1 files changed, 155 insertions, 0 deletions
diff --git a/accessible/windows/msaa/AccessibleWrap.cpp b/accessible/windows/msaa/AccessibleWrap.cpp
new file mode 100644
index 0000000000..f29be782e6
--- /dev/null
+++ b/accessible/windows/msaa/AccessibleWrap.cpp
@@ -0,0 +1,155 @@
+/* -*- 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 "AccessibleWrap.h"
+
+#include "mozilla/a11y/DocAccessibleParent.h"
+#include "AccEvent.h"
+#include "nsAccUtils.h"
+#include "nsIAccessibleEvent.h"
+#include "nsIWidget.h"
+#include "nsWindowsHelpers.h"
+#include "mozilla/a11y/HyperTextAccessible.h"
+#include "mozilla/a11y/RemoteAccessible.h"
+#include "ServiceProvider.h"
+#include "sdnAccessible.h"
+#include "LocalAccessible-inl.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+/* For documentation of the accessibility architecture,
+ * see http://lxr.mozilla.org/seamonkey/source/accessible/accessible-docs.html
+ */
+
+////////////////////////////////////////////////////////////////////////////////
+// AccessibleWrap
+////////////////////////////////////////////////////////////////////////////////
+AccessibleWrap::AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc)
+    : LocalAccessible(aContent, aDoc) {}
+
+NS_IMPL_ISUPPORTS_INHERITED0(AccessibleWrap, LocalAccessible)
+
+void AccessibleWrap::Shutdown() {
+  if (mMsaa) {
+    mMsaa->MsaaShutdown();
+    // Don't release mMsaa here because this will cause its id to be released
+    // immediately, which will result in immediate reuse, causing problems
+    // for clients. Instead, we release it in the destructor.
+  }
+  LocalAccessible::Shutdown();
+}
+
+//-----------------------------------------------------
+// IUnknown interface methods - see iunknown.h for documentation
+//-----------------------------------------------------
+
+MsaaAccessible* AccessibleWrap::GetMsaa() {
+  if (!mMsaa) {
+    mMsaa = MsaaAccessible::Create(this);
+  }
+  return mMsaa;
+}
+
+void AccessibleWrap::GetNativeInterface(void** aOutAccessible) {
+  RefPtr<IAccessible> result = GetMsaa();
+  return result.forget(aOutAccessible);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible
+
+nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
+  nsresult rv = LocalAccessible::HandleAccEvent(aEvent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (IPCAccessibilityActive()) {
+    return NS_OK;
+  }
+
+  uint32_t eventType = aEvent->GetEventType();
+
+  // Means we're not active.
+  NS_ENSURE_TRUE(!IsDefunct(), NS_ERROR_FAILURE);
+
+  LocalAccessible* accessible = aEvent->GetAccessible();
+  if (!accessible) return NS_OK;
+
+  if (eventType == nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED ||
+      eventType == nsIAccessibleEvent::EVENT_FOCUS) {
+    UpdateSystemCaretFor(accessible);
+  }
+
+  MsaaAccessible::FireWinEvent(accessible, eventType);
+
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AccessibleWrap
+
+//------- Helper methods ---------
+
+bool AccessibleWrap::IsRootForHWND() {
+  if (IsRoot()) {
+    return true;
+  }
+  HWND thisHwnd = MsaaAccessible::GetHWNDFor(this);
+  AccessibleWrap* parent = static_cast<AccessibleWrap*>(LocalParent());
+  MOZ_ASSERT(parent);
+  HWND parentHwnd = MsaaAccessible::GetHWNDFor(parent);
+  return thisHwnd != parentHwnd;
+}
+
+void AccessibleWrap::UpdateSystemCaretFor(LocalAccessible* aAccessible) {
+  // Move the system caret so that Windows Tablet Edition and tradional ATs with
+  // off-screen model can follow the caret
+  ::DestroyCaret();
+
+  HyperTextAccessible* text = aAccessible->AsHyperText();
+  if (!text) return;
+
+  nsIWidget* widget = nullptr;
+  LayoutDeviceIntRect caretRect = text->GetCaretRect(&widget);
+
+  if (!widget) {
+    return;
+  }
+
+  HWND caretWnd =
+      reinterpret_cast<HWND>(widget->GetNativeData(NS_NATIVE_WINDOW));
+  UpdateSystemCaretFor(caretWnd, caretRect);
+}
+
+/* static */
+void AccessibleWrap::UpdateSystemCaretFor(
+    RemoteAccessible* aProxy, const LayoutDeviceIntRect& aCaretRect) {
+  ::DestroyCaret();
+
+  // The HWND should be the real widget HWND, not an emulated HWND.
+  // We get the HWND from the proxy's outer doc to bypass window emulation.
+  LocalAccessible* outerDoc = aProxy->OuterDocOfRemoteBrowser();
+  UpdateSystemCaretFor(MsaaAccessible::GetHWNDFor(outerDoc), aCaretRect);
+}
+
+/* static */
+void AccessibleWrap::UpdateSystemCaretFor(
+    HWND aCaretWnd, const LayoutDeviceIntRect& aCaretRect) {
+  if (!aCaretWnd || aCaretRect.IsEmpty()) {
+    return;
+  }
+
+  // Create invisible bitmap for caret, otherwise its appearance interferes
+  // with Gecko caret
+  nsAutoBitmap caretBitMap(CreateBitmap(1, aCaretRect.Height(), 1, 1, nullptr));
+  if (::CreateCaret(aCaretWnd, caretBitMap, 1,
+                    aCaretRect.Height())) {  // Also destroys the last caret
+    ::ShowCaret(aCaretWnd);
+    POINT clientPoint{aCaretRect.X(), aCaretRect.Y()};
+    ::ScreenToClient(aCaretWnd, &clientPoint);
+    ::SetCaretPos(clientPoint.x, clientPoint.y);
+  }
+}