Changing color of background of a CEdit control
Quote:
> I have a CEdit control as read-only. I want to change the background color,
> but have only managed to change the background color of the text on the
> control(SetBkColor), but the rest of the control's background continues to
> have the default color. How can I set all the control's background color?
> Jose
Below is the text from an article on the URL below. It may help you.
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How to change the background color in a single edit control
There are instances where you might have multiple edit
controls in a dialog box, but want only one of
the controls to have a different background color. This
article shows how to accomplish that. The
technique applies to other types of controls as well.
This example assumes that you have created a red brush
(m_Brush) at such a place in your code
that the brush will have an adequate lifetime. It is also
assumed that you are responsible for deleting
the brush object and freeing up any memory that the brush
required.
Using Class Wizard, implement a handler for the WM_CTLCOLOR
message in your dialog object.
HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT
nCtlColor)
{
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd,
nCtlColor);
return hbr;
// TODO: Return a different brush if the
default is not desired
// return hbr;
}
Check the value of nCtlColor against CTLCOLOR_EDIT and the
handle of the window pointed to by
pWnd against the handle of the edit control which color you
want to change. The trick is to use the
window handles for the comparison rather than the pointers
because the pointers are temporary -
sometimes too temporary - but the handles are permanent.
HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT
nCtlColor)
{
// get a pointer to the specific edit control which
color you want to control
CEdit * pEdit = (CEdit
*)GetDlgItem(IDC_REDEDIT);
if(nCtlColor == CTLCOLOR_EDIT &&
pEdit->GetSafeHwnd() == pWnd->GetSafeHwnd()) {
// set the back mode so that new background color
shows through the text
pDC->SetBkMode(TRANSPARENT);
// make the text white so that it shows up well over
red
pDC->SetTextColor(RGB(255,255,255));
// return the red brush
return m_Brush;
}
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd,
nCtlColor);
return hbr;
}
This approach will work with edit controls that are
designated as READONLY by comparing nCtlColor
with CTLCOLOR_STATIC rather than CTLCOLOR_EDIT. You should
also set the text back color to
an appropriate color rather than setting the back mode to
TRANSPARENT.
HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT
nCtlColor)
{
// get a handle to the specific READ ONLY edit
control which color you want to control
CEdit * pEditReadOnly = (CEdit
*)GetDlgItem(IDC_READONLYEDIT);
HWND hWndReadOnly =
pEditReadOnly->GetSafeHwnd();
if(nCtlColor == CTLCOLOR_STATIC &&
hWndReadOnly == pWnd->GetSafeHwnd()) {
// set the text back color to the same as the brush
(red)
pDC->SetBkColor(RGB(255,0,0));
// make the text white so that it shows up well over
red
pDC->SetTextColor(RGB(255,255,255));
// return the red brush
return m_Brush;
}
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd,
nCtlColor);
return hbr;
}
///////////////////////
Cecil
--
Cecil Galbraith
Free programmer's utilities and MFC tips at
http://www.concentric.net/~cgalbrai
