diff -r 000000000000 -r 6474c204b198 dom/events/IMEContentObserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/events/IMEContentObserver.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et 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/. */
+
+#ifndef mozilla_IMEContentObserver_h_
+#define mozilla_IMEContentObserver_h_
+
+#include "mozilla/Attributes.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIDocShell.h" // XXX Why does only this need to be included here?
+#include "nsIReflowObserver.h"
+#include "nsISelectionListener.h"
+#include "nsIScrollObserver.h"
+#include "nsIWidget.h" // for nsIMEUpdatePreference
+#include "nsStubMutationObserver.h"
+#include "nsWeakReference.h"
+
+class nsIContent;
+class nsINode;
+class nsISelection;
+class nsPresContext;
+
+namespace mozilla {
+
+class EventStateManager;
+
+// IMEContentObserver notifies widget of any text and selection changes
+// in the currently focused editor
+class IMEContentObserver MOZ_FINAL : public nsISelectionListener,
+                                     public nsStubMutationObserver,
+                                     public nsIReflowObserver,
+                                     public nsIScrollObserver,
+                                     public nsSupportsWeakReference
+{
+public:
+  IMEContentObserver();
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(IMEContentObserver,
+                                           nsISelectionListener)
+  NS_DECL_NSISELECTIONLISTENER
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIREFLOWOBSERVER
+
+  // nsIScrollObserver
+  virtual void ScrollPositionChanged() MOZ_OVERRIDE;
+
+  void Init(nsIWidget* aWidget, nsPresContext* aPresContext,
+            nsIContent* aContent);
+  void Destroy();
+  /**
+   * IMEContentObserver is stored by EventStateManager during observing.
+   * DisconnectFromEventStateManager() is called when EventStateManager stops
+   * storing the instance.
+   */
+  void DisconnectFromEventStateManager();
+  bool IsManaging(nsPresContext* aPresContext, nsIContent* aContent);
+  bool IsEditorHandlingEventForComposition() const;
+  bool KeepAliveDuringDeactive() const
+  {
+    return mUpdatePreference.WantDuringDeactive();
+  }
+  nsIWidget* GetWidget() const { return mWidget; }
+  nsresult GetSelectionAndRoot(nsISelection** aSelection,
+                               nsIContent** aRoot) const;
+
+private:
+  void NotifyContentAdded(nsINode* aContainer, int32_t aStart, int32_t aEnd);
+  void ObserveEditableNode();
+
+  nsCOMPtr<nsIWidget> mWidget;
+  nsCOMPtr<nsISelection> mSelection;
+  nsCOMPtr<nsIContent> mRootContent;
+  nsCOMPtr<nsINode> mEditableNode;
+  nsCOMPtr<nsIDocShell> mDocShell;
+
+  EventStateManager* mESM;
+
+  nsIMEUpdatePreference mUpdatePreference;
+  uint32_t mPreAttrChangeLength;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_IMEContentObserver_h_