Refactors MultiWindowResizeController to use ash/wm/common

ash/wm/workspace/multi_window_resize_controller.h

-// Copyright (c) 2012 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_WORKSPACE_MULTI_WINDOW_RESIZE_CONTROLLER_H_
-#define ASH_WM_WORKSPACE_MULTI_WINDOW_RESIZE_CONTROLLER_H_
-
-#include <memory>
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "base/timer/timer.h"
-#include "ui/aura/window_observer.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/views/mouse_watcher.h"
-
-namespace aura {
-class Window;
-}
-
-namespace views {
-class Widget;
-}
-
-namespace ash {
-class MultiWindowResizeControllerTest;
-class WorkspaceWindowResizer;
-
-// Two directions resizes happen in.
-enum Direction {
-  TOP_BOTTOM,
-  LEFT_RIGHT,
-};
-
-// MultiWindowResizeController is responsible for determining and showing a
-// widget that allows resizing multiple windows at the same time.
-// MultiWindowResizeController is driven by WorkspaceEventFilter.
-class ASH_EXPORT MultiWindowResizeController :
-    public views::MouseWatcherListener, public aura::WindowObserver {
- public:
-  MultiWindowResizeController();
-  ~MultiWindowResizeController() override;
-
-  // If necessary, shows the resize widget. |window| is the window the mouse
-  // is over, |component| the edge and |point| the location of the mouse.
-  void Show(aura::Window* window, int component, const gfx::Point& point);
-
-  // Hides the resize widget.
-  void Hide();
-
-  // MouseWatcherListenre overrides:
-  void MouseMovedOutOfHost() override;
-
-  // WindowObserver overrides:
-  void OnWindowDestroying(aura::Window* window) override;
-
- private:
-  friend class MultiWindowResizeControllerTest;
-
-  // Used to track the two resizable windows and direction.
-  struct ResizeWindows {
-    ResizeWindows();
-    ResizeWindows(const ResizeWindows& other);
-    ~ResizeWindows();
-
-    // Returns true if |other| equals this ResizeWindows. This does *not*
-    // consider the windows in |other_windows|.
-    bool Equals(const ResizeWindows& other) const;
-
-    // Returns true if this ResizeWindows is valid.
-    bool is_valid() const { return window1 && window2; }
-
-    // The left/top window to resize.
-    aura::Window* window1;
-
-    // Other window to resize.
-    aura::Window* window2;
-
-    // Direction
-    Direction direction;
-
-    // Windows after |window2| that are to be resized. Determined at the time
-    // the resize starts.
-    std::vector<aura::Window*> other_windows;
-  };
-
-  class ResizeMouseWatcherHost;
-  class ResizeView;
-
-  void CreateMouseWatcher();
-
-  // Returns a ResizeWindows based on the specified arguments. Use is_valid()
-  // to test if the return value is a valid multi window resize location.
-  ResizeWindows DetermineWindows(aura::Window* window,
-                                 int window_component,
-                                 const gfx::Point& point) const;
-
-  // Variant of DetermineWindows() that uses the current location of the mouse
-  // to determine the resize windows.
-  ResizeWindows DetermineWindowsFromScreenPoint(aura::Window* window) const;
-
-  // Finds a window by edge (one of the constants HitTestCompat.
-  aura::Window* FindWindowByEdge(aura::Window* window_to_ignore,
-                                 int edge_want,
-                                 int x_in_parent,
-                                 int y_in_parent) const;
-
-  // Returns the first window touching |window|.
-  aura::Window* FindWindowTouching(aura::Window* window,
-                                   Direction direction) const;
-
-  // Places any windows touching |start| into |others|.
-  void FindWindowsTouching(aura::Window* start,
-                           Direction direction,
-                           std::vector<aura::Window*>* others) const;
-
-  // Shows the resizer if the mouse is still at a valid location. This is called
-  // from the |show_timer_|.
-  void ShowIfValidMouseLocation();
-
-  // Shows the widget immediately.
-  void ShowNow();
-
-  // Returns true if the widget is showing.
-  bool IsShowing() const;
-
-  // Initiates a resize.
-  void StartResize(const gfx::Point& location_in_screen);
-
-  // Resizes to the new location.
-  void Resize(const gfx::Point& location_in_screen, int event_flags);
-
-  // Completes the resize.
-  void CompleteResize();
-
-  // Cancels the resize.
-  void CancelResize();
-
-  // Returns the bounds for the resize widget.
-  gfx::Rect CalculateResizeWidgetBounds(
-      const gfx::Point& location_in_parent) const;
-
-  // Returns true if |location_in_screen| is over the resize widget.
-  bool IsOverResizeWidget(const gfx::Point& location_in_screen) const;
-
-  // Returns true if |location_in_screen| is over the resize windows
-  // (or the resize widget itself).
-  bool IsOverWindows(const gfx::Point& location_in_screen) const;
-
-  // Returns true if |location_in_screen| is over |component| in |window|.
-  bool IsOverComponent(aura::Window* window,
-                       const gfx::Point& location_in_screen,
-                       int component) const;
-
-  // Windows and direction to resize.
-  ResizeWindows windows_;
-
-  // Timer used before showing.
-  base::OneShotTimer show_timer_;
-
-  std::unique_ptr<views::Widget> resize_widget_;
-
-  // If non-null we're in a resize loop.
-  std::unique_ptr<WorkspaceWindowResizer> window_resizer_;
-
-  // Mouse coordinate passed to Show() in container's coodinates.
-  gfx::Point show_location_in_parent_;
-
-  // Bounds the widget was last shown at in screen coordinates.
-  gfx::Rect show_bounds_in_screen_;
-
-  // Used to detect whether the mouse is over the windows. While
-  // |resize_widget_| is non-NULL (ie the widget is showing) we ignore calls
-  // to Show().
-  std::unique_ptr<views::MouseWatcher> mouse_watcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(MultiWindowResizeController);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_WORKSPACE_MULTI_WINDOW_RESIZE_CONTROLLER_H_