Restructure public side of view_manager service.

mojo/services/public/cpp/view_manager/view_observer.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_OBSERVER_H_
-#define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-
-#include "mojo/services/public/cpp/view_manager/view.h"
-#include "mojo/services/public/interfaces/input_events/input_events.mojom.h"
-
-namespace mojo {
-
-class View;
-
-// A note on -ing and -ed suffixes:
-//
-// -ing methods are called before changes are applied to the local view model.
-// -ed methods are called after changes are applied to the local view model.
-//
-// If the change originated from another connection to the view manager, it's
-// possible that the change has already been applied to the service-side model
-// prior to being called, so for example in the case of OnViewDestroying(), it's
-// possible the view has already been destroyed on the service side.
-
-class ViewObserver {
- public:
-  struct TreeChangeParams {
-    TreeChangeParams();
-    View* target;
-    View* old_parent;
-    View* new_parent;
-    View* receiver;
-  };
-
-  virtual void OnTreeChanging(const TreeChangeParams& params) {}
-  virtual void OnTreeChanged(const TreeChangeParams& params) {}
-
-  virtual void OnViewReordering(View* view,
-                                View* relative_view,
-                                OrderDirection direction) {}
-  virtual void OnViewReordered(View* view,
-                               View* relative_view,
-                               OrderDirection direction) {}
-
-  virtual void OnViewDestroying(View* view) {}
-  virtual void OnViewDestroyed(View* view) {}
-
-  virtual void OnViewBoundsChanging(View* view,
-                                    const Rect& old_bounds,
-                                    const Rect& new_bounds) {}
-  virtual void OnViewBoundsChanged(View* view,
-                                   const Rect& old_bounds,
-                                   const Rect& new_bounds) {}
-
-  virtual void OnViewFocusChanged(View* gained_focus, View* lost_focus) {}
-
-  virtual void OnViewInputEvent(View* view, const EventPtr& event) {}
-
-  virtual void OnViewVisibilityChanging(View* view) {}
-  virtual void OnViewVisibilityChanged(View* view) {}
-
-  // Invoked when this View's shared properties have changed. This can either
-  // be caused by SetSharedProperty() being called locally, or by us receiving
-  // a mojo message that this property has changed. If this property has been
-  // added, |old_data| is null. If this property was removed, |new_data| is
-  // null.
-  virtual void OnViewSharedPropertyChanged(
-      View* view,
-      const std::string& name,
-      const std::vector<uint8_t>* old_data,
-      const std::vector<uint8_t>* new_data) {}
-
-  // Invoked when SetProperty() or ClearProperty() is called on the window.
-  // |key| is either a WindowProperty<T>* (SetProperty, ClearProperty). Either
-  // way, it can simply be compared for equality with the property
-  // constant. |old| is the old property value, which must be cast to the
-  // appropriate type before use.
-  virtual void OnViewLocalPropertyChanged(
-      View* view,
-      const void* key,
-      intptr_t old) {}
-
-  virtual void OnViewEmbeddedAppDisconnected(View* view) {}
-
-  // Sent when the drawn state changes. This is only sent for the root nodes
-  // when embedded.
-  virtual void OnViewDrawnChanging(View* view) {}
-  virtual void OnViewDrawnChanged(View* view) {}
-
- protected:
-  virtual ~ViewObserver() {}
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_OBSERVER_H_