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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef REMOTING_PROTOCOL_CLIPBOARD_ECHO_FILTER_H_
      6 #define REMOTING_PROTOCOL_CLIPBOARD_ECHO_FILTER_H_
      7 
      8 #include <map>
      9 #include <string>
     10 
     11 #include "base/compiler_specific.h"
     12 #include "remoting/protocol/clipboard_stub.h"
     13 
     14 namespace remoting {
     15 namespace protocol {
     16 
     17 // ClipboardEchoFilter stops the host sending a clipboard item to the
     18 // client, if that item was the latest item received from the client.
     19 class ClipboardEchoFilter {
     20  public:
     21   ClipboardEchoFilter();
     22   ~ClipboardEchoFilter();
     23 
     24   // Sets the ClipboardStub that sends events to the client.
     25   void set_client_stub(ClipboardStub* client_stub);
     26 
     27   // Sets the ClipboardStub that sends events to the host.
     28   void set_host_stub(ClipboardStub* host_stub);
     29 
     30   // Gets the ClipboardStub that sends events through this filter and on to the
     31   // client.
     32   ClipboardStub* client_filter();
     33 
     34   // Gets the ClipboardStub that sends events through this filter and on to the
     35   // host.
     36   ClipboardStub* host_filter();
     37 
     38  private:
     39   class ClientFilter : public ClipboardStub {
     40    public:
     41     ClientFilter(ClipboardEchoFilter* filter);
     42     virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
     43 
     44    private:
     45     ClipboardEchoFilter* filter_;
     46   };
     47 
     48   class HostFilter : public ClipboardStub {
     49    public:
     50     HostFilter(ClipboardEchoFilter* filter);
     51     virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
     52 
     53    private:
     54     ClipboardEchoFilter* filter_;
     55   };
     56 
     57   void InjectClipboardEventToHost(const ClipboardEvent& event);
     58   void InjectClipboardEventToClient(const ClipboardEvent& event);
     59 
     60   ClipboardStub* host_stub_;
     61   ClipboardStub* client_stub_;
     62   ClientFilter client_filter_;
     63   HostFilter host_filter_;
     64 
     65   // The latest item received from the client.
     66   std::string client_latest_mime_type_;
     67   std::string client_latest_data_;
     68 
     69   DISALLOW_COPY_AND_ASSIGN(ClipboardEchoFilter);
     70 };
     71 
     72 }  // namespace protocol
     73 }  // namespace remoting
     74 
     75 #endif  // REMOTING_PROTOCOL_CLIPBOARD_ECHO_FILTER_H_
     76