src/graphics/PreviewImage.h

   1 // -*- C++ -*-
   2 /**
   3  * \file PreviewImage.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author Angus Leeming
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #ifndef PREVIEWIMAGE_H
  13 #define PREVIEWIMAGE_H
  14
  15 #include "support/strfwd.h"
  16
  17 namespace lyx {
  18
  19 namespace support { class FileName; }
  20
  21 class Dimension;
  22
  23 namespace graphics {
  24
  25 class PreviewLoader;
  26 class Image;
  27
  28 class PreviewImage {
  29 public:
  30         /** ascent = height * ascent_frac
  31          *  descent = height * (1 - ascent_frac)
  32          */
  33         PreviewImage(PreviewLoader & parent,
  34                      std::string const & latex_snippet,
  35                      support::FileName const & bitmap_file,
  36                      double ascent_frac);
  37         ///
  38         ~PreviewImage();
  39
  40         ///
  41         std::string const & snippet() const;
  42         ///
  43         Dimension dim() const;
  44
  45         /** If the image is not yet loaded (WaitingToLoad), then this method
  46          *  triggers that.
  47          */
  48         Image const * image() const;
  49
  50 private:
  51         /// Use the Pimpl idiom to hide the internals.
  52         class Impl;
  53         /// The pointer never changes although *pimpl_'s contents may.
  54         Impl * const pimpl_;
  55 };
  56
  57 } // namespace graphics
  58 } // namespace lyx
  59
  60 #endif // PREVIEWIMAGE_H