how to scroll window in xtpreportctrl
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Category: Codejock Products
Forum Name: Report Control
Forum Description: Topics Related to Codejock Report Control
URL: http://forum.codejock.com/forum_posts.asp?TID=24118
Printed Date: 02 January 2025 at 9:52am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: how to scroll window in xtpreportctrl
Posted By: yangyanhui
Subject: how to scroll window in xtpreportctrl
Date Posted: 21 December 2020 at 8:21pm
 HI,I create a xtpreportctrl and a vertical scrollbar. When I add a record I need to scroll window to the top to show the latest record(the new record is inserted on the top).I write the following code in onvscroll event: SCROLLINFO scrollinfo; GetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL); if (nSBCode == SB_TOP) { ScrollWindow(0, -(scrollinfo.nMax - scrollinfo.nMin) * 10); scrollinfo.nPos = scrollinfo.nMin; SetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL); } VPos = nPos; m_pScrollBarVer->SetScrollPos(nPos); CXTPReportControl::OnVScroll(nSBCode, nPos, pScrollBar); it do not work,what is wrong?
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Replies:
Posted By: yangyanhui
Date Posted: 22 December 2020 at 1:34am
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I find that the reportctrl try to scroll itself with header rows. When I use mousewheel to scroll, I can get the correct result.However, When I scroll with commands in the scrollbar and use ScrollWindow in ONVSCROLL, it try to scroll the whole window with header rows: CXTPReportControl::OnVScroll(nSBCode, nPos, pScrollBar); //} switch (nSBCode) { case SB_LINEUP: { pScrollBar->SetScrollPos(pScrollBar->GetScrollPos() - 1); ScrollWindow(0, -1); break; } case SB_LINEDOWN: { pScrollBar->SetScrollPos(pScrollBar->GetScrollPos() + 1); ScrollWindow(0, 1); break; } case SB_PAGEUP: { pScrollBar->SetScrollPos(pScrollBar->GetScrollPos() - 5); ScrollWindow(0, -5); break; } case SB_PAGEDOWN: { pScrollBar->SetScrollPos(pScrollBar->GetScrollPos() + 5); ScrollWindow(0, 5); break; } case SB_THUMBTRACK: { ScrollWindow(0, nPos - pScrollBar->GetScrollPos()); pScrollBar->SetScrollPos(nPos); break; } case SB_TOP: { pScrollBar->SetScrollPos(0); ScrollWindow(0, -nPos); break; } } |
Posted By: yangyanhui
Date Posted: 22 December 2020 at 2:37am
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void CSelfReportControl::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) { if (m_pScrollBarVer && pScrollBar == m_pScrollBarVer) { if (HavPud&&nPos == 0) { HavPud = false; return; } HavPud = true; VPos = nPos; CXTPReportControl::OnVScroll(nSBCode, nPos, 0); } } I find that when I operate with the scrollbar,it works well. But when I operate outside scrollbar(for example,SendMessage(WM_VSCROLL, MAKEWPARAM(SB_TOP, 0), NULL);),the pScrollBar will be null and the operation will fail
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Posted By: yangyanhui
Date Posted: 23 December 2020 at 12:46am
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I use m_wndReportCtrlDir.SendMessage(WM_VSCROLL, SB_TOP, (LPARAM)m_wndReportCtrlDir.m_pScrollBarVer->GetSafeHwnd());
to send the message.When I track into the code, I found CXTPReportControl::OnVScroll(nSBCode, nPos, 0); is executed,but it did not work.What might be wrong?
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