一个简单的滑动控件CSlideTab类

　　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
}