Showing previews UI for Offline Previews

chrome/browser/android/offline_pages/offline_page_tab_helper.h

 // 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 CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_TAB_HELPER_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_TAB_HELPER_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
+#include "components/offline_pages/loaded_offline_page_info.h"
 #include "components/offline_pages/request_header/offline_page_header.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "url/gurl.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace offline_pages {
-
 struct OfflinePageItem;
 
 // Per-tab class that monitors the navigations and stores the necessary info
 // to facilitate the synchronous access to offline information.
 class OfflinePageTabHelper :
     public content::WebContentsObserver,
     public content::WebContentsUserData<OfflinePageTabHelper> {
  public:
   ~OfflinePageTabHelper() override;
 
-  void SetOfflinePage(const OfflinePageItem& offline_page,
-                      const OfflinePageHeader& offline_header,
-                      bool is_offline_preview);
-
-  const OfflinePageItem* offline_page() {
-    return offline_info_.offline_page.get();
+  const OfflinePageItem* offline_page() const {
+    if (!offline_info_ || !offline_info_->offline_page())
+      return nullptr;
+    return offline_info_->offline_page();
   }
 
-  const OfflinePageHeader& offline_header() const {
-    return offline_info_.offline_header;
+  const OfflinePageHeader* offline_header() const {
+    if (!offline_info_ || !offline_info_->offline_header()) {
+      return nullptr;
+    }
+    return offline_info_->offline_header();
   }
 
-  // Whether the page is an offline preview.
-  bool is_offline_preview() const { return offline_info_.is_offline_preview; }
-
-  // Returns provisional offline page since actual navigation does not happen
-  // during unit tests.
-  const OfflinePageItem* GetOfflinePageForTest() const;
-
  private:
   friend class content::WebContentsUserData<OfflinePageTabHelper>;
 
-  // Contains the info about the offline page being loaded.
-  struct LoadedOfflinePageInfo {
-    LoadedOfflinePageInfo();
-    ~LoadedOfflinePageInfo();
-
-    // The cached copy of OfflinePageItem.
-    std::unique_ptr<OfflinePageItem> offline_page;
-
-    // The offline header that is provided when offline page is loaded.
-    OfflinePageHeader offline_header;
-
-    // Whether the page is an offline preview. Offline page previews are shown
-    // when a user's effective connection type is prohibitively slow.
-    bool is_offline_preview;
-
-    void Clear();
-  };
-
   explicit OfflinePageTabHelper(content::WebContents* web_contents);
 
   // Overridden from content::WebContentsObserver:
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
 
   void SelectPageForOnlineURLDone(const OfflinePageItem* offline_page);
 
-  // The provisional info about the offline page being loaded. This is set when
-  // the offline interceptor decides to serve the offline page and it will be
-  // moved to |offline_info_| once the navigation is committed without error.
-  LoadedOfflinePageInfo provisional_offline_info_;
-
-  // The info about offline page being loaded. This is set from
-  // |provisional_offline_info_| when the navigation is committed without error.
-  // This can be used to by the Tab to synchronously ask about the offline
-  // info.
-  LoadedOfflinePageInfo offline_info_;
+  // The info about offline page being loaded. This is set when the navigation
+  // is committed without error. This can be used to by the Tab to synchronously
+  // ask about the offline info.
+  std::unique_ptr<LoadedOfflinePageInfo> offline_info_;
 
   bool reloading_url_on_net_error_ = false;
 
   base::WeakPtrFactory<OfflinePageTabHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageTabHelper);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_TAB_HELPER_H_