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

chrome/browser/dom_ui/print_preview_ui_html_source.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_DOM_UI_PRINT_PREVIEW_UI_HTML_SOURCE_H_
+#define CHROME_BROWSER_DOM_UI_PRINT_PREVIEW_UI_HTML_SOURCE_H_
+#pragma once
+
+#include <string>
+#include <utility>
+
+#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
+
+namespace base {
+class SharedMemory;
+}
+
+class PrintPreviewUIHTMLSource : public ChromeURLDataManager::DataSource {
+ public:
+  // A SharedMemory that contains the data for print preview,
+  // and the size of the print preview data in bytes.
+  typedef std::pair<base::SharedMemory*, uint32> PrintPreviewData;
+
+  PrintPreviewUIHTMLSource();
+  virtual ~PrintPreviewUIHTMLSource();
+
+  // Gets the print preview |data|. The data is valid as long as the
+  // PrintPreviewHandler is valid and SetPrintPreviewData() does not get called.
+  void GetPrintPreviewData(PrintPreviewData* data);
+
+  // Sets the print preview |data|. PrintPreviewHandler owns the data and is
+  // responsible for freeing it when either:
+  // a) there is new data.
+  // b) when PrintPreviewHandler is destroyed.
+  void SetPrintPreviewData(const PrintPreviewData& data);
+
+  // ChromeURLDataManager::DataSource implementation.
+  virtual void StartDataRequest(const std::string& path,
+                                bool is_off_the_record,
+                                int request_id);
+  virtual std::string GetMimeType(const std::string&) const;
+
+ private:
+  // Current print preview data, the contents of which are owned by
+  // PrintPreviewHandler.
+  PrintPreviewData data_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewUIHTMLSource);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_PRINT_PREVIEW_UI_HTML_SOURCE_H_