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 <a.leeming@ic.ac.uk>
   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
  28 namespace grfx {
  29
  30 bool Previews::activated()
  31 {
  32         return lyxrc.preview;
  33 }
  34
  35
  36 Previews & Previews::get()
  37 {
  38         static Previews singleton;
  39         return singleton;
  40 }
  41
  42
  43 struct Previews::Impl {
  44         ///
  45         typedef boost::shared_ptr<PreviewLoader> PreviewLoaderPtr;
  46         ///
  47         typedef std::map<Buffer *, PreviewLoaderPtr> CacheType;
  48         ///
  49         CacheType cache;
  50 };
  51
  52
  53 Previews::Previews()
  54         : pimpl_(new Impl())
  55 {}
  56
  57
  58 Previews::~Previews()
  59 {}
  60
  61
  62 PreviewLoader & Previews::loader(Buffer * buffer)
  63 {
  64         lyx::Assert(buffer);
  65
  66         Impl::CacheType::iterator it = pimpl_->cache.find(buffer);
  67
  68         if (it == pimpl_->cache.end()) {
  69                 Impl::PreviewLoaderPtr ptr(new PreviewLoader(*buffer));
  70                 pimpl_->cache[buffer] = ptr;
  71                 return *ptr.get();
  72         }
  73
  74         return *it->second.get();
  75 }
  76
  77
  78 void Previews::removeLoader(Buffer * buffer)
  79 {
  80         if (!buffer)
  81                 return;
  82
  83         Impl::CacheType::iterator it = pimpl_->cache.find(buffer);
  84
  85         if (it != pimpl_->cache.end())
  86                 pimpl_->cache.erase(it);
  87 }
  88
  89
  90 void Previews::generateBufferPreviews(Buffer * buffer)
  91 {
  92         if (!buffer || !lyxrc.preview)
  93                 return;
  94
  95         PreviewLoader & ploader = loader(buffer);
  96
  97         Buffer::inset_iterator it  = buffer->inset_const_iterator_begin();
  98         Buffer::inset_iterator end = buffer->inset_const_iterator_end();
  99
 100         for (; it != end; ++it) {
 101                 if ((*it)->lyxCode() == Inset::MATH_CODE) {
 102                         (*it)->generatePreview(ploader);
 103                 }
 104         }
 105
 106         ploader.startLoading();
 107 }
 108
 109 } // namespace grfx