wip: Refactoring Ash's AppListController, moving the bulk of the logic to chrome/browser/ui/ash/app…

ui/app_list/shower/app_list_shower_impl.h

Index: ui/app_list/shower/app_list_shower_impl.h
diff --git a/ui/app_list/shower/app_list_shower_impl.h b/ui/app_list/shower/app_list_shower_impl.h
new file mode 100644
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+++ b/ui/app_list/shower/app_list_shower_impl.h
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+// Copyright 2016 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 UI_APP_LIST_SHOWER_APP_LIST_SHOWER_IMPL_H_
+#define UI_APP_LIST_SHOWER_APP_LIST_SHOWER_IMPL_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "ui/app_list/pagination_model_observer.h"
+#include "ui/app_list/shower/app_list_shower.h"
+#include "ui/app_list/shower/app_list_shower_delegate.h"
+#include "ui/aura/client/focus_change_observer.h"
+#include "ui/aura/window_observer.h"
+#include "ui/compositor/layer_animation_observer.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/views/widget/widget_observer.h"
+
+namespace app_list {
+class AppListView;
+class AppListViewDelegate;
+class AppListShowerDelegateFactory;
+
+namespace test {
+class AppListShowerImplTestApi;
+}
+
+class AppListShowerImplTest;
+class AppListViewDelegate;
+
+// Manages app list UI. Creates AppListView and schedules showing/hiding
+// animation. While the UI is visible, it monitors things such as app list
+// activation state to auto dismiss the UI. Delegates the responsibility
+// for laying out the app list UI to ash::AppListLayoutDelegate.
+class APP_LIST_SHOWER_EXPORT AppListShowerImpl
+    : public AppListShower,
+      public aura::client::FocusChangeObserver,
+      public aura::WindowObserver,
+      public ui::ImplicitAnimationObserver,
+      public views::WidgetObserver,
+      public PaginationModelObserver {
+ public:
+  explicit AppListShowerImpl(AppListShowerDelegateFactory* factory);
+  ~AppListShowerImpl() override;
+
+  // Returns app list window or NULL if it is not visible.
+  aura::Window* GetWindow();
+
+  // Returns app list view if one exists, or NULL otherwise.
+  AppListView* GetView() { return view_; }
+
+  // AppListShower:
+  void Show(aura::Window* window) override;
+  void Dismiss() override;
+  bool IsVisible() const override;
+  bool GetTargetVisibility() const override;
+
+ private:
+  friend class test::AppListShowerImplTestApi;
+
+  // Sets the app list view and attempts to show it.
+  void SetView(AppListView* view);
+
+  // Forgets the view.
+  void ResetView();
+
+  // Starts show/hide animation.
+  void ScheduleAnimation();
+
+  // aura::client::FocusChangeObserver overrides:
+  void OnWindowFocused(aura::Window* gained_focus,
+                       aura::Window* lost_focus) override;
+
+  // aura::WindowObserver overrides:
+  void OnWindowBoundsChanged(aura::Window* root,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+
+  // ui::ImplicitAnimationObserver overrides:
+  void OnImplicitAnimationsCompleted() override;
+
+  // views::WidgetObserver overrides:
+  void OnWidgetDestroying(views::Widget* widget) override;
+
+  // PaginationModelObserver overrides:
+  void TotalPagesChanged() override;
+  void SelectedPageChanged(int old_selected, int new_selected) override;
+  void TransitionStarted() override;
+  void TransitionChanged() override;
+
+  // Not owned
+  AppListShowerDelegateFactory* const factory_;
+
+  // Responsible for laying out the app list UI.
+  scoped_ptr<AppListShowerDelegate> shower_delegate_;
+
+  // Whether we should show or hide app list widget.
+  bool is_visible_ = false;
+
+  // The AppListView this class manages, owned by its widget.
+  AppListView* view_ = nullptr;
+
+  // The current page of the AppsGridView of |view_|. This is stored outside of
+  // the view's PaginationModel, so that it persists when the view is destroyed.
+  int current_apps_page_ = -1;
+
+  // Cached bounds of |view_| for snapping back animation after over-scroll.
+  gfx::Rect view_bounds_;
+
+  // Whether should schedule snap back animation.
+  bool should_snap_back_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListShowerImpl);
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_SHOWER_APP_LIST_SHOWER_IMPL_H_