src/graphics/PreviewedInset.C

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