Tweaks to ViewManager:

mojo/services/view_manager/view_manager_connection.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SERVICES_VIEW_MANAGER_VIEW_MANAGER_CONNECTION_H_
 #define MOJO_SERVICES_VIEW_MANAGER_VIEW_MANAGER_CONNECTION_H_
 
 #include <set>
+#include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/containers/hash_tables.h"
 #include "mojo/public/cpp/shell/service.h"
 #include "mojo/services/public/interfaces/view_manager/view_manager.mojom.h"
 #include "mojo/services/view_manager/ids.h"
 #include "mojo/services/view_manager/node_delegate.h"
 #include "mojo/services/view_manager/view_manager_export.h"
 
 namespace mojo {
 namespace view_manager {
 namespace service {
 
@@ skipping 21 matching lines @@
 
   // Invoked when connection is established.
   void Initialize();
 
   // Returns the Node with the specified id.
   Node* GetNode(const NodeId& id);
 
   // Returns the View with the specified id.
   View* GetView(const ViewId& id);
 
-  // Notifies the client of a hierarchy change.
-  void NotifyNodeHierarchyChanged(const NodeId& node,
-                                  const NodeId& new_parent,
-                                  const NodeId& old_parent,
-                                  TransportChangeId server_change_id);
-  void NotifyNodeViewReplaced(const NodeId& node,
-                              const ViewId& new_view_id,
-                              const ViewId& old_view_id);
-  void NotifyNodeDeleted(const NodeId& node,
-                         TransportChangeId server_change_id);
-  void NotifyViewDeleted(const ViewId& view);
+  // The following methods are invoked after the corresponding change has been
+  // processed. They do the appropriate bookkeeping and update the client as
+  // necessary.
+  // TODO(sky): convert these to take Node*s.
+  void ProcessNodeHierarchyChanged(const NodeId& node_id,
+                                   const NodeId& new_parent_id,
+                                   const NodeId& old_parent_id,
+                                   TransportChangeId server_change_id,
+                                   bool originated_change);
+  void ProcessNodeViewReplaced(const NodeId& node,
+                               const ViewId& new_view_id,
+                               const ViewId& old_view_id,
+                               bool originated_change);
+  void ProcessNodeDeleted(const NodeId& node,
+                          TransportChangeId server_change_id,
+                          bool originated_change);
+  void ProcessViewDeleted(const ViewId& view, bool originated_change);
 
  private:
   typedef std::map<TransportConnectionSpecificNodeId, Node*> NodeMap;
   typedef std::map<TransportConnectionSpecificViewId, View*> ViewMap;
+  typedef base::hash_set<TransportNodeId> NodeIdSet;
 
   // Deletes a node owned by this connection. Returns true on success. |source|
   // is the connection that originated the change.
   bool DeleteNodeImpl(ViewManagerConnection* source, const NodeId& node_id);
 
   // Deletes a view owned by this connection. Returns true on success. |source|
   // is the connection that originated the change.
   bool DeleteViewImpl(ViewManagerConnection* source, const ViewId& view_id);
 
   // Sets the view associated with a node.
   bool SetViewImpl(const NodeId& node_id, const ViewId& view_id);
 
+  // If |node| is known (in |known_nodes_|) does nothing. Otherwise adds |node|
+  // to |nodes|, marks |node| as known and recurses.
+  void GetUnknownNodesFrom(Node* node, std::vector<Node*>* nodes);
+
+  // Returns true if notification should be sent of a hierarchy change. If true
+  // is returned, any nodes that need to be sent to the client are added to
+  // |to_send|.
+  bool ShouldNotifyOnHierarchyChange(const NodeId& node_id,
+                                     const NodeId& new_parent_id,
+                                     const NodeId& old_parent_id,
+                                     std::vector<Node*>* to_send);
+
   // Overridden from IViewManager:
   virtual void CreateNode(TransportNodeId transport_node_id,
                           const Callback<void(bool)>& callback) OVERRIDE;
   virtual void DeleteNode(TransportNodeId transport_node_id,
                           const Callback<void(bool)>& callback) OVERRIDE;
   virtual void AddNode(TransportNodeId parent_id,
                        TransportNodeId child_id,
                        TransportChangeId server_change_id,
                        const Callback<void(bool)>& callback) OVERRIDE;
   virtual void RemoveNodeFromParent(
@@ skipping 23 matching lines @@
                                   const ViewId& old_view_id) OVERRIDE;
 
   // Id of this connection as assigned by RootNodeManager. Assigned in
   // Initialize().
   TransportConnectionId id_;
 
   NodeMap node_map_;
 
   ViewMap view_map_;
 
+  // The set of nodes that has been communicated to the client.
+  NodeIdSet known_nodes_;
+
   DISALLOW_COPY_AND_ASSIGN(ViewManagerConnection);
 };
 
 #if defined(OS_WIN)
 #pragma warning(pop)
 #endif
 
 }  // namespace service
 }  // namespace view_manager
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_VIEW_MANAGER_CONNECTION_H_