CEnumIDListBase.h

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/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifndef __ENUMIDLIST_H__
#define __ENUMIDLIST_H__
 
struct ENUMLIST
{
    ENUMLIST                *pNext;
    LPITEMIDLIST            pidl;
};
 
class CEnumIDListBase :
    public CComObjectRootEx<CComMultiThreadModelNoCS>,
    public IEnumIDList
{
protected:
    ENUMLIST                *mpFirst;
    ENUMLIST                *mpLast;
    ENUMLIST                *mpCurrent;
public:
    CEnumIDListBase();
    virtual ~CEnumIDListBase();
    BOOL AddToEnumList(LPITEMIDLIST pidl);
    BOOL DeleteList();
    BOOL HasItemWithCLSID(LPITEMIDLIST pidl);
    HRESULT AppendItemsFromEnumerator(IEnumIDList* pEnum);
 
    template <class T> BOOL HasItemWithCLSIDImpl(LPCITEMIDLIST pidl)
    {
        const CLSID * const pClsid = static_cast<T*>(this)->GetPidlClsid((PCUITEMID_CHILD)pidl);
        for (ENUMLIST *pCur = mpFirst; pClsid && pCur; pCur = pCur->pNext)
        {
            const CLSID * const pEnumClsid = static_cast<T*>(this)->GetPidlClsid((PCUITEMID_CHILD)pCur->pidl);
            if (pEnumClsid && IsEqualCLSID(*pClsid, *pEnumClsid))
                return TRUE;
        }
        return FALSE;
    }
 
    // *** IEnumIDList methods ***
    STDMETHOD(Next)(ULONG celt, LPITEMIDLIST *rgelt, ULONG *pceltFetched) override;
    STDMETHOD(Skip)(ULONG celt) override;
    STDMETHOD(Reset)() override;
    STDMETHOD(Clone)(IEnumIDList **ppenum) override;
 
BEGIN_COM_MAP(CEnumIDListBase)
    COM_INTERFACE_ENTRY_IID(IID_IEnumIDList, IEnumIDList)
END_COM_MAP()
};
 
#endif /* __ENUMIDLIST_H__ */