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

  • As virtualization becomes the norm throughout organizations of nearly all sizes, and as more organizations look to private cloud solutions, IT decision makers are increasingly in need of ways to keep storage costs and complexity under control in the face of often-runaway virtual machine (VM) sprawl. Application-aware storage is designed to help achieve these important goals. Read this white paper to learn how application-aware storage allows you to gain VM-level visibility into application performance and …

  • Companies undertaking an IT project need to find the right balance between cost and functionality. It's important to start by determining whether to build a solution from scratch, buy an out-of-the-box solution, or a combination of both. In reality, most projects will require some system tailoring to meet business requirements. Decision-makers must understand how much software development is enough and craft a detailed implementation plan to ensure the project's success. This white paper examines the different …

Most Popular Programming Stories

More for Developers

RSS Feeds

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