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CRichEditctrl-SetDefaultCharFormat

abc abc 351 Reputation points
2020-09-17T13:43:43.257+00:00

Hi,

I added my own format embed text(%###%) in the cricheditctrl without typing by calling replacesel() at zeroth position. For embed text I am using green color.After adding embed text if I type characters from zeroth position, I am getting green color characters only I want to have default charformat of CRichEditctrl which is black color whereas if I type after embed text that is from 5th position I am getting black color.

How to get black color at zeroth position? If the character is non embed text I need to use default charformat(black color). How to achieve this?

C++
C++
A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
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  1. RLWA32 43,046 Reputation points
    2020-09-18T17:16:27.473+00:00

    The standard behavior of the rich edit control when text is inserted is to apply the character formatting that is in effect at the insertion point. That is why after setting the color of the custom format text to green in OnInitDialog typing text at position 0 receives the green color. Following example sets the custom format text as protected and then uses the EN_PROTECTED handler to process inserted text at position 0 (or elsewhere). I didn't try to code the example to handle all possibilities.

    In OnInitDialog

        m_richeditctrl.SetEventMask(m_richeditctrl.GetEventMask() | ENM_PROTECTED);
    CHARFORMAT cfm{ sizeof cfm };
    m_richeditctrl.ReplaceSel(_T("%###%"));
    cfm.dwMask = CFM_COLOR | CFM_PROTECTED;
    cfm.dwEffects = CFE_PROTECTED;
    cfm.crTextColor = RGB(0, 255, 0);
    m_richeditctrl.SetSel(0, 5);
    m_richeditctrl.SetSelectionCharFormat(cfm); // set custom format text to green and make protected

    In EN_PROTECTED handler -

        LRESULT lres = 0;
    ENPROTECTED *pEnProtected = reinterpret_cast<ENPROTECTED *>(pNMHDR);
    // TODO:  The control will not send this notification unless you override the
    // CDialogEx::OnInitDialog() function to send the EM_SETEVENTMASK message
    // to the control with the ENM_PROTECTED flag ORed into the lParam mask.

    // TODO:  Add your control notification handler code here
    TRACE(_T("Msg 0x%X, start %d, end %d\n"), pEnProtected->msg, pEnProtected->chrg.cpMin, pEnProtected->chrg.cpMax);
    if (pEnProtected->msg == WM_CHAR)
    {
        CHARRANGE cr = pEnProtected->chrg;       
        CHARFORMAT cfDefault{ sizeof cfDefault };
        m_richeditctrl.GetDefaultCharFormat(cfDefault);
        bool bInsertionpoint = true;

        if (cr.cpMin == cr.cpMax)
            ++cr.cpMax;
        else
            bInsertionpoint = false;

        CString str;
        m_richeditctrl.GetTextRange(cr.cpMin, cr.cpMax, str);
        if ((pEnProtected->chrg.cpMin == 0 && bInsertionpoint) || str.FindOneOf(_T("%#")) == -1) // 
        {
            m_richeditctrl.SetSel(pEnProtected->chrg);
            m_richeditctrl.SetSelectionCharFormat(cfDefault);
            TRACE(_T("Default format applied\n"));
        }
        else
        {
            TRACE(_T("Change not allowed\n"));
            lres = 1;
        }
    }

    *pResult = lres;
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