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