nim_duilib/examples/virtualbox/VirtualTileBox.h

#pragma once

typedef std::function<void(int nStartIndex, int nEndIndex)> DataChangedNotify;
typedef std::function<void()> CountChangedNotify;

class UILIB_API VirtualTileInterface: public nbase::SupportWeakCallback
{
public:
	VirtualTileInterface();
	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD>ش<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	*/
	virtual ui::Control* CreateElement() = 0;

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[in] control <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD>ָ<EFBFBD><EFBFBD>
	* @param[in] index <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD>ش<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	*/
	virtual void FillElement(ui::Control *control, int index) = 0;

	/**
	* @brief <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	*/
	virtual int GetElementtCount() = 0;

	void RegNotifys(const DataChangedNotify& dcNotify, const CountChangedNotify& ccNotify);

protected:
	void EmitDataChanged(int nStartIndex, int nEndIndex);
	void EmitCountChanged();

private:
	DataChangedNotify m_DataChangedNotify;
	CountChangedNotify m_CountChangedNotify;
};

class UILIB_API VirtualTileLayout : public ui::TileLayout
{
public:
	VirtualTileLayout();
	virtual ui::CSize ArrangeChild(const std::vector<ui::Control*>& items, ui::UiRect rc) override;
	virtual ui::CSize AjustSizeByChild(const std::vector<ui::Control*>& items, ui::CSize szAvailable) override;
	virtual bool SetAttribute(const std::wstring& strName, const std::wstring& strValue) override;
	virtual int GetElementsHeight(int nCount);
	virtual void LazyArrangeChild();
	virtual int AjustMaxItem();

private:
	bool m_bAutoCalcColumn;
};

class UILIB_API VirtualTileBox : public ui::ListBox
{
	friend class VirtualTileLayout;
public:
	VirtualTileBox(ui::Layout* pLayout = new VirtualTileLayout);

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[in] pProvider <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>д VirtualListInterface <EFBFBD>Ľӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ݴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	virtual void SetDataProvider(VirtualTileInterface *pProvider);

	virtual VirtualTileInterface* GetDataProvider();

	/**
	* @brief ˢ<EFBFBD><EFBFBD><EFBFBD>б<EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	virtual void Refresh();

	/**
	* @brief ɾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	virtual void RemoveAll() override;

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>ǿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><EFBFBD><EFBFBD>
	* @param[in] bForce <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ true Ϊǿ<EFBFBD>ƣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>ǿ<EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	void SetForceArrange(bool bForce);

	/**
	* @brief <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>пɼ<EFBFBD><EFBFBD>ؼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[out] collection <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	void GetDisplayCollection(std::vector<int>& collection);

	/**
	* @brief <EFBFBD>ÿؼ<EFBFBD><EFBFBD>ڿɼ<EFBFBD><EFBFBD><EFBFBD>Χ<EFBFBD><EFBFBD>
	* @param[in] iIndex <EFBFBD>ؼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[in] bToTop <EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϸ<EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	void EnsureVisible(int iIndex, bool bToTop = false);

protected:
	/// <20><>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD>ӿڣ<D3BF><DAA3>ṩ<EFBFBD><E1B9A9><EFBFBD>Ի<EFBFBD><D4BB><EFBFBD><EFBFBD><EFBFBD>
	virtual void SetScrollPos(ui::CSize szPos) override;
	virtual void HandleMessage(ui::EventArgs& event) override;
	virtual void SetPos(ui::UiRect rc) override;

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[in] bForce <EFBFBD>Ƿ<EFBFBD>ǿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	void ReArrangeChild(bool bForce);

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD>̰<EFBFBD><EFBFBD><EFBFBD>֪ͨ
	* @param[in] ch <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	virtual void OnKeyDown(TCHAR ch) {}

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD>̵<EFBFBD><EFBFBD><EFBFBD>֪ͨ
	* @param[in] ch <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD>
	*/
	virtual void OnKeyUp(TCHAR ch) {}

private:
	enum ScrollDirection
	{
		kScrollUp = -1,
		kScrollDown = 1
	};

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD>ش<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	*/
	Control* CreateElement();

	/**
	* @brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[in] control <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؼ<EFBFBD>ָ<EFBFBD><EFBFBD>
	* @param[in] index <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD>ش<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	*/
	void FillElement(Control *pControl, int iIndex);

	/**
	* @brief <EFBFBD><EFBFBD>ȡԪ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
	*/
	int GetElementCount();

	/**
	* @brief <EFBFBD>õ<EFBFBD>n<EFBFBD><EFBFBD>Ԫ<EFBFBD>ض<EFBFBD>Ӧ<EFBFBD>ĸ߶Ⱥͣ<EFBFBD>
	* @param[in] nCount Ҫ<EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>صĸ߶ȣ<EFBFBD>-1<EFBFBD><EFBFBD>ʾȫ<EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>صĸ߶Ⱥ<EFBFBD>
	*/
	int CalcElementsHeight(int nCount);

	/**
	* @brief <EFBFBD>õ<EFBFBD><EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD>Χ<EFBFBD>ڵ<EFBFBD>һ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ص<EFBFBD>ǰһ<EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @param[out] bottom <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ص<EFBFBD> bottom ֵ
	* @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Ԫ<EFBFBD>ص<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	*/
	int GetTopElementIndex(int &bottom);

	/**
	* @brief <EFBFBD>ж<EFBFBD>ij<EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD>ڿɼ<EFBFBD><EFBFBD><EFBFBD>Χ<EFBFBD><EFBFBD>
	* @param[in] iIndex Ԫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	* @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD> true <EFBFBD><EFBFBD>ʾ<EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ɼ<EFBFBD>
	*/
	bool IsElementDisplay(int iIndex);

	/**
	* @brief <EFBFBD>ж<EFBFBD><EFBFBD>Ƿ<EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><EFBFBD><EFBFBD>
	* @param[out] direction <EFBFBD><EFBFBD><EFBFBD>Ϲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¹<EFBFBD><EFBFBD><EFBFBD>
	* @return true Ϊ<EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><EFBFBD>֣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ false
	*/
	bool NeedReArrange(ScrollDirection &direction);

	VirtualTileLayout* GetTileLayout();

	int GetRealElementHeight();

	int GetColumns();

	void LazyArrangeChild();

	void OnModelDataChanged(int nStartIndex, int nEndIndex);
	
	void OnModelCountChanged();

	int ElementIndexToItemIndex(int nElementIndex);

	int ItemIndexToElementIndex(int nItemIndex);

private:
	VirtualTileInterface *m_pDataProvider;
	int m_nMaxItemCount;	// <20>б<EFBFBD><D0B1><EFBFBD>ʵ<EFBFBD>ؼ<EFBFBD><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>  
	int m_nOldYScrollPos;
	bool m_bArrangedOnce;
	bool m_bForceArrange;	// ǿ<>Ʋ<EFBFBD><C6B2>ֱ<EFBFBD><D6B1><EFBFBD>
};