4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Angus Leeming
9 * Full author contact details are available in file CREDITS
11 * grfx::Previews is a singleton class that stores the grfx::PreviewLoader
12 * for each buffer requiring one.
19 #include <boost/utility.hpp>
20 #include <boost/scoped_ptr.hpp>
28 class Previews : boost::noncopyable {
30 /// a wrapper for lyxrc.preview
31 static bool activated();
33 /// This is a singleton class. Get the instance.
34 static Previews & get();
36 /** Returns the PreviewLoader for this buffer.
37 * Used by individual insets to update their own preview.
38 * We assert that (buffer != 0) but do not pass a Buffer &
39 * so that insets do not need to #include buffer.h
41 PreviewLoader & loader(Buffer const * buffer) const;
43 /** Called from the Buffer d-tor.
44 * If (buffer == 0), does nothing.
46 void removeLoader(Buffer const * buffer) const;
48 /** For a particular buffer, initiate the generation of previews
49 * for each and every snippetof LaTeX that's of interest with
50 * a single forked process.
51 * If (buffer == 0), does nothing.
53 void generateBufferPreviews(Buffer const & buffer) const;
56 /** Make the c-tor, d-tor private so we can control how many objects
63 /// Use the Pimpl idiom to hide the internals.
65 /// The pointer never changes although *pimpl_'s contents may.
66 boost::scoped_ptr<Impl> const pimpl_;