void CPropTreeList::OnPaint()
{
CPaintDC dc(this);
CDC memdc;
CBitmap* pOldBitmap;
ASSERT(m_pProp!=NULL);
m_pProp->ClearVisibleList();
memdc.CreateCompatibleDC(&dc);
pOldBitmap = memdc.SelectObject(&m_BackBuffer);
CRect rc;
GetClientRect(rc);
// draw control background
memdc.SelectObject(GetSysColorBrush(COLOR_BTNFACE));
memdc.PatBlt(rc.left, rc.top, rc.Width(), rc.Height(), PATCOPY);
// draw control inside fill color
rc.DeflateRect(2,2);
memdc.PatBlt(rc.left, rc.top, rc.Width(), rc.Height(), m_pProp->IsWindowEnabled() ? WHITENESS : PATCOPY);
rc.InflateRect(2,2);
// draw expand column
memdc.SelectObject(GetSysColorBrush(COLOR_BTNFACE));
memdc.PatBlt(0, 0, PROPTREEITEM_EXPANDCOLUMN, rc.Height(), PATCOPY);
// draw edge
memdc.DrawEdge(&rc, BDR_SUNKENOUTER, BF_RECT);
CPropTreeItem* pItem;
LONG nTotal = 0;
ASSERT(m_pProp->GetRootItem()!=NULL);
rc.DeflateRect(2,2);
// create clip region
HRGN hRgn = CreateRectRgn(rc.left, rc.top, rc.right, rc.bottom);
SelectClipRgn(memdc.m_hDC, hRgn);
// draw all items
for (pItem = m_pProp->GetRootItem()->GetChild(); pItem; pItem = pItem->GetSibling())
{
LONG nHeight = pItem->DrawItem(&memdc, rc, 0, nTotal);
nTotal += nHeight;
}
// remove clip region
SelectClipRgn(memdc.m_hDC, NULL);
DeleteObject(hRgn);
// copy back buffer to the display
dc.GetClipBox(&rc);
dc.BitBlt(rc.left, rc.top, rc.Width(), rc.Height(), &memdc, rc.left, rc.top, SRCCOPY);
memdc.DeleteDC();
}
