Create an Active Cursor on the Scroll Bar

Environment: VC6 SP5, VC.NET, Windows 2000

This code enables you to change the cursor dynamically on the scroll bar of the window, with scrolling capabilities. The variable m_nCursorID is used to prevent multiple loading of the cursor.


CMyWnd is derived from CWnd.

UINT m_nCursorID; //Current ID of the cursor resource

CMyWnd::CMyWnd()
{
m_nCursorID = 0;
}

BOOL CMyWnd::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
if (nHitTest == HTVSCROLL)
{
//Change cursor on the vertical scroll bar
if(m_nCursorID != IDC_VSCROLLBAR)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VSCROLLBAR));
m_nCursorID = IDC_VSCROLLBAR;
}
return true;
}
else if (nHitTest == HTHSCROLL)
{
//Change cursor on the horizontal scroll bar
if(m_nCursorID != IDC_HSCROLLBAR)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HSCROLLBAR));
m_nCursorID = IDC_HSCROLLBAR;
}
return true;
}
else
{
if(m_nCursorID != 0) m_nCursorID = 0;
return BaseClass::OnSetCursor(pWnd, nHitTest, message);
}

}

void CMyWnd::OnVScroll(UINT nSBCode, UINT nPos,
CScrollBar* pScrollBar)
{
switch (nSBCode) {
case SB_THUMBTRACK: //Drag scroll box to specified position
if(m_nCursorID != IDC_VTHUMBTRACK)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VTHUMBTRACK));
m_nCursorID = IDC_VTHUMBTRACK;
}
break;
case SB_LINEDOWN: //Scroll one line down
if(GetScrollPos(SB_VERT) == GetScrollLimit(SB_VERT))
{
if(m_nCursorID != IDC_VLINEDOWN_DISABLE)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VLINEDOWN_DISABLE));
m_nCursorID = IDC_VLINEDOWN_DISABLE;
}
}
else
{
if(m_nCursorID != IDC_VLINEDOWN)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VLINEDOWN));
m_nCursorID = IDC_VLINEDOWN;
}
}
break;
case SB_LINEUP: //Scroll one line up
SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
GetScrollInfo(SB_VERT, &info);
if(info.nPos == info.nMin)
{
if(m_nCursorID != IDC_VLINEUP_DISABLE)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VLINEUP_DISABLE));
m_nCursorID = IDC_VLINEUP_DISABLE;
}
}
else
{
if(m_nCursorID != IDC_VLINEUP)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VLINEUP));
m_nCursorID = IDC_VLINEUP;
}
}
break;
case SB_PAGEDOWN: //Scroll one page down
if(m_nCursorID != IDC_VPAGEDOWN)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VPAGEDOWN));
m_nCursorID = IDC_VPAGEDOWN;
}
break;
case SB_PAGEUP: //Scroll one page up
if(m_nCursorID != IDC_VPAGEUP)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_VPAGEUP));
m_nCursorID = IDC_VPAGEUP;
}
break;
}
BaseClass::OnVScroll(nSBCode, nPos, pScrollBar);
}

void CMyWnd::OnHScroll(UINT nSBCode, UINT nPos,
CScrollBar* pScrollBar)
{
switch (nSBCode) {
case SB_THUMBTRACK: //Drag scroll box to specified position
if(m_nCursorID != IDC_HTHUMBTRACK)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HTHUMBTRACK));
m_nCursorID = IDC_HTHUMBTRACK;
}
break;
case SB_LINEDOWN: //Scroll one line down
if(GetScrollPos(SB_HORZ) == GetScrollLimit(SB_HORZ))
{
if(m_nCursorID != IDC_HLINEDOWN_DISABLE)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HLINEDOWN_DISABLE));
m_nCursorID = IDC_HLINEDOWN_DISABLE;
}
}
else
{
if(m_nCursorID != IDC_HLINEDOWN)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HLINEDOWN));
m_nCursorID = IDC_HLINEDOWN;
}
}
break;
case SB_LINEUP: //Scroll one line up
SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
GetScrollInfo(SB_HORZ, &info);
if(info.nPos == info.nMin)
{
if(m_nCursorID != IDC_HLINEUP_DISABLE)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HLINEUP_DISABLE));
m_nCursorID = IDC_HLINEUP_DISABLE;
}
}
else
{
if(m_nCursorID != IDC_HLINEUP)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HLINEUP));
m_nCursorID = IDC_HLINEUP;
}
}
break;
case SB_PAGEDOWN: //Scroll one page down
if(m_nCursorID != IDC_HPAGEDOWN)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HPAGEDOWN));
m_nCursorID = IDC_HPAGEDOWN;
}
break;
case SB_PAGEUP: //Scroll one page up
if(m_nCursorID != IDC_HPAGEUP)
{
SetCursor(AfxGetApp()->LoadCursor(IDC_HPAGEUP));
m_nCursorID = IDC_HPAGEUP;
}
break;
}
BaseClass::OnHScroll(nSBCode, nPos, pScrollBar);
}

Downloads

Download demo project – 37 Kb

More by Author

Must Read