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

chrome/browser/chromeos/offline/offline_load_page.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_OFFLINE_OFFLINE_LOAD_PAGE_H_
+#define CHROME_BROWSER_CHROMEOS_OFFLINE_OFFLINE_LOAD_PAGE_H_
+
+#include <string>
+
+#include "chrome/browser/chromeos/network_state_notifier.h"
+#include "chrome/browser/tab_contents/interstitial_page.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_service.h"
+
+class TabContents;
+
+namespace chromeos {
+
+// OfflineLoadPage class shows the interstitial page that is shown
+// when no network is available and hides when some network (either
+// one of wifi, 3g or ethernet) becomes available.
+// It deletes itself when the interstitial page is closed.
+class OfflineLoadPage : public InterstitialPage {
+ public:
+  // A delegate class that is called when the interstitinal page
+  // is closed.
+  class Delegate {
+   public:
+    Delegate() {}
+    virtual ~Delegate() {}
+    // Called when a user selected to proceed or not to proceed
+    // with loading.
+    virtual void OnBlockingPageComplete(bool proceed) = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+  static void Show(int process_host_id, int render_view_id,
+                   const GURL& url, Delegate* delegate);
+  // Import show here so that overloading works.
+  using InterstitialPage::Show;
+
+ protected:
+  // Create a offline load page for the |tab_contents|.
+  OfflineLoadPage(TabContents* tab_contents, const GURL& url,
+                  Delegate* delegate);
+  virtual ~OfflineLoadPage() {}
+
+ private:
+  // InterstitialPage implementation.
+  virtual std::string GetHTMLContents();
+  virtual void CommandReceived(const std::string& command);
+  virtual void Proceed();
+  virtual void DontProceed();
+
+  // Overrides InterstitialPage's Observe.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  Delegate* delegate_;
+  NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(OfflineLoadPage);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_OFFLINE_OFFLINE_LOAD_PAGE_H_