DrawText Refresh Problem - Text Disappears - c++

Question

I'm using Objective Grid and wanted to have a grid cell control that can show an icon and text. So I took RogueWave's example (https://rwkbp.makekb.com/entry/466/) and modified it as below.
Initially the text renders correctly, but if I do anything in the grid that refreshes the relevant cell, the text disappears. If I update the whole grid, or even refresh the cell by dragging it off screen and back again, the text reappears - until it disappears again. Seems like a paint or InvalidateRect problem - but I can't figure out how to fix it. Any ideas?
Thanks!
//------------------------------------------------------------------------------
void CGXIconControl::Draw(CDC* pDC, CRect rect, ROWCOL nRow, ROWCOL nCol, const CGXStyle& style, const CGXStyle* pStandardStyle)
//------------------------------------------------------------------------------
{
BOOL b;
ASSERT(pDC != NULL && pDC->IsKindOf(RUNTIME_CLASS(CDC)));
// ASSERTION-> Invalid Device Context ->END
ASSERT(nRow <= Grid()->GetRowCount() && nCol <= Grid()->GetColCount());
// ASSERTION-> Cell coordinates out of range ->END
ASSERT_VALID(pDC);
DrawBackground(pDC, rect, style);
pDC->SetBkMode(TRANSPARENT);
if (rect.right <= rect.left || rect.Width() <= 1 || rect.Height() <= 1)
{
return;
}
CString str = style.GetIncludeValue() ? style.GetValue() : _T("");
CString sTxtBefore = _T("");
CString sTxtAfter = _T("");
int nHAlign = style.GetHorizontalAlignment();
int nVAlign = style.GetVerticalAlignment();
// Save these value to restore them when done drawing
COLORREF crOldTextColor = pDC->GetTextColor();
COLORREF crOldBkColor = pDC->GetBkColor();
if (!style.GetEnabled())
{
pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));
}
CBrush Brush;
Brush.CreateSolidBrush(style.GetEnabled() ? ::GetSysColor(COLOR_WINDOWTEXT) : ::GetSysColor(COLOR_GRAYTEXT));
LOGBRUSH lBrush = { 0 };
Brush.GetLogBrush(&lBrush);
CBrush* pOldBrush = (CBrush*)pDC->SelectStockObject(NULL_BRUSH);
CPen linePen;
linePen.CreatePen(PS_SOLID, 1, &lBrush);
CPen* pOldPen = pDC->SelectObject(&linePen);
// Set font bold if necessary
CFont* pCurfont = pDC->GetCurrentFont();
LOGFONT lf;
CFont font;
if (pCurfont)
{
pCurfont->GetLogFont(&lf);
}
if (style.GetFont().GetBold())
{
lf.lfWeight = FW_BOLD;
}
font.CreateFontIndirect(&lf);
CFont* pOldFont = pDC->SelectObject(&font);
int nIcoStart = str.Find(_T("#ICO"));
if (nIcoStart == -1)
{
// We didn't find an icon indicator, so just draw the text
pDC->DrawText(str, rect, DT_SINGLELINE|nHAlign|nVAlign);
}
else
{
sTxtBefore = str.Left(nIcoStart);
CSize szBefore = pDC->GetTextExtent(sTxtBefore);
int nIconEnd = str.Find(_T(")"), nIcoStart);
CString strIDResource = str.Mid(nIcoStart + 5, nIconEnd - (nIcoStart + 5));
UINT nIDResource = _ttoi(strIDResource);
// Load the highest bit-depth available
HICON hIcon = NULL;
hIcon = LoadResourceIcon(nIDResource, m_nIconSize, m_nIconSize, 32);
hIcon == NULL ? LoadResourceIcon(nIDResource, m_nIconSize, m_nIconSize, 24) : NULL;
hIcon == NULL ? LoadResourceIcon(nIDResource, m_nIconSize, m_nIconSize, 16) : NULL;
hIcon == NULL ? LoadResourceIcon(nIDResource, m_nIconSize, m_nIconSize, 8) : NULL;
sTxtAfter = str.Right(str.GetLength() - nIconEnd - 1);
CSize szAfter = pDC->GetTextExtent(sTxtAfter);
CRect rectCell = CGXControl::GetCellRect(nRow, nCol, rect, &style);
CRect rectBefore = rectCell;
CRect rectAfter = rectCell;
int nTotalWidth = szBefore.cx + m_nIconSize + szAfter.cx;
// Calculate positions
int nTop, nLeft;
switch (nHAlign)
{
case DT_LEFT:
{
rectBefore.right = rectBefore.left + szBefore.cx;
nLeft = rectBefore.right;
rectAfter.left = nLeft + m_nIconSize;
rectAfter.right = rectAfter.left + szAfter.cx;
} break;
case DT_CENTER:
{
rectBefore.left = (rectCell.right - rectCell.Width() / 2) - nTotalWidth / 2;
rectBefore.right = rectBefore.left + szBefore.cx;
nLeft = rectBefore.right;
rectAfter.left = nLeft + m_nIconSize;
rectAfter.right = rectAfter.left + szAfter.cx;
} break;
case DT_RIGHT:
{
// Work from the right
rectAfter.right = rectCell.right;
rectAfter.left = rectAfter.right - szAfter.cx;
nLeft = rectAfter.left - m_nIconSize;
rectBefore.right = nLeft;
rectBefore.left = rectBefore.right - szBefore.cx;
} break;
}
switch (nVAlign)
{
case DT_TOP:
nTop = rectCell.top;
break;
case DT_VCENTER:
nTop = rectCell.top + (rectCell.Height() / 2 - m_nIconSize / 2);
break;
case DT_BOTTOM:
nTop = rectCell.bottom - m_nIconSize;
break;
}
if (!sTxtBefore.IsEmpty())
{
pDC->DrawText(sTxtBefore, rectBefore, DT_SINGLELINE|nHAlign|nVAlign);
}
b = ::DrawIconEx(pDC->m_hDC, nLeft, nTop, hIcon, m_nIconSize, m_nIconSize, 0, NULL, DI_NORMAL);
b = ::DestroyIcon(hIcon);
if (!sTxtAfter.IsEmpty())
{
pDC->DrawText(sTxtAfter, rectAfter, DT_SINGLELINE|nHAlign|nVAlign);
}
}
// Reset original values
pDC->SetTextColor(crOldTextColor);
pDC->SetBkColor(crOldBkColor);
pDC->SelectObject(pOldBrush);
pDC->SelectObject(pOldPen);
pDC->SelectObject(pOldFont);
// Child Controls: spin-buttons, hotspot, combobox btn, ...
CGXControl::Draw(pDC, rect, nRow, nCol, style, pStandardStyle);
}