gridctrl.cpp

Visual C++下的界面设计

    switch (nSBCode)
    {
        case SB_LINEDOWN:
            if (scrollPos < m_nVScrollMax)
            {
                int yScroll = GetRowHeight(idTopLeft.row);
                SetGridScrollPos(SB_VERT, scrollPos + yScroll);
                if (GetGridScrollPos(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);
                SetGridScrollPos(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());
                SetGridScrollPos(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);
                SetGridScrollPos(SB_VERT, pos);
                rect.top = GetFixedRowHeight();
                InvalidateRect(rect);
            }
            break;

        case SB_THUMBPOSITION:
        case SB_THUMBTRACK:
            {
                SetGridScrollPos(SB_VERT, nPos);
                rect.top = GetFixedRowHeight();
                InvalidateRect(rect);
            }
            break;

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

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

        default: break;
    }
}

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

#ifdef USE_MEMDC                        // Use a memDC for flicker free update
void CGridCtrl::OnDraw(CDC& DrawDC)
{
    CMemDC dc(&DrawDC);
#else                                   // Use normal DC - this helps in debugging
void CGridCtrl::OnDraw(CDC& dc)
{
#endif
    CRect rect;
    int row,col;

    CRect clipRect;
    if (dc.GetClipBox(&clipRect) == ERROR) return;

    EraseBkgnd(&dc);            // 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(&dc, 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(&dc, 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(&dc, 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(&dc, row, col, rect);
        }
    }

    // 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);
            dc.MoveTo(x-1, nFixedRowHeight);
            dc.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);
            dc.MoveTo(nFixedColWidth, y-1);    
            dc.LineTo(VisRect.right,  y-1);
        }
    }
}

/*
void OnGetListItems(int nCol, LPARAM cltList)
{
	// Do nothing, for now
}
*/
////////////////////////////////////////////////////////////////////////////////////////
// CGridCtrl Cell selection stuff

BOOL CGridCtrl::IsValid(int nRow, int nCol)
{
    return (nRow >= 0 && nRow < m_nRows && nCol >= 0 && nCol < m_nCols);
}

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

BOOL CGridCtrl::IsValid(const CCellRange& range)
{
     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 */)
{
    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
        pDC->SelectStockObject(BLACK_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);    
        }
    } 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 = bResult && RedrawCell(row, col, pDC);
    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 = bResult && RedrawCell(row, col, pDC);
    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 = m_idCurrentCell;
    m_idCurrentCell = cell;

    if (IsValid(idPrev)) {
        SetItemState(idPrev.row, idPrev.col, 
                     GetItemState(idPrev.row, idPrev.col) & ~GVIS_FOCUSED);
        RedrawCell(idPrev);

        if (idPrev.col != m_idCurrentCell.col)
            for (int row = 0; row < m_nFixedRows; row++) RedrawCell(row, idPrev.col);
        if (idPrev.row != m_idCurrentCell.row)
            for (int col = 0; col < m_nFixedCols; col++) RedrawCell(idPrev.row, col);
    }

    if (IsValid(m_idCurrentCell)) {
        SetItemState(m_idCurrentCell.row, m_idCurrentCell.col, 
                     GetItemState(m_idCurrentCell.row, m_idCurrentCell.col) | GVIS_FOCUSED);

        RedrawCell(m_idCurrentCell);

        if (idPrev.col != m_idCurrentCell.col)
            for (int row = 0; row < m_nFixedRows; row++) RedrawCell(row, m_idCurrentCell.col);
        if (idPrev.row != m_idCurrentCell.row)
            for (int col = 0; col < m_nFixedCols; col++) RedrawCell(m_idCurrentCell.row, col);
    }

    return idPrev;
}

// Sets the range of currently selected cells
void CGridCtrl::SetSelectedRange(const CCellRange& Range, 
                                 BOOL bForceRepaint /* = FALSE */)
{
    SetSelectedRange(Range.GetMinRow(), Range.GetMinCol(), Range.GetMaxRow(), Range.GetMaxCol(),
                     bForceRepaint);
}

void CGridCtrl::SetSelectedRange(int nMinRow, int nMinCol, int nMaxRow, int nMaxCol,
                                 BOOL bForceRepaint /* = FALSE */)
{
    if (!m_bEnableSelection) return;

    CDC* pDC = NULL;
    if (bForceRepaint) pDC = GetDC();

    // Unselect all previously selected cells
    for (POSITION pos = m_SelectedCellMap.GetStartPosition(); pos != NULL; )