gridctrl.cpp

操作系统演示程序

            break;

        case SB_RIGHT:
            if (scrollPos < m_nHScrollMax)
            {
                SetScrollPos32(SB_HORZ, m_nHScrollMax);
                Invalidate();
            }
            break;


        default: break;
    }
}

// Handle vert scrollbar notifications
void CGridCtrl::OnVScroll(UINT nSBCode, UINT /*nPos*/, CScrollBar* /*pScrollBar*/)
{
    if (GetFocus()->GetSafeHwnd() != GetSafeHwnd()) 
        SetFocus();        // Auto-destroy any InPlaceEdit's

#ifndef GRIDCONTROL_NO_TITLETIPS
    m_TitleTip.Hide();  // hide any titletips
#endif

    // Get the scroll position ourselves to ensure we get a 32 bit value
    int scrollPos = GetScrollPos32(SB_VERT);

    CCellID idTopLeft = GetTopleftNonFixedCell();

    CRect rect;
    GetClientRect(rect);

    switch (nSBCode)
    {
        case SB_LINEDOWN:
            if (scrollPos < m_nVScrollMax)
            {
                int yScroll = GetRowHeight(idTopLeft.row);
                SetScrollPos32(SB_VERT, scrollPos + yScroll);
                if (GetScrollPos32(SB_VERT) == scrollPos) 
                    break;          // didn't work

                rect.top = GetFixedRowHeight() + yScroll;
                ScrollWindow( 0, -yScroll, rect);
                rect.top = rect.bottom - yScroll;
                InvalidateRect(rect);
            }
            break;

        case SB_LINEUP:
            if (scrollPos > 0 && idTopLeft.row > GetFixedRowCount())
            {
                int yScroll = GetRowHeight(idTopLeft.row-1);
                SetScrollPos32(SB_VERT, max(0, scrollPos - yScroll));
                rect.top = GetFixedRowHeight();
                ScrollWindow(0, yScroll, rect);
                rect.bottom = rect.top + yScroll;
                InvalidateRect(rect);
            }
            break;

        case SB_PAGEDOWN:
            if (scrollPos < m_nVScrollMax)
            {
                rect.top = GetFixedRowHeight();
                scrollPos = min(m_nVScrollMax, scrollPos + rect.Height());
                SetScrollPos32(SB_VERT, scrollPos);
                rect.top = GetFixedRowHeight();
                InvalidateRect(rect);
            }
            break;

        case SB_PAGEUP:
            if (scrollPos > 0)
            {
                rect.top = GetFixedRowHeight();
                int offset = -rect.Height();
                int pos = max(0, scrollPos + offset);
                SetScrollPos32(SB_VERT, pos);
                rect.top = GetFixedRowHeight();
                InvalidateRect(rect);
            }
            break;

        case SB_THUMBPOSITION:
        case SB_THUMBTRACK:
            {
                SetScrollPos32(SB_VERT, GetScrollPos32(SB_VERT, TRUE));
                CCellID idNewTopLeft = GetTopleftNonFixedCell();
                if (idNewTopLeft != idTopLeft)
                {
                    rect.top = GetFixedRowHeight();
                    InvalidateRect(rect);
                }
            }
            break;

        case SB_TOP:
            if (scrollPos > 0)
            {
                SetScrollPos32(SB_VERT, 0);
                Invalidate();
            }
            break;

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

        default: break;
    }
}

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

void CGridCtrl::OnDraw(CDC* pDC)
{
    CRect rect;
    int row,col;

    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.

    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();

    // draw top-left cells 0..m_nFixedRows-1, 0..m_nFixedCols-1
    rect.bottom = -1;
    for (row = 0; row < m_nFixedRows; row++)
    {
        rect.top = rect.bottom+1;
        rect.bottom = rect.top + GetRowHeight(row)-1;
        rect.right = -1;
        for (col = 0; col < m_nFixedCols; col++)
        {
            rect.left = rect.right+1;
            rect.right = rect.left + GetColumnWidth(col)-1;  
            
            DrawFixedCell(pDC, row, col, rect);
        }
    }
     
    // draw fixed column cells:  m_nFixedRows..n, 0..m_nFixedCols-1
    rect.bottom = nFixedRowHeight-1;
    for (row = minVisibleRow; row <= maxVisibleRow; row++)
    {
        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++)
        {
            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?

            DrawFixedCell(pDC, row, col, rect);
        }
    }
    
    // draw fixed row cells  0..m_nFixedRows, m_nFixedCols..n
    rect.bottom = -1;
    for (row = 0; row < m_nFixedRows; row++)
    {
        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++)
        {                                       
            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?

            DrawFixedCell(pDC, row, col, rect);
        }
    }
    
    // draw rest of non-fixed cells
    rect.bottom = nFixedRowHeight-1;
    for (row = minVisibleRow; row <= maxVisibleRow; row++)
    {
        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++)
        {
            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?

            DrawCell(pDC, row, col, rect);
        }
    }


    CPen pen;
    TRY {
        pen.CreatePen(PS_SOLID, 0, m_crGridColour);
    }
    CATCH (CResourceException, e)
    {
        e->Delete();
        return;
    }
    END_CATCH
    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++) {
            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++) {
            y += GetRowHeight(row);
            pDC->MoveTo(nFixedColWidth, y-1);    
            pDC->LineTo(VisRect.right,  y-1);
        }
    }

    pDC->SelectStockObject(NULL_PEN);

#ifdef USE_MEMDC                        // Use a memDC for flicker free update
}
#else                                   // Use normal DC - this helps in debugging
}
#endif

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

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);
}

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) 
        Invalidate();
    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)
        {
            bResult = DrawFixedCell(pDC, nRow, nCol, rect, TRUE);
        }
        else
        {
            bResult = DrawCell(pDC, nRow, nCol, rect, TRUE);
            
            // Since we have erased the background, we will need to redraw the gridlines
            CPen pen;
            TRY {
                pen.CreatePen(PS_SOLID, 0, m_crGridColour);
            } CATCH (CException, e) {e->Delete();} END_CATCH
                
                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) 
            {