自绘标准CTreeCtrl的实现（NM_CUSTORMDRAW方法）

自绘树CTreeCtrl可以自己用子类化在派生类里的OnPaint里绘制也可以响应

NM_CUSTORMDRAW这个反射消息，然后绘制，NM_CUSTORMDRAW里有个什么绘画周期的概念，他可以在不同的绘画段

绘制不同的内容，这里具体细节不再赘述，读者可以参考MSDN，这里主要阐述NM_CUSTORMDRAW的绘制方式：

 void CSkinTreeCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)
 {
     LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);

     LPNMTVCUSTOMDRAW lpnmcd = (LPNMTVCUSTOMDRAW) pNMCD;
     if (lpnmcd ->nmcd.dwDrawStage == CDDS_PREPAINT)
     {
         *pResult = CDRF_NOTIFYITEMDRAW;
         return;
     }
     else if (lpnmcd->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)
     {
         CRect rcItem(pNMCD->rc);          // Item的区域
         POINT ptItem ;
         ptItem.x = rcItem.left + 1 ;
         ptItem.y = rcItem.top + 1 ;
         UINT uFlags;
         HTREEITEM hItem = HitTest(ptItem, &uFlags);  // Item 句柄
         if(!hItem)
         {
             *pResult = CDRF_DODEFAULT;
             return;
         }
         CRect rcClient;
         GetClientRect(&rcClient);
         rcItem.left=0;
         rcItem.right=rcClient.right;
         rcItem.NormalizeRect();
         HDC  hdcItem = pNMCD->hdc ;  //  Item的dc
         CDC dc;
         dc.Attach(hdcItem);
         int nSave = dc.SaveDC();
         dc.FillSolidRect(&rcItem,RGB(234, 237, 242));
         //draw something
         CString strText;
         strText=GetItemText(hItem);
         if (GetItemState(hItem, TVIS_SELECTED) == TVIS_SELECTED)
         {
             CImage img;
             if (GetFocus() == this)
             {
                 img.LoadFromResource(AfxGetResourceHandle(), IDB_TREE_SELECT_BKG);
             }
             else
             {
                 img.LoadFromResource(AfxGetResourceHandle(), IDB_TREESELECT_NOFOCUS_BKG);
             }
             img.Draw(dc,rcItem);
             img.Destroy();
         }
         rcItem.left += 30;
         dc.SetTextColor(RGB(0,0,0));
         dc.SetBkMode(TRANSPARENT);
         CFont font;
         font.CreateFont(12,   // nHeight
             0,                         // nWidth
             0,                         // nEscapement
             0,                         // nOrientation
             FW_NORMAL,                   // nWeight
             FALSE,                     // bItalic
             FALSE,                     // bUnderline
             0,                         // cStrikeOut
             ANSI_CHARSET,              // nCharSet
             OUT_DEFAULT_PRECIS,        // nOutPrecision
             CLIP_DEFAULT_PRECIS,       // nClipPrecision
             DEFAULT_QUALITY,           // nQuality
             DEFAULT_PITCH | FF_SWISS,  // nPitchAndFamily
             TEXT("宋体"));
         dc.SelectObject(&font);
         dc.DrawText(strText, strText.GetLength(), &rcItem, DT_LEFT | DT_SINGLELINE | DT_VCENTER);
         rcItem.left -= 30;
         dc.RestoreDC(nSave);
         dc.Detach();
         *pResult = CDRF_SKIPDEFAULT;
         return;
     }

     *pResult = CDRF_DODEFAULT;
     return;
 }
 BOOL CSkinTreeCtrl::OnEraseBkgnd(CDC* pDC)
 {
     CRect rcClient;
     GetClientRect(&rcClient);
     pDC->FillSolidRect(&rcClient,RGB(234, 237, 242));
    return TRUE;
 }

 

 

ui demo:

 

转帖：http://blog.csdn.net/hurryboylqs/article/details/5548605