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Problem
How can I display selected cells with a user-defined text and background color or use the highlight text and background color from the system settings?
Cause
Action
By default Objective Grid is only inverting selected cells with CDC::InvertRect(), but by overriding the following two methods, you will be able to change the appearance of selected cells.
Please note that in earlier versions of this article we mentioned to set m_bCacheCurrentCell = FALSE. This was wrong. Instead you should set m_bRefreshOnSetCurrentCell = TRUE; This also solves the problem that this solution did not work with listbox mode.
Example:
In your OnInitialUpdate() routine, you should change the following attribute:
| // Force that current cell is redrawn when user // navigates through the grid m_bRefreshOnSetCurrentCell = TRUE; |
Next, you should override the following two methods:
| BOOL CGridSampleView::GetStyleRowCol(ROWCOL nRow, ROWCOL nCol, CGXStyle& style, GXModifyType mt, int nType) { |
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| // Load stored style information of the cell BOOL bRet = CGXGridCore::GetStyleRowCol(nRow, nCol, style, mt, nType); // Check invert state for individual cell |
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| style.SetInterior(::GetSysColor(COLOR_HIGHLIGHT)); style.SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT)); bRet = TRUE; |
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| }
return bRet; |
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| }
void CGridSampleView::DrawInvertCell(CDC* /*pDC*/, ROWCOL nRow, ROWCOL nCol, CRect rectItem) |
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| // If DrawInvertCell has been called // from OnDrawTopLeftBottomRight // m_nNestedDraw is greater 0. There // is no invalidation of the rectangle // necessary because the cell has // already been drawn. if (m_nNestedDraw == 0) { |
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| // m_nNestedDraw equal to 0 means // that PrepareChangeSelection, // PrepareClearSelection or // UpdateSelectRange did call // this method. CGXRange range; if (GetCoveredCellsRowCol(nRow, nCol, range)) |
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| rectItem = CalcRectFromRowCol(range.top, range.left, range.bottom, range.right); | ||||
| InvalidateRect(&rectItem); | ||||
| } | ||||
| } | ||||
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| Objective Grid: Unselecting rows with the mouse | Objective Grid: Preventing the user from selecting multiple rows |
