Showing previews UI for Offline Previews

chrome/browser/previews/previews_infobar_tab_helper.cc

 // 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.
 
 #include "chrome/browser/previews/previews_infobar_tab_helper.h"
 
+#include "chrome/browser/loader/chrome_navigation_data.h"
 #include "chrome/browser/previews/previews_infobar_delegate.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h"
+#include "components/offline_pages/loaded_offline_page_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "net/http/http_response_headers.h"
 #include "url/gurl.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(PreviewsInfoBarTabHelper);
 
 PreviewsInfoBarTabHelper::~PreviewsInfoBarTabHelper() {}
 
 PreviewsInfoBarTabHelper::PreviewsInfoBarTabHelper(
     content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
-      displayed_preview_infobar_(false) {
+      displayed_preview_infobar_(false),
+      is_showing_offline_preview_(false) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 }
 
-void PreviewsInfoBarTabHelper::DidStartProvisionalLoadForFrame(
-    content::RenderFrameHost* render_frame_host,
-    const GURL& validated_url,
-    bool is_error_page,
-    bool is_iframe_srcdoc) {
-  if (!render_frame_host->GetParent())
-    set_displayed_preview_infobar(false);
-}
-
 void PreviewsInfoBarTabHelper::DidFinishNavigation(
     content::NavigationHandle* navigation_handle) {
-  if (!navigation_handle->IsInMainFrame() || !navigation_handle->HasCommitted())
+  // Do nothing if this is not a full main frame navigation.

[megjablon, 2016/10/07 22:48:33]

Suggestion: Rather than the double negative
// Only show the infobar if this is a full main frame navigation

[RyanSturm, 2016/10/07 23:05:48]

Done.

+  if (!navigation_handle->IsInMainFrame() ||
+      !navigation_handle->HasCommitted() || navigation_handle->IsSamePage())

[megjablon, 2016/10/07 22:48:33]

Does a refresh count as same page? 

[RyanSturm, 2016/10/07 23:05:48]

This checks for fragment navigations (i.e. links that scroll the page to a
specific location), not reloads.

[megjablon, 2016/10/10 22:25:13]

Ok cool. 

     return;
+  is_showing_offline_preview_ = false;
+  displayed_preview_infobar_ = false;
+
+  ChromeNavigationData* chrome_navigation_data =
+      ChromeNavigationData::GetForNavigationHandle(navigation_handle);
+  if (chrome_navigation_data) {
+    offline_pages::LoadedOfflinePageInfo* info =
+        chrome_navigation_data->GetLoadedOfflinePageInfo();
+    if (info && info->is_offline_preview()) {
+      if (navigation_handle->IsErrorPage()) {
+        // TODO(ryansturm): Add UMA for errors.
+        return;
+      }
+      is_showing_offline_preview_ = true;
+      PreviewsInfoBarDelegate::Create(navigation_handle->GetWebContents(),
+                                      PreviewsInfoBarDelegate::OFFLINE);
+      // Don't try to show other infobars if this is an offline preview.
+      return;
+    }
+  }
+
   const net::HttpResponseHeaders* headers =
       navigation_handle->GetResponseHeaders();
   if (headers &&
       headers->HasHeaderValue(
           data_reduction_proxy::chrome_proxy_header(),
           data_reduction_proxy::chrome_proxy_lo_fi_preview_directive())) {
     PreviewsInfoBarDelegate::Create(navigation_handle->GetWebContents(),
                                     PreviewsInfoBarDelegate::LITE_PAGE);
   }
 }