lyx_mirror/src/graphics/Previews.C

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/**
* \file Previews.C
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Angus Leeming
*
* Full author contact details are available in file CREDITS
*/
#include <config.h>
#include "Previews.h"
#include "PreviewLoader.h"
#include "buffer.h"
#include "lyxrc.h"
#include "insets/inset.h"
#include "support/LAssert.h"
#include <map>
using namespace lyx::support;
namespace grfx {
bool Previews::activated()
{
return lyxrc.preview;
}
Previews & Previews::get()
{
static Previews singleton;
return singleton;
}
struct Previews::Impl {
///
typedef boost::shared_ptr<PreviewLoader> PreviewLoaderPtr;
///
typedef std::map<Buffer const *, PreviewLoaderPtr> CacheType;
///
CacheType cache;
};
Previews::Previews()
: pimpl_(new Impl())
{}
Previews::~Previews()
{}
PreviewLoader & Previews::loader(Buffer const * buffer) const
{
Assert(buffer);
Impl::CacheType::iterator it = pimpl_->cache.find(buffer);
if (it == pimpl_->cache.end()) {
Impl::PreviewLoaderPtr ptr(new PreviewLoader(*buffer));
pimpl_->cache[buffer] = ptr;
return *ptr.get();
}
return *it->second.get();
}
void Previews::removeLoader(Buffer const * buffer) const
{
if (!buffer)
return;
Impl::CacheType::iterator it = pimpl_->cache.find(buffer);
if (it != pimpl_->cache.end())
pimpl_->cache.erase(it);
}
void Previews::generateBufferPreviews(Buffer const & buffer) const
{
PreviewLoader & ploader = loader(&buffer);
Buffer::inset_iterator it = buffer.inset_const_iterator_begin();
Buffer::inset_iterator end = buffer.inset_const_iterator_end();
for (; it != end; ++it)
it->addPreview(ploader);
ploader.startLoading();
}
} // namespace grfx