New AppListView Scroll Behavior.

ui/app_list/views/app_list_view.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 UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 116 matching lines @@
   bool is_fullscreen() const {
     return app_list_state_ == FULLSCREEN_ALL_APPS ||
            app_list_state_ == FULLSCREEN_SEARCH;
   }
 
   AppListState app_list_state() const { return app_list_state_; }
 
   // Called when maximize mode starts and ends.
   void OnMaximizeModeChanged(bool started);
 
+  // Changes |app_list_state_| from |PEEKING| to |FULLSCREEN_ALL_APPS|.
+  bool HandleScroll(const ui::Event* event);
+
  private:
   friend class test::AppListViewTestApi;
 
   void InitContents(gfx::NativeView parent, int initial_apps_page);
 
   void InitChildWidgets();
 
   // Initializes the widget for fullscreen mode.
   void InitializeFullscreen(gfx::NativeView parent, int initial_apps_page);
 
@@ skipping 15 matching lines @@
   void OnBeforeBubbleWidgetInit(views::Widget::InitParams* params,
                                 views::Widget* widget) const override;
   int GetDialogButtons() const override;
 
   // Overridden from views::WidgetDelegateView:
   views::View* GetInitiallyFocusedView() override;
   bool WidgetHasHitTestMask() const override;
   void GetWidgetHitTestMask(gfx::Path* mask) const override;
 
   // Overridden from ui::EventHandler:
+  void OnScrollEvent(ui::ScrollEvent* event) override;
   void OnMouseEvent(ui::MouseEvent* event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Overridden from views::WidgetObserver:
   void OnWidgetDestroying(views::Widget* widget) override;
   void OnWidgetVisibilityChanged(views::Widget* widget, bool visible) override;
 
   // Overridden from SpeechUIModelObserver:
   void OnSpeechRecognitionStateChanged(
       SpeechRecognitionState new_state) override;
@@ skipping 39 matching lines @@
 
   // For UMA and testing. If non-null, triggered when the app list is painted.
   base::Closure next_paint_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_