看到论坛上有人提出，需要一个通用的滑动控件，考虑了一下，从CWnd继承了一个CSlideTab类，实现一些演示功能。

使用方法：

1. #include "slidetab.h" //在需要使用的窗口类的头文件中包含
   　
2. CSlideTab m_SlideTab; //声明一个CSlideTab的成员变量
   　
3. m_SlideTab.CreateTab(CRect(-1, -1, 50, 50), ID_SLIDETAB, this); //在窗口初始化过程中调用CSlideTab::CreateTab(CRect& rcTab, UINT nID, CWnd *pWndParent)方法，其中ID_SLIDETAB为控件ID，需要在资源文件中定义。
   　
4. m_SlideTab.SetHeight(400); //设置为向下展开，展开高度为400
   
   　　或者
   
   　　　　m_SlideTab.SetWidth(400);　　//设置为向右展开，展开宽度为400
   
   　　以上两个只有最后调用的有效。
   　
5. 可以重载这个类的DrawTab(CDC *pDC)虚拟成员函数，实现需要的界面效果。已经在内部实现双缓冲，直接在pDC上绘制即可。
   
   slidetab.h
   
   slidetab.h
   #pragma once
   #include "atltypes.h"
   
   
   // CSlideTab
   typedef enum _SLIDE_TAB_ACTION
   {
   SLIDE_TAB_UP = -1, SLIDE_TAB_STOP, SLIDE_TAB_DOWN
   }SLIDE_TAB_ACTION;
   
   class CSlideTab : public CWnd
   {
   DECLARE_DYNAMIC(CSlideTab)
   
   public:
   CSlideTab();
   virtual ~CSlideTab();
   
   protected:
   DECLARE_MESSAGE_MAP()
   public:
   void CreateTab(CRect& rcTab, UINT nID, CWnd *pWndParent);
   afx_msg void OnPaint();
   afx_msg void OnMouseMove(UINT nFlags, CPoint point);
   virtual BOOL PreTranslateMessage(MSG* pMsg);
   public:
   static void CALLBACK OpenTab(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2);
   int SetHeight(int nHeight);
   int SetWidth(int nWidth);
   afx_msg BOOL OnEraseBkgnd(CDC* pDC);
   virtual void DrawTab(CDC* pDC);
   afx_msg void OnDestroy();
   afx_msg void OnMove(int x, int y);
   private:
   UINT m_nTimerID;
   int m_nHeight;
   SLIDE_TAB_ACTION m_nAction;
   CRect m_rcWnd;
   BOOL m_fVert;
   };
   
   slidetab.cpp
   
   // SlideTab.cpp : 实现文件
   //
   
   #include "stdafx.h"
   #include "SlideTab.h"
   #include <Mmsystem.h>
   #include ".\slidetab.h"
   #pragma comment(lib,"winmm.lib")
   
   // CSlideTab
   
   IMPLEMENT_DYNAMIC(CSlideTab, CWnd)
   CSlideTab::CSlideTab()
   : m_nTimerID(0)
   , m_nHeight(100)
   , m_nAction(SLIDE_TAB_STOP)
   , m_fVert(FALSE)
   {
   }
   
   CSlideTab::~CSlideTab()
   {
   }
   
   
   BEGIN_MESSAGE_MAP(CSlideTab, CWnd)
   ON_WM_PAINT()
   ON_WM_MOUSEMOVE()
   ON_WM_ERASEBKGND()
   ON_WM_DESTROY()
   ON_WM_MOVE()
   END_MESSAGE_MAP()
   
   // CSlideTab 消息处理程序
   
   
   void CSlideTab::CreateTab(CRect& rcTab, UINT nID, CWnd *pWndParent)
   {
   m_rcWnd.CopyRect(rcTab);
   Create(AfxRegisterWndClass(CS_VREDRAW | CS_HREDRAW, NULL, NULL, NULL), NULL, WS_VISIBLE | WS_CHILD, rcTab, pWndParent, nID);
   }
   
   void CSlideTab::OnPaint()
   {
   CPaintDC dc(this); // device context for painting
   // TODO: 在此处添加消息处理程序代码
   // 不为绘图消息调用 CWnd::OnPaint()
   CRect ClientRect;
   GetClientRect(ClientRect);
   CBitmap MemBmp;
   MemBmp.CreateCompatibleBitmap(&dc, ClientRect.Width(), ClientRect.Height());
   CDC MemDC;
   MemDC.CreateCompatibleDC(&dc);
   CBitmap *pBmpOld = MemDC.SelectObject(&MemBmp);
   
   DrawTab(&MemDC);
   
   dc.BitBlt(ClientRect.left, ClientRect.top, ClientRect.Width(), ClientRect.Height(), &MemDC, 0, 0, SRCCOPY);
   
   MemDC.SelectObject(pBmpOld);
   MemDC.DeleteDC();
   MemBmp.DeleteObject();
   }
   
   void CSlideTab::OnMouseMove(UINT nFlags, CPoint point)
   {
   // TODO: 在此添加消息处理程序代码和/或调用默认值
   CRect rcTab;
   GetWindowRect(rcTab);
   if (m_nAction == SLIDE_TAB_UP)
   {
   m_nAction = SLIDE_TAB_DOWN;
   }
   else if (m_nAction == SLIDE_TAB_DOWN)
   {
   TRACKMOUSEEVENT mEvent;
   mEvent.cbSize = sizeof(TRACKMOUSEEVENT);
   mEvent.hwndTrack = this->GetSafeHwnd();
   mEvent.dwHoverTime = HOVER_DEFAULT;
   mEvent.dwFlags = TME_LEAVE;
   _TrackMouseEvent(&mEvent);
   }
   else if ((m_fVert && rcTab.Height() <= m_rcWnd.Height())
   || (!m_fVert && rcTab.Width() <= m_rcWnd.Width()))
   {
   TRACKMOUSEEVENT mEvent;
   mEvent.cbSize = sizeof(TRACKMOUSEEVENT);
   mEvent.hwndTrack = this->GetSafeHwnd();
   mEvent.dwHoverTime = HOVER_DEFAULT;
   mEvent.dwFlags = TME_HOVER;
   _TrackMouseEvent(&mEvent);
   }
   
   CWnd::OnMouseMove(nFlags, point);
   }
   
   BOOL CSlideTab::PreTranslateMessage(MSG* pMsg)
   {
   // TODO: 在此添加专用代码和/或调用基类
   if (pMsg->message == WM_MOUSEHOVER)
   {
   m_nAction = SLIDE_TAB_DOWN;
   if (!m_nTimerID)
   {
   m_nTimerID = timeSetEvent(5, 1, OpenTab, (DWORD_PTR)this, TIME_PERIODIC);
   }
   }
   else if (pMsg->message == WM_MOUSELEAVE)
   {
   m_nAction = SLIDE_TAB_UP;
   if (!m_nTimerID)
   {
   m_nTimerID = timeSetEvent(5, 1, OpenTab, (DWORD_PTR)this, TIME_PERIODIC);
   }
   }
   
   return CWnd::PreTranslateMessage(pMsg);
   }
   
   void CALLBACK CSlideTab::OpenTab(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)
   {
   CSlideTab *pTab = (CSlideTab*)dwUser;
   CRect rcTab;
   pTab->GetWindowRect(rcTab);
   int nTabHeight, nWndHeight;
   LONG *pBottom, *pTop;
   if (pTab->m_fVert)
   {
   nTabHeight = rcTab.Height();
   nWndHeight = pTab->m_rcWnd.Height();
   pTop = &rcTab.top;
   pBottom = &rcTab.bottom;
   }
   else
   {
   nTabHeight = rcTab.Width();
   nWndHeight = pTab->m_rcWnd.Width();
   pTop = &rcTab.left;
   pBottom = &rcTab.right;
   }
   if (((nTabHeight > nWndHeight) && pTab->m_nAction == SLIDE_TAB_UP)
   || (pTab->m_nAction == SLIDE_TAB_DOWN) &&(nTabHeight < pTab->m_nHeight))
   {
   pTab->GetParent()->ScreenToClient(rcTab);
   *pBottom += 5 * pTab->m_nAction;
   pTab->MoveWindow(rcTab, FALSE);
   if (pTab->m_nAction == SLIDE_TAB_UP)
   {
   *pTop = *pBottom;
   *pBottom = *pTop + 5;
   pTab->GetParent()->InvalidateRect(rcTab);
   }
   pTab->Invalidate();
   }
   else
   {
   timeKillEvent(pTab->m_nTimerID);
   pTab->m_nTimerID = 0;
   pTab->m_nAction = SLIDE_TAB_STOP;
   }
   }
   
   int CSlideTab::SetHeight(int nHeight)
   {
   m_fVert = TRUE;
   if (nHeight > m_rcWnd.Height())
   m_nHeight = nHeight;
   else
   m_nHeight = m_rcWnd.Height();
   return m_nHeight;
   }
   
   int CSlideTab::SetWidth(int nWidth)
   {
   m_fVert = FALSE;
   if (nWidth > m_rcWnd.Height())
   m_nHeight = nWidth;
   else
   m_nHeight = m_rcWnd.Height();
   return m_nHeight;
   }
   
   BOOL CSlideTab::OnEraseBkgnd(CDC* pDC)
   {
   // TODO: 在此添加消息处理程序代码和/或调用默认值
   return TRUE;
   return CWnd::OnEraseBkgnd(pDC);
   }
   
   void CSlideTab::DrawTab(CDC* pDC)
   {
   CRect ClientRect;
   GetClientRect(ClientRect);
   pDC->Rectangle(ClientRect);
   }
   
   void CSlideTab::OnDestroy()
   {
   CWnd::OnDestroy();
   
   // TODO: 在此处添加消息处理程序代码
   if (m_nTimerID)
   timeKillEvent(m_nTimerID);
   }
   
   
   void CSlideTab::OnMove(int x, int y)
   {
   CWnd::OnMove(x, y);
   
   // TODO: 在此处添加消息处理程序代码
   }