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/previews/previews_infobar_delegate.h"
+#include "chrome/common/features.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.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"
 
+#if BUILDFLAG(ANDROID_JAVA_UI)
+#include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
+#endif  // BUILDFLAG(ANDROID_JAVA_UI)
+
 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())
+  // Only show the infobar if this is a full main frame navigation.
+  if (!navigation_handle->IsInMainFrame() ||
+      !navigation_handle->HasCommitted() || navigation_handle->IsSamePage())
     return;
+  is_showing_offline_preview_ = false;
+  displayed_preview_infobar_ = false;
+
+#if BUILDFLAG(ANDROID_JAVA_UI)
+  offline_pages::OfflinePageTabHelper* tab_helper =
+      offline_pages::OfflinePageTabHelper::FromWebContents(web_contents());
+
+  if (tab_helper && tab_helper->IsShowingOfflinePreview()) {
+    if (navigation_handle->IsErrorPage()) {
+      // TODO(ryansturm): Add UMA for errors.
+      return;
+    }
+    is_showing_offline_preview_ = true;
+    PreviewsInfoBarDelegate::Create(web_contents(),
+                                    PreviewsInfoBarDelegate::OFFLINE);
+    // Don't try to show other infobars if this is an offline preview.
+    return;
+  }
+#endif  // BUILDFLAG(ANDROID_JAVA_UI)
+
   const net::HttpResponseHeaders* headers =
       navigation_handle->GetResponseHeaders();
-  if (headers &&
-      data_reduction_proxy::IsLitePagePreview(*headers)) {
-    PreviewsInfoBarDelegate::Create(navigation_handle->GetWebContents(),
+  if (headers && data_reduction_proxy::IsLitePagePreview(*headers)) {
+    PreviewsInfoBarDelegate::Create(web_contents(),
                                     PreviewsInfoBarDelegate::LITE_PAGE);
   }
 }