src/graphics/Previews.C

   1 /*
   2  *  \file Previews.C
   3  *  Copyright 2002 the LyX Team
   4  *  Read the file COPYING
   5  *
   6  * \author Angus Leeming <leeming@lyx.org>
   7  */
   8
   9 #include <config.h>
  10
  11 #ifdef __GNUG__
  12 #pragma implementation
  13 #endif
  14
  15 #include "Previews.h"
  16 #include "PreviewLoader.h"
  17
  18 #include "buffer.h"
  19 #include "lyxrc.h"
  20
  21 #include "insets/inset.h"
  22
  23 #include "support/LAssert.h"
  24
  25 #include <map>
  26
  27 namespace grfx {
  28
  29 bool Previews::activated()
  30 {
  31         return lyxrc.preview;
  32 }
  33
  34
  35 Previews & Previews::get()
  36 {
  37         static Previews singleton;
  38         return singleton;
  39 }
  40
  41
  42 struct Previews::Impl {
  43         ///
  44         typedef boost::shared_ptr<PreviewLoader> PreviewLoaderPtr;
  45         ///
  46         typedef std::map<Buffer const *, PreviewLoaderPtr> CacheType;
  47         ///
  48         CacheType cache;
  49 };
  50
  51
  52 Previews::Previews()
  53         : pimpl_(new Impl())
  54 {}
  55
  56
  57 Previews::~Previews()
  58 {}
  59
  60
  61 PreviewLoader & Previews::loader(Buffer const * buffer)
  62 {
  63         lyx::Assert(buffer);
  64
  65         Impl::CacheType::iterator it = pimpl_->cache.find(buffer);
  66
  67         if (it == pimpl_->cache.end()) {
  68                 Impl::PreviewLoaderPtr ptr(new PreviewLoader(*buffer));
  69                 pimpl_->cache[buffer] = ptr;
  70                 return *ptr.get();
  71         }
  72
  73         return *it->second.get();
  74 }
  75
  76
  77 void Previews::removeLoader(Buffer const * buffer)
  78 {
  79         if (!buffer)
  80                 return;
  81
  82         Impl::CacheType::iterator it = pimpl_->cache.find(buffer);
  83
  84         if (it != pimpl_->cache.end())
  85                 pimpl_->cache.erase(it);
  86 }
  87
  88
  89 void Previews::generateBufferPreviews(Buffer const & buffer)
  90 {
  91         PreviewLoader & ploader = loader(&buffer);
  92
  93         Buffer::inset_iterator it  = buffer.inset_const_iterator_begin();
  94         Buffer::inset_iterator end = buffer.inset_const_iterator_end();
  95
  96         for (; it != end; ++it) {
  97                 if ((*it)->lyxCode() == Inset::MATH_CODE) {
  98                         (*it)->generatePreview(ploader);
  99                 }
 100         }
 101
 102         ploader.startLoading();
 103 }
 104
 105 } // namespace grfx