Show offline interstitial page when offline and reload when reconnected to network.

chrome/browser/chromeos/offline/offline_load_page.cc

+// Copyright (c) 2010 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/chromeos/offline/offline_load_page.h"
+
+#include "app/l10n_util.h"
+#include "app/resource_bundle.h"
+#include "base/histogram.h"
+#include "base/i18n/rtl.h"
+#include "base/string_piece.h"
+#include "base/values.h"
+#include "chrome/browser/browser.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/tab_contents/navigation_controller.h"
+#include "chrome/browser/tab_contents/navigation_entry.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/tab_contents/tab_util.h"
+#include "chrome/common/jstemplate_builder.h"
+#include "chrome/common/notification_type.h"
+#include "grit/browser_resources.h"
+#include "grit/generated_resources.h"
+
+namespace {
+
+// Maximum time to show a blank page.
+const int kMaxBlankPeriod = 3000;
+
+// A utility function to set the dictionary's value given by |resource_id|.
+void SetString(DictionaryValue* strings, const wchar_t* name, int resource_id) {
+  strings->SetString(name, l10n_util::GetString(resource_id));
+}
+
+}  // namespace
+
+namespace chromeos {
+
+// static
+void OfflineLoadPage::Show(int process_host_id, int render_view_id,
+                           const GURL& url, Delegate* delegate) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  if (NetworkStateNotifier::is_connected()) {
+    // Check again in UI thread and proceed if it's connected.
+    delegate->OnBlockingPageComplete(true);
+  } else {
+    TabContents* tab_contents =
+        tab_util::GetTabContentsByID(process_host_id, render_view_id);
+    DCHECK(tab_contents);
+    (new OfflineLoadPage(tab_contents, url, delegate))->Show();
+  }
+}
+
+OfflineLoadPage::OfflineLoadPage(TabContents* tab_contents,
+                                 const GURL& url,
+                                 Delegate* delegate)
+    : InterstitialPage(tab_contents, true, url),
+      delegate_(delegate) {
+  registrar_.Add(this, NotificationType::NETWORK_STATE_CHANGED,
+                 NotificationService::AllSources());
+}
+
+std::string OfflineLoadPage::GetHTMLContents() {
+  DictionaryValue strings;
+  SetString(&strings, L"headLine", IDS_OFFLINE_LOAD_HEADLINE);
+  SetString(&strings, L"description", IDS_OFFLINE_LOAD_DESCRIPTION);
+  SetString(&strings, L"load_button", IDS_OFFLINE_LOAD_BUTTON);
+  SetString(&strings, L"back_button", IDS_OFFLINE_BACK_BUTTON);
+
+  // TODO(oshima): tab()->GetTitle() always return url. This has to be
+  // a cached title.
+  strings.SetString(L"title", UTF16ToWide(tab()->GetTitle()));
+  strings.SetString(L"textdirection", base::i18n::IsRTL() ? L"rtl" : L"ltr");
+  strings.SetString(L"display_go_back",
+                    tab()->controller().CanGoBack() ? L"inline" : L"none");
+  int64 time_to_wait = std::max(
+      static_cast<int64>(0),
+      kMaxBlankPeriod -
+          NetworkStateNotifier::GetOfflineDuration().InMilliseconds());
+  strings.SetString(L"on_load",
+                    StringPrintf(L"startTimer(%ld)", time_to_wait));
+
+  // TODO(oshima): thumbnail is not working yet. fix this.
+  const std::string url = "chrome://thumb/" + GetURL().spec();
+  strings.SetString(L"thumbnailUrl", "url(" + url + ")");
+
+  base::StringPiece html(
+      ResourceBundle::GetSharedInstance().GetRawDataResource(
+          IDR_OFFLINE_LOAD_HTML));
+  return jstemplate_builder::GetI18nTemplateHtml(html, &strings);
+}
+
+void OfflineLoadPage::CommandReceived(const std::string& cmd) {
+  std::string command(cmd);
+  // The Jasonified response has quotes, remove them.
+  if (command.length() > 1 && command[0] == '"') {
+    command = command.substr(1, command.length() - 2);
+  }
+  // TODO(oshima): record action for metrics.
+  if (command == "proceed") {
+    Proceed();
+  } else if (command == "dontproceed") {
+    DontProceed();
+  } else {
+    LOG(WARNING) << "Unknown command:" << cmd;
+  }
+}
+
+void OfflineLoadPage::Proceed() {
+  delegate_->OnBlockingPageComplete(true);
+  InterstitialPage::Proceed();
+}
+
+void OfflineLoadPage::DontProceed() {
+  delegate_->OnBlockingPageComplete(false);
+  InterstitialPage::DontProceed();
+}
+
+void OfflineLoadPage::Observe(NotificationType type,
+                              const NotificationSource& source,
+                              const NotificationDetails& details) {
+  if (type.value == NotificationType::NETWORK_STATE_CHANGED) {
+    chromeos::NetworkStateDetails* state_details =
+        Details<chromeos::NetworkStateDetails>(details).ptr();
+    DLOG(INFO) << "NetworkStateChanaged notification received: state="
+               << state_details->state();
+    if (state_details->state() ==
+        chromeos::NetworkStateDetails::CONNECTED) {
+      registrar_.Remove(this, NotificationType::NETWORK_STATE_CHANGED,
+                        NotificationService::AllSources());
+      Proceed();
+    }
+  } else {
+    InterstitialPage::Observe(type, source, details);
+  }
+}
+
+}  // namespace chromeos