Microsoft KB Archive/196833

= EditGrid.exe: Edit Cells in MSFlexGrid ActiveX Control =

Article ID: 196833

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 5.0 Enterprise Edition

 Microsoft Visual C++ 5.0 Professional Edition 

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This article was previously published under Q196833



SUMMARY
The Microsoft Flex Grid Control (MSFlexGrid), which ships with Visual C++ and Visual Basic, does not support editing of individual cells.

The Visual Basic Programmer's Guide has an example that shows how to programmatically add this functionality by placing a TextBox control over the cell to be edited, and then updating the cell programmatically.

EditGrid.exe is a sample that shows the steps needed to implement this feature in Microsoft Visual C++ using MFC.



MORE INFORMATION
The following files are available for download from the Microsoft Download Center:

EditGrid.exe

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

NOTE: Use the -d option when running EditGrid.exe to decompress the file and recreate the proper directory structure.

Steps to Add Editing Support to MSFlexGrid
 Use the Component Gallery to add the MSFlexGrid to your project. This creates MFC based wrapper classes for the control.</li> Use ClassWizard to create a new generic CWnd-derived class named CEditGrid. After you create this class, change it so it is derived from the MSFlexGrid class. See the REFERENCES section of this article for more information.</li>  Use ClassWizard to create a new CEdit-derived class named CEditWnd. Handle the WM_CHAR and WM_KEYDOWN messages: void CEditWnd::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) {        if (nChar != 13) // Ignore ENTER key. CEdit::OnChar(nChar, nRepCnt, nFlags); }

void CEditWnd::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) {        if (nChar == 27) // Esc means "Cancel". {           SetWindowText(""); ShowWindow(SW_HIDE); GetParent->SetFocus; }        else if (nChar == 13)  // Enter means "OK". GetParent->SetFocus;

CEdit::OnKeyDown(nChar, nRepCnt, nFlags); }                   </li>  Add the following member variables to CEditGrid: public: CEditWnd m_edit; long m_lBorderWidth; long m_lBorderHeight;

int m_nLogX; int m_nLogY; </li>  Override the PreSubclassWindow virtual function for CEditGrid: void CEditGrid::PreSubclassWindow {        // Calculate border size. SetRow(0); SetCol(0); m_lBorderWidth = GetCellLeft; m_lBorderHeigth = GetCellTop;

// To convert grid rect from twips to DC units you need // pixels per inch. CDC* pDC = GetDC; m_nLogX = pDC->GetDeviceCaps(LOGPIXELSX); m_nLogY = pDC->GetDeviceCaps(LOGPIXELSY); ReleaseDC(pDC);

// Create invisible edit control. m_edit.Create(WS_CHILD|ES_MULTILINE|ES_WANTRETURN,           CRect(0,0,0,0), this, GetDlgCtrlID); }                   </li>  Handle the KeyPress, DBLClick, and LeaveCell reflected events in CEditGrid. To do this, you need to add an event map to the class: EditGrid.h

protected: afx_msg void OnKeyPressGrid(short FAR* KeyAscii); afx_msg void OnDblClickGrid; afx_msg void OnUpdateGrid; DECLARE_EVENTSINK_MAP

EdtGrid.cpp

BEGIN_EVENTSINK_MAP(CEditGrid, CMSFlexGrid) // AFX_EVENTSINK_MAP ON_EVENT_REFLECT(CEditGrid, -603 /* KeyPress */, OnKeyPressGrid,                         VTS_PI2) ON_EVENT_REFLECT(CEditGrid, -601 /* DblClick */, OnDblClickGrid,                         VTS_NONE) ON_EVENT_REFLECT(CEditGrid, 72 /* LeaveCell */, OnUpdateGrid,                         VTS_NONE) END_EVENTSINK_MAP

void CEditGrid::OnDblClickGrid {        short i = 13; OnKeyPressGrid(&i); // Simulate a return. }

void CEditGrid::OnKeyPressGrid(short FAR* KeyAscii) {

ASSERT (KeyAscii != NULL);

m_edit.SetWindowText(GetText);

if (*KeyAscii == 13) m_edit.SetSel(0,-1); else {           char buf[] = " "; buf[0] = (char)*KeyAscii; m_edit.SetSel(-1,-1); m_edit.ReplaceSel(buf); }

// Adjust for border height and convert from twips to screen // units. m_edit.MoveWindow(((GetCellLeft - m_lBorderWidth) * m_nLogX)/1440,           ((GetCellTop - m_lBorderHeight) * m_nLogY)/1440,            (GetCellWidth* m_nLogX)/1440,            (GetCellHeight* m_nLogY)/1440, FALSE);

m_edit.ShowWindow(SW_SHOW); m_edit.SetFocus; }

void CEditGrid::OnUpdateGrid {        // Check to see if edit is visible. BOOL bVisible = ::GetWindowLong(m_edit.GetSafeHwnd, GWL_STYLE) & WS_VISIBLE; if (bVisible) {           CString cStr; m_edit.GetWindowText(cStr); SetText(cStr); m_edit.SetWindowText(""); m_edit.ShowWindow(SW_HIDE); }     }                    </li>  Handle the WM_GETDLGCODE and WM_SETFOCUS messages in CEditGrid: UINT CEditGrid::OnGetDlgCode {     return DLGC_WANTALLKEYS; }

void CEditGrid::OnSetFocus(CWnd* pOldWnd) {     CMSFlexGrid::OnSetFocus(pOldWnd);

OnUpdateGrid; }                   </li> Create an instance of the CEditGrid control in either of the following ways:  Add the MSFlexGrid control to a dialog box or CFormView using the Resource Editor. You can then subclass the control by holding down the CTRL key and double-clicking on the control in the Resource Editor. You must edit the .h file, and change the class from CMSFlexGrid to CEditGrid.

</li> Create the control dynamically. To do this, you need to override the CEditGrid::Create functions to call CMSFlexGrid::Create. You also need to call CEditGrid::SubClassWindow to subclass it. For more information, see the REFERENCES section of this article.</li></ul>

</li>  Set the following properties for the control: <pre class="fixed_text">     Cols = 6 Rows = 20 FillStyle = 1 - Repeat FocusRect = 2 - Heavy </li></ol>

If you add the control to a dialog box or CFormView, you can use the Resource Editor. Otherwise, you need to do this programmatically after you create and subclass the control.

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