// 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_NODE_DELEGATE_H_
#define MOJO_SERVICES_VIEW_MANAGER_NODE_DELEGATE_H_

#include "mojo/services/view_manager/view_manager_export.h"

namespace ui {
class Event;
}

namespace mojo {
namespace view_manager {
namespace service {

class Node;
class View;

class MOJO_VIEW_MANAGER_EXPORT NodeDelegate {
 public:
  // Invoked when the hierarchy has changed.
  virtual void OnNodeHierarchyChanged(const Node* node,
                                      const Node* new_parent,
                                      const Node* old_parent) = 0;

  // Invoked when the View associated with a node changes.
  virtual void OnNodeViewReplaced(const Node* node,
                                  const View* new_view,
                                  const View* old_view) = 0;

  // Invoked when an input event is received by the View at this node.
  virtual void OnViewInputEvent(const View* view,
                                const ui::Event* event) = 0;

 protected:
  virtual ~NodeDelegate() {}
};

}  // namespace service
}  // namespace view_manager
}  // namespace mojo

#endif  // MOJO_SERVICES_VIEW_MANAGER_NODE_DELEGATE_H_