MFC按钮重绘

 1 //按钮重绘函数
 2  void CWeather091001Dlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct) {
 3  CDC buttonDC; 
 4  CBitmap bitmapTrans; 
 5  BITMAP bmp; 
 6  CDC mem; 
 7  CRect rc; 
 8  buttonDC.Attach(lpDrawItemStruct->hDC);
 9 //得到用于绘制按钮的DC 
10  mem.CreateCompatibleDC(&buttonDC);
11 //准备向按钮区域传输图形
12  if(lpDrawItemStruct->CtlID == IDC_CLOSE)//重绘按钮的资源ID 
13 {
14  rc = lpDrawItemStruct->rcItem;
15 //获取按钮所占的矩形大小 
16  UINT state = lpDrawItemStruct->itemState;
17 //获取按钮当前的状态，不同状态绘制不同的按钮
18  if (state & ODS_FOCUS)//如果按钮已经取得焦点，绘制选中状态下的按钮 
19  { 
20  bitmapTrans.LoadBitmap(IDB_CLOSE3); 
21  } else { 
22  bitmapTrans.LoadBitmap(IDB_CLOSE1);
23  } 
24  bitmapTrans.GetBitmap(&bmp); 
25  CBitmap * old = mem.SelectObject(&bitmapTrans); 
26  //向按钮传输位图，使用stretcnblt可以使图片随按钮大小而改变 buttonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY); mem.SelectObject(old); bitmapTrans.DeleteObject(); 
27  } 
28  CDialogEx::OnDrawItem(nIDCtl, lpDrawItemStruct); 
29 }