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db58111360
Starting at 61b2bd5e, boost::bind was progressively replaced with
std::bind. They are not interchangeable though. boost::bind implements
the tracking of boost::signals{,2}::trackable objects. Now that
std::bind has completely replaced boost::bind, tracking never occurred.
This commit replaces boost::signals2::trackable with the new preferred
boost::signals2 methods: scoped_connections or slot::track_foreign. The
support::Trackable class introduced is less safe but easier for transitioning
old code.
Fixes the crash at #8261.
118 lines
2.9 KiB
C++
118 lines
2.9 KiB
C++
// -*- C++ -*-
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/**
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* \file PreviewLoader.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Angus Leeming
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*
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* Full author contact details are available in file CREDITS.
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*
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* graphics::PreviewLoader collects latex snippets together. Then, on a
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* startLoading() call, these are dumped to file and processed, converting
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* each snippet to a separate bitmap image file. Once a bitmap file is ready
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* to be loaded back into LyX, the PreviewLoader emits a signal to inform
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* the initiating process.
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*/
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#ifndef PREVIEWLOADER_H
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#define PREVIEWLOADER_H
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#include "support/signals.h"
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#include <QObject>
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#include "ColorCode.h"
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namespace lyx {
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class Buffer;
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namespace graphics {
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class PreviewImage;
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class PreviewLoader : public QObject {
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Q_OBJECT
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public:
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/** We need buffer because we require the preamble to the
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* LaTeX file.
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*/
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PreviewLoader(Buffer const & buffer);
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///
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~PreviewLoader();
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/** Is there an image already associated with this snippet of LaTeX?
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* If so, returns a pointer to it, else returns 0.
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*/
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PreviewImage const * preview(std::string const & latex_snippet) const;
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///
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enum Status {
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///
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NotFound,
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///
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InQueue,
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///
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Processing,
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///
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Ready
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};
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/// How far have we got in loading the image?
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Status status(std::string const & latex_snippet) const;
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/// Add a snippet of LaTeX to the queue for processing.
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void add(std::string const & latex_snippet) const;
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/// Remove this snippet of LaTeX from the PreviewLoader.
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void remove(std::string const & latex_snippet) const;
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/** We have accumulated several latex snippets with status "InQueue".
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* Initiate their transformation into bitmap images.
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*/
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void startLoading(bool wait = false) const;
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/** Connect and you'll be informed when the bitmap image file
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* has been created and is ready for loading through
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* lyx::graphics::PreviewImage::image().
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*/
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typedef signals2::signal<void(PreviewImage const &)> sig;
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typedef sig::slot_type slot;
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///
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signals2::connection connect(slot const &) const;
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/** When PreviewImage has finished loading the image file into memory,
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* it tells the PreviewLoader to tell the outside world
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*/
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void emitSignal(PreviewImage const &) const;
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/// Which buffer owns this loader.
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Buffer const & buffer() const;
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/// The background color used
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static ColorCode backgroundColor() { return Color_background; }
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/// The foreground color used
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static ColorCode foregroundColor() { return Color_preview; }
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double displayPixelRatio() const ;
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public Q_SLOTS:
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///
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void refreshPreviews();
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private:
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/// noncopyable
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PreviewLoader(PreviewLoader const &);
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void operator=(PreviewLoader const &);
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/// Use the Pimpl idiom to hide the internals.
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class Impl;
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/// The pointer never changes although *pimpl_'s contents may.
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Impl * const pimpl_;
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};
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} // namespace graphics
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} // namespace lyx
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#endif // PREVIEWLOADER_H
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