src/insets/InsetPreview.cpp

   1 /**
   2  * \file InsetPreview.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Vincent van Ravesteijn
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10 #include "config.h"
  11
  12 #include "InsetPreview.h"
  13
  14 #include "Buffer.h"
  15 #include "BufferParams.h"
  16 #include "BufferView.h"
  17 #include "Cursor.h"
  18 #include "Lexer.h"
  19 #include "MetricsInfo.h"
  20 #include "OutputParams.h"
  21 #include "RenderPreview.h"
  22
  23 #include "frontends/Painter.h"
  24
  25 #include "graphics/PreviewImage.h"
  26
  27 #include <sstream>
  28
  29 using namespace std;
  30
  31 namespace lyx {
  32
  33
  34 InsetPreview::InsetPreview(Buffer * buf)
  35         : InsetText(buf),
  36           preview_(new RenderPreview(this)), use_preview_(true)
  37 {
  38         setAutoBreakRows(true);
  39         setDrawFrame(true);
  40         setFrameColor(Color_previewframe);
  41 }
  42
  43
  44 InsetPreview::~InsetPreview()
  45 {}
  46
  47
  48 InsetPreview::InsetPreview(InsetPreview const & other)
  49         : InsetText(other)
  50 {
  51         preview_.reset(new RenderPreview(*other.preview_, this));
  52 }
  53
  54
  55 void InsetPreview::write(ostream & os) const
  56 {
  57         os << "Preview" << "\n";
  58         text().write(os);
  59 }
  60
  61
  62 void InsetPreview::addPreview(DocIterator const & inset_pos,
  63         graphics::PreviewLoader &) const
  64 {
  65         preparePreview(inset_pos);
  66 }
  67
  68
  69 void InsetPreview::preparePreview(DocIterator const & pos) const
  70 {
  71         TexRow texrow;
  72         odocstringstream str;
  73         otexstream os(str, texrow);
  74         OutputParams runparams(&pos.buffer()->params().encoding());
  75         latex(os, runparams);
  76         docstring const snippet = str.str();
  77         preview_->addPreview(snippet, *pos.buffer());
  78 }
  79
  80
  81 bool InsetPreview::previewState(BufferView * bv) const
  82 {
  83         if (!editing(bv) && RenderPreview::previewText()) {
  84                 graphics::PreviewImage const * pimage =
  85                         preview_->getPreviewImage(bv->buffer());
  86                 return pimage && pimage->image();
  87         }
  88         return false;
  89 }
  90
  91
  92 void InsetPreview::reloadPreview(DocIterator const & pos) const
  93 {
  94         preparePreview(pos);
  95         preview_->startLoading(*pos.buffer());
  96 }
  97
  98
  99 void InsetPreview::draw(PainterInfo & pi, int x, int y) const
 100 {
 101         use_preview_ = previewState(pi.base.bv);
 102
 103         if (use_preview_) {
 104                 // one pixel gap in front
 105                 preview_->draw(pi, x + 1 + TEXT_TO_INSET_OFFSET, y);
 106                 setPosCache(pi, x, y);
 107                 return;
 108         }
 109         InsetText::draw(pi, x, y);
 110 }
 111
 112
 113 void InsetPreview::edit(Cursor & cur, bool front, EntryDirection entry_from)
 114 {
 115         cur.push(*this);
 116         InsetText::edit(cur, front, entry_from);
 117 }
 118
 119
 120 Inset * InsetPreview::editXY(Cursor & cur, int x, int y)
 121 {
 122         if (use_preview_) {
 123                 edit(cur, true, ENTRY_DIRECTION_IGNORE);
 124                 return this;
 125         }
 126         cur.push(*this);
 127         return InsetText::editXY(cur, x, y);
 128 }
 129
 130
 131 void InsetPreview::metrics(MetricsInfo & mi, Dimension & dim) const
 132 {
 133         if (previewState(mi.base.bv)) {
 134                 preview_->metrics(mi, dim);
 135                 mi.base.textwidth += 2 * TEXT_TO_INSET_OFFSET;
 136
 137                 dim.wid = max(dim.wid, 4);
 138                 dim.asc = max(dim.asc, 4);
 139
 140                 dim.asc += TEXT_TO_INSET_OFFSET;
 141                 dim.des += TEXT_TO_INSET_OFFSET;
 142                 dim.wid += TEXT_TO_INSET_OFFSET;
 143                 dim_ = dim;
 144                 dim.wid += TEXT_TO_INSET_OFFSET;
 145                 // insert a one pixel gap
 146                 dim.wid += 1;
 147                 // Cache the inset dimension.
 148                 setDimCache(mi, dim);
 149                 Dimension dim_dummy;
 150                 MetricsInfo mi_dummy = mi;
 151                 InsetText::metrics(mi_dummy, dim_dummy);
 152                 return;
 153         }
 154         InsetText::metrics(mi, dim);
 155 }
 156
 157
 158 bool InsetPreview::notifyCursorLeaves(Cursor const & old, Cursor & cur)
 159 {
 160         reloadPreview(old);
 161         cur.screenUpdateFlags(Update::Force);
 162         return InsetText::notifyCursorLeaves(old, cur);
 163 }
 164
 165
 166 } // namespace lyx