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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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108
accessible/windows/msaa/EnumVariant.cpp Normal file
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "EnumVariant.h"
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// ChildrenEnumVariant
////////////////////////////////////////////////////////////////////////////////
IMPL_IUNKNOWN_QUERY_HEAD(ChildrenEnumVariant)
IMPL_IUNKNOWN_QUERY_IFACE(IEnumVARIANT)
IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAnchorAcc)
STDMETHODIMP
ChildrenEnumVariant::Next(ULONG aCount, VARIANT FAR* aItems,
ULONG FAR* aCountFetched)
{
A11Y_TRYBLOCK_BEGIN
if (!aItems || !aCountFetched)
return E_INVALIDARG;
*aCountFetched = 0;
if (mAnchorAcc->IsDefunct() || mAnchorAcc->GetChildAt(mCurIndex) != mCurAcc)
return CO_E_OBJNOTCONNECTED;
ULONG countFetched = 0;
while (mCurAcc && countFetched < aCount) {
VariantInit(aItems + countFetched);
IDispatch* accNative = AccessibleWrap::NativeAccessible(mCurAcc);
++mCurIndex;
mCurAcc = mAnchorAcc->GetChildAt(mCurIndex);
// Don't output the accessible and count it as having been fetched unless
// it is non-null
MOZ_ASSERT(accNative);
if (!accNative) {
continue;
}
aItems[countFetched].pdispVal = accNative;
aItems[countFetched].vt = VT_DISPATCH;
++countFetched;
}
(*aCountFetched) = countFetched;
return countFetched < aCount ? S_FALSE : S_OK;
A11Y_TRYBLOCK_END
}
STDMETHODIMP
ChildrenEnumVariant::Skip(ULONG aCount)
{
A11Y_TRYBLOCK_BEGIN
if (mAnchorAcc->IsDefunct() || mAnchorAcc->GetChildAt(mCurIndex) != mCurAcc)
return CO_E_OBJNOTCONNECTED;
mCurIndex += aCount;
mCurAcc = mAnchorAcc->GetChildAt(mCurIndex);
return mCurAcc ? S_OK : S_FALSE;
A11Y_TRYBLOCK_END
}
STDMETHODIMP
ChildrenEnumVariant::Reset()
{
A11Y_TRYBLOCK_BEGIN
if (mAnchorAcc->IsDefunct())
return CO_E_OBJNOTCONNECTED;
mCurIndex = 0;
mCurAcc = mAnchorAcc->GetChildAt(0);
return S_OK;
A11Y_TRYBLOCK_END
}
STDMETHODIMP
ChildrenEnumVariant::Clone(IEnumVARIANT** aEnumVariant)
{
A11Y_TRYBLOCK_BEGIN
if (!aEnumVariant)
return E_INVALIDARG;
*aEnumVariant = new ChildrenEnumVariant(*this);
(*aEnumVariant)->AddRef();
return S_OK;
A11Y_TRYBLOCK_END
}