src/graphics/PreviewImage.cpp

   1 /**
   2  * \file PreviewImage.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Angus Leeming
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "PreviewImage.h"
  14 #include "GraphicsImage.h"
  15 #include "GraphicsLoader.h"
  16 #include "PreviewLoader.h"
  17
  18 #include "support/FileName.h"
  19
  20 #include <boost/bind.hpp>
  21
  22 using namespace std;
  23 using namespace lyx::support;
  24
  25 namespace lyx {
  26 namespace graphics {
  27
  28 class PreviewImage::Impl : public boost::signals::trackable {
  29 public:
  30         ///
  31         Impl(PreviewImage & p, PreviewLoader & l,
  32              string const & s, FileName const & f, double af);
  33         ///
  34         ~Impl();
  35         ///
  36         Image const * image();
  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                            FileName const & f,
  56                            double af)
  57         : pimpl_(new Impl(*this, l, s, f, af))
  58 {}
  59
  60
  61 PreviewImage::~PreviewImage()
  62 {
  63         delete pimpl_;
  64 }
  65
  66
  67 string const & PreviewImage::snippet() const
  68 {
  69         return pimpl_->snippet_;
  70 }
  71
  72
  73 Dimension PreviewImage::dim() const
  74 {
  75         Dimension dim;
  76         Image const * const image = pimpl_->iloader_.image();
  77         if (!image)
  78                 return dim;
  79
  80         dim.asc = int(pimpl_->ascent_frac_ * double(image->height()));
  81         dim.des = image->height() - dim.asc;
  82         dim.wid = image->width();
  83         return dim;
  84 }
  85
  86
  87 Image const * PreviewImage::image() const
  88 {
  89         return pimpl_->image();
  90 }
  91
  92
  93 PreviewImage::Impl::Impl(PreviewImage & p, PreviewLoader & l,
  94                          string const & s,
  95                          FileName const & bf,
  96                          double af)
  97         : parent_(p), ploader_(l), iloader_(bf),
  98           snippet_(s), ascent_frac_(af)
  99 {
 100         iloader_.connect(boost::bind(&Impl::statusChanged, this));
 101 }
 102
 103
 104 PreviewImage::Impl::~Impl()
 105 {
 106         iloader_.filename().removeFile();
 107 }
 108
 109
 110 Image const * PreviewImage::Impl::image()
 111 {
 112         if (iloader_.status() == WaitingToLoad)
 113                 iloader_.startLoading();
 114
 115         return iloader_.image();
 116 }
 117
 118
 119 void PreviewImage::Impl::statusChanged()
 120 {
 121         switch (iloader_.status()) {
 122         case WaitingToLoad:
 123         case Loading:
 124         case Converting:
 125         case Loaded:
 126         case ScalingEtc:
 127                 break;
 128
 129         case ErrorNoFile:
 130         case ErrorConverting:
 131         case ErrorLoading:
 132         case ErrorGeneratingPixmap:
 133         case ErrorUnknown:
 134                 //iloader_.filename().removeFile();
 135                 ploader_.remove(snippet_);
 136                 break;
 137
 138         case Ready:
 139                 iloader_.filename().removeFile();
 140                 break;
 141         }
 142         ploader_.emitSignal(parent_);
 143 }
 144
 145 } // namespace graphics
 146 } // namespace lyx