src/graphics/Previews.C

   1 /**
   2  *  \file Previews.C
   3  *  Read the file COPYING
   4  *
   5  * \author Angus Leeming
   6  *
   7  * Full author contact details available in file CREDITS
   8  */
   9
  10 #include <config.h>
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "Previews.h"
  17 #include "PreviewLoader.h"
  18
  19 #include "buffer.h"
  20 #include "lyxrc.h"
  21
  22 #include "insets/inset.h"
  23
  24 #include "support/LAssert.h"
  25
  26 #include <map>
  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 const *, 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 const * buffer) const
  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 const * buffer) const
  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 const & buffer) const
  91 {
  92         PreviewLoader & ploader = loader(&buffer);
  93
  94         Buffer::inset_iterator it  = buffer.inset_const_iterator_begin();
  95         Buffer::inset_iterator end = buffer.inset_const_iterator_end();
  96
  97         for (; it != end; ++it)
  98                 it->addPreview(ploader);
  99
 100         ploader.startLoading();
 101 }
 102
 103 } // namespace grfx