Changes HomeCard to fullscreen from bottom when typing a query.

athena/home/athena_start_page_view.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_HOME_ATHENA_START_PAGE_VIEW_H_
 #define ATHENA_HOME_ATHENA_START_PAGE_VIEW_H_
 
 #include "athena/athena_export.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "ui/app_list/views/search_box_view_delegate.h"
 #include "ui/gfx/animation/tween.h"
 #include "ui/views/view.h"
 
 namespace app_list {
 class AppListViewDelegate;
 class SearchBoxView;
 class SearchResultListView;
 }
 
 namespace athena {
 
 class ATHENA_EXPORT AthenaStartPageView
     : public views::View,
       public app_list::SearchBoxViewDelegate {
  public:
+  class Observer {
+   public:
+    virtual void OnLayoutStateChanged(float new_state) = 0;
+  };
+
   explicit AthenaStartPageView(app_list::AppListViewDelegate* delegate);
   virtual ~AthenaStartPageView();
 
   // Requests the focus on the search box in the start page view.
   void RequestFocusOnSearchBox();
 
   // Updates the layout state. See the comment of |layout_state_| field.
   void SetLayoutState(float layout_state);
 
   // Updates the layout state and move the subviews to the target location with
   // animation.
   void SetLayoutStateWithAnimation(float layout_state,
                                    gfx::Tween::Type tween_type);
 
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
  private:
   friend class AthenaStartPageViewTest;
 
   static const char kViewClassName[];
 
   // A struct which bundles the layout data of subviews.
   struct LayoutData {
     gfx::Rect search_box;
     gfx::Rect icons;
     gfx::Rect controls;
@@ skipping 41 matching lines @@
   // background opacity update and animation.
   views::View* background_;
 
   // The expected height of |search_results_view_|
   int search_results_height_;
 
   // The state to specify how each of the subviews should be laid out, in the
   // range of [0, 1]. 0 means fully BOTTOM state, and 1 is fully CENTERED state.
   float layout_state_;
 
+  ObserverList<Observer> observers_;
+
   base::WeakPtrFactory<AthenaStartPageView> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AthenaStartPageView);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_HOME_ATHENA_START_PAGE_VIEW_H_