gridctrl.cpp

操作系统演示程序

                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 = m_idCurrentCell;
    m_idCurrentCell = cell;

    if (IsValid(idPrev)) 
    {
        SendMessageToParent(idPrev.row, idPrev.col, GVN_SELCHANGING); 

        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);

        SendMessageToParent(m_idCurrentCell.row, m_idCurrentCell.col, GVN_SELCHANGED); 
    }

    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; )
    {
        DWORD key;
        CCellID cell;
        m_SelectedCellMap.GetNextAssoc(pos, key, (CCellID&)cell);

        // Reset the selection flag on the cell
        if (IsValid(cell)) {
            SetItemState(cell.row, cell.col, 
                         GetItemState(cell.row, cell.col) & ~GVIS_SELECTED);

            // If this is to be reselected, continue on past the redraw
            if (nMinRow <= cell.row && cell.row <= nMaxRow &&
                nMinCol <= cell.col && cell.col <= nMaxCol)
                    continue;

            if (bForceRepaint && pDC)                    // Redraw NOW
                RedrawCell(cell.row, cell.col, pDC);
            else
                InvalidateCellRect(cell);                // Redraw at leisure
        }
    }
    
    // if any previous selected cells are to be retained (eg Ctrl is being held down)
    // then copy them to the newly created list, and mark all these cells as
    // selected
    if (!GetSingleRowSelection())
    for (pos = m_PrevSelectedCellMap.GetStartPosition(); pos != NULL; /* nothing */)
    {
        DWORD key;
        CCellID cell;
        m_PrevSelectedCellMap.GetNextAssoc(pos, key, (CCellID&)cell);

        if (!IsValid(cell))
            continue;

        int nState = GetItemState(cell.row, cell.col);

        // Set state as Selected. This will add the cell to m_SelectedCells[]
        SetItemState(cell.row, cell.col, nState | GVIS_SELECTED);

        // Redraw (immediately or at leisure)
        if (bForceRepaint && pDC)
            RedrawCell(cell.row, cell.col, pDC);
        else
            InvalidateCellRect(cell);
    }

    // Now select all cells in the cell range specified. If the cell has already
    // been marked as selected (above) then ignore it.
    if (nMinRow >= 0 && nMinCol >= 0 && nMaxRow >= 0 && nMaxCol >= 0 &&
        nMaxRow < m_nRows && nMaxCol < m_nCols &&
         nMinRow <= nMaxRow && nMinCol <= nMaxCol)
    {
        for (int row = nMinRow; row <= nMaxRow; row++)
            for (int col = nMinCol; col <= nMaxCol; col++) 
            {
                int nState = GetItemState(row, col);
                if (nState & GVIS_SELECTED)
                    continue;    // Already selected - ignore

                // Add to list of selected cells
                CCellID cell(row, col);

                // Set state as Selected. This will add the cell to m_SelectedCells[]
                SetItemState(row, col, nState | GVIS_SELECTED);

                // Redraw (immediately or at leisure)
                if (bForceRepaint && pDC)
                    RedrawCell(row, col, pDC);
                else
                    InvalidateCellRect(cell);
            }
    }
//    TRACE(_T("%d cells selected.\n"), m_SelectedCellMap.GetCount());

    if (pDC != NULL) 
        ReleaseDC(pDC);
} 

// selects all cells
void CGridCtrl::SelectAllCells()
{
    if (!m_bEnableSelection)
        return;

    SetSelectedRange(m_nFixedRows, m_nFixedCols, GetRowCount()-1, GetColumnCount()-1);
}

// selects columns
void CGridCtrl::SelectColumns(CCellID currentCell)
{
    if (!m_bEnableSelection)
        return;

    //if (currentCell.col == m_idCurrentCell.col) return;
    if (currentCell.col < m_nFixedCols)
        return;
    if (!IsValid(currentCell))
        return;

    SetSelectedRange(GetFixedRowCount(), 
                     min(m_SelectionStartCell.col, currentCell.col), 
                     GetRowCount()-1,    
                     max(m_SelectionStartCell.col, currentCell.col)); 
}

// selects rows
void CGridCtrl::SelectRows(CCellID currentCell)
{  
    if (!m_bEnableSelection)
        return;

    //if (currentCell.row; == m_idCurrentCell.row) return;
    if (currentCell.row < m_nFixedRows)
        return;
    if (!IsValid(currentCell))
        return;

    if (GetListMode() && GetSingleRowSelection())
        SetSelectedRange(currentCell.row, GetFixedColumnCount(),
                         currentCell.row, GetColumnCount()-1);
    else 
        SetSelectedRange(min(m_SelectionStartCell.row, currentCell.row),
                         GetFixedColumnCount(), 
                         max(m_SelectionStartCell.row, currentCell.row), 
                         GetColumnCount()-1); 
}

// selects cells
void CGridCtrl::SelectCells(CCellID currentCell)
{
    if (!m_bEnableSelection) 
        return;

    int row = currentCell.row;
    int col = currentCell.col;
    if (row < m_nFixedRows || col < m_nFixedCols)
        return;
    if (!IsValid(currentCell))
        return;

    // Prevent unnecessary redraws
    //if (currentCell == m_LeftClickDownCell)  return;
    //else if (currentCell == m_idCurrentCell) return;

    SetSelectedRange(min(m_SelectionStartCell.row, row), 
                     min(m_SelectionStartCell.col, col), 
                     max(m_SelectionStartCell.row, row),
                     max(m_SelectionStartCell.col, col)); 
}

void CGridCtrl::OnSelecting(const CCellID& currentCell)
{
    if (!m_bEnableSelection) 
        return;

    switch(m_MouseMode)
    {
        case MOUSE_SELECT_ALL:   SelectAllCells();            break;
        case MOUSE_SELECT_COL:   SelectColumns(currentCell);  break;
        case MOUSE_SELECT_ROW:   SelectRows(currentCell);     break;
        case MOUSE_SELECT_CELLS: SelectCells(currentCell);    break;
    }
}

#ifndef GRIDCONTROL_NO_CLIPBOARD

////////////////////////////////////////////////////////////////////////////////////////
// Clipboard functions

void CGridCtrl::CutSelectedText()
{
    if (!IsEditable())
        return;

    // Clear contents of selected cells.
    for (POSITION pos = m_SelectedCellMap.GetStartPosition(); pos != NULL; )
    {
        DWORD key;
        CCellID cell;
        m_SelectedCellMap.GetNextAssoc(pos, key, (CCellID&)cell);

        if (!IsCellEditable(cell))
            continue;

        CGridCell* pCell = GetCell(cell.row, cell.col);
        if (pCell)
        {
		    SendMessageToParent(cell.row, cell.col, GVN_BEGINLABELEDIT);
            EmptyCell(pCell, cell.row, cell.col);
            SetModified(TRUE, cell.row, cell.col);
		    SendMessageToParent(cell.row, cell.col, GVN_ENDLABELEDIT);
        }
    }
    Invalidate();
}

COleDataSource* CGridCtrl::CopyTextFromGrid()
{
    USES_CONVERSION;

    CCellRange Selection = GetSelectedCellRange();
    if (!IsValid(Selection)) return NULL;

    // Write to shared file (REMEBER: CF_TEXT is ANSI, not UNICODE, so we need to convert)
    CSharedFile sf(GMEM_MOVEABLE|GMEM_DDESHARE|GMEM_ZEROINIT);

    // Get a tab delimited string to copy to cache
    CString str;
    CGridCell *pCell;
    for (int row = Selection.GetMinRow(); row <= Selection.GetMaxRow(); row++) 
    {
        str.Empty();
        for (int col = Selection.GetMinCol(); col <= Selection.GetMaxCol(); col++)
        {
            pCell = GetCell(row,col);
            if (pCell && (pCell->state  & GVIS_SELECTED))
            {
                if (pCell->szText.IsEmpty())
                    str += _T(" ");
                else 
                   str += pCell->szText;
            }
            if (col != Selection.GetMaxCol()) 
                str += _T("\t");
        }
        if (row != Selection.GetMaxRow()) 
            str += _T("\n");

        sf.Write(T2A(str.GetBuffer(1)), str.GetLength());
        str.ReleaseBuffer();
    }

    char c = '\0';
    sf.Write(&c, 1);

    DWORD dwLen = sf.GetLength();
    HGLOBAL hMem = sf.Detach();
    if (!hMem) 
        return NULL;

    hMem = ::GlobalReAlloc(hMem, dwLen, GMEM_MOVEABLE|GMEM_DDESHARE|GMEM_ZEROINIT);
    if (!hMem) 
        return NULL;

    // Cache data
    COleDataSource* pSource = new COleDataSource();
    pSource->CacheGlobalData(CF_TEXT, hMem);

    return pSource;
}

BOOL CGridCtrl::PasteTextToGrid(CCellID cell, COleDataObject* pDataObject)
{
    if (!IsValid(cell) || !IsCellEditable(cell) || !pDataObject->IsDataAvailable(CF_TEXT))
        return FALSE;

    // Get the text from the COleDataObject
    HGLOBAL hmem = pDataObject->GetGlobalData(CF_TEXT);
    CMemFile sf((BYTE*) ::GlobalLock(