MFC对话框水平和垂直滚动条功能

转载来自：https://blog.csdn.net/zhangchunbo135246/article/details/25234369

1.Resource View - Dialog - 主程序对话框 - 右键 - 属性 - Horizontal Scroll - true 和VerticalScroll - true；
2.Message - WM_HSCROLL ：OnHScroll回车，跳到.cpp文件添加代码，同理WM_HSCROLL；
3.添加代码

void CMyBSplineDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    // TODO: Add your message handler code here and/or call default
    SCROLLINFO scrollinfo; 
    GetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
    switch (nSBCode) 
    { 
        case SB_LEFT: 
            ScrollWindow((scrollinfo.nPos-scrollinfo.nMin)*10,0); 
            scrollinfo.nPos = scrollinfo.nMin; 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            break; 
        case SB_RIGHT: 
            ScrollWindow((scrollinfo.nPos-scrollinfo.nMax)*10,0); 
            scrollinfo.nPos = scrollinfo.nMax; 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            break; 
        case SB_LINELEFT: 
            scrollinfo.nPos -= 1; 
            if (scrollinfo.nPos<scrollinfo.nMin) 
            { 
                scrollinfo.nPos = scrollinfo.nMin; 
                break; 
            } 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            ScrollWindow(10,0); 
            break; 
        case SB_LINERIGHT: 
            scrollinfo.nPos += 1; 
            if (scrollinfo.nPos>scrollinfo.nMax) 
            { 
                scrollinfo.nPos = scrollinfo.nMax; 
                break; 
            } 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            ScrollWindow(-10,0); 
            break; 
        case SB_PAGELEFT: 
            scrollinfo.nPos -= 5; 
            if (scrollinfo.nPos<scrollinfo.nMin) 
            { 
                scrollinfo.nPos = scrollinfo.nMin; 
                break; 
            } 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            ScrollWindow(10*5,0); 
            break; 
        case SB_PAGERIGHT: 
            scrollinfo.nPos += 5; 
            if (scrollinfo.nPos>scrollinfo.nMax) 
            { 
                scrollinfo.nPos = scrollinfo.nMax; 
                break; 
            } 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            ScrollWindow(-10*5,0); 
            break; 
        case SB_THUMBPOSITION: 
            break; 
        case SB_THUMBTRACK: 
            ScrollWindow((scrollinfo.nPos-nPos)*10,0); 
            scrollinfo.nPos = nPos; 
            SetScrollInfo(SB_HORZ,&scrollinfo,SIF_ALL); 
            break; 
        case SB_ENDSCROLL: 
            break; 
    } 
    Invalidate();    
    CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}


void CMyBSplineDlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    // TODO: Add your message handler code here and/or call default
    SCROLLINFO scrollinfo;
    GetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
    switch (nSBCode) 
    { 
        case SB_BOTTOM: 
            ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMax)*10); 
            scrollinfo.nPos = scrollinfo.nMax; 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            break; 
        case SB_TOP: 
            ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMin)*10); 
            scrollinfo.nPos = scrollinfo.nMin; 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            break; 
        case SB_LINEUP: 
            scrollinfo.nPos -= 1; 
            if (scrollinfo.nPos<scrollinfo.nMin)
            { 
                scrollinfo.nPos = scrollinfo.nMin; 
                break;
            } 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            ScrollWindow(0,10); 
            break; 
        case SB_LINEDOWN:
            scrollinfo.nPos += 1; 
            if (scrollinfo.nPos>scrollinfo.nMax) 
            { 
                scrollinfo.nPos = scrollinfo.nMax; 
                break; 
            } 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            ScrollWindow(0,-10); 
            break; 
        case SB_PAGEUP: 
            scrollinfo.nPos -= 5; 
            if (scrollinfo.nPos<scrollinfo.nMin)
            { 
                scrollinfo.nPos = scrollinfo.nMin; 
                break; 
            } 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            ScrollWindow(0,10*5); 
            break; 
        case SB_PAGEDOWN: 
            scrollinfo.nPos += 5; 
            if (scrollinfo.nPos>scrollinfo.nMax) 
            { 
                scrollinfo.nPos = scrollinfo.nMax; 
                break; 
            } 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            ScrollWindow(0,-10*5); 
            break; 
        case SB_ENDSCROLL: 
            // MessageBox("SB_ENDSCROLL"); 
            break; 
            case SB_THUMBPOSITION: 
            // ScrollWindow(0,(scrollinfo.nPos-nPos)*10); 
            // scrollinfo.nPos = nPos; 
            // SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            break; 
        case SB_THUMBTRACK: 
            ScrollWindow(0,(scrollinfo.nPos-nPos)*10); 
            scrollinfo.nPos = nPos; 
            SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL); 
            break; 
    }
    Invalidate();
    CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}

标签：case,break,MFC,对话框,滚动条,nPos,SIF,SB,scrollinfo
来源： https://www.cnblogs.com/Galesaur-wcy/p/14184103.html