CScrollBar的使用

在对话框中添加一个垂直滚动条控件，关联一个变量CScrollBar m_vScroll，在头文件定义CRect rt_mvScroll保存滚动条控件的位置,

定义一个int nVscroll,保存滑块的位置在OnInitDialog()里面添加

CRect rect;GetClientRect(rect);SCROLLINFO si;si.cbSize = sizeof(SCROLLINFO);;si.nMin = 0;si.nMax = 100;si.nPage = 5 ;si.fMask = SIF_POS|SIF_RANGE|SIF_PAGE;m_vScroll.SetScrollInfo(&si, TRUE);m_vScroll.GetWindowRect(rt_mvScroll);//滚动条所在的位置ScreenToClient(rt_mvScroll);

 

 

响应对话框中WM_VScorll消息

 

void CScrollDemoDlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar){// TODO: 在此添加消息处理程序代码和/或调用默认值SCROLLINFO si;si.cbSize = sizeof(si);m_vScroll.GetScrollInfo(&si, SIF_POS|SIF_PAGE|SIF_RANGE);nVscroll = si.nPos;switch(nSBCode){case SB_LINEDOWN: nVscroll += 10; if (nVscroll > (si.nMax - si.nMin - si.nPage )){nVscroll = si.nMax - si.nMin - si.nPage;}break;case SB_LINEUP: nVscroll -= 10;if (nVscroll < si.nMin){nVscroll = 0;}break;case SB_PAGEDOWN: nVscroll += si.nPage; if (nVscroll > (si.nMax - si.nMin - si.nPage)){nVscroll = si.nMax - si.nMin - si.nPage;}break;case SB_PAGEUP: nVscroll -= si.nPage;if (nVscroll < si.nMin){nVscroll = 0;}break;case SB_THUMBTRACK: nVscroll = nPos; break;}ScrollWindow(0, -(nVscroll -si.nPos) , NULL ,NULL);m_vScroll.MoveWindow(rt_mvScroll, TRUE);si.fMask = SIF_POS;si.nPos = nVscroll;m_vScroll.SetScrollInfo(&si, TRUE);CDialog::OnVScroll(nSBCode, nPos, pScrollBar);}

 

 

响应WM_MOUSEWHELL消息

BOOL CScrollDemoDlg::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt){// TODO: 在此添加消息处理程序代码和/或调用默认值 //向下滚if (zDelta == -120){ nVscroll += 10; OnVScroll(SB_PAGEDOWN, nVscroll, &m_vScroll);}else if (zDelta == 120){nVscroll -= 10;OnVScroll(SB_PAGEUP, nVscroll, &m_vScroll);}m_vScroll.MoveWindow(rt_mvScroll, TRUE);return CDialog::OnMouseWheel(nFlags, zDelta, pt);}