src/graphics/PreviewedInset.C

   1 // -*- C++ -*-
   2 /**
   3  *  \file PreviewedInset.C
   4  *  Copyright 2002 the LyX Team
   5  *  Read the file COPYING
   6  *
   7  * \author Angus Leeming <leeming@lyx.org>
   8  */
   9
  10 #ifdef __GNUG__
  11 #pragma implementation
  12 #endif
  13
  14 #include <config.h>
  15
  16 #include "PreviewedInset.h"
  17 #include "GraphicsImage.h"
  18 #include "PreviewLoader.h"
  19 #include "PreviewImage.h"
  20 #include "Previews.h"
  21
  22 #include "buffer.h"
  23 #include "BufferView.h"
  24
  25 #include "frontends/LyXView.h"
  26
  27 #include "support/lstrings.h"
  28
  29 #include <boost/bind.hpp>
  30
  31
  32 namespace grfx {
  33
  34 bool PreviewedInset::activated()
  35 {
  36         return Previews::activated();
  37 }
  38
  39
  40 void PreviewedInset::generatePreview()
  41 {
  42         if (!Previews::activated() || !previewWanted() ||
  43             !view() || !view()->buffer())
  44                 return;
  45
  46         grfx::Previews & previews = grfx::Previews::get();
  47         grfx::PreviewLoader & loader = previews.loader(view()->buffer());
  48         addPreview(loader);
  49         if (!snippet_.empty())
  50                 loader.startLoading();
  51 }
  52
  53
  54 void PreviewedInset::addPreview(grfx::PreviewLoader & ploader)
  55 {
  56         if (!Previews::activated() || !previewWanted())
  57                 return;
  58
  59         setView(ploader.buffer().getUser());
  60
  61         snippet_ = trim(latexString());
  62         if (snippet_.empty())
  63                 return;
  64
  65         pimage_ = ploader.preview(snippet_);
  66         if (pimage_)
  67                 return;
  68
  69         // If this is the first time of calling, connect to the
  70         // grfx::PreviewLoader signal that'll inform us when the preview image
  71         // is ready for loading.
  72         if (!connection_.connected()) {
  73                 connection_ = ploader.connect(
  74                         boost::bind(&PreviewedInset::imageReady, this, _1));
  75         }
  76
  77         ploader.add(snippet_);
  78 }
  79
  80
  81 bool PreviewedInset::previewReady() const
  82 {
  83         if (!Previews::activated() || !previewWanted() ||
  84             !view() || !view()->buffer())
  85                 return false;
  86
  87         if (!pimage_ || snippet_ != pimage_->snippet()) {
  88                 grfx::PreviewLoader & ploader =
  89                         grfx::Previews::get().loader(view()->buffer());
  90                 pimage_ = ploader.preview(snippet_);
  91         }
  92
  93         if (!pimage_)
  94                 return false;
  95
  96         return pimage_->image(inset_, *view());
  97 }
  98
  99
 100 void PreviewedInset::setView(BufferView * bv)
 101 {
 102         if (!bv)
 103                 return;
 104
 105         view_ = bv->owner()->view();
 106 }
 107
 108 void PreviewedInset::imageReady(grfx::PreviewImage const & pimage) const
 109 {
 110         // Check snippet against the Inset's current contents
 111         if (snippet_ != pimage.snippet())
 112                 return;
 113
 114         pimage_ = &pimage;
 115
 116         if (view())
 117                 view()->updateInset(&inset_, false);
 118 }
 119
 120 } // namespace grfx