3 * \file PreviewedInset.h
4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Angus Leeming
9 * Full author contact details are available in file CREDITS.
11 * lyx::graphics::PreviewedInset is an abstract base class that can help
12 * insets to generate previews. The daughter class must instantiate two small
13 * methods. The Inset would own an instance of this daughter class.
16 #ifndef PREVIEWEDINSET_H
17 #define PREVIEWEDINSET_H
19 #include "support/std_string.h"
20 #include <boost/signals/trackable.hpp>
21 #include <boost/signals/connection.hpp>
32 class PreviewedInset : public boost::signals::trackable {
34 /// a wrapper for Previews::activated()
35 static bool activated();
38 PreviewedInset(InsetOld & inset);
40 /** Find the PreviewLoader, add a LaTeX snippet to it and
41 * start the loading process.
43 void generatePreview();
45 /** Add a LaTeX snippet to the PreviewLoader but do not start the
48 void addPreview(PreviewLoader & ploader);
50 /** Remove a snippet from the cache of previews.
51 * Useful if previewing the contents of a file that has changed.
55 /// The preview has been generated and is ready to use.
56 bool previewReady() const;
58 /// If !previewReady() returns 0.
59 PreviewImage const * pimage() const;
63 virtual ~PreviewedInset() {}
64 /// Allow the daughter classes to cast up to the parent inset.
65 InsetOld const & inset() const;
67 BufferView * view() const;
70 /// This method is connected to the PreviewLoader::imageReady signal.
71 void imageReady(PreviewImage const &) const;
73 /// Does the owning inset want a preview?
74 virtual bool previewWanted() const = 0;
75 /// a wrapper to Inset::latex
76 virtual string const latexString() const = 0;
83 /// We don't own this. Cached for efficiency reasons.
84 mutable PreviewImage const * pimage_;
86 boost::signals::connection connection_;
91 PreviewImage const * PreviewedInset::pimage() const
98 InsetOld const & PreviewedInset::inset() const
103 } // namespace graphics
106 #endif // PREVIEWEDINSET_H