Move mus to //services/ui

components/mus/ws/focus_controller.h

-// Copyright 2015 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 COMPONENTS_MUS_WS_FOCUS_CONTROLLER_H_
-#define COMPONENTS_MUS_WS_FOCUS_CONTROLLER_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "components/mus/ws/server_window_drawn_tracker_observer.h"
-#include "components/mus/ws/server_window_tracker.h"
-
-namespace mus {
-
-namespace ws {
-
-class FocusControllerDelegate;
-class FocusControllerObserver;
-class ServerWindow;
-class ServerWindowDrawnTracker;
-struct WindowId;
-
-// Describes the source of the change.
-enum class FocusControllerChangeSource {
-  EXPLICIT,
-  DRAWN_STATE_CHANGED,
-};
-
-// Tracks the focused window. Focus is moved to another window when the drawn
-// state of the focused window changes.
-class FocusController : public ServerWindowDrawnTrackerObserver {
- public:
-  FocusController(FocusControllerDelegate* delegate, ServerWindow* root);
-  ~FocusController() override;
-
-  // Sets the focused window. Does nothing if |window| is currently focused.
-  // This does not notify the delegate. See ServerWindow::SetFocusedWindow()
-  // for details on return value.
-  bool SetFocusedWindow(ServerWindow* window);
-  ServerWindow* GetFocusedWindow();
-
-  // Moves activation to the next activatable window.
-  void ActivateNextWindow();
-
-  void AddObserver(FocusControllerObserver* observer);
-  void RemoveObserver(FocusControllerObserver* observer);
-
- private:
-  enum class ActivationChangeReason {
-    UNKNONW,
-    CYCLE,  // Activation changed because of ActivateNextWindow().
-    FOCUS,  // Focus change required a different window to be activated.
-    DRAWN_STATE_CHANGED,  // Active window was hidden or destroyed.
-  };
-  void SetActiveWindow(ServerWindow* window, ActivationChangeReason reason);
-
-  // Returns whether |window| can be focused or activated.
-  bool CanBeFocused(ServerWindow* window) const;
-  bool CanBeActivated(ServerWindow* window) const;
-
-  // Returns the closest activatable ancestor of |window|. Returns nullptr if
-  // there is no such ancestor.
-  ServerWindow* GetActivatableAncestorOf(ServerWindow* window) const;
-
-  // Implementation of SetFocusedWindow().
-  bool SetFocusedWindowImpl(FocusControllerChangeSource change_source,
-                            ServerWindow* window);
-
-  // ServerWindowDrawnTrackerObserver:
-  void OnDrawnStateWillChange(ServerWindow* ancestor,
-                              ServerWindow* window,
-                              bool is_drawn) override;
-  void OnDrawnStateChanged(ServerWindow* ancestor,
-                           ServerWindow* window,
-                           bool is_drawn) override;
-
-  FocusControllerDelegate* delegate_;
-
-  ServerWindow* root_;
-  ServerWindow* focused_window_;
-  ServerWindow* active_window_;
-  // Tracks what caused |active_window_| to be activated.
-  ActivationChangeReason activation_reason_;
-
-  // Keeps track of the list of windows that have already been visited during a
-  // window cycle. This is only active when |activation_reason_| is set to
-  // CYCLE.
-  std::unique_ptr<ServerWindowTracker> cycle_windows_;
-
-  base::ObserverList<FocusControllerObserver> observers_;
-
-  // Keeps track of the visibility of the focused and active window.
-  std::unique_ptr<ServerWindowDrawnTracker> drawn_tracker_;
-
-  DISALLOW_COPY_AND_ASSIGN(FocusController);
-};
-
-}  // namespace ws
-
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_WS_FOCUS_CONTROLLER_H_