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Adding "Merge cells" support to the MFC GridControl

, 29 Dec 2002
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Adding "Merge cells" support to the MFC GridControl.

Sample Image - gridcontrl.jpg

Sample Image - print.jpg


This example demonstrates how to add "merge cells" ability to Chris Maunder's MFC Grid control (derived from CWnd).

The example modifies only two classes: CGridCellBase and CGridCtrl. In the class CGridCellBase ,the following four private member variables are added:

CCellRange m_MergeRange;
bool m_IsMergeWithOthers;
CCellID m_MergeCellID;
bool m_Hide;

Six public member functions are also added:

void UnMerge();
virtual bool IsShow() ;
virtual CCellRange GetMergeRange();
virtual bool IsMergeWithOthers();
virtual CCellID GetMergeCellID();
virtual void SetMergeCellID(CCellID cell);

In the class CGridCtrl, the following six public member functions are added:

CGridCellBase* GetCell(CCellID cell);
CCellID GetMergeCellID(CCellID cell);
void UnMergeSelectedCells();
void MergeSelectedCells();
void UnMergeCells(int nStartRow, int nStartCol, int nEndRow, int nEndCol);
void MergeCells(int nStartRow, int nStartCol, int nEndRow, int nEndCol);


  • Use CGridCtrl::MergeSelectedCells() and MergeCells() to merge the selected cells;
  • Use CGridCtrl::UnMergeSelectedCells() and UnMergeCells() to restore the selected cell to its original state.


  • 1.7 fixed the bug when merging in the corner, by Luther Bruck - 2002/12/31
  • 1.6 fixed the bug when resizing the merged row - 2002/11/20
  • 1.5 fixed the bug when resizing the merged column - 2002/11/18
  • 1.4 bug when printing merge cell across pages fixed - 2002/10/10
  • 1.3 fixed cells merge added - 2002/9/27
  • 1.2 print bug fixed - 2002/9/23
  • 1.1 scroll bug fixed - 2002/9/18
  • 1.0 first release - 2002/9/15

(Note that users of the Grid control are bound by Chris' copyright requirements detailed on his web page.)


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Huang Wei
Web Developer
China China
He got Master degree of Theory and Application of Automatic Control from Tsinghua university(Beijing,China) in 1997,from then on he has been working for Tsinghua TongFang Software Co.Ltd,Beijing China.

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Comments and Discussions

BugMergeCell Sort Pin
Member 1038662910-Feb-15 18:38
memberMember 1038662910-Feb-15 18:38 
GeneralMy vote of 5 Pin
Faint789020-Apr-13 22:01
memberFaint789020-Apr-13 22:01 
Questionset color of tool bar button text Pin
Uday P.Singh16-Feb-12 1:57
memberUday P.Singh16-Feb-12 1:57 
GeneralDrawing issue in merging cell Pin
Member 304756327-May-11 3:19
memberMember 304756327-May-11 3:19 
GeneralSetItemBkColour function will make grid line disappear Pin
zhuguo30-Jun-09 1:06
memberzhuguo30-Jun-09 1:06 
GeneralMerged cell disapears while sorting Pin
TanmaySathe17-Feb-09 18:14
memberTanmaySathe17-Feb-09 18:14 
QuestionHow can i generate a DLL and an OCX file for this code in your attachment? Pin
praveen_sap25-Jan-09 11:55
memberpraveen_sap25-Jan-09 11:55 
General[Message Removed] Pin
immetoz6-Oct-08 7:55
memberimmetoz6-Oct-08 7:55 
Questionunable to download the attachment file Pin
G Haranadh30-Jul-08 2:48
memberG Haranadh30-Jul-08 2:48 
Generalprint probs Pin
zhkingsmac7-Jul-08 16:35
memberzhkingsmac7-Jul-08 16:35 
Generalin virtual mode, merge cells function doesn't work properly Pin
Member 46478006-Mar-08 21:02
memberMember 46478006-Mar-08 21:02 
QuestionPrintCell is wrong Pin
andrewtruckle5-Aug-07 20:06
memberandrewtruckle5-Aug-07 20:06 
AnswerRe: PrintCell is wrong Pin
andrewtruckle5-Aug-07 22:01
memberandrewtruckle5-Aug-07 22:01 
QuestionHow to save the merged grid infomation?? Pin
hhuwangzhp198026-Jun-07 18:01
memberhhuwangzhp198026-Jun-07 18:01 
GeneralAdding a BITMAP Pin
hodeck~10-Sep-06 20:08
memberhodeck~10-Sep-06 20:08 
QuestionHas anyone got this working properly in v2.26 ? Pin
jfougero4-Sep-06 17:05
memberjfougero4-Sep-06 17:05 
AnswerRe: Has anyone got this working properly in v2.26 ? Pin
hamo200827-Nov-06 20:05
memberhamo200827-Nov-06 20:05 
AnswerRe: Has anyone got this working properly in v2.26 ? Pin
Member 382164026-Jun-08 23:56
memberMember 382164026-Jun-08 23:56 
Generalbug: Merge the merged cells --fixed Pin
hamo200826-Jul-06 5:40
memberhamo200826-Jul-06 5:40 
GeneralRe: bug: Merge the merged cells --fixed Pin
cuiting9-Dec-12 22:18
membercuiting9-Dec-12 22:18 
GeneralProblem deleting rows Pin
andrewtruckle8-Jun-06 1:39
memberandrewtruckle8-Jun-06 1:39 
GeneralRe: Problem deleting rows Pin
andrewtruckle8-Jun-06 3:53
memberandrewtruckle8-Jun-06 3:53 
GeneralRe: Problem deleting rows - FIXED! Pin
andrewtruckle9-Jun-06 3:01
memberandrewtruckle9-Jun-06 3:01 
GeneralAutoSizeColumn problem Pin
andrewtruckle24-May-06 21:04
memberandrewtruckle24-May-06 21:04 
GeneralClicking on a merged cell and moving by keyboard to merged cell Pin
andrewtruckle23-May-06 21:49
memberandrewtruckle23-May-06 21:49 
GeneralRe: Clicking on a merged cell and moving by keyboard to merged cell - Solution Pin
andrewtruckle23-May-06 23:24
memberandrewtruckle23-May-06 23:24 
GeneralAdd MergeCell function with CGridCtrl2.25 Pin
MajorVon11-Aug-05 22:09
memberMajorVon11-Aug-05 22:09 
GeneralRe: Add MergeCell function with CGridCtrl2.25 Pin
andrew.truckle@atkinsglobal.com19-Sep-05 0:42
memberandrew.truckle@atkinsglobal.com19-Sep-05 0:42 
Questionautosize merged cells? Pin
markoot28-Jul-05 10:19
membermarkoot28-Jul-05 10:19 
GeneralI fixed the bug that it can't show the last line of grid. Pin
victor_zhao10-Jul-05 22:07
membervictor_zhao10-Jul-05 22:07 
Generalcannot downlaod the demo Pin
manjuvk9-Apr-05 19:35
membermanjuvk9-Apr-05 19:35 
GeneralVirtual Mode Pin
TimPreuss5-Jan-05 2:32
memberTimPreuss5-Jan-05 2:32 
Generalword wrapping Pin
andrew.truckle@atkinsglobal.com7-Oct-04 3:47
memberandrew.truckle@atkinsglobal.com7-Oct-04 3:47 
GeneralRe: word wrapping Pin
Ice137421-May-06 5:45
memberIce137421-May-06 5:45 
GeneralRe: word wrapping Pin
andrewtruckle21-May-06 8:14
memberandrewtruckle21-May-06 8:14 
QuestionCan I have Tree Cells and merged cells on the same grid Pin
Rafael Melo13-Sep-04 9:45
sussRafael Melo13-Sep-04 9:45 
QuestionHow to print MFC GridControl ? Pin
lzs14-Aug-04 17:10
memberlzs14-Aug-04 17:10 
GeneralI can't download the source files. Pin
TommyChoi18-Jun-04 18:59
sussTommyChoi18-Jun-04 18:59 
General2.25version Pin
Darter27-Apr-04 1:24
memberDarter27-Apr-04 1:24 
GeneralRe: 2.25version Pin
igrzalja30-Aug-04 4:33
memberigrzalja30-Aug-04 4:33 
GeneralRe: 2.25version Pin
andrew.truckle@atkinsglobal.com19-Sep-05 0:46
memberandrew.truckle@atkinsglobal.com19-Sep-05 0:46 
GeneralRe: 2.25version Pin
qz_yc_kj13-Nov-05 3:37
memberqz_yc_kj13-Nov-05 3:37 
GeneralRe: 2.25version Pin
homerhuang21-Feb-06 17:42
memberhomerhuang21-Feb-06 17:42 
GeneralRe: 2.25version Pin
mikewolfli25-Apr-06 22:32
membermikewolfli25-Apr-06 22:32 
GeneralProblem with Scrolling Pin
JIJESH.G1-Mar-04 1:16
memberJIJESH.G1-Mar-04 1:16 
GeneralRe: Problem with Scrolling Pin
Kiato L.6-Aug-04 1:49
sussKiato L.6-Aug-04 1:49 
I had the same problem when I scrolled verticaly. The two bugs are identical so what I have done for my problem can be easily adapted for yours.

In the GridCtrl.cpp file, search for the OnDraw function. Then inside of this function, we have a part commented as :
// draw rest of non-fixed cells"

Inside this block of code, begining with
rect.bottom = nFixedRowHeight-1;
for (row = minVisibleRow; row <= maxVisibleRow; row++)

You will find the following line :

Replace it by :
if(!pCell->IsMergeWithOthers() || row == minVisibleRow )

One of the next lines is :
pCell->Draw(pDC, row, col, rect, FALSE);

Replace it by :
if( row == minVisibleRow && pCell->IsMergeWithOthers())
pCell->KLDraw(pDC, row, col, rect, FALSE);
pCell->Draw(pDC, row, col, rect, FALSE);

Where KLDraw is exactly the same as the Draw function but without the lines :
if(m_Hide && !IsMerged())
return TRUE;

That works for me and solve my problem with the vertical scroll and the resize of the grid.

Minimum changes should be made to solve the same problem with the horizontal croll.
GeneralProblem with printing merging cells in fixed columns Pin
wlegierski2-Dec-03 1:29
memberwlegierski2-Dec-03 1:29 
GeneralRe: Problem with printing merging cells in fixed columns Pin
yuhonggang27-Nov-04 5:02
memberyuhonggang27-Nov-04 5:02 
GeneralRe: Problem with printing merging cells in fixed columns Pin
Cui Sheng14-Feb-05 22:15
memberCui Sheng14-Feb-05 22:15 
GeneralProblem when changing cell colors Pin
JAlcant12327-Oct-03 12:30
memberJAlcant12327-Oct-03 12:30 

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