Delete athena/

athena/wm/split_view_controller.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 ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
-#define ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
-
-#include "athena/athena_export.h"
-#include "athena/util/drag_handle.h"
-#include "athena/wm/public/window_list_provider_observer.h"
-#include "athena/wm/public/window_manager_observer.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-
-namespace gfx {
-class Rect;
-class Transform;
-}
-
-namespace aura {
-class ScopedWindowTargeter;
-class Window;
-class WindowTargeter;
-}
-
-namespace views {
-class ViewTargeterDelegate;
-class Widget;
-}
-
-namespace athena {
-class SplitViewControllerTest;
-class WindowListProviderImpl;
-
-// Responsible for entering split view mode, exiting from split view mode, and
-// laying out the windows in split view mode.
-class ATHENA_EXPORT SplitViewController
-    : public DragHandleScrollDelegate,
-      public WindowManagerObserver,
-      public WindowListProviderObserver {
- public:
-  SplitViewController(aura::Window* container,
-                      WindowListProviderImpl* window_list_provider);
-
-  ~SplitViewController() override;
-
-  bool CanActivateSplitViewMode() const;
-  bool IsSplitViewModeActive() const;
-
-  // Activates split-view mode with |left| and |right| windows. If |left| and/or
-  // |right| is nullptr, then the first window in the window-list (which is
-  // neither
-  // |left| nor |right|) is selected instead. |to_activate| indicates which of
-  // |left| or |right| should be activated. If |to_activate| is nullptr, the
-  // currently active window is kept active if it is one of the split-view
-  // windows.
-  void ActivateSplitMode(aura::Window* left,
-                         aura::Window* right,
-                         aura::Window* to_activate);
-
-  // Resets the internal state to an inactive state.
-  void DeactivateSplitMode();
-
-  // Replaces |window| in split-view mode with |replace_with|. Adjusts
-  // |replace_with|'s visibility, transform and bounds. Resets |window|'s
-  // visibility and transform but does not change its bounds.
-  void ReplaceWindow(aura::Window* window,
-                     aura::Window* replace_with);
-
-  // Returns the bounds of the left and right parts of the |container_| based
-  // on the current value of |divider_position_|.
-  gfx::Rect GetLeftAreaBounds();
-  gfx::Rect GetRightAreaBounds();
-
-  aura::Window* left_window() { return left_window_; }
-  aura::Window* right_window() { return right_window_; }
-
- private:
-  friend class SplitViewControllerTest;
-
-  enum State {
-    // Split View mode is not active. |left_window_| and |right_window| are
-    // nullptr.
-    INACTIVE,
-    // Two windows |left_window_| and |right_window| are shown side by side and
-    // there is a horizontal scroll in progress which is dragging the divider
-    // between the two windows.
-    SCROLLING,
-    // Split View mode is active with |left_window_| and |right_window| showing
-    // side by side each occupying half the screen. No scroll in progress.
-    ACTIVE
-  };
-
-  void SetState(State state);
-
-  void InitializeDivider();
-  void HideDivider();
-  void ShowDivider();
-
-  void UpdateLayout(bool animate);
-
-  void SetWindowTransforms(const gfx::Transform& left_transform,
-                           const gfx::Transform& right_transform,
-                           const gfx::Transform& divider_transform,
-                           bool animate);
-
-  // Called when the animation initiated by SetWindowTransforms() completes.
-  void OnAnimationCompleted();
-
-  // Returns the default divider position for when the split view mode is
-  // active and the divider is not being dragged.
-  int GetDefaultDividerPosition();
-
-  // Access to constants in anonymous namespace for testing purposes.
-  float GetMaxDistanceFromMiddleForTest() const;
-  float GetMinFlingVelocityForTest() const;
-
-  // DragHandleScrollDelegate:
-  void HandleScrollBegin(float delta) override;
-  void HandleScrollEnd(float velocity) override;
-  void HandleScrollUpdate(float delta) override;
-
-  // WindowManagerObserver:
-  void OnOverviewModeEnter() override;
-  void OnOverviewModeExit() override;
-  void OnSplitViewModeEnter() override;
-  void OnSplitViewModeExit() override;
-
-  // WindowListProviderObserver:
-  void OnWindowStackingChangedInList() override {}
-  void OnWindowAddedToList(aura::Window* added_window) override;
-  void OnWindowRemovedFromList(aura::Window* removed_window,
-                               int index) override;
-
-  State state_;
-
-  aura::Window* container_;
-
-  // Provider of the list of windows to cycle through. Not owned.
-  WindowListProviderImpl* window_list_provider_;
-
-  // Windows for the left and right activities shown in SCROLLING and ACTIVE
-  // states. In INACTIVE state these are nullptr.
-  aura::Window* left_window_;
-  aura::Window* right_window_;
-
-  // X-Coordinate of the (center of the) divider between left_window_ and
-  // right_window_ in |container_| coordinates.
-  int divider_position_;
-
-  // Meaningful only when state_ is SCROLLING.
-  // X-Coordinate of the divider when the scroll started.
-  int divider_scroll_start_position_;
-
-  // Visually separates the windows and contains the drag handle.
-  views::Widget* divider_widget_;
-
-  // The drag handle which can be used when split view is active to exit the
-  // split view mode.
-  views::View* drag_handle_;
-
-  scoped_ptr<aura::ScopedWindowTargeter> window_targeter_;
-  scoped_ptr<views::ViewTargeterDelegate> view_targeter_delegate_;
-
-  // Windows which should be hidden when the animation initiated by
-  // UpdateLayout() completes.
-  std::vector<aura::Window*> to_hide_;
-
-  base::WeakPtrFactory<SplitViewController> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(SplitViewController);
-};
-
-}  // namespace athena
-
-#endif  // ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_