Change color of an Edit Box upon Set and Kill Focus.

I want to change the color of an Edit box upon set focus and set back to normal color as the focus killed as my client want so. Hope this tricks will help those beginner who want to change their control color.

 

Here is the process I Have follow

 

1.       Create a MFC Dialog based project.

2.       Add following control on the dialog

3.       Add two Global variable for the background and text color and a Static CBrush.

 

const COLORREF FG_COLOR = RGB(186, 186, 186);

const COLORREF BK_COLOR = RGB(69, 69, 69);

static CBrush bkBrush(BK_COLOR);

 

4.       Add WM_CTLCOLOR member function and add following code.

HBRUSH CColorEditDemoDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)

{

                HBRUSH hbr = CDialogEx::OnCtlColor(pDC, pWnd, nCtlColor);

                if (nCtlColor == CTLCOLOR_EDIT &&

                                pWnd->m_hWnd == ::CWnd::GetFocus()->GetSafeHwnd())

                {

                                pDC->SetBkColor(BK_COLOR);

                                pDC->SetTextColor(FG_COLOR);

                                return bkBrush;

                }

                return hbr;

}

5.       Add Setfocus and KillFocus function on MESSAGE_MAP

BEGIN_MESSAGE_MAP(CColorEditDemoDlg, CDialogEx)

                …

                ON_CONTROL_RANGE(EN_SETFOCUS,0x0,0xFFFFFFFF,OnEditSetFocus)

                ON_CONTROL_RANGE(EN_KILLFOCUS,0x0,0xFFFFFFFF,OnEditKillFocus)

END_MESSAGE_MAP()

6.       Add two member function as on Message map. OnEditSetFocus and OnEditKillFocus.

void CColorEditDemoDlg::OnEditSetFocus(UINT nID)

{

                RepaintIfEdit(GetDlgItem(nID));

}

void CColorEditDemoDlg::OnEditKillFocus(UINT nID)

{

                RepaintIfEdit(GetDlgItem(nID));

}

7.       Add a member function RepaintIfEdit (if the focus control is an edit will be repainted.)

void CColorEditDemoDlg::RepaintIfEdit(CWnd* pWnd)

{

                WCHAR clsName[6] = L"";

                GetClassName(pWnd->GetSafeHwnd(), clsName, 6);

                if (StrCmp(clsName, L"Edit") == 0)

                {

                                pWnd->Invalidate();

                                pWnd->UpdateWindow();

                }

}

 

Compile and Run.

You can have demo here.

You can get a sample project here