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https://git.lyx.org/repos/lyx.git
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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.
146 lines
3.9 KiB
C++
146 lines
3.9 KiB
C++
// -*- C++ -*-
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/**
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* \file RenderPreview.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::RenderPreview is an abstract base class that can help
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* insets to generate previews. The daughter class must instantiate two small
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* methods. The Inset would own an instance of this daughter class.
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*/
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#ifndef RENDERPREVIEW_H
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#define RENDERPREVIEW_H
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#include "RenderBase.h"
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#include "support/docstring.h"
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#include "support/FileMonitor.h"
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#include "support/FileName.h"
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#include "support/signals.h"
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namespace lyx {
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class Buffer;
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class MetricsInfo;
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class PainterInfo;
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namespace graphics {
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class PreviewImage;
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class PreviewLoader;
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} // namespace graphics
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class RenderPreview : public RenderBase {
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public:
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/// Return true if preview is enabled in text (from LyXRC::preview)
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static bool previewText();
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/// Return true if preview is enabled in mathed (from LyXRC::preview)
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static bool previewMath();
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RenderPreview(Inset const *);
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RenderPreview(RenderPreview const &, Inset const *);
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RenderBase * clone(Inset const *) const;
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/// Compute the size of the object, returned in dim
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void metrics(MetricsInfo &, Dimension & dim) const;
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///
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void draw(PainterInfo & pi, int x, int y) const;
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/** Find the PreviewLoader and add a LaTeX snippet to it.
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* Do not start the loading process.
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* \param ignore_lyxrc: generate the preview no matter what LyXRC says
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*/
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void addPreview(docstring const & latex_snippet, Buffer const &,
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bool ignore_lyxrc = false);
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/** Add a LaTeX snippet to the PreviewLoader.
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* Do not start the loading process.
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* \param ignore_lyxrc: generate the preview no matter what LyXRC says
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*/
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void addPreview(docstring const & latex_snippet,
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graphics::PreviewLoader & ploader,
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bool ignore_lyxrc = false);
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/// Begin the loading process.
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/// \param forexport : whether this is intended for export. if so,
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/// then we ignore LyXRC and wait for the image to be generated.
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void startLoading(Buffer const & buffer, bool forexport = false) const;
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/** Remove a snippet from the cache of previews.
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* Useful if previewing the contents of a file that has changed.
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*/
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void removePreview(Buffer const &);
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/** \returns a pointer to the PreviewImage associated with this snippet
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* of latex.
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*/
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graphics::PreviewImage const *
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getPreviewImage(Buffer const & buffer) const;
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/// equivalent to dynamic_cast
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virtual RenderPreview * asPreview() { return this; }
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private:
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/// Not implemented.
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RenderPreview & operator=(RenderPreview const &);
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/// This method is connected to the PreviewLoader::imageReady signal.
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void imageReady(graphics::PreviewImage const &);
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/// The thing that we're trying to generate a preview of.
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std::string snippet_;
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/** Store the connection to the preview loader so that we connect
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* only once.
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*/
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signals2::scoped_connection ploader_connection_;
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/// Inform the core that the inset has changed.
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Inset const * parent_;
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};
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class RenderMonitoredPreview : public RenderPreview {
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public:
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RenderMonitoredPreview(Inset const *);
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///
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void draw(PainterInfo & pi, int x, int y) const;
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///
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void setAbsFile(support::FileName const & file);
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///
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bool monitoring() const;
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void startMonitoring() const;
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void stopMonitoring() const;
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/// Connect and you'll be informed when the file changes.
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/// Do not forget to track objects used by the slot.
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typedef signals2::signal<void()> sig;
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typedef sig::slot_type slot;
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signals2::connection connect(slot const & slot);
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/// equivalent to dynamic_cast
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virtual RenderMonitoredPreview * asMonitoredPreview() { return this; }
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private:
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/// This signal is emitted if the file is modified
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sig changed_;
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///
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mutable support::ActiveFileMonitorPtr monitor_;
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///
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support::FileName filename_;
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};
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} // namespace lyx
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#endif // RENDERPREVIEW_H
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