MFC的CListCtrl CustomDraw（）事件处理程序代码陷入

Question

目前我遇到一个问题，我OnNMCustomdrawlistctrlvalues（）事件处理函数被调用不停一旦我画一个CListCtrl一行红色（代码卡），导致我的应用一旦我尝试执行另一个事件（例如单击按钮）就会冻结。

我有以下代码：

void CSPID_FQA_Test_ClientDlg::OnNMCustomdrawlistctrlvalues(NMHDR *pNMHDR, LRESULT *pResult) 
{ 
    LPNMLVCUSTOMDRAW lpLVCustomDraw = reinterpret_cast<LPNMLVCUSTOMDRAW>(pNMHDR); 
    int itemCnt = 0; 
    CString text; 
    RECT rc; 

    switch(lpLVCustomDraw->nmcd.dwDrawStage) 
    { 
    case CDDS_ITEMPREPAINT: 
    case CDDS_ITEMPREPAINT | CDDS_SUBITEM: 
     //get each row text for 2nd column 
     itemCnt = mListCtrl.GetItemCount(); 
     for (int i = 0; i < itemCnt; i++) 
     { 
      text = mListCtrl.GetItemText(i, 2); 
      if (text.Compare("No") == 0) 
      { 
       if (i == (lpLVCustomDraw->nmcd.dwItemSpec)) 
       { 
        lpLVCustomDraw->clrTextBk = RGB(255,50,50); 
        mListCtrl.GetItemRect(i,&rc,LVIR_BOUNDS); 
        mListCtrl.InvalidateRect(&rc, 0); 
       } 
      } 
     } 
     break; 
    default: break; 
    } 

    *pResult = 0; 
    *pResult |= CDRF_NOTIFYITEMDRAW; 
    *pResult |= CDRF_NOTIFYSUBITEMDRAW; 
    *pResult |= CDRF_NOTIFYPOSTPAINT; 
} 

导致：

内的CListCtrl，如果我滚动到未涂成红色的区域，我的应用程序是精细。

我不是太清楚如何阻止这种情况发生......也许我需要动态地画一排红色的另一种方式？

---

编辑：我已经改变了我的代码以下，但我遇到了这个问题（仅适用于第二和第三列是彩色的，但是当我重新绘制列表控件即向下滚动然后备份，所有列然后绘制）：

void CSPID_FQA_Test_ClientDlg::OnNMCustomdrawlistctrlvalues(NMHDR *pNMHDR, LRESULT *pResult) 
{ 
    LPNMLVCUSTOMDRAW lpLVCustomDraw = reinterpret_cast<LPNMLVCUSTOMDRAW>(pNMHDR); 
    int itemCnt = 0; 
    CString text; 
    RECT rc; 

    CDC* pDC = CDC::FromHandle (lpLVCustomDraw->nmcd.hdc); 

    switch(lpLVCustomDraw->nmcd.dwDrawStage) 
    { 
    case CDDS_ITEMPOSTPAINT: 
    //case CDDS_ITEMPREPAINT: 
    //case CDDS_ITEMPREPAINT | CDDS_SUBITEM: 
     //get each row text for 2nd column 
     itemCnt = mListCtrl.GetItemCount(); 
     for (int i = 0; i < itemCnt; i++) 
     { 
      text = mListCtrl.GetItemText(i, 2); 
      if (text.Compare("No") == 0) 
      { 
       if (i == (lpLVCustomDraw->nmcd.dwItemSpec)) 
       { 
        //lpLVCustomDraw->clrTextBk = RGB(255,50,50); 
        mListCtrl.GetItemRect(i,&rc,LVIR_BOUNDS); 
        pDC->FillSolidRect (&rc, RGB (0, 255, 0)); 

        //mListCtrl.InvalidateRect(&rc, 0); 
       } 
      } 
     } 
     break; 
    default: break; 
    } 

    *pResult = 0; 
    *pResult |= CDRF_NOTIFYITEMDRAW; 
    *pResult |= CDRF_NOTIFYSUBITEMDRAW; 
    *pResult |= CDRF_NOTIFYPOSTPAINT; 
} 

---

EDIT2：我改成下面的代码，但我仍然得到同样的问题：

LPNMLVCUSTOMDRAW lpLVCustomDraw = reinterpret_cast<LPNMLVCUSTOMDRAW>(pNMHDR); 
CString text; 
RECT rc; 

CDC* pDC = CDC::FromHandle (lpLVCustomDraw->nmcd.hdc); 

switch(lpLVCustomDraw->nmcd.dwDrawStage) 
{ 
case CDDS_ITEMPOSTPAINT: 

    mListCtrl.GetItemRect(lpLVCustomDraw->nmcd.dwItemSpec,&rc,LVIR_BOUNDS); 
    text = mListCtrl.GetItemText(lpLVCustomDraw->nmcd.dwItemSpec, 2); 

    if (text.Compare("No") == 0) 
    { 
     pDC->FillSolidRect (&rc, RGB(0, 0, 255)); 
    } 

    break; 
default: break; 
} 

Answer 1

我觉得你的设计稍微偏离用CDDS_ITEMPREPAINT。我使用自定义绘制突出显示行中一个CListCtrl的颜色发黄。我这样做是通过利用CDDS_ITEMPOSTPAINT和使用FillSolidRect和DrawText CDC的方法。正如马克暗示，一些简单的运行实验（用什么我已在这个答案）应帮助。

编辑：使用CDDS_ITEMPOSTPAINT，您可以通过

CDC* pDC = CDC::FromHandle (pNMLVCD->nmcd.hdc); 

获得设备上下文获取，你要画可以通过

GetItemRect (row, &rect, LVIR_BOUNDS); 

进行渲染行的颜色是排corodinates完成

pDC->FillSolidRect (&rect, RGB (0, 255, 0)); 

而且，最后，画出每列文字

// draw each column's text into the corresponding CRect. 
for (col=0; col<nCols; ++col) 
    { 
    GetSubItemRect (row, col, LVIR_BOUNDS, rect); 
    rect.left += 6; 
    CString text = pRow->GetColumnText (col); 
    pDC->DrawText (text, &rect, DT_LEFT | DT_VCENTER | DT_SINGLELINE); 
    } 

您需要对上述代码进行必要的调整以满足您的需求。

Answer 2

试试这个：

void ColorListCtrl::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult) 
{ 
    NMLVCUSTOMDRAW *pNMLVCUSTOMDRAW = (NMLVCUSTOMDRAW *) pNMHDR; 
    *pResult = CDRF_DODEFAULT; 
    switch (pNMLVCUSTOMDRAW->nmcd.dwDrawStage) 
    { case CDDS_PREPAINT: 
      *pResult |= CDRF_NOTIFYITEMDRAW; 
      break; 
     case CDDS_ITEMPREPAINT: 
      // compare text in column 2 
      // set background to special color if matches 
      INT nItem = pNMLVCUSTOMDRAW->nmcd.dwItemSpec; 
      CString strText = GetItemText(nItem, 2); 
      if (strText==_T("No")) pNMLVCUSTOMDRAW->clrTextBk = RGB(255,0,0); 
      break; 
    } 
}