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


Comments

  • Very good code and article format !!! Level A article in CodeGuru.com

    Posted by Legacy on 08/11/2003 12:00am

    Originally posted by: Zhefu Zhang

    hope more article from you. Great job!

    Reply
  • very nice

    Posted by Legacy on 08/03/2002 12:00am

    Originally posted by: piers

    good work,I appreciate you!

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Tintri smart storage addresses the mismatch between storage and the demands of virtualization. Built on the industry's first and leading intelligent application-aware architecture, VMstore and Tintri Global Center have the intelligence to deliver unparalleled performance and efficiency and end-to-end insights into the infrastructure, while allowing for unmatched VM control.

  • New IT trends to support worker mobility -- such as VDI and BYOD -- are quickly gaining interest and adoption. But just as with any new trend, there are concerns and pitfalls to avoid. Download this paper to learn the most important considerations to keep in mind for your VDI project.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date