想前辈请教一个自绘的问题

alionx 2003-10-20 07:18:34

晚辈在项目中派生了一个CEXHEADERCTRL的子类,并重画了控件的边框
是之呈现平面的效果这一步是做到了,但加入HEADERCTRL的COLUMN的标题却无论如何都不显示,下面是我的代码,基本是抄CJLIB里的CJFLATHEADERCTRL的,请前辈们指点
void CExHeaderCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC dc;
dc.Attach(lpDrawItemStruct->hDC);

// Get the column rect
CRect rcLabel(lpDrawItemStruct->rcItem);

// Save DC
int nSavedDC = dc.SaveDC();

// Set clipping region to limit drawing within column
CRgn rgn;
rgn.CreateRectRgnIndirect(&rcLabel);
dc.SelectObject(&rgn);
rgn.DeleteObject();

// Draw the background
COLORREF clr = ::GetSysColor(COLOR_3DFACE);
CBrush brush(clr);
dc.FillRect(rcLabel, &brush);
dc.SetBkMode(TRANSPARENT);

// Get the column text and format
TCHAR buf[256];
HD_ITEM hditem;

hditem.mask = HDI_TEXT | HDI_FORMAT;
hditem.pszText = buf;
hditem.cchTextMax = 255;

GetItem(lpDrawItemStruct->itemID, &hditem);

// Determine format for drawing column label
UINT uFormat = DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP
| DT_VCENTER | DT_END_ELLIPSIS ;

if(hditem.fmt & HDF_CENTER)
uFormat |= DT_CENTER;
else if(hditem.fmt & HDF_RIGHT)
uFormat |= DT_RIGHT;
else
uFormat |= DT_LEFT;

// Adjust the rect if the mouse button is pressed on it
if(lpDrawItemStruct->itemState == ODS_SELECTED)
{
rcLabel.left++;
rcLabel.top += 2;
rcLabel.right++;
}

// Adjust the rect further if Sort arrow is to be displayed
if( lpDrawItemStruct->itemID == (UINT)m_nSortCol )
{
rcLabel.right -= 3 * m_nOffset;
}

rcLabel.left += m_nOffset;
rcLabel.right -= m_nOffset;

// Draw column label
if(rcLabel.left < rcLabel.right)
{
//dc.SelectObject(&m_Font);
dc.DrawText(buf,-1,rcLabel, uFormat);
}

// Draw the Sort arrow
if(lpDrawItemStruct->itemID == (UINT)m_nSortCol)
{
CRect rcIcon(lpDrawItemStruct->rcItem);

// Set up pens to use for drawing the triangle
CPen penLite(PS_SOLID, 1, ::GetSysColor(COLOR_3DHILIGHT));
CPen penShad(PS_SOLID, 1, ::GetSysColor(COLOR_3DSHADOW));
CPen *pOldPen = dc.SelectObject(&penLite);

if(m_bSortAsc)
{
// Draw triangle pointing upwards
dc.MoveTo(rcIcon.right - 2*m_nOffset, m_nOffset-1);
dc.LineTo(rcIcon.right - 3*m_nOffset/2, rcIcon.bottom - m_nOffset);
dc.LineTo(rcIcon.right - 5*m_nOffset/2-2, rcIcon.bottom - m_nOffset);
dc.MoveTo(rcIcon.right - 5*m_nOffset/2-1, rcIcon.bottom - m_nOffset-1);

dc.SelectObject(&penShad);
dc.LineTo(rcIcon.right - 2*m_nOffset, m_nOffset-2);
}
else
{
// Draw triangle pointing downwords
dc.MoveTo(rcIcon.right - 3*m_nOffset/2, m_nOffset-1);
dc.LineTo(rcIcon.right - 2*m_nOffset-1, rcIcon.bottom - m_nOffset + 1);
dc.MoveTo(rcIcon.right - 2*m_nOffset-1, rcIcon.bottom - m_nOffset);

dc.SelectObject(&penShad);
dc.LineTo(rcIcon.right - 5*m_nOffset/2-1, m_nOffset -1);
dc.LineTo(rcIcon.right - 3*m_nOffset/2, m_nOffset -1);
}

// Restore the pen
dc.SelectObject(pOldPen);
}

dc.RestoreDC(nSavedDC);
dc.Detach();
//CHeaderCtrl::OnDrawItem(nIDCtl, lpDrawItemStruct);
}

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