Moves common code in ash/wm/overview to ash/common/wm/overview

ash/wm/overview/window_selector.h

-// Copyright 2013 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_WM_OVERVIEW_WINDOW_SELECTOR_H_
-#define ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-#include <set>
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "ash/common/wm_activation_observer.h"
-#include "ash/common/wm_window_observer.h"
-#include "base/macros.h"
-#include "base/time/time.h"
-#include "ui/display/display_observer.h"
-#include "ui/gfx/image/image_skia.h"
-#include "ui/views/controls/textfield/textfield_controller.h"
-
-namespace views {
-class Textfield;
-class Widget;
-}
-
-namespace ash {
-class WindowSelectorDelegate;
-class WindowSelectorItem;
-class WindowSelectorTest;
-class WindowGrid;
-
-// The WindowSelector shows a grid of all of your windows, allowing to select
-// one by clicking or tapping on it.
-class ASH_EXPORT WindowSelector : public display::DisplayObserver,
-                                  public WmWindowObserver,
-                                  public WmActivationObserver,
-                                  public views::TextfieldController {
- public:
-  // Returns true if the window can be selected in overview mode.
-  static bool IsSelectable(WmWindow* window);
-
-  enum Direction {
-    LEFT,
-    UP,
-    RIGHT,
-    DOWN
-  };
-
-  using WindowList = std::vector<WmWindow*>;
-
-  explicit WindowSelector(WindowSelectorDelegate* delegate);
-  ~WindowSelector() override;
-
-  // Initialize with the windows that can be selected.
-  void Init(const WindowList& windows);
-
-  // Perform cleanup that cannot be done in the destructor.
-  void Shutdown();
-
-  // Cancels window selection.
-  void CancelSelection();
-
-  // Called when the last window selector item from a grid is deleted.
-  void OnGridEmpty(WindowGrid* grid);
-
-  // Activates |window|.
-  void SelectWindow(WmWindow* window);
-
-  bool restoring_minimized_windows() const {
-    return restoring_minimized_windows_;
-  }
-
-  int text_filter_bottom() { return text_filter_bottom_; }
-
-  // display::DisplayObserver:
-  void OnDisplayAdded(const display::Display& display) override;
-  void OnDisplayRemoved(const display::Display& display) override;
-  void OnDisplayMetricsChanged(const display::Display& display,
-                               uint32_t metrics) override;
-
-  // WmWindowObserver:
-  void OnWindowTreeChanged(WmWindow* window,
-                           const TreeChangeParams& params) override;
-  void OnWindowDestroying(WmWindow* window) override;
-
-  // WmActivationObserver
-  void OnWindowActivated(WmWindow* gained_active,
-                         WmWindow* lost_active) override;
-  void OnAttemptToReactivateWindow(WmWindow* request_active,
-                                   WmWindow* actual_active) override;
-
-  // views::TextfieldController:
-  void ContentsChanged(views::Textfield* sender,
-                       const base::string16& new_contents) override;
-  bool HandleKeyEvent(views::Textfield* sender,
-                      const ui::KeyEvent& key_event) override;
-
- private:
-  friend class WindowSelectorTest;
-
-  // Returns the WmWindow for |text_filter_widget_|.
-  WmWindow* GetTextFilterWidgetWindow();
-
-  // Position all of the windows in the overview.
-  void PositionWindows(bool animate);
-
-  // Repositions and resizes |text_filter_widget_| on
-  // DisplayMetricsChanged event.
-  void RepositionTextFilterOnDisplayMetricsChange();
-
-  // |focus|, restores focus to the stored window.
-  void ResetFocusRestoreWindow(bool focus);
-
-  // Helper function that moves the selection widget to |direction| on the
-  // corresponding window grid.
-  void Move(Direction direction, bool animate);
-
-  // Removes all observers that were registered during construction and/or
-  // initialization.
-  void RemoveAllObservers();
-
-  // Tracks observed windows.
-  std::set<WmWindow*> observed_windows_;
-
-  // Weak pointer to the selector delegate which will be called when a
-  // selection is made.
-  WindowSelectorDelegate* delegate_;
-
-  // A weak pointer to the window which was focused on beginning window
-  // selection. If window selection is canceled the focus should be restored to
-  // this window.
-  WmWindow* restore_focus_window_;
-
-  // True when performing operations that may cause window activations. This is
-  // used to prevent handling the resulting expected activation.
-  bool ignore_activations_;
-
-  // List of all the window overview grids, one for each root window.
-  std::vector<std::unique_ptr<WindowGrid>> grid_list_;
-
-  // Tracks the index of the root window the selection widget is in.
-  size_t selected_grid_index_;
-
-  // The following variables are used for metric collection purposes. All of
-  // them refer to this particular overview session and are not cumulative:
-  // The time when overview was started.
-  base::Time overview_start_time_;
-
-  // The number of arrow key presses.
-  size_t num_key_presses_;
-
-  // The number of items in the overview.
-  size_t num_items_;
-
-  // Indicates if we are showing the selection widget.
-  bool showing_selection_widget_;
-
-  // Window text filter widget. As the user writes on it, we filter the items
-  // in the overview. It is also responsible for handling overview key events,
-  // such as enter key to select.
-  std::unique_ptr<views::Widget> text_filter_widget_;
-
-  // Image used for text filter textfield.
-  gfx::ImageSkia search_image_;
-
-  // The current length of the string entered into the text filtering textfield.
-  size_t text_filter_string_length_;
-
-  // The number of times the text filtering textfield has been cleared of text
-  // during this overview mode session.
-  size_t num_times_textfield_cleared_;
-
-  // Tracks whether minimized windows are currently being restored for overview
-  // mode.
-  bool restoring_minimized_windows_;
-
-  // The distance between the top edge of the screen and the bottom edge of
-  // the text filtering textfield.
-  int text_filter_bottom_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowSelector);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_