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：

[cpp] view plaincopy

1. void CSkinTreeCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)  
2. {  
3.     LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);  
4.       
5.     LPNMTVCUSTOMDRAW lpnmcd = (LPNMTVCUSTOMDRAW) pNMCD;  
6.     if (lpnmcd ->nmcd.dwDrawStage == CDDS_PREPAINT)  
7.     {  
8.         *pResult = CDRF_NOTIFYITEMDRAW;  
9.         return;  
10.     }  
11.     else if (lpnmcd->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)  
12.     {  
13.         CRect rcItem(pNMCD->rc);          // Item的区域  
14.         POINT ptItem ;   
15.         ptItem.x = rcItem.left + 1 ;   
16.         ptItem.y = rcItem.top + 1 ;   
17.         UINT uFlags;   
18.         HTREEITEM hItem = HitTest(ptItem, &uFlags);  // Item 句柄  
19.         if(!hItem)   
20.         {  
21.             *pResult = CDRF_DODEFAULT;  
22.             return;  
23.         }  
24.         CRect rcClient;  
25.         GetClientRect(&rcClient);  
26.         rcItem.left=0;  
27.         rcItem.right=rcClient.right;  
28.         rcItem.NormalizeRect();  
29.         HDC  hdcItem = pNMCD->hdc ;  //  Item的dc  
30.         CDC dc;  
31.         dc.Attach(hdcItem);  
32.         int nSave = dc.SaveDC();  
33.         dc.FillSolidRect(&rcItem,RGB(234, 237, 242));  
34.         //draw something  
35.         CString strText;  
36.         strText=GetItemText(hItem);  
37.         if (GetItemState(hItem, TVIS_SELECTED) == TVIS_SELECTED)  
38.         {     
39.             CImage img;  
40.             if (GetFocus() == this)  
41.             {  
42.                 img.LoadFromResource(AfxGetResourceHandle(), IDB_TREE_SELECT_BKG);  
43.             }  
44.             else  
45.             {  
46.                 img.LoadFromResource(AfxGetResourceHandle(), IDB_TREESELECT_NOFOCUS_BKG);  
47.             }  
48.             img.Draw(dc,rcItem);  
49.             img.Destroy();  
50.         }  
51.         rcItem.left += 30;  
52.         dc.SetTextColor(RGB(0,0,0));  
53.         dc.SetBkMode(TRANSPARENT);  
54.         CFont font;  
55.         font.CreateFont(12,   // nHeight  
56.             0,                         // nWidth  
57.             0,                         // nEscapement  
58.             0,                         // nOrientation  
59.             FW_NORMAL,                   // nWeight  
60.             FALSE,                     // bItalic  
61.             FALSE,                     // bUnderline  
62.             0,                         // cStrikeOut  
63.             ANSI_CHARSET,              // nCharSet  
64.             OUT_DEFAULT_PRECIS,        // nOutPrecision  
65.             CLIP_DEFAULT_PRECIS,       // nClipPrecision  
66.             DEFAULT_QUALITY,           // nQuality  
67.             DEFAULT_PITCH | FF_SWISS,  // nPitchAndFamily  
68.             TEXT("宋体"));  
69.         dc.SelectObject(&font);  
70.         dc.DrawText(strText, strText.GetLength(), &rcItem, DT_LEFT | DT_SINGLELINE | DT_VCENTER);  
71.         rcItem.left -= 30;  
72.         dc.RestoreDC(nSave);  
73.         dc.Detach();  
74.         *pResult = CDRF_SKIPDEFAULT;  
75.         return;  
76.     }  
77.      
78.     *pResult = CDRF_DODEFAULT;  
79.     return;  
80. }  
81. BOOL CSkinTreeCtrl::OnEraseBkgnd(CDC* pDC)  
82. {  
83.     CRect rcClient;  
84.     GetClientRect(&rcClient);  
85.     pDC->FillSolidRect(&rcClient,RGB(234, 237, 242));  
86.    return TRUE;  
87. }  

 

 

ui demo:

 

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