mojo/services/public/cpp/view_manager/view_manager_delegate.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_PUBLIC_CPP_VIEW_MANAGER_VIEW_MANAGER_DELEGATE_H_
#define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_MANAGER_DELEGATE_H_

namespace mojo {

class Node;
class ViewManager;

// Interface implemented by an application using the view manager.
class ViewManagerDelegate {
 public:
  // Called when the application implementing this interface is embedded at
  // |root|. |view_manager| is an implementation of an object bound to a
  // connection to the view manager service. The object is valid until
  // OnViewManagerDisconnected() is called with the same object.
  // This function is called for every embed, but there will be a unique
  // instance of |view_manager| only for every unique connection. See
  // the class description of ViewManager for some rules about when a new
  // connection is made.
  virtual void OnEmbed(ViewManager* view_manager, Node* root) = 0;

  // Called when a connection to the view manager service is closed.
  // |view_manager| is not valid after this function returns.
  virtual void OnViewManagerDisconnected(ViewManager* view_manager) = 0;

 protected:
  virtual ~ViewManagerDelegate() {}
};

}  // namespace mojo

#endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_MANAGER_DELEGATE_H_