src/graphics/PreviewedInset.C

   1 // -*- C++ -*-
   2 /**
   3  *  \file PreviewedInset.C
   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 #include <config.h>
  13
  14 #include "PreviewedInset.h"
  15 #include "GraphicsImage.h"
  16 #include "PreviewLoader.h"
  17 #include "PreviewImage.h"
  18 #include "Previews.h"
  19
  20 #include "buffer.h"
  21 #include "BufferView.h"
  22
  23 #include "frontends/LyXView.h"
  24
  25 #include "support/lstrings.h"
  26
  27 #include <boost/bind.hpp>
  28
  29 #include "debug.h"    // temporary
  30
  31 using namespace lyx::support;
  32
  33 namespace lyx {
  34 namespace graphics {
  35
  36 bool PreviewedInset::activated()
  37 {
  38         return Previews::activated();
  39 }
  40
  41
  42 BufferView * PreviewedInset::view() const
  43 {
  44         return inset_.view();
  45 }
  46
  47
  48 void PreviewedInset::generatePreview()
  49 {
  50         if (!Previews::activated() || !previewWanted() ||
  51             !view() || !view()->buffer())
  52                 return;
  53
  54         Previews & previews = Previews::get();
  55         PreviewLoader & loader = previews.loader(view()->buffer());
  56         addPreview(loader);
  57         if (!snippet_.empty())
  58                 loader.startLoading();
  59 }
  60
  61
  62 void PreviewedInset::addPreview(PreviewLoader & ploader)
  63 {
  64         if (!Previews::activated() || !previewWanted())
  65                 return;
  66
  67         snippet_ = trim(latexString());
  68         if (snippet_.empty())
  69                 return;
  70
  71         pimage_ = ploader.preview(snippet_);
  72         if (pimage_)
  73                 return;
  74
  75         // If this is the first time of calling, connect to the
  76         // PreviewLoader signal that'll inform us when the preview image
  77         // is ready for loading.
  78         if (!connection_.connected()) {
  79                 connection_ = ploader.connect(
  80                         boost::bind(&PreviewedInset::imageReady, this, _1));
  81         }
  82
  83         ploader.add(snippet_);
  84 }
  85
  86
  87 void PreviewedInset::removePreview()
  88 {
  89         if (!view() || !view()->buffer() || snippet_.empty())
  90                 return;
  91
  92         Previews & previews = Previews::get();
  93         PreviewLoader & loader = previews.loader(view()->buffer());
  94         loader.remove(snippet_);
  95         snippet_.erase();
  96         pimage_ = 0;
  97 }
  98
  99
 100 bool PreviewedInset::previewReady() const
 101 {
 102         if (!Previews::activated() || !previewWanted() ||
 103             !view() || !view()->buffer())
 104                 return false;
 105
 106         if (!pimage_ || snippet_ != pimage_->snippet()) {
 107                 PreviewLoader & ploader =
 108                         Previews::get().loader(view()->buffer());
 109                 pimage_ = ploader.preview(snippet_);
 110         }
 111
 112         if (!pimage_)
 113                 return false;
 114
 115         return pimage_->image();
 116 }
 117
 118
 119 void PreviewedInset::imageReady(PreviewImage const & pimage) const
 120 {
 121         // Check snippet against the Inset's current contents
 122         if (snippet_ != pimage.snippet())
 123                 return;
 124
 125         pimage_ = &pimage;
 126
 127         if (view())
 128                 view()->updateInset();
 129 }
 130
 131 } // namespace graphics
 132 } // namespace lyx