Print Preview: Store preview data in the print preview handler....

chrome/browser/printing/print_preview_message_handler.h

+// Copyright (c) 2011 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_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
+#define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_
+#pragma once
+
+#include "chrome/browser/tab_contents/tab_contents_observer.h"
+
+struct ViewHostMsg_DidPreviewDocument_Params;
+
+namespace printing {
+
+// TabContents offloads print preview message handling to
+// PrintPreviewMessageHandler. This object has the same life time as the
+// TabContents that owns it.
+class PrintPreviewMessageHandler : public TabContentsObserver {
+ public:
+  explicit PrintPreviewMessageHandler(TabContents* owner);
+  virtual ~PrintPreviewMessageHandler();
+
+  void OnPagesReadyForPreview(
+      const ViewHostMsg_DidPreviewDocument_Params& params);
+
+  // TabContentsObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message);
+
+ private:
+  // Get the print preview tab associated with |owner_| or create a new print
+  // preview tab if necessary.
+  TabContents* GetOrCreatePrintPreviewTab();
+
+  // The TabContents that owns this PrintPreviewMessageHandler.
+  TabContents* owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewMessageHandler);
+};
+
+}  // namespace printing
+
+#endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_MESSAGE_HANDLER_H_