Adding "Merge cells" support to the MFC GridControl

• Download demo project - 303 Kb

Introduction

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);

Usage

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

History

• 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.)