How can I validat each character entered by the user in MFC property grid control (CMFCPropertyGridCtrl)

Question

I have been trying to validate and update each character in the properties edit box (CMFCPropertyGridCtrl) which was entered by the user.I searched the MSDN and find function like PushChar() etc. But those methods didn't solve my problem. Basically I need to implement CEdit::OnChar() function for the CMFCPropertyGridCtrl edit boxes.

Is it not possible to override PreTranslateMessage and process the messages for WM_CHAR there? According to the documentation it supports the PTM method: https://msdn.microsoft.com/en-us/library/bb983759.aspx — Andrew Truckle, May 09 '16 at 08:35
`CEdit::OnChar()` is not what you're looking for, nor is its `CMFCPropertyGridCtrl` equivalent. Both would fail to account for input coming from sources other than the keyboard (e.g. a mouse paste operation). You need to respond to change notifications. — IInspectable, May 09 '16 at 09:11
@IInspectable: I think you can't do it via OnChar, even when it comes from keyboard, because it is being overridden by its own `CMFCPropertyGridCtrl::PreTranslateMessage` — sergiol, May 09 '16 at 21:55

score 1 · Answer 1 · answered May 09 '16 at 22:25

1

When you provide lpszEditMask or lpszEditTemplate or lpszValidChars parameters to the constructor of a property, the edit control of that property will be a CMFCMaskedEdit instead of a normal CEdit. You can confirm what I said on CMFCPropertyGridProperty::CreateInPlaceEdit implementation.

So, if I was in your place, I would read CMFCMaskedEdit documentation to know how to input the masking, put a breakpoint on CMFCPropertyGridProperty::CreateInPlaceEdit to see how it behaves when you supply the lpsz... arguments and then would come back here to the page to report how had things gone.

answered May 09 '16 at 22:25

sergiol

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CMFCPropertyGridProperty::CreateInPlaceEdit is working fine for me – Suman Reddy May 17 '16 at 10:20
`CMFCPropertyGridProperty::CreateInPlaceEdit` is a virtual function. Did you override it on a derived class made by you? – sergiol May 18 '16 at 07:40

score 0 · Accepted Answer · answered Jun 06 '16 at 04:32

I am going to give the sample code for this. In CustomProperties.h, Derive a class form CMFCPropertyGridProperty

class CMyEditProp : public CMFCPropertyGridProperty
{
public:
    CMyEditProp (const CString& strName, const CString& strValue, LPCTSTR lpszDescr = NULL, DWORD dwData = 0);

protected:
    virtual CWnd* CreateInPlaceEdit(CRect rectEdit, BOOL& bDefaultFormat);
    virtual CString FormatProperty();
};

Also derive a class from CEdit and implement a OnChar() method in it.

class MyEdit:public CEdit
{
public: 
        void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
        {
          if(!IsCharAlpha(nChar))
            return;

          CEdit::OnChar(nChar, nRepCnt, nFlags);
        }
  DECLARE_MESSAGE_MAP()
};

In CustomProperties.cpp Implement all the methods which were declared in header file.

CMyEditProp ::CPasswordProp(const CString& strName, const CString& strValue, LPCTSTR lpszDescr, DWORD dwData)
: CMFCPropertyGridProperty(strName, (LPCTSTR) strValue, lpszDescr, dwData)
{
}

CWnd* CMyEditProp ::CreateInPlaceEdit(CRect rectEdit, BOOL& bDefaultFormat)
{
    MyEdit pWndEdit;
    DWORD dwStyle = WS_VISIBLE | WS_CHILD | ES_AUTOHSCROLL ;

    if (!m_bEnabled || !m_bAllowEdit)
    {
        dwStyle |= ES_READONLY;
    }

    pWndEdit.Create(dwStyle, rectEdit, m_pWndList, AFX_PROPLIST_ID_INPLACE);


    bDefaultFormat = TRUE;
    return &pWndEdit;
}

BEGIN_MESSAGE_MAP(MyEdit,CEdit)
    ON_WM_CHAR()
END_MESSAGE_MAP()

This will work like as Edit control and you can validate all the characters entered by the user.

How can I validat each character entered by the user in MFC property grid control (CMFCPropertyGridCtrl)

2 Answers2