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

  • Live Event Date: May 6, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT While you likely have very good reasons for remaining on WinXP after end of support -- an estimated 20-30% of worldwide devices still are -- the bottom line is your security risk is now significant. In the absence of security patches, attackers will certainly turn their attention to this new opportunity. Join Lumension Vice President Paul Zimski in this one-hour webcast to discuss risk and, more importantly, 5 pragmatic risk mitigation techniques …

  • Ever-increasing workloads and the challenge of containing costs leave companies conflicted by the need for increased processing capacity while limiting physical expansion. Migration to HP's new generation of increased-density rack-and-blade servers can address growing demands for compute capacity while reducing costly sprawl. Sponsored by: HP and Intel® Xeon® processors Intel, the Intel logo, and Xeon Inside are trademarks of Intel Corporation in the U.S. and/or other countries. HP is the sponsor …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds