无边框窗口实现拖拉效果

 实现效果需要处理以下这三个消息:

WM_NCHITTEST  WM_SETCURSOR  WM_NCLBUTTONDOWN 

UINT CXXXDlg::OnNcHitTest(UINT nHitTest, CPoint point)
...{
 // TODO: 在此添加消息处理程序代码和/或调用默认值
 CRect rect;
 CRect rect1;
 GetWindowRect(&rect);
 rect1 = rect;
 rect1.DeflateRect(10, 10, -10, -10);
 rect1.NormalizeRect();

 if(point.x <= rect.left+3)
  return HTLEFT;
 else if(point.x >= rect.right-3)
  return HTRIGHT;
 else if(point.y <= rect.top+3)
  return HTTOP;
 else if(point.y >= rect.bottom-3)
  return HTBOTTOM;
 else if(point.x <= rect.left+10 && point.y <= rect.top+10)
  return HTTOPLEFT;
 else if(point.x >= rect.right-10 && point.y <= rect.top+10)
  return HTTOPRIGHT;
 else if(point.x <= rect.left+10 && point.y >= rect.bottom-10)
  return HTBOTTOMLEFT;
 else if(point.x >= rect.right-10 && point.y >= rect.bottom-10)
  return HTBOTTOMRIGHT;
 else if(!rect.IsRectEmpty())
 {
  LRESULT uRet = CWnd::OnNcHitTest(point);
  uRet = (uRet == HTCLIENT) ? HTCAPTION : uRet;
  return uRet;
 }
 else
 {
  return CWnd::OnNcHitTest(point);
 }
    return 0;
// return CWnd::OnNcHitTest(point);
}

BOOL CXXXDlg::OnSetCursor(HWND hWnd, UINT nHitTest, UINT message)
...{
    if(nHitTest == HTCAPTION || nHitTest == HTSYSMENU ||
       nHitTest == HTMENU || nHitTest == HTCLIENT)
   ...{
       SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
   }
   else if(nHitTest == HTTOP || nHitTest == HTBOTTOM)
   ...{
       SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS)));
   }
   else if(nHitTest == HTLEFT || nHitTest == HTRIGHT)
   ...{
       SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZEWE)));
   }
   else if(nHitTest == HTTOPLEFT || nHitTest == HTBOTTOMRIGHT)
   ...{
       SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENWSE)));
   }
   else if(nHitTest == HTTOPRIGHT || nHitTest == HTBOTTOMLEFT)
   ...{
       SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENESW)));
   }
   else
   ...{
       SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
    }
}

void CEditWnd::OnNcLButtonDown(UINT nHitTest, CPoint point)
{
 // TODO: 在此添加消息处理程序代码和/或调用默认值
   if(nHitTest == HTTOP)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOP, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTBOTTOM)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOM, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTLEFT)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_LEFT, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTRIGHT)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_RIGHT, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTTOPLEFT)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPLEFT, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTTOPRIGHT)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPRIGHT, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTBOTTOMLEFT)
       SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMLEFT, MAKELPARAM(point.x, point.y));
   else if(nHitTest == HTBOTTOMRIGHT)
       SendMessage(WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMRIGHT, MAKELPARAM(point.x, point.y));
   else if(nHitTest==HTCAPTION)
  SendMessage(WM_SYSCOMMAND, SC_MOVE | 4, MAKELPARAM(point.x, point.y));
 //CWnd::OnNcLButtonDown(nHitTest, point);
}

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