PrintPreview: Print Preview is not staying associated with initiator renderer.

chrome/browser/ui/webui/print_preview_data_manager.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_UI_WEBUI_PRINT_PREVIEW_DATA_MANAGER_H_
+#define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_DATA_MANAGER_H_
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+
+class PrintPreviewUI;
+
+namespace base {
+class SharedMemory;
+}
+
+// PrintPreviewDataManager manages data for chrome://print requests.
+//
+// PrintPreviewDataManager owns the data and is responsible for freeing it when
+// either:
+//    a) there is a new data.
+//    b) When PrintPreviewDataManager is destroyed.
+//
+
+class PrintPreviewDataManager
+    : public base::RefCounted<PrintPreviewDataManager> {

[sky, 2011/05/26 17:40:41]

Does this class really need to be refcounted?

[kmadhusu, 2011/05/27 16:49:22]

No. Fixed the code.

+ 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;
+
+  // 1:1 relationship between PrintPreviewUI and preview data.
+  // Key: Print preview UI address string.
+  // Value: Preview data.
+  typedef std::map<std::string, PrintPreviewData> PreviewDataSrcMap;
+
+  PrintPreviewDataManager();
+
+  // Get the data entry from PreviewDataSrcMap.
+  void GetDataEntry(const std::string& preview_ui_addr_str,
+                    PrintPreviewData* data);
+
+  // Set/Update the data entry in PreviewDataSrcMap.
+  void SetDataEntry(const std::string& preview_ui_addr_str,
+                    const PrintPreviewData& data);
+
+  // Remove the corresponding PrintPreviewUI entry from the map.
+  void RemoveEntry(const std::string& preview_ui_addr_str);
+
+ private:
+  friend class base::RefCounted<PrintPreviewDataManager>;
+
+  virtual ~PrintPreviewDataManager();
+
+  PreviewDataSrcMap data_source_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewDataManager);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_DATA_MANAGER_H_