mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-11 13:46:43 +00:00
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
|
// -*- C++ -*-
|
||
|
|
/**
|
||
|
|
* \file PreviewLoader.h
|
||
|
|
* Copyright 2002 the LyX Team
|
||
|
|
* Read the file COPYING
|
||
|
|
*
|
||
|
|
* \author Angus Leeming <a.leeming@ic.ac.uk>
|
||
|
|
*
|
||
|
|
* grfx::PreviewLoader collects latex snippets together. Then, on a
|
||
|
|
* startLoading() call, these are dumped to file and processed, converting
|
||
|
|
* each snippet to a separate bitmap image file. Once a bitmap file is ready
|
||
|
|
* to be loaded back into LyX, the PreviewLoader emits a readyToDisplay signal
|
||
|
|
* to inform the initiating process.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef PREVIEWLOADER_H
|
||
|
|
#define PREVIEWLOADER_H
|
||
|
|
|
||
|
|
#ifdef __GNUG__
|
||
|
|
#pragma interface
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "LString.h"
|
||
|
|
#include <boost/utility.hpp>
|
||
|
|
#include <boost/scoped_ptr.hpp>
|
||
|
|
#include <boost/signals/signal1.hpp>
|
||
|
|
|
||
|
|
class Buffer;
|
||
|
|
|
||
|
|
namespace grfx {
|
||
|
|
|
||
|
|
class PreviewImage;
|
||
|
|
|
||
|
|
class PreviewLoader : boost::noncopyable {
|
||
|
|
public:
|
||
|
|
/** We need buffer because we require the preamble to the
|
||
|
|
* LaTeX file.
|
||
|
|
*/
|
||
|
|
PreviewLoader(Buffer const & buffer);
|
||
|
|
///
|
||
|
|
~PreviewLoader();
|
||
|
|
|
||
|
|
/** Is there an image already associated with this snippet of LaTeX?
|
||
|
|
* If so, returns a pointer to it, else returns 0.
|
||
|
|
*/
|
||
|
|
PreviewImage const * preview(string const & latex_snippet) const;
|
||
|
|
|
||
|
|
///
|
||
|
|
enum Status {
|
||
|
|
///
|
||
|
|
NotFound,
|
||
|
|
///
|
||
|
|
InQueue,
|
||
|
|
///
|
||
|
|
Processing,
|
||
|
|
///
|
||
|
|
Ready
|
||
|
|
};
|
||
|
|
|
||
|
|
/// How far have we got in loading the image?
|
||
|
|
Status status(string const & latex_snippet) const;
|
||
|
|
|
||
|
|
/// Add a snippet of LaTeX to the queue for processing.
|
||
|
|
void add(string const & latex_snippet);
|
||
|
|
|
||
|
|
/// Remove this snippet of LaTeX from the PreviewLoader.
|
||
|
|
void remove(string const & latex_snippet);
|
||
|
|
|
||
|
|
/** We have accumulated several latex snippets with status "InQueue".
|
||
|
|
* Initiate their transformation into bitmap images.
|
||
|
|
*/
|
||
|
|
void startLoading();
|
||
|
|
|
||
|
|
/// Emit this signal when an image is ready for display.
|
||
|
|
boost::signal1<void, PreviewImage const &> imageReady;
|
||
|
|
|
||
|
|
private:
|
||
|
|
/// Use the Pimpl idiom to hide the internals.
|
||
|
|
class Impl;
|
||
|
|
/// The pointer never changes although *pimpl_'s contents may.
|
||
|
|
boost::scoped_ptr<Impl> const pimpl_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace grfx
|
||
|
|
|
||
|
|
#endif // PREVIEWLOADER_H
|