gridctrl.cpp

用VC++和access数据库开发的账单管理系统

        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;
            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)
            {
                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;

    // EFW - Bug Fix - Force focus to be in a non-fixed cell
    if(cell.row != -1 && cell.row < GetFixedRowCount())
        cell.row = GetFixedRowCount();
    if(cell.col != -1 && cell.col < GetFixedColumnCount())
        cell.col = GetFixedColumnCount();

    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); // comment to reduce flicker

        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); // comment to reduce flicker

        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);

        // EFW - New addition.  If in list mode, make sure the selected
        // row highlight follows the cursor.
        if(m_bListMode)
        {
            m_PrevSelectedCellMap.RemoveAll();
            m_MouseMode = MOUSE_SELECT_ROW;
            OnSelecting(m_idCurrentCell);

            // Leave this off so that you can still drag the highlight around
            // without selecting rows.
            // m_MouseMode = MOUSE_NOTHING;
        }
    }

    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();

    // EFW - Bug fix - Don't allow selection of fixed rows
    if(nMinRow >= 0 && nMinRow < GetFixedRowCount())
        nMinRow = GetFixedRowCount();
    if(nMaxRow >= 0 && nMaxRow < GetFixedRowCount())
        nMaxRow = GetFixedRowCount();
    if(nMinCol >= 0 && nMinCol < GetFixedColumnCount())
        nMinCol = GetFixedColumnCount();
    if(nMaxCol >= 0 && nMaxCol < GetFixedColumnCount())
        nMaxCol = GetFixedColumnCount();

    // 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
        }
        else
        {
            m_SelectedCellMap.RemoveKey( key);  // if it's not valid, get rid of it!
        }
    }

    // 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() &&
        nMinRow >= 0 && nMinCol >= 0 && nMaxRow >= 0 && nMaxCol >= 0)
    {
        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));
}

// Called when mouse/keyboard selection is a-happening.
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;
    }

    // EFW - Bug fix [REMOVED CJM: this will cause infinite loop in list mode]
    // SetFocusCell(max(currentCell.row, m_nFixedRows), max(currentCell.col, m_nFixedCols));
}

#ifndef GRIDCONTROL_NO_CLIPBOARD

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

// Deletes the contents from the selected cells
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;

        CGridCellBase* pCell = GetCell(cell.row, cell.col);
        if (pCell)
        {
            // don't clear hidden cells
            if( m_arRowHeights[ cell.row] > 0
                && m_arColWidths[cell.col] > 0 )
            {
                SendMessageToParent(cell.row, cell.col, GVN_BEGINLABELEDIT);
                pCell->SetText(_T(""));
                SetModified(TRUE, cell.row, cell.col);
		        SendMessageToParent(cell.row, cell.col, GVN_ENDLABELEDIT);
            }