A focus-sensitive EditBox Class

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• Download demo project - 38 Kb

Introduction

I wanted a focus-sensitive Editbox to make my GUI program more attractive. I found one in codetools, which was distributed by Warren J. Hebert. However I downloaded it and found it worked perfectly only when the Editbox is single line style. But my application wants the EditBox to be a multi-line .So I wrote one! This is CEditEx with the features below:

• Change the back color of an edit box when it gets the focus, and back when it loses the focus.
• Use the flat scroll bar instead of the default behavior.

The Implemention of this class:

The following snippets are used to track to mouse

CEditEx::OnMouseMove(UINT nFlags, CPoint point)
{
    CEdit::OnMouseMove(nFlags, point);

    if (m_bIsFocused)
        return;

    if (GetCapture() != this)
    {
        // come in for the first time

        m_bMouseOver = TRUE;
        SetCapture();
        Invalidate(TRUE);
    }
    else
    {
        CRect rect;

        GetClientRect(&rect);

        if (!rect.PtInRect(point))
        {
            //Mouse move out of Edit control

            m_bMouseOver = FALSE;
            Invalidate(TRUE);
            ReleaseCapture();
        }
    }
}

void CEditEx::OnSetFocus(CWnd* pOldWnd) 
{
    CEdit::OnSetFocus(pOldWnd);

    m_bMouseOver=TRUE;
    Invalidate(TRUE);
}

void CEditEx::OnKillFocus(CWnd* pNewWnd)
{
    CEdit::OnKillFocus(pNewWnd);

    m_bMouseOver=FALSE;
    Invalidate(TRUE);
}

Change the scrollbar appearance
// In the Message map

ON_CONTROL_REFLECT(EN_VSCROLL, OnVscroll)

void CEditEx::OnVscroll()
{
    InitializeFlatSB(GetSafeHwnd());
    // Use the flat scrollbar feature provided by Microsoft.

    // See MSDN for this API

}

//Change the background color of EditBox according to different contex.

// In the Message map

ON_WM_CTLCOLOR_REFLECT()

CEditEx::CEditEx()
{
    m_bMouseOver = FALSE;
    brHot.CreateSolidBrush(RGB(255, 255, 255));
    br.CreateSolidBrush(RGB(221, 221, 221));
}

HBRUSH CEditEx::CtlColor(CDC* pDC, UINT nCtlColor)
{
    if (m_bMouseOver)
    {
        pDC->SetBkColor(RGB(255, 255, 255));
        return brHot;
    }
    else
    {
        pDC->SetBkColor(RGB(221, 221, 221));
        return br;
    }
}

To use the CEditEx class, you should do as follows:

• Add an EditBox into your application. Change the style to be multi-line, No border, Want Return, Vertical Scrollbar.
• In your application add a member variable derived from CEditEx. See, for example testDlg.cpp:

CEditEx m_ctlEdit1;

Points of Interest

Now I'm a senior student of WuHan university in China. I program with MFC, TCP/IP, PHP, javascript, C, HTML and I am also interested in Network Security,DirectX etc.