How to find CStatic (text) bounding rect of actual content? - mfc

Question

When I have a mfc CStatic control, I can read the control's window rect by
CStatic textStatic = GetDlgItem(IDC_TEXT_STATIC);
CRect rect;
textStatic.GetWindowRect(&rect);
ScreenToClient(rect);
However, this gives me the bounding rect of the control independent from the actual displayed text. If the text is longer than this, then the text is truncated, and if the text is shorter than this, it does not give me the 'right border' of the text.
For some dynamic resizing of dialogs, I would like to find the bounding rect (or at least the width) of the actually drawn text, not the control itself.
How do I get to this (programatically)?

Answer 1

You can call CDC::DrawTextEx with the DT_CALCRECT formatting option (see DrawTextEx). An appropriate device context is returned from a call to CWnd::GetDC:
CRect GetTextSize(int ctrlId) {
CWnd* pControl = GetDlgItem(ctrlId);
CString text;
pControl->GetWindowText(text);
CDC* pDC = pControl->GetDC();
CRect textRect;
pDC->DrawTextEx(text, &textRect, DT_CALCRECT, NULL);
return textRect;
}

Answer 2

IInspectable's answer above got me started, but was missing the bit to select the appropriate font (to deal with system font DPI setting). The following method now does what I need:
CRect GetControlTextRect(CWnd *pWnd)
{
CString text;
pWnd->GetWindowText(text);
CDC* pDC = pWnd->GetDC();
CFont* pFont = pWnd->GetParent()->GetFont();
pDC->SelectObject( pFont );
CRect textRect;
pWnd->GetWindowRect(&textRect);
pDC->DrawTextEx(text, &textRect, DT_CALCRECT, NULL);
return textRect;
}
Called f.e. like here:
CWnd * txtCtrl = GetDlgItem(IDC_STATIC); // IDC_STATIC is the resource ID of the control
CRect rect = GetControlTextRect( txtCtrl );
ScreenToClient(rect);
Or alternatively like:
CStatic txtCtrl = GetDlgItem(IDC_STATIC); // IDC_STATIC is the resource ID of the control
CRect rect = GetControlTextRect( &txtCtrl );
ScreenToClient(rect);