src/graphics/PreviewImage.C

   1 /**
   2  *  \file PreviewImage.C
   3  *  Read the file COPYING
   4  *
   5  * \author Angus Leeming
   6  *
   7  * Full author contact details available in file CREDITS
   8  */
   9
  10 #include <config.h>
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "PreviewImage.h"
  17 #include "PreviewLoader.h"
  18 #include "GraphicsImage.h"
  19 #include "GraphicsLoader.h"
  20
  21 #include "support/lyxlib.h"
  22
  23 #include <boost/bind.hpp>
  24 #include <boost/signals/trackable.hpp>
  25
  26
  27 namespace grfx {
  28
  29 struct PreviewImage::Impl : public boost::signals::trackable {
  30         ///
  31         Impl(PreviewImage & p, PreviewLoader & l,
  32              string const & s, string const & f, double af);
  33         ///
  34         ~Impl();
  35         ///
  36         Image const * image(Inset const &, BufferView const &);
  37         ///
  38         void statusChanged();
  39
  40         ///
  41         PreviewImage const & parent_;
  42         ///
  43         PreviewLoader & ploader_;
  44         ///
  45         Loader iloader_;
  46         ///
  47         string const snippet_;
  48         ///
  49         double const ascent_frac_;
  50 };
  51
  52
  53 PreviewImage::PreviewImage(PreviewLoader & l,
  54                            string const & s,
  55                            string const & f,
  56                            double af)
  57         : pimpl_(new Impl(*this, l, s, f, af))
  58 {}
  59
  60
  61 PreviewImage::~PreviewImage()
  62 {}
  63
  64
  65 string const & PreviewImage::snippet() const
  66 {
  67         return pimpl_->snippet_;
  68 }
  69
  70
  71 int PreviewImage::ascent() const
  72 {
  73         Image const * const image = pimpl_->iloader_.image();
  74         if (!image)
  75                 return 0;
  76
  77         return int(pimpl_->ascent_frac_ * double(image->getHeight()));
  78 }
  79
  80
  81 int PreviewImage::descent() const
  82 {
  83         Image const * const image = pimpl_->iloader_.image();
  84         if (!image)
  85                 return 0;
  86
  87         // Avoids rounding errors.
  88         return image->getHeight() - ascent();
  89 }
  90
  91
  92 int PreviewImage::width() const
  93 {
  94         Image const * const image = pimpl_->iloader_.image();
  95         return image ? image->getWidth() : 0;
  96 }
  97
  98
  99 Image const * PreviewImage::image(Inset const & inset,
 100                                   BufferView const & bv) const
 101 {
 102         return pimpl_->image(inset, bv);
 103 }
 104
 105
 106 PreviewImage::Impl::Impl(PreviewImage & p, PreviewLoader & l,
 107                          string const & s,
 108                          string const & bf,
 109                          double af)
 110         : parent_(p), ploader_(l), iloader_(bf),
 111           snippet_(s), ascent_frac_(af)
 112 {
 113         iloader_.connect(boost::bind(&Impl::statusChanged, this));
 114 }
 115
 116
 117 PreviewImage::Impl::~Impl()
 118 {
 119         lyx::unlink(iloader_.filename());
 120 }
 121
 122
 123 Image const * PreviewImage::Impl::image(Inset const & inset,
 124                                         BufferView const & bv)
 125 {
 126         if (iloader_.status() == WaitingToLoad)
 127                 iloader_.startLoading(inset, bv);
 128
 129         return iloader_.image();
 130 }
 131
 132
 133 void PreviewImage::Impl::statusChanged()
 134 {
 135         switch (iloader_.status()) {
 136         case WaitingToLoad:
 137         case Loading:
 138         case Converting:
 139         case Loaded:
 140         case ScalingEtc:
 141                 break;
 142
 143         case ErrorNoFile:
 144         case ErrorConverting:
 145         case ErrorLoading:
 146         case ErrorGeneratingPixmap:
 147         case ErrorUnknown:
 148                 //lyx::unlink(iloader_.filename());
 149                 ploader_.remove(snippet_);
 150                 break;
 151
 152         case Ready:
 153                 lyx::unlink(iloader_.filename());
 154                 ploader_.emitSignal(parent_);
 155                 break;
 156         }
 157 }
 158
 159 } // namespace grfx