滚动条消失的条件是si.nPage >= si.nMax ,还是si.nMin==si.nMax?

booming 2005-04-23 09:47:28

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booming 2005-09-06

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因为结贴期限到，不得不结贴。其实答案还不大好。谁能提供更好答案。我另外开贴加分。谢谢！！

booming 2005-04-23

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si.nPage >= si.nMax-si.nMin
-----------
我觉得应该>吧？

booming 2005-04-23

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那为何，我这样做，滚动条不消失：
case WM_LBUTTONDOWN:
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_POS | SIF_RANGE |SIF_PAGE;
si.nPage = 500;
si.nPos = 5;
si.nMin =0;
si.nMax = 400;
SetScrollInfo(hWnd,SB_VERT,&si,TRUE);

return 0;

lvht1982 2005-04-23

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是si.nPage >= si.nMax-si.nMin

MFC对话框实现垂直和水平滚动条，欲知道如何实现，请下载！ //在OnInitDialog里添加如下代码为对话框创建一个垂直滚动条和水平滚动条 //获取窗口的大小 CRect rc; GetClientRect(&rc); const SIZE sz = { rc.right - rc.left, rc.bottom - rc.top }; //垂直滚动条 SCROLLINFO vsi; vsi.cbSize = sizeof(SCROLLINFO);//必须 vsi.fMask = SIF_PAGE | SIF_POS | SIF_RANGE; vsi.nPos = 1;//滚动条的初始位置 vsi.nMin = 0;//滚动条所能滚动的最小值 vsi.nMax = sz.cy+500; //滚动条所能滚动的最大值，可以根据实际情况设置 vsi.nPage = sz.cy;//一页的大小 SetScrollInfo(SB_VERT, &vsi, FALSE); //此函数将产生一个垂直滚动条 //水平滚动条 SCROLLINFO hsi; hsi.cbSize = sizeof(SCROLLINFO);//必须 hsi.fMask = SIF_PAGE | SIF_POS | SIF_RANGE; hsi.nPos = 1;//滚动条的初始位置 hsi.nMin = 0;//滚动条所能滚动的最小值 hsi.nMax = sz.cx+100; //滚动条所能滚动的最大值，可以根据实际情况设置 hsi.nPage = sz.cx;//一页的大小 SetScrollInfo(SB_HORZ, &hsi, FALSE); //此函数将产生一个水平滚动条

请帮忙完成滚动功能，谢谢！

鼠标中键按下拖动滚动条，运用VC++技术进行界面开发

VC直接生产的对话框是不带任何滚动条的，很简单的几行代码，就能够把垂直滚动条加上去了。很清晰的例子，分享给大家

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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