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EnumTfCandidates.cpp
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EnumTfCandidates.cpp
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved
#include "private.h"
#include "EnumTfCandidates.h"
HRESULT CEnumTfCandidates::CreateInstance(_Out_ CEnumTfCandidates **ppobj, _In_ const CSampleImeArray<ITfCandidateString*> &rgelm, UINT currentNum)
{
if (ppobj == nullptr)
{
return E_INVALIDARG;
}
*ppobj = nullptr;
*ppobj = new (std::nothrow) CEnumTfCandidates(rgelm, currentNum);
if (*ppobj == nullptr)
{
return E_OUTOFMEMORY;
}
return S_OK;
}
HRESULT CEnumTfCandidates::CreateInstance(REFIID riid, _Out_ void **ppvObj, _In_ const CSampleImeArray<ITfCandidateString*> &rgelm, UINT currentNum)
{
if (ppvObj == nullptr)
{
return E_POINTER;
}
*ppvObj = nullptr;
*ppvObj = new (std::nothrow) CEnumTfCandidates(rgelm, currentNum);
if (*ppvObj == nullptr)
{
return E_OUTOFMEMORY;
}
return ((CEnumTfCandidates*)(*ppvObj))->QueryInterface(riid, ppvObj);
}
CEnumTfCandidates::CEnumTfCandidates(_In_ const CSampleImeArray<ITfCandidateString*> &rgelm, UINT currentNum)
{
_refCount = 0;
_rgelm = rgelm;
_currentCandidateStrIndex = currentNum;
}
CEnumTfCandidates::~CEnumTfCandidates()
{
}
//
// IUnknown methods
//
STDMETHODIMP CEnumTfCandidates::QueryInterface(REFIID riid, _Outptr_ void **ppvObj)
{
if (ppvObj == nullptr)
{
return E_POINTER;
}
*ppvObj = nullptr;
if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, __uuidof(IEnumTfCandidates)))
{
*ppvObj = (IEnumTfCandidates*)this;
}
if (*ppvObj == nullptr)
{
return E_NOINTERFACE;
}
AddRef();
return S_OK;
}
STDMETHODIMP_(ULONG) CEnumTfCandidates::AddRef()
{
return (ULONG)InterlockedIncrement(&_refCount);
}
STDMETHODIMP_(ULONG) CEnumTfCandidates::Release()
{
ULONG cRef = (ULONG)InterlockedDecrement(&_refCount);
if (0 < cRef)
{
return cRef;
}
delete this;
return 0;
}
//
// IEnumTfCandidates methods
//
STDMETHODIMP CEnumTfCandidates::Next(ULONG ulCount, _Out_ ITfCandidateString **ppObj, _Out_ ULONG *pcFetched)
{
ULONG fetched = 0;
if (ppObj == nullptr)
{
return E_INVALIDARG;
}
*ppObj = nullptr;
while ((fetched < ulCount) && (_currentCandidateStrIndex < _rgelm.Count()))
{
*ppObj = *_rgelm.GetAt(_currentCandidateStrIndex);
_currentCandidateStrIndex++;
fetched++;
}
if (pcFetched)
{
*pcFetched = fetched;
}
return (fetched == ulCount) ? S_OK : S_FALSE;
}
STDMETHODIMP CEnumTfCandidates::Skip(ULONG ulCount)
{
while ((0 < ulCount) && (_currentCandidateStrIndex < _rgelm.Count()))
{
_currentCandidateStrIndex++;
ulCount--;
}
return (0 < ulCount) ? S_FALSE : S_OK;
}
STDMETHODIMP CEnumTfCandidates::Reset()
{
_currentCandidateStrIndex = 0;
return S_OK;
}
STDMETHODIMP CEnumTfCandidates::Clone(_Out_ IEnumTfCandidates **ppEnum)
{
return CreateInstance(__uuidof(IEnumTfCandidates), (void**)ppEnum, _rgelm, _currentCandidateStrIndex);
}