A fast and lightweight cell control

// MyCell - version 1.0
// Written by Yanxueming <yanxm2003@hotmail.com>
// Copyright (C) 2006-2006
// All rights reserved.
//
// The code and information is provided "as-is" without
// warranty of any kind, either expressed or implied.
#pragma once
#include "base.h"
//#include "CellRange.h"
namespace mycell{
	class Grid;
	class HeaderDragImpl
	{
		Grid* pGrid_;
		int preSizingPos_;
		CellID sizingCell_;
		char dragDelta_;
		enum {GHOST_LINE_WIDTH=1};
	public:
		HeaderDragImpl(Grid* p):pGrid_(p){}
		BEGIN_MSG_MAP(HeaderDragImpl)
			MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove)
			MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)
			MESSAGE_HANDLER(WM_LBUTTONUP, OnLButtonUP)
		END_MSG_MAP()
	private:
		BOOL MouseOverColumnResizeArea(CellID cell,CellHitTestConstants hit)
		{
			if(-1==cell.row){
				if(cell.col>=0 && ( cellHTRight==hit || cellHTRightTop==hit || cellHTRightBottom==hit))
					return TRUE;
				if(cell.col>0 && (cellHTLeft==hit || cellHTLeftTop==hit || cellHTLeftBottom==hit))
					return TRUE;
			}
			return FALSE;
		}
		BOOL MouseOverRowResizeArea(CellID cell,CellHitTestConstants hit)
		{
			if(-1==cell.col){
				if(cell.row>=0 && (cellHTBottom==hit || cellHTLeftBottom==hit || cellHTRightBottom==hit))
					return TRUE;
				if(cell.row>0 && (cellHTTop==hit || cellHTLeftTop==hit || cellHTRightTop==hit) )
					return TRUE;
			}
			return FALSE;
		}
	private:
		LRESULT OnMouseMove(UINT nFlags,WPARAM,LPARAM lParam,BOOL&);
		LRESULT OnLButtonDown(UINT,WPARAM,LPARAM,BOOL&);
		LRESULT OnLButtonUP(UINT,WPARAM,LPARAM,BOOL&);
	};
}//namespace mycell