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[转载自：http://www.sudu.cn/info/html/edu/20080403/260953.html]

我们经常会在程序中提供一个全屏显示的功能，如何实现呢？

第一步：声明FullScreenHandler类。

#ifndef __FullScreenHandler_h__#define __FullScreenHandler_h__class CFullScreenHandler{ public:    CFullScreenHandler();    ~CFullScreenHandler();    void Maximize(CFrameWnd* pFrame, CWnd* pView);    void Restore(CFrameWnd* pFrame);    BOOL InFullScreenMode() {  return !m_rcRestore.IsRectEmpty();  }    CSize GetMaxSize();protected:    CRect m_rcRestore;};#endif  //__FullScrennHandler_h__// Global instanceextern CFullScreenHandler FullScreenHandler;

#include "FullScreenHandler.h"// Global object handles full-screen modeCFullScreenHandler FullScreenHandler;CFullScreenHandler::CFullScreenHandler(){     m_rcRestore.SetRectEmpty();}CFullScreenHandler::~CFullScreenHandler(){ }//// Resize frame so view’s client area fills the entire screen. Use// GetSystemMetrics to get the screen size -- the rest is pixel// arithmetic.//void CFullScreenHandler::Maximize(CFrameWnd* pFrame, CWnd* pView){     // get view rectangle    if (pView) {         CRect rcv;        pView->GetWindowRect(&rcv);        // get frame rectangle        pFrame->GetWindowRect(m_rcRestore); // save for restore        const CRect& rcf = m_rcRestore;             // frame rect        // now compute new rect        CRect rc(0,0, GetSystemMetrics(SM_CXSCREEN),            GetSystemMetrics(SM_CYSCREEN));        rc.left  += rcf.left  - rcv.left;        rc.top   += rcf.top   - rcv.top;        rc.right += rcf.right - rcv.right;        rc.bottom+= rcf.bottom- rcv.bottom;        // move frame!        pFrame->SetWindowPos(NULL, rc.left, rc.top,            rc.Width(), rc.Height(), SWP_NOZORDER);    }}void CFullScreenHandler::Restore(CFrameWnd* pFrame){     const CRect& rc = m_rcRestore;    pFrame->SetWindowPos(NULL, rc.left, rc.top,        rc.Width(), rc.Height(), SWP_NOZORDER);    m_rcRestore.SetRectEmpty();}CSize CFullScreenHandler::GetMaxSize(){     CRect rc(0,0,        GetSystemMetrics(SM_CXSCREEN),GetSystemMetrics(SM_CYSCREEN));    rc.InflateRect(10,50);    return rc.Size();}

第三步：定义ID_VIEW_FULL_SCREEN资源，响应视图的WM_GETMINMAXINFO消息

CRect m_rcRestore;    afx_msg void OnGetMinMaxInfo(MINMAXINFO* lpmmi);BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)    ON_WM_GETMINMAXINFO()END_MESSAGE_MAP()//// Important to handle this in order to set size// of window larger than whole screen.//void CMainFrame::OnGetMinMaxInfo(MINMAXINFO* lpmmi){     CSize sz = FullScreenHandler.GetMaxSize();    lpmmi->ptMaxSize = CPoint(sz);    lpmmi->ptMaxTrackSize = CPoint(sz);}//// View full screen mode. Calls CFullScreenHandler to do the work.//void CMainFrame::OnViewFullScreen(){     if (FullScreenHandler.InFullScreenMode())        FullScreenHandler.Restore(this);    else        FullScreenHandler.Maximize(this, GetActiveView());        //如果是拆分窗口则应为FullScreenHandler.Maximize(this, m_wndSplitter); }//// Put checkmark next to command if in full screen mode.//void CMainFrame::OnUpdateViewFullScreen(CCmdUI* pCmdUI){     pCmdUI->SetCheck(FullScreenHandler.InFullScreenMode());}