Change the ChromiumPasteboard to have a notion of an alternate clipboard...

base/clipboard.h

 // Copyright (c) 2009 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 BASE_CLIPBOARD_H_
 #define BASE_CLIPBOARD_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 56 matching lines @@
   // CBF_BITMAP    pixels       byte array
   //               size         gfx::Size struct
   // CBF_SMBITMAP  shared_mem   shared memory handle
   //               size         gfx::Size struct
   // CBF_DATA      format       char array
   //               data         byte array
   typedef std::vector<char> ObjectMapParam;
   typedef std::vector<ObjectMapParam> ObjectMapParams;
   typedef std::map<int /* ObjectType */, ObjectMapParams> ObjectMap;
 
+  // Buffer designates which clipboard the action should be applied to.
+  // Only platforms that use the X Window System support the selection
+  // buffer. Furthermore we currently only use a buffer other than the
+  // standard buffer when reading from the clipboard so only those
+  // functions accept a buffer parameter.
+  enum Buffer {
+    BUFFER_STANDARD,
+#if defined(OS_LINUX)
+    BUFFER_SELECTION,
+#endif
+  };
+
+  static bool IsValidBuffer(int32 buffer) {
+    switch (buffer) {
+      case BUFFER_STANDARD:
+        return true;
+#if defined(OS_LINUX)
+      case BUFFER_SELECTION:
+        return true;
+#endif
+    }
+    return false;
+  }
+
+  static Buffer FromInt(int32 buffer) {
+    return static_cast<Buffer>(buffer);
+  }
+
   Clipboard();
   ~Clipboard();
 
   // Write a bunch of objects to the system clipboard. Copies are made of the
   // contents of |objects|. On Windows they are copied to the system clipboard.
   // On linux they are copied into a structure owned by the Clipboard object and
   // kept until the system clipboard is set again.
   void WriteObjects(const ObjectMap& objects);
 
   // Behaves as above. If there is some shared memory handle passed as one of
   // the objects, it came from the process designated by |process|. This will
   // assist in turning it into a shared memory region that the current process
   // can use.
   void WriteObjects(const ObjectMap& objects, base::ProcessHandle process);
 
   // Tests whether the clipboard contains a certain format
-  bool IsFormatAvailable(const FormatType& format) const;
+  bool IsFormatAvailable(const FormatType& format, Buffer buffer) const;
 
   // As above, but instead of interpreting |format| by some platform-specific
   // definition, interpret it as a literal MIME type.
-  bool IsFormatAvailableByString(const std::string& format) const;
+  bool IsFormatAvailableByString(const std::string& format,
+                                 Buffer buffer) const;
 
   // Reads UNICODE text from the clipboard, if available.
-  void ReadText(string16* result) const;
+  void ReadText(Buffer buffer, string16* result) const;
 
   // Reads ASCII text from the clipboard, if available.
-  void ReadAsciiText(std::string* result) const;
+  void ReadAsciiText(Buffer buffer, std::string* result) const;
 
   // Reads HTML from the clipboard, if available.
-  void ReadHTML(string16* markup, std::string* src_url) const;
+  void ReadHTML(Buffer buffer, string16* markup, std::string* src_url) const;
 
   // Reads a bookmark from the clipboard, if available.
   void ReadBookmark(string16* title, std::string* url) const;
 
   // Reads a file or group of files from the clipboard, if available, into the
   // out parameter.
   void ReadFile(FilePath* file) const;
   void ReadFiles(std::vector<FilePath>* files) const;
 
   // Reads raw data from the clipboard with the given format type. Stores result
@@ skipping 89 matching lines @@
   // SetGtkClipboard function replaces whatever is on the system clipboard with
   // the contents of |clipboard_data_|.
   // The Write* functions make a deep copy of the data passed to them an store
   // it in |clipboard_data_|.
 
   // Write changes to gtk clipboard.
   void SetGtkClipboard();
   // Insert a mapping into clipboard_data_.
   void InsertMapping(const char* key, char* data, size_t data_len);
 
+  // find the gtk clipboard for the passed buffer enum
+  GtkClipboard* LookupBackingClipboard(Buffer clipboard) const;
+
   TargetMap* clipboard_data_;
   GtkClipboard* clipboard_;
+  GtkClipboard* primary_selection_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Clipboard);
 };
 
 #endif  // BASE_CLIPBOARD_H_