VC ListCtrl中嵌入进度条

VC中在listctrl中嵌入进度条，截图如下：

其实要实现这个非常容易，以下是自绘ListCtrl的代码，首先继承CListCtrl，
然后增加函数OnCustomDraw：
void CProcessList::OnCustomDraw(NMHDR *pNMHDR, LRESULT *pResult)
{
 //draw each item.set txt color,bkcolor....
 NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>(pNMHDR);
 
 // Take the default processing unless we set this to something else below.
 *pResult = CDRF_DODEFAULT;
 
 // First thing - check the draw stage. If it’s the control’s prepaint
 // stage, then tell Windows we want messages for every item.
 
 if (pLVCD->nmcd.dwDrawStage == CDDS_PREPAINT)
 {
  *pResult = CDRF_NOTIFYITEMDRAW;
 }
 else if (pLVCD->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)
 {
  // This is the notification message for an item.  We’ll request
  // notifications before each subitem’s prepaint stage.
  
  *pResult = CDRF_NOTIFYSUBITEMDRAW;
 }
 else if (pLVCD->nmcd.dwDrawStage == (CDDS_ITEMPREPAINT | CDDS_SUBITEM))
 {
  // This is the prepaint stage for a subitem. Here’s where we set the
  // item’s text and background colors. Our return value will tell
  // Windows to draw the subitem itself, but it will use the new colors
  // we set here.
  
  int nItem = static_cast<int> (pLVCD->nmcd.dwItemSpec);
  int nSubItem = pLVCD->iSubItem;
  
  if(nSubItem != 2)//这里我只重绘第二列
   return;

  COLORREF crText  = ::GetSysColor(COLOR_WINDOWFRAME);
  COLORREF crBkgnd = ::GetSysColor(COLOR_WINDOW);
  
  CDC* pDC = CDC::FromHandle(pLVCD->nmcd.hdc);
  CRect rect;
  GetSubItemRect(nItem, nSubItem, LVIR_BOUNDS, rect);
  if (GetItemState(nItem, LVIS_SELECTED))
   DrawText(nItem, nSubItem, pDC, ::GetSysColor(COLOR_HIGHLIGHT),
   ::GetSysColor(COLOR_HIGHLIGHT), rect);
  else
   DrawText(nItem, nSubItem, pDC, crText, crBkgnd, rect);

  *pResult = CDRF_SKIPDEFAULT; // We’ve painted everything.
 }
}

然后为该函数增加消息映射(#add 其实是消息反射)：
ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw)

最后我们为画进度条而努力，这里程序中把进度存在ItemData中。
void CProcessList::DrawText(int nItem,
        int nSubItem,
        CDC *pDC,
        COLORREF crText,
        COLORREF crBkgnd,
        CRect &rect)
{
 ASSERT(pDC);
 pDC->FillSolidRect(&rect, crBkgnd);
 
 int nProcess = GetItemData(nItem);
 CRect procRect = rect;
 pDC->Rectangle(procRect);

 procRect.left += 1;
 procRect.bottom -= 1;
 procRect.top += 1;
 procRect.right = procRect.left + rect.Width() * nProcess / 100;
 CBrush brush(RGB(255,0,0));
 pDC->FillRect(&procRect, &brush);
 
 CString str;
 str.Format("%d%%", nProcess);
 
 if (!str.IsEmpty())
 {
  UINT nFormat = DT_VCENTER | DT_SINGLELINE | DT_CENTER;
  
  pDC->SetBkMode(TRANSPARENT);
  pDC->SetTextColor(crText);
  pDC->SetBkColor(crBkgnd);
  pDC->DrawText(str, &rect, nFormat);
 }
}

 

 

上面用到一个结构，是存放于ItemData中用来表示进度和步长的：
typedef struct _ProcessLCI_Data_
{
            int  nProportion;
           int  nStep;
} PLCIDATA, *LPPLCIDATA;

接下来就是在容器中使用继承的ListCtrl了，这里使用对话框，在一个定时器中模拟进度的变化（其它的初始化和清除就不罗嗦了）：

void CListCtrlProcessDlg::OnTimer(UINT nIDEvent)
{
      if(nIDEvent == TIMER_PROCESS)
      {
                    BOOL bPaint = FALSE;
         for(int i = 0; i < m_listProcess.GetItemCount(); ++i)
          {
                     LPPLCIDATA pIData = (LPPLCIDATA)m_listProcess.GetItemData(i);
                     if(pIData->nProportion >= 100)
                              continue;
                     bPaint = TRUE;
                     if(pIData->nProportion + pIData->nStep > 100)
                     {
                               pIData->nProportion = 100;
                     }
                     else
                     {
                               pIData->nProportion += pIData->nStep;
                     }
           }
           if(bPaint)
                     m_listProcess.Invalidate(FALSE);
     }
     CDialog::OnTimer(nIDEvent);
}

   这里有个奇怪的问题，在VC6中不调上面的Invalidate()，只要TIMMER发生，进度条都会自动刷新。但在VC71上编译，如果不调Invalidate()，根本不刷新？？？不解！！！
   从运行的结果看，效果还不错。VC6编译的就是满100%后进度条还是不停的闪烁；而VC71就不会了，因为没有调Invalidate()？？？

 

怎么样？很简单吧，其实使用VC开发界面也非常迅速的，虽然还是觉得MFC的封装有JAVA界面库封装得那么好该多好啊