简单的自绘CListBox（多行显示）（覆盖DrawItem函数，然后用CDC绘制）

      之前写过一个自绘的CListBox类，详细请参考http://blog.csdn.net/VisualEleven/archive/2010/10/12/5935430.aspx
现在修改这之前的代码，使该CListBox能够支持多行显示的问题。

// 重写DrawItem虚函数
void CNewListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
 // TODO: Add your code to draw the specified item
 ASSERT(lpDrawItemStruct->CtlType == ODT_LISTBOX);
 LPCTSTR lpszText = (LPCTSTR) lpDrawItemStruct->itemData;
 ASSERT(lpszText != NULL);
 CDC dc;

 dc.Attach(lpDrawItemStruct->hDC);

 // Save these value to restore them when done drawing.
 COLORREF crOldTextColor = dc.GetTextColor();
 COLORREF crOldBkColor = dc.GetBkColor();

 // If this item is selected, set the background color
 // and the text color to appropriate values. Also, erase
 // rect by filling it with the background color.
 if ((lpDrawItemStruct->itemAction | ODA_SELECT) &&
  (lpDrawItemStruct->itemState & ODS_SELECTED))
 {
  dc.SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
  dc.SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));
  dc.FillSolidRect(&lpDrawItemStruct->rcItem,
   ::GetSysColor(COLOR_HIGHLIGHT));
 }
 else
 {
  if(lpDrawItemStruct->itemID%2)
   dc.FillSolidRect(&lpDrawItemStruct->rcItem, RGB(128,128,128));
  else
   dc.FillSolidRect(&lpDrawItemStruct->rcItem, RGB(255,128,255));
 }

 // If this item has the focus, draw a red frame around the
 // item's rect.
 if ((lpDrawItemStruct->itemAction | ODA_FOCUS) &&
  (lpDrawItemStruct->itemState & ODS_FOCUS))
 {
  CBrush br(RGB(0, 0, 128));
  dc.FrameRect(&lpDrawItemStruct->rcItem, &br);
 }
 lpDrawItemStruct->rcItem.left += 5;
 // Draw the text.
 dc.DrawText(
  lpszText,
  strlen(lpszText),
  &lpDrawItemStruct->rcItem,
  DT_WORDBREAK);

 // Reset the background color and the text color back to their
 // original values.
 dc.SetTextColor(crOldTextColor);
 dc.SetBkColor(crOldBkColor);

 dc.Detach();
}



// 重写MeasureItem虚函数

void CNewListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
 // TODO: Add your code to determine the size of specified item
 ASSERT(lpMeasureItemStruct->CtlType == ODT_LISTBOX);
 LPCTSTR lpszText = (LPCTSTR) lpMeasureItemStruct->itemData;
 ASSERT(lpszText != NULL);
 CRect rect;
 GetItemRect(lpMeasureItemStruct->itemID, &rect);

 CDC* pDC = GetDC();
 lpMeasureItemStruct->itemHeight = pDC->DrawText(lpszText, -1, rect, DT_WORDBREAK | DT_CALCRECT);
 ReleaseDC(pDC);
}

// 调用方法

CNewListBox m_listBox; // 成员变量



#define IDC_LISTBOX 0x1010
 m_listBox.Create(WS_CHILD | WS_VISIBLE | WS_BORDER | WS_HSCROLL | WS_VSCROLL |
  LBS_OWNERDRAWVARIABLE , CRect(0, 0, 300, 200), this, IDC_LISTBOX);

 for(int i=0; i<10; i++)
 {
  if(i%2)
   m_listBox.AddString(_T("Hello,World1/r/nHello,World2"));
  else
   m_listBox.AddString(_T("Hello,World"));
 }

  

效果图如下所示：

 

 

http://blog.csdn.net/visualeleven/article/details/6062383