Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 205 insertions, 0 deletions

diff --git a/accessible/ipc/win/handler/AccessibleHandlerControl.cpp b/accessible/ipc/win/handler/AccessibleHandlerControl.cpp
new file mode 100644
index 0000000000..24324c1b5e
--- /dev/null
+++ b/accessible/ipc/win/handler/AccessibleHandlerControl.cpp
@@ -0,0 +1,205 @@
+/* -*- 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