VC对话框自带滚动条的使用

1 　　　　SCROLLINFO vinfo;
2        vinfo.cbSize=sizeof(vinfo);
3        vinfo.fMask=SIF_ALL;
4        vinfo.nPage=50;//滚动块自身的长短，通常有如下关系：其长度/滚动条长度（含两个箭头）=nPage/(nMax+2)，
5                   //另外nPage取值-1时，滚动条会不见了。
6        vinfo.nMax=600;//滚动条所能滚动的最大值
7        vinfo.nMin=0;//滚动条所能滚动的最小值
8        vinfo.nTrackPos=0;
9        SetScrollInfo(SB_VERT,&vinfo);//即使上述步骤一不做，使用此条语句也可以显示滚动条

 1 void CMy1d0Dlg::OnVScroll(UINT nSBCode,UINT nPos, CScrollBar* pScrollBar)
 2 {
 3        //TODO: Add your message handler code here and/or call default
 4  
 5        SCROLLINFO scrollinfo;
 6        GetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
 7  
 8 switch (nSBCode)
 9 {
10 case SB_BOTTOM: //滑块滚动到最底部
11 ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMax)*10); //滚动屏幕
12 scrollinfo.nPos = scrollinfo.nMax; //设定滑块新位置
13 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); //更新滑块位置
14 break;
15 case SB_TOP: //滑块滚动到最顶部
16 ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMin)*10);
17 scrollinfo.nPos = scrollinfo.nMin;
18 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
19 break;
20 case SB_LINEUP: //单击上箭头
21 scrollinfo.nPos -= 1;
22 if (scrollinfo.nPos<scrollinfo.nMin)
23 {
24 scrollinfo.nPos = scrollinfo.nMin;
25 break;
26 }
27 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
28 ScrollWindow(0,10);
29 break;
30 case SB_LINEDOWN: //单击下箭头
31 scrollinfo.nPos += 1;
32 if (scrollinfo.nPos>scrollinfo.nMax)
33 {
34 scrollinfo.nPos = scrollinfo.nMax;
35 break;
36 }
37 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
38 ScrollWindow(0,-10);
39 break;
40 case SB_PAGEUP: //单击滑块上方空白区域
41 scrollinfo.nPos -= 5;
42 if (scrollinfo.nPos<scrollinfo.nMin)
43 {
44 scrollinfo.nPos = scrollinfo.nMin;
45 break;
46 }
47 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
48 ScrollWindow(0,10*5);
49 break;
50 case SB_PAGEDOWN: //单击滑块下方空白区域
51 scrollinfo.nPos += 5;
52 if (scrollinfo.nPos>scrollinfo.nMax)
53 {
54 scrollinfo.nPos = scrollinfo.nMax;
55 break;
56 }
57 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
58 ScrollWindow(0,-10*5);
59 break;
60 case SB_ENDSCROLL: //鼠标离开滑块，结束滑块拖动
61 // MessageBox("SB_ENDSCROLL");
62 break;
63 case SB_THUMBPOSITION:
64 // ScrollWindow(0,(scrollinfo.nPos-nPos)*10);
65 // scrollinfo.nPos = nPos;
66 // SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
67 break;
68 case SB_THUMBTRACK: //拖动滑块
69 ScrollWindow(0,(scrollinfo.nPos-nPos)*10);
70 scrollinfo.nPos = nPos;
71 SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
72 break;
73 }
74  
75  CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
76 }