请问Scroll的range，pos，page之间是什么关系

lanmu01 2010-04-05 11:48:19

我在CWnd中用SetScrollInfo添加滚动条，但是滚动的位置总是不对。
请问Scroll的range，pos，page之间是什么关系
还有我希望初始状态是无效的，就是有滚动条，没有滑块，而且滚动条灰显。应该如何做？

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向立天 2010-04-14

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您好
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lanmu01 2010-04-06

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MSDN我看了，但是还是搞不太明白

Eleven 2010-04-06

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MSDN...

lanmu01 2010-04-06

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在线等~各位帮帮忙

Selecting the "Horizontal Scroll" and "Verticla Scroll" styles among the properties of your dialog box in the resource editor, you can add scroll bars to the dialog box. Remember also to select the 'resizing' border style. However for adding functionality to the scroll bars, you need to override the WM_VSCROLL and WM_HSCROLL message handlers. Also,override the WM_SIZE handler to set the scroll bar range if the size is reduced than the original. So you get the original size of the dialog in your OninitDialog(). The code would look something like this. Modify to your needs. 1. To OnInitDialog(),add the following line. GetWindowRect(m_rect); m_nScrollPos = 0; to get the original window size. Make m_rect a member variable of your dialog. Add another variable m_nScrollPos and initialize its value to zero. It stores the current vertical scroll position. 2. Here is the WM_SIZE handler for setting the scroll bar range.Set range 0 if size is increased more than original. void CCharlesDlg::OnSize(UINT nType, int cx, int cy) { CDialog::OnSize(nType, cx, cy); // TODO: Add your message handler code here m_nCurHeight = cy; int nScrollMax; if (cy < m_rect.Height()) { nScrollMax = m_rect.Height() - cy; } else nScrollMax = 0; SCROLLINFO si; si.cbSize = sizeof(SCROLLINFO); si.fMask = SIF_ALL;// SIF_ALL = SIF_PAGE | SIF_RANGE | SIF_POS; si.nMin = 0; si.nMax = nScrollMax; si.nPage = si.nMax/10; si.nPos = 0; SetScrollInfo(SB_VERT, &si, TRUE); } You need m_nCurHeight to store the current height of the dialog and use it to handle the scrolling in OnVScroll. m_ncurHeight is also a member variable of the dialog. 3. Here is the handler for WM_VSCROLL. void CCharlesDlg::OnVScroll(UINT nSBCode,UINT nPos,CScrollBar* pScrollBar) { //TODO:Add your message handler code here and/or call default int nDelta; int nMaxPos = m_rect.Height() - m_nCurHeight; switch(nSBCode) { case SB_LINEDOWN: if (m_nScrollPos >= nMaxPos) return; nDelta = min(nMaxPos/100,nMaxPos-m_nScrollPos); break; case SB_LINEUP: if (m_nScrollPos <= 0) return; nDelta = -min(nMaxPos/100,m_nScrollPos); break; case SB_PAGEDOWN: if (m_nScrollPos >= nMaxPos) return; nDelta = min(nMaxPos/10,nMaxPos-m_nScrollPos); break; case SB_THUMBPOSITION: nDelta = (int)nPos - m_nScrollPos; break; case SB_PAGEUP: if (m_nScrollPos <= 0) return; nDelta = -min(nMaxPos/10,m_nScrollPos); break; default: return; } m_nScrollPos += nDelta; SetScrollPos(SB_VERT,m_nScrollPos,TRUE); ScrollWindow(0,-nDelta); CDialog::OnVScroll(nSBCode, nPos, pScrollBar); } The above code handles the vertical scrolling. For horizontal scrolling add the WM_HSCROLL similarly and add the necessary code to OnSize and OnInitDialog. Information provided in this document and any software that may accompany this document is provided "as is" without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. The user assumes the entire risk as to the accuracy and the use of this information.

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