gridctrl.cpp

這是一個可以計算學期成績的視窗程式 是利用讀入純文字檔案 來計算學期成績和平均

        }
        break;
        
    case SB_BOTTOM:
        if (scrollPos < m_nVScrollMax)
        {
            SetScrollPos32(SB_VERT, m_nVScrollMax);
            Invalidate();
        }
        
    default: 
        break;
    }
}

/////////////////////////////////////////////////////////////////////////////
// CGridCtrl implementation functions

void CGridCtrl::OnDraw(CDC* pDC)
{
    if (!m_bAllowDraw)
        return;

    CRect clipRect;
    if (pDC->GetClipBox(&clipRect) == ERROR)
        return;

    EraseBkgnd(pDC);            // OnEraseBkgnd does nothing, so erase bkgnd here.
    // This necessary since we may be using a Memory DC.

#ifdef _DEBUG
	LARGE_INTEGER iStartCount;
	QueryPerformanceCounter(&iStartCount);
#endif

    CRect rect;
    int row, col;
    CGridCellBase* pCell;

    int nFixedRowHeight = GetFixedRowHeight();
    int nFixedColWidth  = GetFixedColumnWidth();

    CCellID idTopLeft = GetTopleftNonFixedCell();
    int minVisibleRow = idTopLeft.row,
        minVisibleCol = idTopLeft.col;

    CRect VisRect;
    CCellRange VisCellRange = GetVisibleNonFixedCellRange(VisRect);
    int maxVisibleRow = VisCellRange.GetMaxRow(),
        maxVisibleCol = VisCellRange.GetMaxCol();

    if (GetVirtualMode())
        SendCacheHintToParent(VisCellRange);

    // draw top-left cells 0..m_nFixedRows-1, 0..m_nFixedCols-1
    rect.bottom = -1;
    for (row = 0; row < m_nFixedRows; row++)
    {
        if (GetRowHeight(row) <= 0) continue;

        rect.top = rect.bottom+1;
        rect.bottom = rect.top + GetRowHeight(row)-1;
        rect.right = -1;

        for (col = 0; col < m_nFixedCols; col++)
        {
            if (GetColumnWidth(col) <= 0) continue;

            rect.left = rect.right+1;
            rect.right = rect.left + GetColumnWidth(col)-1;

            pCell = GetCell(row, col);
            if (pCell)
			{
				pCell->SetCoords(row,col);
                pCell->Draw(pDC, row, col, rect, FALSE);
			}
        }
    }

    // draw fixed column cells:  m_nFixedRows..n, 0..m_nFixedCols-1
    rect.bottom = nFixedRowHeight-1;
    for (row = minVisibleRow; row <= maxVisibleRow; row++)
    {
        if (GetRowHeight(row) <= 0) continue;

        rect.top = rect.bottom+1;
        rect.bottom = rect.top + GetRowHeight(row)-1;

        // rect.bottom = bottom pixel of previous row
        if (rect.top > clipRect.bottom)
            break;                // Gone past cliprect
        if (rect.bottom < clipRect.top)
            continue;             // Reached cliprect yet?

        rect.right = -1;
        for (col = 0; col < m_nFixedCols; col++)
        {
            if (GetColumnWidth(col) <= 0) continue;

            rect.left = rect.right+1;
            rect.right = rect.left + GetColumnWidth(col)-1;

            if (rect.left > clipRect.right)
                break;            // gone past cliprect
            if (rect.right < clipRect.left)
                continue;         // Reached cliprect yet?

            pCell = GetCell(row, col);
            if (pCell)
			{
				pCell->SetCoords(row,col);
                pCell->Draw(pDC, row, col, rect, FALSE);
			}
        }
    }

    // draw fixed row cells  0..m_nFixedRows, m_nFixedCols..n
    rect.bottom = -1;
    for (row = 0; row < m_nFixedRows; row++)
    {
        if (GetRowHeight(row) <= 0) continue;

        rect.top = rect.bottom+1;
        rect.bottom = rect.top + GetRowHeight(row)-1;

        // rect.bottom = bottom pixel of previous row
        if (rect.top > clipRect.bottom)
            break;                // Gone past cliprect
        if (rect.bottom < clipRect.top)
            continue;             // Reached cliprect yet?

        rect.right = nFixedColWidth-1;
        for (col = minVisibleCol; col <= maxVisibleCol; col++)
        {
            if (GetColumnWidth(col) <= 0) continue;

            rect.left = rect.right+1;
            rect.right = rect.left + GetColumnWidth(col)-1;

            if (rect.left > clipRect.right)
                break;        // gone past cliprect
            if (rect.right < clipRect.left)
                continue;     // Reached cliprect yet?

            pCell = GetCell(row, col);
            if (pCell)
			{
				pCell->SetCoords(row,col);
                pCell->Draw(pDC, row, col, rect, FALSE);
			}
        }
    }

    // draw rest of non-fixed cells
    rect.bottom = nFixedRowHeight-1;
    for (row = minVisibleRow; row <= maxVisibleRow; row++)
    {
        if (GetRowHeight(row) <= 0) continue;

        rect.top = rect.bottom+1;
        rect.bottom = rect.top + GetRowHeight(row)-1;

        // rect.bottom = bottom pixel of previous row
        if (rect.top > clipRect.bottom)
            break;                // Gone past cliprect
        if (rect.bottom < clipRect.top)
            continue;             // Reached cliprect yet?

        rect.right = nFixedColWidth-1;
        for (col = minVisibleCol; col <= maxVisibleCol; col++)
        {
            if (GetColumnWidth(col) <= 0) continue;

            rect.left = rect.right+1;
            rect.right = rect.left + GetColumnWidth(col)-1;

            if (rect.left > clipRect.right)
                break;        // gone past cliprect
            if (rect.right < clipRect.left)
                continue;     // Reached cliprect yet?

            pCell = GetCell(row, col);
            // TRACE(_T("Cell %d,%d type: %s\n"), row, col, pCell->GetRuntimeClass()->m_lpszClassName);
            if (pCell)
			{
				pCell->SetCoords(row,col);
                pCell->Draw(pDC, row, col, rect, FALSE);
			}
        }
    }


    CPen pen;
    pen.CreatePen(PS_SOLID, 0, m_crGridLineColour);
    pDC->SelectObject(&pen);

    // draw vertical lines (drawn at ends of cells)
    if (m_nGridLines == GVL_BOTH || m_nGridLines == GVL_VERT)
    {
        int x = nFixedColWidth;
        for (col = minVisibleCol; col <= maxVisibleCol; col++)
        {
            if (GetColumnWidth(col) <= 0) continue;

            x += GetColumnWidth(col);
            pDC->MoveTo(x-1, nFixedRowHeight);
            pDC->LineTo(x-1, VisRect.bottom);
        }
    }

    // draw horizontal lines (drawn at bottom of each cell)
    if (m_nGridLines == GVL_BOTH || m_nGridLines == GVL_HORZ)
    {
        int y = nFixedRowHeight;
        for (row = minVisibleRow; row <= maxVisibleRow; row++)
        {
            if (GetRowHeight(row) <= 0) continue;

            y += GetRowHeight(row);
            pDC->MoveTo(nFixedColWidth, y-1);
            pDC->LineTo(VisRect.right,  y-1);
        }
    }

    pDC->SelectStockObject(NULL_PEN);

    // Let parent know it can discard it's data if it needs to.
    if (GetVirtualMode())
       SendCacheHintToParent(CCellRange(-1,-1,-1,-1));

#ifdef _DEBUG
	LARGE_INTEGER iEndCount;
	QueryPerformanceCounter(&iEndCount);
	TRACE1("Draw counter ticks: %d\n", iEndCount.LowPart-iStartCount.LowPart);
#endif

}

////////////////////////////////////////////////////////////////////////////////////////
// CGridCtrl Cell selection stuff

// Is a given cell designation valid (ie within the bounds of our number
// of columns/rows)?
BOOL CGridCtrl::IsValid(int nRow, int nCol) const
{
    return (nRow >= 0 && nRow < m_nRows && nCol >= 0 && nCol < m_nCols);
}

BOOL CGridCtrl::IsValid(const CCellID& cell) const
{
    return IsValid(cell.row, cell.col);
}

// Is a given cell range valid (ie within the bounds of our number
// of columns/rows)?
BOOL CGridCtrl::IsValid(const CCellRange& range) const
{
    return (range.GetMinRow() >= 0 && range.GetMinCol() >= 0 &&
        range.GetMaxRow() >= 0 && range.GetMaxCol() >= 0 &&
        range.GetMaxRow() < m_nRows && range.GetMaxCol() < m_nCols &&
        range.GetMinRow() <= range.GetMaxRow() && range.GetMinCol() <= range.GetMaxCol());
}

// Enables/Disables redraw for certain operations like columns auto-sizing etc,
// but not for user caused things such as selection changes.
void CGridCtrl::SetRedraw(BOOL bAllowDraw, BOOL bResetScrollBars /* = FALSE */)
{
//    TRACE(_T("%s: Setting redraw to %s\n"),
//             GetRuntimeClass()->m_lpszClassName, bAllowDraw? _T("TRUE") : _T("FALSE"));

    if (bAllowDraw && !m_bAllowDraw)
    {
        m_bAllowDraw = TRUE;
        Refresh();
    }

    m_bAllowDraw = bAllowDraw;
    if (bResetScrollBars)
        ResetScrollBars();
}

// Forces a redraw of a cell immediately (using a direct DC construction,
// or the supplied dc)
BOOL CGridCtrl::RedrawCell(const CCellID& cell, CDC* pDC /* = NULL */)
{
    return RedrawCell(cell.row, cell.col, pDC);
}

BOOL CGridCtrl::RedrawCell(int nRow, int nCol, CDC* pDC /* = NULL */)
{
    BOOL bResult = TRUE;
    BOOL bMustReleaseDC = FALSE;

    if (!m_bAllowDraw || !IsCellVisible(nRow, nCol))
        return FALSE;

    CRect rect;
    if (!GetCellRect(nRow, nCol, rect))
        return FALSE;

    if (!pDC)
    {
        pDC = GetDC();
        if (pDC)
            bMustReleaseDC = TRUE;
    }

    if (pDC)
    {
        // Redraw cells directly
        if (nRow < m_nFixedRows || nCol < m_nFixedCols)
        {
            CGridCellBase* pCell = GetCell(nRow, nCol);
            if (pCell)
                bResult = pCell->Draw(pDC, nRow, nCol, rect, TRUE);
        }
        else
        {
            CGridCellBase* pCell = GetCell(nRow, nCol);
            if (pCell)
                bResult = pCell->Draw(pDC, nRow, nCol, rect, TRUE);

            // Since we have erased the background, we will need to redraw the gridlines
            CPen pen;
            pen.CreatePen(PS_SOLID, 0, m_crGridLineColour);

            CPen* pOldPen = (CPen*) pDC->SelectObject(&pen);
            if (m_nGridLines == GVL_BOTH || m_nGridLines == GVL_HORZ)
            {
                pDC->MoveTo(rect.left,    rect.bottom);
                pDC->LineTo(rect.right + 1, rect.bottom);
            }
            if (m_nGridLines == GVL_BOTH || m_nGridLines == GVL_VERT)
            {
                pDC->MoveTo(rect.right, rect.top);
                pDC->LineTo(rect.right, rect.bottom + 1);
            }
            pDC->SelectObject(pOldPen);
        }
    } else
        InvalidateRect(rect, TRUE);     // Could not get a DC - invalidate it anyway
    // and hope that OnPaint manages to get one

    if (bMustReleaseDC)
        ReleaseDC(pDC);

    return bResult;
}

// redraw a complete row
BOOL CGridCtrl::RedrawRow(int row)
{
    BOOL bResult = TRUE;

    CDC* pDC = GetDC();
    for (int col = 0; col < GetColumnCount(); col++)
        bResult = RedrawCell(row, col, pDC) && bResult;
    if (pDC)
        ReleaseDC(pDC);

    return bResult;
}

// redraw a complete column
BOOL CGridCtrl::RedrawColumn(int col)
{
    BOOL bResult = TRUE;

    CDC* pDC = GetDC();
    for (int row = 0; row < GetRowCount(); row++)
        bResult = RedrawCell(row, col, pDC) && bResult;
    if (pDC)
        ReleaseDC(pDC);

    return bResult;
}


// Sets the currently selected cell, returning the previous current cell
CCellID CGridCtrl::SetFocusCell(int nRow, int nCol)
{
    return SetFocusCell(CCellID(nRow, nCol));
}

CCellID CGridCtrl::SetFocusCell(CCellID cell)
{
    if (cell == m_idCurrentCell)
        return m_idCurrentCell;

    CCellID idPrev