BOOL CSampleIME::_FindComposingRange(TfEditCookie ec, _In_ ITfContext *pContext, _In_ ITfRange *pSelection, _Outptr_result_maybenull_ ITfRange **ppRange)
{
if (ppRange == nullptr)
{
return FALSE;
}
*ppRange = nullptr;
// find GUID_PROP_COMPOSING
ITfProperty* pPropComp = nullptr;
IEnumTfRanges* enumComp = nullptr;
/* GetProperty(GUID_PROP_COMPOSING, ...) -- nonzero if text is part of a composition */
HRESULT hr = pContext->GetProperty(GUID_PROP_COMPOSING, &pPropComp);
if (FAILED(hr) || pPropComp == nullptr)
{
return FALSE;
}
/* EnumRanges:
Obtains an enumeration of ranges that contain unique values of the property GUID_PROP_COMPOSING within the given range */
hr = pPropComp->EnumRanges(ec, &enumComp, pSelection);
if (FAILED(hr) || enumComp == nullptr)
{
pPropComp->Release();
return FALSE;
}
BOOL isCompExist = FALSE;
VARIANT var;
ULONG fetched = 0;
while (enumComp->Next(1, ppRange, &fetched) == S_OK && fetched == 1)
{
hr = pPropComp->GetValue(ec, *ppRange, &var);
if (hr == S_OK)
{
if (var.vt == VT_I4 && var.lVal != 0)
{
isCompExist = TRUE;
break;
}
}
(*ppRange)->Release();
*ppRange = nullptr;
}
pPropComp->Release();
enumComp->Release();
return isCompExist;
}
BOOL CDIME::_FindComposingRange(TfEditCookie ec, _In_ ITfContext *pContext, _In_ ITfRange *pSelection, _Outptr_result_maybenull_ ITfRange **ppRange)
{
debugPrint(L"CDIME::_FindComposingRange()");
if (pContext == nullptr || ppRange == nullptr)
{
debugPrint(L"CDIME::_FindComposingRange() failed with null pContext or pRange");
return FALSE;
}
*ppRange = nullptr;
// find GUID_PROP_COMPOSING
ITfProperty* pPropComp = nullptr;
IEnumTfRanges* enumComp = nullptr;
HRESULT hr = pContext->GetProperty(GUID_PROP_COMPOSING, &pPropComp);
if (FAILED(hr) || pPropComp == nullptr)
{
if (FAILED(hr))
debugPrint(L"CDIME::_FindComposingRange() pContext->GetProperty() failed");
else
debugPrint(L"CDIME::_FindComposingRange() failed with null pPropComp");
return FALSE;
}
hr = pPropComp->EnumRanges(ec, &enumComp, pSelection);
if (FAILED(hr) || enumComp == nullptr)
{
if (FAILED(hr))
debugPrint(L"CDIME::_FindComposingRange() pPropComp->EnumRanges failed");
else
debugPrint(L"CDIME::_FindComposingRange() failed with null enumComp");
pPropComp->Release();
return FALSE;
}
BOOL isCompExist = FALSE;
VARIANT var;
ULONG fetched = 0;
while (enumComp->Next(1, ppRange, &fetched) == S_OK && fetched == 1)
{
debugPrint(L"CDIME::_FindComposingRange() enumComp->Next() ");
hr = pPropComp->GetValue(ec, *ppRange, &var);
if (hr == S_OK)
{
if (var.vt == VT_I4 && var.lVal != 0)
{
WCHAR rangeText[4096];
rangeText[0] = NULL;
fetched = 0;
hr = (*ppRange)->GetText(ec, 0, rangeText, 4096, &fetched);
if (SUCCEEDED(hr))
{
if (lastReadingString.GetLength() > 0) // The last reading string is null when composing is just started and the range should be empty.
{
debugPrint(L"CDIME::_FindComposingRange() text in range = %s with %d character, last reading string = %s with %d characters",
rangeText, fetched, lastReadingString.Get(), lastReadingString.GetLength());
UINT cmpCount = (int)lastReadingString.GetLength();
BOOL rangeMatchReadingString = FALSE;
if (fetched > 0 && fetched > cmpCount)
{
LONG shifted = 0;
// range contains other characters than last reading string, and these characters should be skipped with shifting the start anchor
(*ppRange)->ShiftStart(ec, fetched - cmpCount, &shifted, NULL);
debugPrint(L"CDIME::_FindComposingRange() shift start anchor with %d characters", shifted);
rangeText[0] = NULL;
hr = (*ppRange)->GetText(ec, 0, rangeText, 4096, &fetched);
if (SUCCEEDED(hr))
debugPrint(L"CDIME::_FindComposingRange() text in range with shited anchor = %s with %d character", rangeText, fetched);
}
// The range we are composing should always matched with the last reading string.
rangeMatchReadingString = CompareString(GetLocale(), 0, rangeText, cmpCount, lastReadingString.Get(), cmpCount) == CSTR_EQUAL;
if (rangeMatchReadingString)
{
isCompExist = TRUE;
debugPrint(L"CDIME::_FindComposingRange() text in this range mathced with last reading string. isCompExist = TRUE");
break;
}
}
}
else
{
debugPrint(L"CDIME::_FindComposingRange() cannot getText from range isCompExist = TRUE");
}
}
}
debugPrint(L"CDIME::_FindComposingRange() release *ppRange");
if(*ppRange)
(*ppRange)->Release();
*ppRange = nullptr;
}
pPropComp->Release();
enumComp->Release();
return isCompExist;
}