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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
      6 #define UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/weak_ptr.h"
     10 #include "ui/app_list/app_list_export.h"
     11 #include "ui/app_list/app_list_model.h"
     12 #include "ui/app_list/app_list_view_delegate_observer.h"
     13 #include "ui/app_list/views/search_box_view_delegate.h"
     14 #include "ui/base/models/list_model_observer.h"
     15 #include "ui/views/view.h"
     16 
     17 namespace app_list {
     18 
     19 class AppListMainView;
     20 class AppListViewDelegate;
     21 class SearchResultListView;
     22 class TileItemView;
     23 
     24 // The start page for the experimental app list.
     25 class APP_LIST_EXPORT StartPageView : public views::View,
     26                                       public ui::ListModelObserver,
     27                                       public SearchBoxViewDelegate {
     28  public:
     29   StartPageView(AppListMainView* app_list_main_view,
     30                 AppListViewDelegate* view_delegate);
     31   virtual ~StartPageView();
     32 
     33   void Reset();
     34   void ShowSearchResults();
     35 
     36   bool IsShowingSearchResults() const;
     37 
     38   void UpdateForTesting();
     39 
     40   const std::vector<TileItemView*>& tile_views() const { return tile_views_; }
     41   SearchBoxView* dummy_search_box_view() { return search_box_view_; }
     42 
     43   // Overridden from views::View:
     44   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
     45   virtual void Layout() OVERRIDE;
     46 
     47  private:
     48   enum ShowState {
     49     SHOW_START_PAGE,
     50     SHOW_SEARCH_RESULTS,
     51   };
     52 
     53   void InitInstantContainer();
     54   void InitTilesContainer();
     55 
     56   void SetShowState(ShowState show_state);
     57   void SetModel(AppListModel* model);
     58 
     59   // Updates UI with model.
     60   void Update();
     61 
     62   // Schedules an Update() call using |update_factory_|. Does nothing if there
     63   // is a pending call.
     64   void ScheduleUpdate();
     65 
     66   // Overridden from SearchBoxViewDelegate:
     67   virtual void QueryChanged(SearchBoxView* sender) OVERRIDE;
     68 
     69   // Overridden from ui::ListModelObserver:
     70   virtual void ListItemsAdded(size_t start, size_t count) OVERRIDE;
     71   virtual void ListItemsRemoved(size_t start, size_t count) OVERRIDE;
     72   virtual void ListItemMoved(size_t index, size_t target_index) OVERRIDE;
     73   virtual void ListItemsChanged(size_t start, size_t count) OVERRIDE;
     74 
     75   // The parent view of ContentsView which is the parent of this view.
     76   AppListMainView* app_list_main_view_;
     77 
     78   AppListModel::SearchResults*
     79       search_results_model_;  // Owned by AppListSyncableService.
     80 
     81   AppListViewDelegate* view_delegate_;  // Owned by AppListView.
     82 
     83   SearchBoxView* search_box_view_;      // Owned by views hierarchy.
     84   SearchResultListView* results_view_;  // Owned by views hierarchy.
     85   views::View* instant_container_;  // Owned by views hierarchy.
     86   views::View* tiles_container_;    // Owned by views hierarchy.
     87 
     88   std::vector<TileItemView*> tile_views_;
     89 
     90   ShowState show_state_;
     91 
     92   // ScheduleUpdate() generates a single weak pointer; if one exists then an
     93   // update is pending. Further calls to ScheduleUpdate() will have no effect.
     94   // Once the Update() completes, the weak pointer is invalidated.
     95   base::WeakPtrFactory<StartPageView> update_factory_;
     96 
     97   DISALLOW_COPY_AND_ASSIGN(StartPageView);
     98 };
     99 
    100 }  // namespace app_list
    101 
    102 #endif  // UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
    103