CMDISplitterFrameImpl

template <class T,bool t_bVertical = true, class TBase = CMDIWindow, class TWinTraits = CFrameWinTraits>
class ATL_NO_VTABLE CMDISplitterFrameImpl : public CMDIFrameWindowImpl<T,TBase,TWinTraits>,
    public CSplitterImpl<T,t_bVertical>
{
    typedef CMDIFrameWindowImpl<T,CMDIWindow,TWinTraits> _BaseClass;
    typedef CSplitterImpl<T,t_bVertical > _splitter;
    typedef CMDISplitterFrameImpl<T,t_bVertical,TBase,TWinTraits> _ThisClass;
public:
    BEGIN_MSG_MAP(_ThisClass)
        MESSAGE_HANDLER(WM_CREATE,OnCreate)
        MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBackground)
        MESSAGE_HANDLER(WM_SIZE, OnSize)
        CHAIN_MSG_MAP(_splitter)
        CHAIN_MSG_MAP(_BaseClass)
    END_MSG_MAP()

    LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        _splitter::OnCreate(uMsg,wParam,lParam,bHandled);
        bHandled = FALSE;
        return 0;
    }

    LRESULT OnEraseBackground(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        // handled, no background painting needed
        return 1;
    }

    LRESULT OnSize(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        if(wParam != SIZE_MINIMIZED)
        {
            T* pT = static_cast<T*>(this);
            pT->UpdateLayout();
        }
        // message must be handled, otherwise DefFrameProc would resize the client again
        return 0;
    }

    void UpdateLayout(BOOL bResizeBars = TRUE)
    {
        RECT r = {0};

        GetClientRect(&r);
        UpdateBarsPosition(r,bResizeBars);
        SetSplitterRect(&r);
    }
};