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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=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/. */
#if defined(MOZILLA_INTERNAL_API)
# error This code is NOT for internal Gecko use!
#endif // defined(MOZILLA_INTERNAL_API)
#include "AccessibleHandlerControl.h"
#include <utility>
#include "AccessibleEventId.h"
#include "AccessibleHandler.h"
#include "mozilla/RefPtr.h"
namespace mozilla {
namespace a11y {
mscom::SingletonFactory<AccessibleHandlerControl> gControlFactory;
namespace detail {
TextChange::TextChange() : mIA2UniqueId(0), mIsInsert(false), mText() {}
TextChange::TextChange(long aIA2UniqueId, bool aIsInsert,
NotNull<IA2TextSegment*> aText)
: mIA2UniqueId(aIA2UniqueId),
mIsInsert(aIsInsert),
mText{BSTRCopy(aText->text), aText->start, aText->end} {}
TextChange::TextChange(TextChange&& aOther) : mText() {
*this = std::move(aOther);
}
TextChange::TextChange(const TextChange& aOther) : mText() { *this = aOther; }
TextChange& TextChange::operator=(TextChange&& aOther) {
mIA2UniqueId = aOther.mIA2UniqueId;
mIsInsert = aOther.mIsInsert;
aOther.mIA2UniqueId = 0;
::SysFreeString(mText.text);
mText = aOther.mText;
aOther.mText.text = nullptr;
return *this;
}
TextChange& TextChange::operator=(const TextChange& aOther) {
mIA2UniqueId = aOther.mIA2UniqueId;
mIsInsert = aOther.mIsInsert;
::SysFreeString(mText.text);
mText = {BSTRCopy(aOther.mText.text), aOther.mText.start, aOther.mText.end};
return *this;
}
TextChange::~TextChange() { ::SysFreeString(mText.text); }
HRESULT
TextChange::GetOld(long aIA2UniqueId, NotNull<IA2TextSegment*> aOutOldSegment) {
if (mIsInsert || aIA2UniqueId != mIA2UniqueId) {
return S_OK;
}
return SegCopy(*aOutOldSegment, mText);
}
HRESULT
TextChange::GetNew(long aIA2UniqueId, NotNull<IA2TextSegment*> aOutNewSegment) {
if (!mIsInsert || aIA2UniqueId != mIA2UniqueId) {
return S_OK;
}
return SegCopy(*aOutNewSegment, mText);
}
/* static */
BSTR TextChange::BSTRCopy(const BSTR& aIn) {
return ::SysAllocStringLen(aIn, ::SysStringLen(aIn));
}
/* static */
HRESULT TextChange::SegCopy(IA2TextSegment& aDest, const IA2TextSegment& aSrc) {
aDest = {BSTRCopy(aSrc.text), aSrc.start, aSrc.end};
if (aSrc.text && !aDest.text) {
return E_OUTOFMEMORY;
}
if (!::SysStringLen(aDest.text)) {
return S_FALSE;
}
return S_OK;
}
} // namespace detail
HRESULT
AccessibleHandlerControl::Create(AccessibleHandlerControl** aOutObject) {
if (!aOutObject) {
return E_INVALIDARG;
}
RefPtr<AccessibleHandlerControl> ctl(new AccessibleHandlerControl());
ctl.forget(aOutObject);
return S_OK;
}
AccessibleHandlerControl::AccessibleHandlerControl()
: mIsRegistered(false),
mCacheGen(0),
mIA2Proxy(mscom::RegisterProxy(L"ia2marshal.dll")),
mHandlerProxy(mscom::RegisterProxy()) {
MOZ_ASSERT(mIA2Proxy);
}
IMPL_IUNKNOWN1(AccessibleHandlerControl, IHandlerControl)
HRESULT
AccessibleHandlerControl::Invalidate() {
++mCacheGen;
// We can't just call mAccessibleCache.clear() because doing so would release
// remote objects, making remote COM calls. Since this is an STA, an incoming
// COM call might be handled which might marshal an AccessibleHandler,
// which in turn might add itself to mAccessibleCache. Since we'd be in the
// middle of mutating mAccessibleCache, that might cause a crash. Instead,
// swap mAccessibleCache into a temporary map first, which will empty
// mAccessibleCache without releasing remote objects. Once mAccessibleCache
// is empty, it's safe to let the temporary map be destroyed when it goes
// out of scope. Remote calls will be made, but nothing will re-enter
// the temporary map while it's being destroyed.
AccessibleCache oldCache;
mAccessibleCache.swap(oldCache);
return S_OK;
}
HRESULT
AccessibleHandlerControl::OnTextChange(long aHwnd, long aIA2UniqueId,
VARIANT_BOOL aIsInsert,
IA2TextSegment* aText) {
if (!aText) {
return E_INVALIDARG;
}
mTextChange = detail::TextChange(aIA2UniqueId, aIsInsert, WrapNotNull(aText));
NotifyWinEvent(aIsInsert ? IA2_EVENT_TEXT_INSERTED : IA2_EVENT_TEXT_REMOVED,
reinterpret_cast<HWND>(static_cast<uintptr_t>(aHwnd)),
OBJID_CLIENT, aIA2UniqueId);
return S_OK;
}
HRESULT
AccessibleHandlerControl::GetNewText(long aIA2UniqueId,
NotNull<IA2TextSegment*> aOutNewText) {
return mTextChange.GetNew(aIA2UniqueId, aOutNewText);
}
HRESULT
AccessibleHandlerControl::GetOldText(long aIA2UniqueId,
NotNull<IA2TextSegment*> aOutOldText) {
return mTextChange.GetOld(aIA2UniqueId, aOutOldText);
}
HRESULT
AccessibleHandlerControl::GetHandlerTypeInfo(ITypeInfo** aOutTypeInfo) {
if (!mHandlerProxy) {
return E_UNEXPECTED;
}
return mHandlerProxy->GetTypeInfoForGuid(CLSID_AccessibleHandler,
aOutTypeInfo);
}
HRESULT
AccessibleHandlerControl::Register(NotNull<IGeckoBackChannel*> aGecko) {
if (mIsRegistered) {
return S_OK;
}
long pid = static_cast<long>(::GetCurrentProcessId());
HRESULT hr = aGecko->put_HandlerControl(pid, this);
mIsRegistered = SUCCEEDED(hr);
MOZ_ASSERT(mIsRegistered);
return hr;
}
void AccessibleHandlerControl::CacheAccessible(long aUniqueId,
AccessibleHandler* aAccessible) {
MOZ_ASSERT(aUniqueId && aAccessible);
mAccessibleCache[aUniqueId] = aAccessible;
}
HRESULT AccessibleHandlerControl::GetCachedAccessible(
long aUniqueId, AccessibleHandler** aAccessible) {
MOZ_ASSERT(aUniqueId && aAccessible);
auto it = mAccessibleCache.find(aUniqueId);
if (it == mAccessibleCache.end()) {
return E_INVALIDARG;
}
RefPtr<AccessibleHandler> ref = it->second;
ref.forget(aAccessible);
return S_OK;
}
} // namespace a11y
} // namespace mozilla
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