Any Possible to add Scroll Bars to SysLink Control in MFC

Question

If there is any chance to add Scroll Bars to SysLink Control in VC++ MFC Application?

Answer 1

Hi J Sathish Kumar,
CLinkCtrl class derive form CWnd class, so it can create with the common windows style WS_VSCROLL. So we could create a syslink control with this style.
https://msdn.microsoft.com/en-us/library/xw25kwch.aspx
PTCHAR url =
_T("Link 2) ")
_T("<A HREF=\"http://msdn2.microsoft.com/en-us/visualc/default.aspx\">")
_T("Microsoft VC++ Home")
_T("</A>");
//m_mylink is a object of a class derive from CLinkCtrl class.
m_mylink.Create(url,
(WS_VISIBLE | WS_TABSTOP | WS_CHILD | WS_BORDER|WS_VSCROLL),
CRect(
100, 100,
400, 240),
this,
IDC_SYSLINK2);
You need to create a class derive form CLinkCtrl class. And you will find the scrollbar cannnot scroll. Here is a workaround:
LRESULT CMyLinkCtrl::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
// TODO: Add your specialized code here and/or call the base class
if (message == WM_NCHITTEST || message == WM_NCLBUTTONDOWN || message == WM_NCLBUTTONDBLCLK)
return ::DefWindowProc(m_hWnd, message, wParam, lParam);
return CLinkCtrl::WindowProc(message, wParam, lParam);
Set the scrollbar information.
int CMyLinkCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
if (CLinkCtrl::OnCreate(lpCreateStruct) == -1)
return -1;
// TODO: Add your specialized creation code here
SCROLLINFO vinfo;
vinfo.cbSize = sizeof(vinfo);
vinfo.fMask = SIF_ALL;
vinfo.nPage = 30
vinfo.nMax = 140
vinfo.nMin=0;
vinfo.nTrackPos = 0;
SetScrollInfo(SB_VERT, &vinfo);//
return 0;
Handle the WM_VSCROLL message event in your new class CMyLinkCtrl.
void CMyLinkCtrl::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:
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;
CLinkCtrl::OnVScroll(nSBCode, nPos, pScrollBar);
Above code is just for test and help you understand how to add the scrollbar, you could make it more suitable for your situation. Hope this helps some. Example Screenshot:
Best regards,
Shu
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