import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

accessible/windows/msaa/ServiceProvider.cpp

@@ -0,0 +1,96 @@
+/* -*- 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/. */
+
+#include "ServiceProvider.h"
+
+#include "ApplicationAccessibleWrap.h"
+#include "Compatibility.h"
+#include "DocAccessible.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "Relation.h"
+#include "uiaRawElmProvider.h"
+
+#include "mozilla/Preferences.h"
+#include "nsIDocShell.h"
+
+#include "ISimpleDOMNode_i.c"
+
+namespace mozilla {
+namespace a11y {
+
+IMPL_IUNKNOWN_QUERY_HEAD(ServiceProvider)
+  IMPL_IUNKNOWN_QUERY_IFACE(IServiceProvider)
+IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAccessible)
+
+
+////////////////////////////////////////////////////////////////////////////////
+// IServiceProvider
+
+STDMETHODIMP
+ServiceProvider::QueryService(REFGUID aGuidService, REFIID aIID,
+                              void** aInstancePtr)
+{
+  if (!aInstancePtr)
+    return E_INVALIDARG;
+
+  *aInstancePtr = nullptr;
+
+  // UIA IAccessibleEx
+  if (aGuidService == IID_IAccessibleEx &&
+      Preferences::GetBool("accessibility.uia.enable")) {
+    uiaRawElmProvider* accEx = new uiaRawElmProvider(mAccessible);
+    HRESULT hr = accEx->QueryInterface(aIID, aInstancePtr);
+    if (FAILED(hr))
+      delete accEx;
+
+    return hr;
+  }
+
+  // Provide a special service ID for getting the accessible for the browser tab
+  // document that contains this accessible object. If this accessible object
+  // is not inside a browser tab then the service fails with E_NOINTERFACE.
+  // A use case for this is for screen readers that need to switch context or
+  // 'virtual buffer' when focus moves from one browser tab area to another.
+  static const GUID SID_IAccessibleContentDocument =
+    { 0xa5d8e1f3,0x3571,0x4d8f,{0x95,0x21,0x07,0xed,0x28,0xfb,0x07,0x2e} };
+  if (aGuidService == SID_IAccessibleContentDocument) {
+    if (aIID != IID_IAccessible)
+      return E_NOINTERFACE;
+
+    Relation rel = mAccessible->RelationByType(RelationType::CONTAINING_TAB_PANE);
+    AccessibleWrap* tabDoc = static_cast<AccessibleWrap*>(rel.Next());
+    if (!tabDoc)
+      return E_NOINTERFACE;
+
+    *aInstancePtr = static_cast<IAccessible*>(tabDoc);
+    (reinterpret_cast<IUnknown*>(*aInstancePtr))->AddRef();
+    return S_OK;
+  }
+
+  // Can get to IAccessibleApplication from any node via QS
+  if (aGuidService == IID_IAccessibleApplication ||
+      (Compatibility::IsJAWS() && aIID == IID_IAccessibleApplication)) {
+    ApplicationAccessibleWrap* applicationAcc =
+      static_cast<ApplicationAccessibleWrap*>(ApplicationAcc());
+    if (!applicationAcc)
+      return E_NOINTERFACE;
+
+    return applicationAcc->QueryInterface(aIID, aInstancePtr);
+  }
+
+  static const GUID IID_SimpleDOMDeprecated =
+    { 0x0c539790,0x12e4,0x11cf,{0xb6,0x61,0x00,0xaa,0x00,0x4c,0xd6,0xd8} };
+  if (aGuidService == IID_ISimpleDOMNode ||
+      aGuidService == IID_SimpleDOMDeprecated ||
+      aGuidService == IID_IAccessible ||  aGuidService == IID_IAccessible2)
+    return mAccessible->QueryInterface(aIID, aInstancePtr);
+
+  return E_INVALIDARG;
+}
+
+} // namespace a11y
+} // namespace mozilla