src/graphics/Previews.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Previews.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author Angus Leeming
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  *
  11  * graphics::Previews is a singleton class that stores the
  12  * graphics::PreviewLoader for each buffer requiring one.
  13  */
  14
  15 #ifndef PREVIEWS_H
  16 #define PREVIEWS_H
  17
  18 namespace lyx {
  19
  20 class Buffer;
  21 class LyXRC_PreviewStatus;
  22
  23 namespace graphics {
  24
  25 class PreviewLoader;
  26
  27 class Previews {
  28 public:
  29         /// This should be a singleton class only instanciated in LyX.cpp.
  30         Previews() {}
  31
  32         /// a wrapper for lyxrc.preview
  33         static LyXRC_PreviewStatus status();
  34
  35         /** Returns the PreviewLoader for this buffer.
  36          *  Used by individual insets to update their own preview.
  37          */
  38         PreviewLoader & loader(Buffer const & buffer) const;
  39
  40         /// Called from the Buffer d-tor.
  41         void removeLoader(Buffer const & buffer) const;
  42
  43         /** For a particular buffer, initiate the generation of previews
  44          *  for each and every snippet of LaTeX that's of interest with
  45          *  a single forked process.
  46          */
  47         void generateBufferPreviews(Buffer const & buffer) const;
  48
  49 private:
  50         /// noncopyable
  51         Previews(Previews const &);
  52         void operator=(Previews const &);
  53 };
  54
  55 } // namespace graphics
  56
  57 /// This is a singleton class. Get the instance.
  58 /// Implemented in LyX.cpp.
  59 graphics::Previews & thePreviews();
  60
  61 } // namespace lyx
  62
  63 #endif // PREVIEWS_H