VC实现可定制菜单栏：移动、停靠与最小化功能

VC菜单栏像工具栏一样可移动停靠且有最小化等按钮
http://www.codeguru.com/Cpp/controls/menu/dockablemenus/article.php/c3723/
Single Class DevStudio-Like Menu Bar
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Alagesan. M.K. (view profile)
August 28, 2003

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Home site www.spunge.com/~alagesan

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Environment: VC5, Windows NT4 SP3, Windows 9x and above
Single Class Plug & Play DevStudio-Like MFC Menu Bar

CMenuBar is simple Menubar Control that can be integrated into any MDI MFC application by making a few changes in CMainFrame. The simplicity of the CMenuBar is that it uses the Windows Menu system to show a popup menu. It only overrides the CalcDynamicLayout() function to make the Menu Bar resizable docking bar. It simulates all the behaviour of a Windows menu system and menu messages such as WM_MENUCHAR, WM_INITMENU, WM_INITPOPUPMENU, WM_MENUSELECT, and so forth. The MenuBar is UniCode ready.

The CMenuBar class is derived from the CControlBar class. To make it dock and float like a DevStudio Menu Bar, the functions of CControlBar are overridden.
Function  Description
Create()  Initializes Menu Bar
CalcDynamicLayout()  Calculates Menu Bar layout
OnUpdateCmdUI()  Checks change of Menu Bar position and size, and to disable the Close button when floating

The CMenuBar subclasses the CMainFrame and MDIClient windows in the SubClassMDI() function, where it also removes the main and refresh menus of CMainFrame to shift it to the MenuBar control.

VOID CMenuBar::SubClassMDI( CWnd* pMainFrame )
{
    g_pMenuBar = this;
    m_pMainFrame = (CMDIFrameWnd*)pMainFrame;

    /// Type cast to retrieve the protected members
    /// m_hWndMDIClient, m_hMenuDefault
    _CMBMDIFrameWnd* _pMainFrame = (_CMBMDIFrameWnd*)pMainFrame;
    HWND hwndClient = _pMainFrame->m_hWndMDIClient;
    HMENU hmnuMDIMainDef = _pMainFrame->m_hMenuDefault;

    /// Subclass MainFrame and MDIClient Windows
    _gs_pfnMDIFrameProc = (WNDPROC)::SetWindowLong
                                     ( m_pMainFrame->m_hWnd,
                                       GWL_WNDPROC,
                                       (DWORD)_MDIFrameProc );
    _gs_pfnMDIClientProc = (WNDPROC)::SetWindowLong
                                      ( hwndClient, GWL_WNDPROC,
                                        (DWORD)_MDIClientProc );