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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.
117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
// -*- C++ -*-
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/**
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* \file GraphicsLoader.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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* The public face of the graphics cache.
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*
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* * The user supplies an image file and the display parameters.
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* * He can change the file or the display parameters through a reset() method.
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* * He must start the loading process explicitly with startLoading().
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* * If he is connected through the connect() method, then he'll be informed
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* when the loading status changes.
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* * When (status() == Ready), he can use image() to access the loaded image
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* and pass it to the Painter.
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*
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* What could be simpler?
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*/
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#ifndef GRAPHICSLOADER_H
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#define GRAPHICSLOADER_H
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#include "GraphicsTypes.h"
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#include "support/signals.h"
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namespace lyx {
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namespace support { class FileName; }
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namespace graphics {
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class Image;
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class Params;
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class Loader {
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public:
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/// Must use the reset methods to make this instance usable.
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Loader(support::FileName const & doc_file);
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/// The image is not transformed, just displayed as-is.
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Loader(support::FileName const & doc_file, support::FileName const & file_with_path, bool display = true);
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/// The image is transformed before display.
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Loader(support::FileName const & doc_file, support::FileName const & file_with_path, Params const &);
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///
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Loader(support::FileName const & doc_file, Loader const &);
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///
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Loader(Loader const & other);
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/// Needed for the pimpl
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~Loader();
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Loader & operator=(Loader const &);
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/// The file can be changed, or the display params, or both.
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void reset(support::FileName const & file_with_path, bool display = true) const;
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///
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void reset(support::FileName const & file_with_path, Params const &) const;
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///
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void reset(Params const &) const;
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/// Returns the absolute path of the loaded (loading?) file.
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support::FileName const & filename() const;
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///
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/** starting loading of the image is done by a urgency-based
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* decision. Here we only call LoaderQueue::touch to request it.
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*/
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void startLoading() const;
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/** Tries to reload the image.
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*/
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void reload() const;
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/** Monitor any changes to the file.
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* There is no point monitoring the file before startLoading() is
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* invoked.
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*/
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void startMonitoring() const;
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///
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bool monitoring() const;
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///
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void checkModifiedAsync() const;
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/// How far have we got in loading the image?
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ImageStatus status() const;
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/** Connect and you'll be informed when the loading status of the image
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* changes.
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*/
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typedef signals2::signal<void()> 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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/** The loaded image with Pixmap set.
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* If the Pixmap is not yet set (see status() for why...), returns 0.
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*/
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Image const * image() const;
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double displayPixelRatio() const;
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void setDisplayPixelRatio(double scale);
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private:
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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 * pimpl_;
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};
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} // namespace graphics
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} // namespace lyx
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#endif // GRAPHICSLOADER_H
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