// GridCellBase.cpp: implementation of the CGridCellBase class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"

#include "GridCtrl.h"
#include "GridCellBase.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
IMPLEMENT_DYNAMIC(CGridCellBase, CObject)
CGridCellBase::CGridCellBase()
{
m_nState=0;//如果不對它初始化,非固定的單元格背景色會不對

}

CGridCellBase::~CGridCellBase()
{

}
BOOL CGridCellBase::Draw(CDC* pDC,int nRow,int nCol,CRect rect,BOOL bEraseBkgng/*=TRUE*/)
{
    CGridCtrl* pGrid = GetGrid();
    ASSERT(pGrid);

    if (!pGrid ||!pDC)
        return FALSE;

    if( rect.Width() <= 0 || rect.Height() <= 0)  // prevents imagelist item from drawing even
        return FALSE;                             //  though cell is hidden

    TRACE3("Drawing %scell %d, %d\n", IsFixed()? _T("Fixed ") : _T(""), nRow, nCol);

    int nSavedDC = pDC->SaveDC();
    pDC->SetBkMode(TRANSPARENT);//背景透明模式

	CGridDefaultCell *pDefaultCell = (CGridDefaultCell*) GetDefaultCell();//得到卻省得單元格設置
    if (!pDefaultCell)
        return FALSE;

	// Set up text and background colours
    COLORREF TextClr, TextBkClr;//文本色和文本背景色

	TextClr = (GetTextClr() == CLR_DEFAULT)? pDefaultCell->GetTextClr() : GetTextClr();//取得顏色
    if (GetBackClr() == CLR_DEFAULT)//CLR_DEFAULT是Windows卻省的背景顏色
        TextBkClr = pDefaultCell->GetBackClr();
    else
    {
       TextBkClr = GetBackClr();
    }

	if(!IsFixed())
	{
		TRY
		{
			CBrush brush(TextBkClr);
			pDC->FillRect(rect, &brush);//填充矩形
			
		} 
        CATCH(CResourceException, e)
		{
			e->ReportError();
		}
		END_CATCH
	}
	else
	{
		CPen lightpen(PS_SOLID, 1,  ::GetSysColor(COLOR_3DHIGHLIGHT)),
                darkpen(PS_SOLID,  1, ::GetSysColor(COLOR_3DDKSHADOW)),
                *pOldPen = pDC->GetCurrentPen();
		
		pDC->SelectObject(&lightpen);//使用亮色
        pDC->MoveTo(rect.right, rect.top);
        pDC->LineTo(rect.left, rect.top);//從右到左畫頂邊
        pDC->LineTo(rect.left, rect.bottom);//從上到下畫左邊

		pDC->SelectObject(&darkpen);//使用暗色
        pDC->MoveTo(rect.right, rect.top);
        pDC->LineTo(rect.right, rect.bottom);//從上到下畫右邊
        pDC->LineTo(rect.left, rect.bottom);//從右到左畫底邊

		pDC->SelectObject(pOldPen);//恢復筆

	}

	CFont *pFont = GetFontObject();//在這里選擇了字體
	ASSERT(pFont);

    if(pFont)
		pDC->SelectObject(pFont);
	

	// Draw sort arrow
	//畫排序箭頭:

    if (pGrid->GetSortColumn() == nCol && nRow == 0)//如果排序的列是nCol并且行號是0才畫
    {
        CSize size = pDC->GetTextExtent(_T("M"));
        int nOffset = 2;

        // Base the size of the triangle on the smaller of the column
        // height or text height with a slight offset top and bottom.
        // Otherwise, it can get drawn outside the bounds of the cell.
        size.cy -= (nOffset * 2);

        if (size.cy >= rect.Height())
            size.cy = rect.Height() - (nOffset * 2);

        size.cx = size.cy;      // Make the dimensions square

        // Kludge for vertical text
        BOOL bVertical = (GetFont()->lfEscapement == 900);

        // Only draw if it'll fit!
        if (size.cx + rect.left < rect.right+2)
        {
            int nTriangleBase = rect.bottom - nOffset - size.cy;    // Triangle bottom right
            int nTriangleLeft;
            if (bVertical)
                nTriangleLeft = (rect.right + rect.left - size.cx)/2; // Triangle middle
            else
                nTriangleLeft = rect.right - size.cx;               // Triangle RHS

            CPen penShadow(PS_SOLID, 0, /*::GetSysColor(COLOR_3DSHADOW)*/RGB(0,0,255));
            //CPen penLight(PS_SOLID, 0, ::GetSysColor(COLOR_3DHILIGHT));
            if (pGrid->GetSortAscending())//升序的
            {
                // Draw triangle pointing upwards
				//畫頂尖向上的三角形
                CPen *pOldPen = (CPen*) pDC->SelectObject(&penShadow/*penLight*/);
                pDC->MoveTo( nTriangleLeft-4 +(size.cx)/2, nTriangleBase +size.cy );
                pDC->LineTo( nTriangleLeft-4 +(size.cx)/2, nTriangleBase -(size.cy)/2-1);
                pDC->LineTo( nTriangleLeft-4 +(size.cx)-(size.cx)/4 , nTriangleBase+(size.cy)/4);
				pDC->MoveTo(nTriangleLeft-4 +(size.cx)/2, nTriangleBase-(size.cy)/2);
				pDC->LineTo( nTriangleLeft-4 +(size.cx)/4, nTriangleBase+(size.cy)/4 );
				pDC->SelectObject(pOldPen);
			}
			else
            {
                // Draw triangle pointing downwards
				//畫頂尖向下的三角形

                CPen *pOldPen = (CPen*) pDC->SelectObject(&penShadow);
                pDC->MoveTo( nTriangleLeft-4 + (size.cx )/ 2 , nTriangleBase - (size.cy)/2);
                pDC->LineTo( nTriangleLeft-4 + (size.cx )/ 2 , nTriangleBase + size.cy+1 );
                pDC->LineTo( nTriangleLeft-4 + (size.cx)- (size.cx)/4, nTriangleBase +(size.cy)/4);
				pDC->MoveTo(nTriangleLeft -4+ (size.cx )/2 , nTriangleBase + size.cy );
				pDC->LineTo(nTriangleLeft-4+(size.cx)/4 , nTriangleBase + (size.cy)/4 );
                pDC->SelectObject(pOldPen);
            }
            
            if (!bVertical)
                rect.right -= size.cy;
        }
    }
    //以上所有都是畫單元格的
	pDC->SetTextColor(TextClr);


	//以下是負責顯示文字的
    // We want to see '&' characters so use DT_NOPREFIX
	// 我們想看見'&'字符....
//    GetTextRect(rect);//文字要顯示的位置
    //DrawText(pDC->m_hDC, GetText(), -1, rect, GetFormat() | DT_NOPREFIX);
	DrawText(pDC->m_hDC, GetText(), -1, rect, DT_SINGLELINE|DT_CENTER|DT_VCENTER/*DT_LEFT/*GetFormat() | DT_NOPREFIX*/);
	//畫文字,DT_SINGLELINE|DT_BOTTOM|DT_RIGHT/*DT_LEFT*/是對齊方式的設定
    //DT_SINGLELINE|DT_VCENTER|DT_RIGHT(垂直居中右對齊)
	//DT_SINGLELINE|DT_CENTER|(水平居中)
	//DT_SINGLELINE|DT_CENTER|DT_VCENTER(垂直水平都居中)
	//這幾種組合都要結合DT_SINGLELINE設定才能見效


    pDC->RestoreDC(nSavedDC);//恢復原DC模式(不透明)

    return TRUE;
}

void CGridCellBase::operator=(const CGridCellBase& cell)
{
	if (this == &cell) return;

    SetGrid(cell.GetGrid());    // do first in case of dependencies
    SetText(cell.GetText());
    SetTextClr(cell.GetTextClr());
    SetBackClr(cell.GetBackClr());
    SetFont(cell.IsDefaultFont()? NULL : cell.GetFont());
    
}

// Returns a pointer to a cell that holds default values for this particular type of cell
CGridCellBase* CGridCellBase::GetDefaultCell() const
{
    if (GetGrid())//得到表格類的指針
		//返回保存在表格類中的缺省單元格的信息:
        return GetGrid()->GetDefaultCell(IsFixedRow(), IsFixedCol());
    return NULL;
}