的图件
    virtual ZxRenderItem* getItem() const;

    template<typename T> T getItem() const
    {
        T p = dynamic_cast<T>(getItem());
        Q_ASSERT(p);
        return p;
    }

    /// 获取所属的Edit
    virtual ZxEdit* getEdit() const;

    /// 获取所属的Scene
    virtual ZxSceneItem* getScene() const;

    /// 获取当前工具
    virtual ZxTool* getCurrentTool() const;

    /// 获取当前视图
    virtual ZxRenderView* getCurrentToolView() const;

    /// 刷新
    /// @note 相当于 getItem()->update()
    virtual void update();

    /// 尝试把工具压到当前工具栈中
    /// @note 弹栈用 pTool->detach()
    /// @param pTool 要压栈的工具
    /// @return 成功放回true, 失败返回false.
    bool pushTool(ZxSimpleTool* pTool);

    /// 工具弹栈
    void popTool(ZxSimpleTool* pTool);

    /// 键按下
    virtual void onKeyPress(QKeyEvent* event);

    /// 键抬起
    virtual void onKeyRelease(QKeyEvent* event);

    /// 运行一个命令. 相当于getScene()->pushCommand()
    virtual bool pushCommand(QUndoCommand* cmd);

    /// 相当于getScene()->getSelection()
    virtual ZxSelection getSelection();

    /// 设置静态模式.
    /// @note 静态模式是指在图元被取消选择时不自动删除policy.
    void setStatic(bool bStatic);

    /// 是否静态模式
    bool isStatic() const;

protected:

    /// 激活
    virtual void onActivate();
    virtual void onDeactivate();

    /// Edit关联
    virtual void onAddToEdit();
    virtual void onRemoveFromEdit();

    /// 准备菜单
    virtual void onPrepareContextMenu(QMenu* pMenu, const QPointF& pos);

    /// Move+Resize
    virtual void onItemMove(const QPointF& ptOld, const QPointF& ptNew);
    virtual void onItemResize(const QSizeF& szOld, const QSizeF& szNew);

    virtual void onPaint(QPainter* painter, const ZxPaintParam& param);

private:

    void setEdit(ZxEdit* p);

private:

    ZxRenderItem* m_pItem;
    bool m_bStatic : 1;

    friend class ZxEdit;
};