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770aa71839
This shouldn't be necessary, but sometimes it is. git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@31014 a592a061-630c-0410-9148-cb99ea01b6c8
115 lines
3.1 KiB
C++
115 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 <boost/signal.hpp>
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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();
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/// The image is not transformed, just displayed as-is.
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Loader(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 & file_with_path, Params const &);
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///
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Loader(Loader const &);
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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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/** Returns the check checksum of filename() so that, for example, you can
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* ascertain whether to output a new PostScript version of the file
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* for a LaTeX run.
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*/
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unsigned long checksum() 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 boost::signal<void()> sig_type;
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typedef sig_type::slot_type slot_type;
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///
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boost::signals::connection connect(slot_type 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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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 * const 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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