MFC实现字幕滚动效果

ON_WM_CTLCOLOR()
ON_WM_TIMER()
HBRUSH CDemoLEDDlg::OnCtlColor(CDC*pDC, CWnd* pWnd, UINT nCtlColor)
{
   HBRUSH hbr = CDialogEx::OnCtlColor(pDC,pWnd, nCtlColor);
   if(nCtlColor== CTLCOLOR_STATIC) 
   { 
     pDC->SetBkMode(TRANSPARENT); 
     pDC->SetTextColor(RGB(255,0, 0)); 
     return(HBRUSH)::GetStockObject(NULL_BRUSH); 
   }
   returnhbr;
}

m_font->CreatePointFont(160,_T("宋体"));

void CDemoLEDDlg::OnBnClickedButton1()
{
   if(m_flag) {
     SetTimer(1, 500, NULL);
     m_flag = false;
     return;
   }
 
   CString info;
   m_info.GetWindowTextW(info);
 
   CRect cRect;
   GetClientRect(cRect);  
<span style="white-space:pre"> </span> m_cx = cRect.Width();
   m_cy = cRect.Height();
 
   m_static->Create(info, WS_CHILD |WS_VISIBLE | SS_CENTER, CRect(m_cx - 30, 100, m_cx - 300 + 30, 140), this, IDC_STATIC_INFO);
   m_static->SetFont(m_font, FALSE);
 
   SetTimer(1, 500, NULL); 
}

void CDemoLEDDlg::OnTimer(UINT_PTR nIDEvent)
{
   if (1== nIDEvent)
   {
     m_static->SetWindowPos(NULL,m_cx - 30, 100, 300, 40, SWP_NOZORDER);
     m_cx = m_cx - 30;
     if(m_cx < -250) {
       KillTimer(1);
       m_cx = GetSystemMetrics(SM_CXSCREEN);
       m_static->SetWindowPos(NULL,m_cx - 30, 100, 300, 40, SWP_NOZORDER);
       SetTimer(1, 500,NULL);
     }
   }
 
   CDialogEx::OnTimer(nIDEvent);
}

void CDemoLEDDlg::OnPaint()
{
   if(IsIconic())
   {
     SendMessage(WM_ICONERASEBKGND,reinterpret_cast<WPARAM>(dc.GetSafeHdc()),0);
     intcxIcon = GetSystemMetrics(SM_CXICON);
     intcyIcon = GetSystemMetrics(SM_CYICON);
     CRect rect;
     GetClientRect(&rect);
     intx = (rect.Width() - cxIcon + 1) / 2;
     inty = (rect.Height() - cyIcon + 1) / 2;
     dc.DrawIcon(x, y, m_hIcon);
   }
   else
   {
     CPaintDC dc(this);
     CRect cRect;
     GetClientRect(cRect);
     CRect fRect(0, 90,cRect.Width(), 130);
     dc.FillSolidRect(fRect,RGB(0, 0, 0));
     CDialogEx::OnPaint();
   }
}