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 }