chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/window_cycle_list.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 ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_
-#define ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_
-
-#include <memory>
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "ash/common/wm/window_cycle_controller.h"
-#include "base/macros.h"
-#include "base/scoped_observer.h"
-#include "base/timer/timer.h"
-#include "ui/aura/window_observer.h"
-#include "ui/display/display_observer.h"
-
-namespace display {
-class Screen;
-}
-
-namespace views {
-class Widget;
-}
-
-namespace ash {
-
-class WindowCycleView;
-
-// Tracks a set of Windows that can be stepped through. This class is used by
-// the WindowCycleController.
-class ASH_EXPORT WindowCycleList : public aura::WindowObserver,
-                                   public display::DisplayObserver {
- public:
-  using WindowList = std::vector<WmWindow*>;
-
-  explicit WindowCycleList(const WindowList& windows);
-  ~WindowCycleList() override;
-
-  bool empty() const { return windows_.empty(); }
-
-  // Cycles to the next or previous window based on |direction|.
-  void Step(WindowCycleController::Direction direction);
-
-  int current_index() const { return current_index_; }
-
-  void set_user_did_accept(bool user_did_accept) {
-    user_did_accept_ = user_did_accept;
-  }
-
- private:
-  friend class WindowCycleControllerTest;
-
-  static void DisableInitialDelayForTesting();
-  const views::Widget* widget() const { return cycle_ui_widget_; }
-
-  const WindowList& windows() const { return windows_; }
-
-  // aura::WindowObserver overrides:
-  // There is a chance a window is destroyed, for example by JS code. We need to
-  // take care of that even if it is not intended for the user to close a window
-  // while window cycling.
-  void OnWindowDestroying(aura::Window* window) override;
-
-  // display::DisplayObserver overrides:
-  void OnDisplayAdded(const display::Display& new_display) override;
-  void OnDisplayRemoved(const display::Display& old_display) override;
-  void OnDisplayMetricsChanged(const display::Display& display,
-                               uint32_t changed_metrics) override;
-
-  // Returns true if the window list overlay should be shown.
-  bool ShouldShowUi();
-
-  // Initializes and shows |cycle_view_|.
-  void InitWindowCycleView();
-
-  // List of weak pointers to windows to use while cycling with the keyboard.
-  // List is built when the user initiates the gesture (i.e. hits alt-tab the
-  // first time) and is emptied when the gesture is complete (i.e. releases the
-  // alt key).
-  WindowList windows_;
-
-  // Current position in the |windows_|. Can be used to query selection depth,
-  // i.e., the position of an active window in a global MRU ordering.
-  int current_index_ = 0;
-
-  // True if the user accepted the window switch (as opposed to cancelling or
-  // interrupting the interaction).
-  bool user_did_accept_ = false;
-
-  // The top level View for the window cycle UI. May be null if the UI is not
-  // showing.
-  WindowCycleView* cycle_view_ = nullptr;
-
-  // The widget that hosts the window cycle UI.
-  views::Widget* cycle_ui_widget_ = nullptr;
-
-  // The window list will dismiss if the display metrics change.
-  ScopedObserver<display::Screen, display::DisplayObserver> screen_observer_;
-
-  // A timer to delay showing the UI. Quick Alt+Tab should not flash a UI.
-  base::OneShotTimer show_ui_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowCycleList);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_