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| 1 // Copyright 2016 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 COMPONENTS_OFFLINE_PAGE_DOWNLOADS_DOWNLOAD_UI_ADAPTER_H_ | |
| 6 #define COMPONENTS_OFFLINE_PAGE_DOWNLOADS_DOWNLOAD_UI_ADAPTER_H_ | |
| 7 | |
| 8 #include <map> | |
| 9 #include <memory> | |
| 10 #include <string> | |
| 11 #include <vector> | |
| 12 | |
| 13 #include "base/observer_list.h" | |
| 14 #include "base/supports_user_data.h" | |
| 15 #include "components/offline_pages/downloads/download_ui_item.h" | |
| 16 #include "components/offline_pages/offline_page_model.h" | |
| 17 #include "components/offline_pages/offline_page_types.h" | |
| 18 #include "url/gurl.h" | |
| 19 | |
| 20 namespace offline_pages { | |
| 21 // C++ side of the UI Adapter. Mimics DownloadManager/Item/History (since we | |
| 22 // share UI with Downloads). | |
| 23 // An instance of this class is owned by OfflinePageModel and is shared between | |
| 24 // UI components if needed. It manages the cache of DownloadUIItems, so after | |
| 25 // initial load the UI components can synchronously pull the whoel list or any | |
| 26 // item by its guid. | |
| 27 class DownloadUIAdapter : public OfflinePageModel::Observer, | |
| 28 public base::SupportsUserData::Data { | |
| 29 public: | |
| 30 // Observer, normally implemented by UI or a Bridge. | |
| 31 class Observer { | |
| 32 public: | |
| 33 // Invoked when UI items are loaded. GetAllItems/GetItem can now be used. | |
| 34 // Must be listened for in order to start getting the items. | |
| 35 // If the items are already loaded by the time observer is added, this | |
| 36 // callback will be posted right away. | |
| 37 virtual void ItemsLoaded() = 0; | |
| 38 | |
| 39 // Invoked when the UI Item was added, usually as a request to download. | |
| 40 virtual void ItemAdded(const DownloadUIItem& item) = 0; | |
| 41 | |
| 42 // Invoked when the UI Item was updated. Only guid of the item is guaranteed | |
| 43 // to survive the update, all other fields can change. | |
| 44 virtual void ItemUpdated(const DownloadUIItem& item) = 0; | |
| 45 | |
| 46 // Invoked when the UI Item was deleted. At this point, only guid remains. | |
| 47 virtual void ItemDeleted(const std::string& guid) = 0; | |
| 48 | |
| 49 protected: | |
| 50 virtual ~Observer() = default; | |
| 51 }; | |
| 52 | |
| 53 explicit DownloadUIAdapter(OfflinePageModel* model); | |
| 54 ~DownloadUIAdapter() override; | |
| 55 | |
| 56 static DownloadUIAdapter* FromOfflinePageModel( | |
| 57 OfflinePageModel* offline_page_model); | |
| 58 | |
| 59 // Checks a client ID for proper namespace and ID format to be shown in the | |
| 60 // Downloads Home UI. | |
| 61 bool IsVisibleInUI(const ClientId& page); | |
| 62 | |
| 63 // This adapter is potentially shared by UI elements, each of which adds | |
| 64 // itself as an observer. | |
| 65 // When the last observer si removed, cached list of items is destroyed and | |
| 66 // next time the initial loading will take longer. | |
| 67 void AddObserver(Observer* observer); | |
| 68 void RemoveObserver(Observer* observer); | |
| 69 | |
| 70 // Returns all UI items. The list contains references to items in the cache | |
| 71 // and has to be used synchronously. | |
| 72 std::vector<const DownloadUIItem*> GetAllItems() const; | |
| 73 // May return nullptr if item with specified guid does not exist. | |
| 74 const DownloadUIItem* GetItem(const std::string& guid) const; | |
| 75 | |
| 76 // Commands from UI. Start async operations, result is observable | |
| 77 // via Observer or directly by the user (as in 'open'). | |
| 78 void DeleteItem(const std::string& guid); | |
| 79 int64_t GetOfflineIdByGuid(const std::string& guid) const; | |
| 80 | |
| 81 // OfflinePageModel::Observer | |
| 82 void OfflinePageModelLoaded(OfflinePageModel* model) override; | |
| 83 void OfflinePageModelChanged(OfflinePageModel* model) override; | |
| 84 void OfflinePageDeleted(int64_t offline_id, | |
| 85 const ClientId& client_id) override; | |
| 86 | |
| 87 private: | |
| 88 enum class State { | |
| 89 NOT_LOADED, | |
| 90 LOADING, | |
| 91 LOADED | |
| 92 }; | |
| 93 | |
| 94 struct ItemInfo { | |
| 95 explicit ItemInfo(const OfflinePageItem& page); | |
| 96 ~ItemInfo(); | |
| 97 | |
| 98 std::unique_ptr<DownloadUIItem> ui_item; | |
| 99 // Additional cached data, not exposed to UI through DownloadUIItem. | |
| 100 int64_t offline_id; | |
| 101 | |
| 102 private: | |
| 103 DISALLOW_COPY_AND_ASSIGN(ItemInfo); | |
| 104 }; | |
| 105 | |
| 106 typedef std::map<std::string, std::unique_ptr<ItemInfo>> DownloadUIItems; | |
| 107 | |
| 108 void LoadCache(); | |
| 109 void ClearCache(); | |
| 110 | |
| 111 // Task callbacks. | |
| 112 void OnOfflinePagesLoaded(const MultipleOfflinePageItemResult& pages); | |
| 113 void NotifyItemsLoaded(Observer* observer); | |
| 114 void OnOfflinePagesChanged(const MultipleOfflinePageItemResult& pages); | |
| 115 void OnDeletePagesDone(DeletePageResult result); | |
| 116 | |
| 117 // Always valid, this class is a member of the model. | |
| 118 OfflinePageModel* model_; | |
| 119 | |
| 120 State state_; | |
| 121 | |
| 122 // The cache of UI items. The key is DownloadUIItem.guid. | |
| 123 DownloadUIItems items_; | |
| 124 | |
| 125 // The observers. | |
| 126 base::ObserverList<Observer> observers_; | |
| 127 int observers_count_; | |
| 128 | |
| 129 base::WeakPtrFactory<DownloadUIAdapter> weak_ptr_factory_; | |
| 130 | |
| 131 DISALLOW_COPY_AND_ASSIGN(DownloadUIAdapter); | |
| 132 }; | |
| 133 | |
| 134 } // namespace offline_pages | |
| 135 | |
| 136 #endif // COMPONENTS_OFFLINE_PAGE_DOWNLOADS_DOWNLOAD_UI_ADAPTER_H_ | |
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Chromium Code Reviews
Issue 2489443002:
Move all components/offline_pages/ files into component/offline_pages/core (Closed)
