Move window_manager service implementation to //services

mojo/services/window_manager/focus_rules.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_SERIVCES_WINDOW_MANAGER_FOCUS_RULES_H_
-#define MOJO_SERIVCES_WINDOW_MANAGER_FOCUS_RULES_H_
-
-#include "mojo/services/public/cpp/view_manager/types.h"
-#include "mojo/services/public/cpp/view_manager/view.h"
-
-namespace mojo {
-
-// Implemented by an object that establishes the rules about what can be
-// focused or activated.
-class FocusRules {
- public:
-  virtual ~FocusRules() {}
-
-  // Returns true if |view| is a toplevel view. Whether or not a view
-  // is considered toplevel is determined by a similar set of rules that
-  // govern activation and focus. Not all toplevel views are activatable,
-  // call CanActivateView() to determine if a view can be activated.
-  virtual bool IsToplevelView(View* view) const = 0;
-  // Returns true if |view| can be activated or focused.
-  virtual bool CanActivateView(View* view) const = 0;
-  // For CanFocusView(), null is supported, because null is a valid focusable
-  // view (in the case of clearing focus).
-  virtual bool CanFocusView(View* view) const = 0;
-
-  // Returns the toplevel view containing |view|. Not all toplevel views
-  // are activatable, call GetActivatableView() instead to return the
-  // activatable view, which might be in a different hierarchy.
-  // Will return null if |view| is not contained by a view considered to be
-  // a toplevel view.
-  virtual View* GetToplevelView(View* view) const = 0;
-  // Returns the activatable or focusable view given an attempt to activate or
-  // focus |view|. Some possible scenarios (not intended to be exhaustive):
-  // - |view| is a child of a non-focusable view and so focus must be set
-  //   according to rules defined by the delegate, e.g. to a parent.
-  // - |view| is an activatable view that is the transient parent of a modal
-  //   view, so attempts to activate |view| should result in the modal
-  //   transient being activated instead.
-  // These methods may return null if they are unable to find an activatable
-  // or focusable view given |view|.
-  virtual View* GetActivatableView(View* view) const = 0;
-  virtual View* GetFocusableView(View* view) const = 0;
-
-  // Returns the next view to activate in the event that |ignore| is no longer
-  // activatable. This function is called when something is happening to
-  // |ignore| that means it can no longer have focus or activation, including
-  // but not limited to:
-  // - it or its parent hierarchy is being hidden, or removed from the
-  //   RootView.
-  // - it is being destroyed.
-  // - it is being explicitly deactivated.
-  // |ignore| cannot be null.
-  virtual View* GetNextActivatableView(View* ignore) const = 0;
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_SERIVCES_WINDOW_MANAGER_FOCUS_RULES_H_