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How to change the back color of an edit box when it gets the focus

, 10 Jun 2001
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Change the back color of an edit box to yellow when it gets the focus, and back to white when it loses the focus.

Sample Image - CEditBkColor.gif

Introduction

This article shows how to change the back color of an edit box when it gets the focus.

  1. Derive a class from the standard edit control class, CEdit.
  2. Add 3 private variables:
    • A COLORREF to store the current back color
    • A CBrush to store the brush used to paint the back color of the edit control
    • A CString to store the current contents of the edit box
  3. Override the virtual OnChildNotify function.
    BOOL CMyEdit::OnChildNotify(UINT message, 
        WPARAM wParam, LPARAM lParam, LRESULT* pLResult)
    {
        // We only want to handle WM_CTLCOLOREDIT messages - 32 bit only
        if (message != WM_CTLCOLOREDIT) 
        {
            return CEdit::OnChildNotify(message, wParam, lParam, pLResult);
        }
        HDC hdcChild = (HDC)wParam;
        // Text is black – you can modify this by adding
        // another variable for text color
        SetTextColor(hdcChild, RGB(0,0,0));
        SetBkColor(hdcChild, m_BackColor);
        return TRUE;
    }
  4. Add message handlers to handle the following Windows messages:
    • ON_WM_SETFOCUS
    • ON_WM_KILLFOCUS
    • ON_WM_PAINT
    void CMyEdit::OnSetFocus(CWnd* pOldWnd)
    {
        CEdit::OnSetFocus(pOldWnd);
    
        m_BackColor = RGB(255,255,0);
        Invalidate(FALSE);
    }
    
    void CMyEdit::OnKillFocus(CWnd* pNewWnd)
    {
        CEdit::OnKillFocus(pNewWnd);
        // I am setting normal back color to white
        // – you can modify this as you see fit
        m_BackColor = RGB(255,255,255);
        // Force a repaint
        Invalidate(FALSE);
    }
    void CMyEdit::OnPaint()
    {
        CPaintDC dc(this); // device context for painting
    
        // TODO: Add your message handler code here
        GetWindowText(m_Text);
        SetBkGrndColor();
    
        // Do not call CEdit::OnPaint() for painting messages
    }
    
  5. Add a private member function SetBkGrndColor()
    void CMyEdit::SetBkGrndColor()
    {
        // Delete the old brush
        m_Brush.DeleteObject();
        // Create a new brush in the specified color
        m_Brush.CreateSolidBrush(m_BackColor);
        CDC* pDC = GetDC();
        pDC->SetBkMode(OPAQUE);
        pDC->SetBkColor(m_BackColor);
        // Select the brush into this window’s device context
        pDC->SelectObject(&m_Brush);
        CRect rc;
        // Get the client area of the edit control
        GetClientRect(&rc);
        ScreenToClient(&rc);
        // Apply the device context to the client area of the edit control
        pDC->Rectangle(0, 0, rc.Width(), rc.Height());
        // Rewrite the text since the backcolor paint
        // overwrote the existing text
        pDC->SetTextColor(RGB(0, 0, 0,));
        pDC->TextOut(2, 2, m_Text.GetBuffer(m_Text.GetLength()));
    }

License

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

Warren J. Hebert
Web Developer
United States United States
I am a Visual Basic, Visual C++ programmer (consultant) with 6 years experience. I am also an instructor and have been teaching Visual Basic and Visual C++ at a local community college for the past 15 months.

Comments and Discussions

 
Generalin my opinion... PinmemberCho,Dae-Wan27-Mar-04 7:46 
Questionhow to change the color of an edit box Pinmemberbhanusiva29-Jan-04 6:04 
AnswerRe: how to change the color of an edit box Pinmemberihoapm23-Dec-04 20:36 
GeneralSeems to work without CMyEdit::OnPaint Pinmemberchris10916-Dec-03 23:55 
GeneralThis article is just cut-n-paste from MSDN Q132080 Pinmemberip30-Oct-03 21:05 
GeneralRe: This article is just cut-n-paste from MSDN Q132080 PinmemberDean Bathke4-Feb-05 18:19 
GeneralChanging the Selection Color within the control PinmemberChandra Birusumanti12-Aug-03 8:47 
GeneralQuestion about CEdit PinmemberAlex Bikov1-Feb-02 8:46 
GeneralProblems PinmemberChristian Graus11-Nov-01 13:28 
GeneralRe: Problems PinmemberJames R. Twine4-Jan-02 8:16 
GeneralRe: Problems PinmemberChristian Graus4-Jan-02 10:50 
GeneralRe: Problems PinmemberJames R. Twine4-Jan-02 11:01 
GeneralRe: Problems PinmemberChristian Graus4-Jan-02 11:10 
GeneralRe: Problems TN062 Pinmemberosy8-Apr-03 1:28 
GeneralMore options PinmemberKant16-Jun-01 9:05 

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