控件自绘之CRadioListBox

源代码及可执行文件下载地址:http://files.cnblogs.com/rainboy2010/CRadioListBox.zip

主要代码如下:

void CRadioListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 

{

     CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);

     if (lpDrawItemStruct->itemID == (UINT)-1)

     {

          if (lpDrawItemStruct->itemAction & ODA_FOCUS) pDC->DrawFocusRect(&lpDrawItemStruct->rcItem);

          return;

     }

     else

     {

          int selChange   = lpDrawItemStruct->itemAction & ODA_SELECT;

          int focusChange = lpDrawItemStruct->itemAction & ODA_FOCUS;

          int drawEntire  = lpDrawItemStruct->itemAction & ODA_DRAWENTIRE;



           BOOL sel = lpDrawItemStruct->itemState & ODS_SELECTED;



          if (selChange || drawEntire) 

          {

               CString strText;

               GetText(lpDrawItemStruct->itemID,strText);



              

               pDC->FillSolidRect(&lpDrawItemStruct->rcItem, ::GetSysColor((GetExStyle()&WS_EX_TRANSPARENT)?COLOR_BTNFACE:COLOR_WINDOW));



               // Draw radio button

               int h = lpDrawItemStruct->rcItem.bottom - lpDrawItemStruct->rcItem.top;

               CRect rect(lpDrawItemStruct->rcItem.left+2, lpDrawItemStruct->rcItem.top+2, 

                lpDrawItemStruct->rcItem.left+h-3, lpDrawItemStruct->rcItem.top+h-3);

               pDC->DrawFrameControl(&rect, DFC_BUTTON, DFCS_BUTTONRADIO | (sel?DFCS_CHECKED:0));



       

               pDC->SetTextColor(COLOR_WINDOWTEXT);

               pDC->SetBkMode(TRANSPARENT);

               lpDrawItemStruct->rcItem.left += h;



               pDC->DrawText(strText, &lpDrawItemStruct->rcItem, DT_LEFT|DT_VCENTER|DT_SINGLELINE);



            

          }



          if (focusChange  && lpDrawItemStruct->itemState & ODS_FOCUS && sel)

          {

              pDC->DrawFocusRect(&lpDrawItemStruct->rcItem);

          }

         

     }

}