src/graphics/PreviewImage.C

   1 /**
   2  *  \file PreviewImage.C
   3  *  Copyright 2002 the LyX Team
   4  *  Read the file COPYING
   5  *
   6  * \author Angus Leeming <a.leeming@ic.ac.uk>
   7  */
   8
   9 #include <config.h>
  10
  11 #ifdef __GNUG__
  12 #pragma implementation
  13 #endif
  14
  15 #include "PreviewImage.h"
  16 #include "PreviewLoader.h"
  17 #include "GraphicsImage.h"
  18 #include "GraphicsLoader.h"
  19
  20 #include "debug.h"
  21
  22 #include "support/lyxlib.h"
  23
  24 #include <boost/bind.hpp>
  25 #include <boost/signals/trackable.hpp>
  26
  27
  28 namespace grfx {
  29
  30 struct PreviewImage::Impl : public boost::signals::trackable {
  31         ///
  32         Impl(PreviewImage & p, PreviewLoader & l,
  33              string const & s, string const & f, double af);
  34         ///
  35         ~Impl();
  36         ///
  37         void startLoading();
  38         ///
  39         Image const * image() const { return iloader_->image(); }
  40         ///
  41         void statusChanged();
  42
  43         ///
  44         PreviewImage const & parent_;
  45         ///
  46         PreviewLoader & ploader_;
  47         ///
  48         boost::scoped_ptr<Loader> const iloader_;
  49         ///
  50         string const snippet_;
  51         ///
  52         double const ascent_frac_;
  53 };
  54
  55
  56 PreviewImage::PreviewImage(PreviewLoader & l,
  57                            string const & s,
  58                            string const & f,
  59                            double af)
  60         : pimpl_(new Impl(*this, l, s, f, af))
  61 {}
  62
  63
  64 PreviewImage::~PreviewImage()
  65 {}
  66
  67
  68 void PreviewImage::startLoading()
  69 {
  70         return pimpl_->startLoading();
  71 }
  72
  73
  74 string const & PreviewImage::snippet() const
  75 {
  76         return pimpl_->snippet_;
  77 }
  78
  79 int PreviewImage::ascent() const
  80 {
  81         Image const * const image = pimpl_->image();
  82         if (!image)
  83                 return 0;
  84
  85         return int(pimpl_->ascent_frac_ * double(image->getHeight()));
  86 }
  87
  88
  89 int PreviewImage::descent() const
  90 {
  91         Image const * const image = pimpl_->image();
  92         if (!image)
  93                 return 0;
  94
  95         return int((1.0 - pimpl_->ascent_frac_) * double(image->getHeight()));
  96 }
  97
  98
  99 int PreviewImage::width() const
 100 {
 101         Image const * const image = pimpl_->image();
 102         return image ? image->getWidth() : 0;
 103 }
 104
 105
 106 Image const * PreviewImage::image() const
 107 {
 108         return pimpl_->image();
 109 }
 110
 111
 112 PreviewImage::Impl::Impl(PreviewImage & p, PreviewLoader & l,
 113                          string const & s,
 114                          string const & bf,
 115                          double af)
 116         : parent_(p), ploader_(l), iloader_(new Loader(bf)),
 117           snippet_(s), ascent_frac_(af)
 118 {}
 119
 120
 121 PreviewImage::Impl::~Impl()
 122 {
 123         lyx::unlink(iloader_->filename());
 124 }
 125
 126
 127 void PreviewImage::Impl::startLoading()
 128 {
 129         if (iloader_->status() != WaitingToLoad)
 130                 return;
 131
 132         iloader_->statusChanged.connect(
 133                 boost::bind(&Impl::statusChanged, this));
 134         iloader_->startLoading();
 135 }
 136
 137
 138 void PreviewImage::Impl::statusChanged()
 139 {
 140         switch (iloader_->status()) {
 141         case WaitingToLoad:
 142         case Loading:
 143         case Converting:
 144         case Loaded:
 145         case ScalingEtc:
 146                 break;
 147
 148         case ErrorNoFile:
 149         case ErrorConverting:
 150         case ErrorLoading:
 151         case ErrorGeneratingPixmap:
 152         case ErrorUnknown:
 153                 //lyx::unlink(iloader_->filename());
 154                 ploader_.remove(snippet_);
 155                 break;
 156
 157         case Ready:
 158                 lyx::unlink(iloader_->filename());
 159                 ploader_.imageReady(parent_);
 160                 break;
 161         }
 162 }
 163
 164 } // namespace grfx