lyx_mirror/src/TextMetrics.cpp

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/**
* \file src/TextMetrics.cpp
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Asger Alstrup
* \author Lars Gullik Bj<EFBFBD>nnes
* \author Jean-Marc Lasgouttes
* \author John Levon
* \author Andr<EFBFBD> P<EFBFBD>nitz
* \author Dekel Tsur
* \author J<EFBFBD>rgen Vigna
* \author Abdelrazak Younes
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "TextMetrics.h"
#include "Buffer.h"
#include "BufferParams.h"
#include "BufferView.h"
#include "paragraph_funcs.h"
#include "ParIterator.h"
#include "CoordCache.h"
#include "debug.h"
#include "FuncRequest.h"
#include "FontIterator.h"
#include "Color.h"
#include "Length.h"
#include "LyXRC.h"
#include "Text.h"
#include "MetricsInfo.h"
#include "ParagraphParameters.h"
#include "VSpace.h"
#include "frontends/FontMetrics.h"
#include "frontends/Painter.h"
using std::max;
using std::min;
using std::endl;
namespace lyx {
using frontend::FontMetrics;
namespace {
int numberOfSeparators(Paragraph const & par, Row const & row)
{
pos_type const first = max(row.pos(), par.beginOfBody());
pos_type const last = row.endpos() - 1;
int n = 0;
for (pos_type p = first; p < last; ++p) {
if (par.isSeparator(p))
++n;
}
return n;
}
int numberOfLabelHfills(Paragraph const & par, Row const & row)
{
pos_type last = row.endpos() - 1;
pos_type first = row.pos();
// hfill *DO* count at the beginning of paragraphs!
if (first) {
while (first < last && par.isHfill(first))
++first;
}
last = min(last, par.beginOfBody());
int n = 0;
for (pos_type p = first; p < last; ++p) {
if (par.isHfill(p))
++n;
}
return n;
}
int numberOfHfills(Paragraph const & par, Row const & row)
{
pos_type const last = row.endpos();
pos_type first = row.pos();
// hfill *DO* count at the beginning of paragraphs!
if (first) {
while (first < last && par.isHfill(first))
++first;
}
first = max(first, par.beginOfBody());
int n = 0;
for (pos_type p = first; p < last; ++p) {
if (par.isHfill(p))
++n;
}
return n;
}
} // namespace anon
TextMetrics::TextMetrics(BufferView * bv, Text * text)
: bv_(bv), text_(text)
{
BOOST_ASSERT(bv_);
max_width_ = bv_->workWidth();
dim_.wid = max_width_;
dim_.asc = 10;
dim_.des = 10;
//text_->updateLabels(*bv->buffer());
}
ParagraphMetrics const & TextMetrics::parMetrics(pit_type pit) const
{
return const_cast<TextMetrics *>(this)->parMetrics(pit, true);
}
ParagraphMetrics & TextMetrics::parMetrics(pit_type pit,
bool redo)
{
ParMetricsCache::iterator pmc_it = par_metrics_.find(pit);
if (pmc_it == par_metrics_.end()) {
pmc_it = par_metrics_.insert(
std::make_pair(pit, ParagraphMetrics(text_->getPar(pit)))).first;
}
if (pmc_it->second.rows().empty() && redo) {
redoParagraph(pit);
}
return pmc_it->second;
}
bool TextMetrics::metrics(MetricsInfo & mi, Dimension & dim)
{
BOOST_ASSERT(mi.base.textwidth);
max_width_ = mi.base.textwidth;
//lyxerr << "Text::metrics: width: " << mi.base.textwidth
// << " maxWidth: " << max_width_ << "\nfont: " << mi.base.font << endl;
bool changed = false;
unsigned int h = 0;
unsigned int w = 0;
for (pit_type pit = 0, n = text_->paragraphs().size(); pit != n; ++pit) {
changed |= redoParagraph(pit);
ParagraphMetrics const & pm = parMetrics(pit);
h += pm.height();
if (w < pm.width())
w = pm.width();
}
dim.wid = w;
dim.asc = parMetrics(0).ascent();
dim.des = h - dim.asc;
changed |= dim_ != dim;
dim_ = dim;
return changed;
}
int TextMetrics::rightMargin(ParagraphMetrics const & pm) const
{
return main_text_? pm.rightMargin(*bv_->buffer()) : 0;
}
int TextMetrics::rightMargin(pit_type const pit) const
{
return main_text_? par_metrics_[pit].rightMargin(*bv_->buffer()) : 0;
}
bool TextMetrics::redoParagraph(pit_type const pit)
{
Paragraph & par = text_->getPar(pit);
ParagraphMetrics pm(par);
Buffer & buffer = *bv_->buffer();
main_text_ = (text_ == &buffer.text());
bool changed = false;
// FIXME This check ought to be done somewhere else. It is the reason
// why text_ is not const. But then, where else to do it?
// Well, how can you end up with either (a) a biblio environment that
// has no InsetBibitem or (b) a biblio environment with more than one
// InsetBibitem? I think the answer is: when paragraphs are merged;
// when layout is set; when material is pasted.
int const moveCursor = par.checkBiblio(buffer.params().trackChanges);
if (moveCursor > 0)
const_cast<Cursor &>(bv_->cursor()).posRight();
else if (moveCursor < 0) {
Cursor & cursor = const_cast<Cursor &>(bv_->cursor());
if (cursor.pos() >= -moveCursor)
cursor.posLeft();
}
// Optimisation: this is used in the next two loops
// so better to calculate that once here.
int const right_margin = rightMargin(pm);
// redo insets
// FIXME: We should always use getFont(), see documentation of
// noFontChange() in Inset.h.
Font const bufferfont = buffer.params().getFont();
InsetList::const_iterator ii = par.insetlist.begin();
InsetList::const_iterator iend = par.insetlist.end();
for (; ii != iend; ++ii) {
Dimension dim;
int const w = max_width_ - text_->leftMargin(buffer, max_width_, pit, ii->pos)
- right_margin;
Font const & font = ii->inset->noFontChange() ?
bufferfont : text_->getFont(buffer, par, ii->pos);
MetricsInfo mi(bv_, font, w);
changed |= ii->inset->metrics(mi, dim);
}
// rebreak the paragraph
pm.rows().clear();
par.setBeginOfBody();
pos_type z = 0;
// maximum pixel width of a row
int width = max_width_ - right_margin; // - leftMargin(buffer, max_width_, pit, row);
do {
Row row(z);
rowBreakPoint(width, pit, row);
setRowWidth(right_margin, pit, row);
setHeightOfRow(pit, row);
pm.rows().push_back(row);
pm.dim().wid = std::max(pm.dim().wid, row.width());
pm.dim().des += row.height();
z = row.endpos();
} while (z < par.size());
// Make sure that if a par ends in newline, there is one more row
// under it
if (z > 0 && par.isNewline(z - 1)) {
Row row(z);
row.endpos(z);
setRowWidth(right_margin, pit, row);
setHeightOfRow(pit, row);
pm.rows().push_back(row);
pm.dim().des += row.height();
}
pm.dim().asc += pm.rows()[0].ascent();
pm.dim().des -= pm.rows()[0].ascent();
// IMPORTANT NOTE: We pass 'false' explicitely in order to not call
// redoParagraph() recursively inside parMetrics.
Dimension old_dim = parMetrics(pit, false).dim();
changed |= old_dim.height() != pm.dim().height();
par_metrics_[pit] = pm;
// Update the row change statuses. The painter will need that info
// in order to know which row has to be repainted.
par_metrics_[pit].updateRowChangeStatus();
return changed;
}
RowMetrics TextMetrics::computeRowMetrics(pit_type const pit,
Row const & row) const
{
RowMetrics result;
Buffer & buffer = *bv_->buffer();
Paragraph const & par = text_->getPar(pit);
double w = dim_.wid - row.width();
bool const is_rtl = text_->isRTL(buffer, par);
if (is_rtl)
result.x = rightMargin(pit);
else
result.x = text_->leftMargin(buffer, max_width_, pit, row.pos());
// is there a manual margin with a manual label
Layout_ptr const & layout = par.layout();
if (layout->margintype == MARGIN_MANUAL
&& layout->labeltype == LABEL_MANUAL) {
/// We might have real hfills in the label part
int nlh = numberOfLabelHfills(par, row);
// A manual label par (e.g. List) has an auto-hfill
// between the label text and the body of the
// paragraph too.
// But we don't want to do this auto hfill if the par
// is empty.
if (!par.empty())
++nlh;
if (nlh && !par.getLabelWidthString().empty())
result.label_hfill = labelFill(par, row) / double(nlh);
}
// are there any hfills in the row?
int const nh = numberOfHfills(par, row);
if (nh) {
if (w > 0)
result.hfill = w / nh;
// we don't have to look at the alignment if it is ALIGN_LEFT and
// if the row is already larger then the permitted width as then
// we force the LEFT_ALIGN'edness!
} else if (int(row.width()) < max_width_) {
// is it block, flushleft or flushright?
// set x how you need it
int align;
if (par.params().align() == LYX_ALIGN_LAYOUT)
align = layout->align;
else
align = par.params().align();
// Display-style insets should always be on a centred row
// The test on par.size() is to catch zero-size pars, which
// would trigger the assert in Paragraph::getInset().
//inset = par.size() ? par.getInset(row.pos()) : 0;
if (row.pos() < par.size()
&& par.isInset(row.pos()))
{
switch(par.getInset(row.pos())->display()) {
case Inset::AlignLeft:
align = LYX_ALIGN_BLOCK;
break;
case Inset::AlignCenter:
align = LYX_ALIGN_CENTER;
break;
// other types unchanged (use align)
}
}
switch (align) {
case LYX_ALIGN_BLOCK: {
int const ns = numberOfSeparators(par, row);
bool disp_inset = false;
if (row.endpos() < par.size()) {
Inset const * in = par.getInset(row.endpos());
if (in)
disp_inset = in->display();
}
// If we have separators, this is not the last row of a
// par, does not end in newline, and is not row above a
// display inset... then stretch it
if (ns
&& row.endpos() < par.size()
&& !par.isNewline(row.endpos() - 1)
&& !disp_inset
) {
result.separator = w / ns;
} else if (is_rtl) {
result.x += w;
}
break;
}
case LYX_ALIGN_RIGHT:
result.x += w;
break;
case LYX_ALIGN_CENTER:
result.x += w / 2;
break;
}
}
if (is_rtl) {
pos_type body_pos = par.beginOfBody();
pos_type end = row.endpos();
if (body_pos > 0
&& (body_pos > end || !par.isLineSeparator(body_pos - 1)))
{
docstring const lsep = from_utf8(layout->labelsep);
result.x += theFontMetrics(text_->getLabelFont(buffer, par)).width(lsep);
if (body_pos <= end)
result.x += result.label_hfill;
}
}
return result;
}
int TextMetrics::labelFill(Paragraph const & par, Row const & row) const
{
Buffer & buffer = *bv_->buffer();
pos_type last = par.beginOfBody();
BOOST_ASSERT(last > 0);
// -1 because a label ends with a space that is in the label
--last;
// a separator at this end does not count
if (par.isLineSeparator(last))
--last;
int w = 0;
for (pos_type i = row.pos(); i <= last; ++i)
w += text_->singleWidth(buffer, par, i);
docstring const & label = par.params().labelWidthString();
if (label.empty())
return 0;
FontMetrics const & fm
= theFontMetrics(text_->getLabelFont(buffer, par));
return max(0, fm.width(label) - w);
}
namespace {
// this needs special handling - only newlines count as a break point
pos_type addressBreakPoint(pos_type i, Paragraph const & par)
{
pos_type const end = par.size();
for (; i < end; ++i)
if (par.isNewline(i))
return i + 1;
return end;
}
};
int TextMetrics::labelEnd(pit_type const pit) const
{
// labelEnd is only needed if the layout fills a flushleft label.
if (text_->getPar(pit).layout()->margintype != MARGIN_MANUAL)
return 0;
// return the beginning of the body
return text_->leftMargin(*bv_->buffer(), max_width_, pit);
}
void TextMetrics::rowBreakPoint(int width, pit_type const pit,
Row & row) const
{
Buffer & buffer = *bv_->buffer();
Paragraph const & par = text_->getPar(pit);
pos_type const end = par.size();
pos_type const pos = row.pos();
if (pos == end) {
row.endpos(end);
return;
}
if (width < 0) {
row.endpos(end);
return;
}
Layout_ptr const & layout = par.layout();
if (layout->margintype == MARGIN_RIGHT_ADDRESS_BOX) {
row.endpos(addressBreakPoint(pos, par));
return;
}
pos_type const body_pos = par.beginOfBody();
// Now we iterate through until we reach the right margin
// or the end of the par, then choose the possible break
// nearest that.
int label_end = labelEnd(pit);
int const left = text_->leftMargin(buffer, max_width_, pit, pos);
int x = left;
// pixel width since last breakpoint
int chunkwidth = 0;
FontIterator fi = FontIterator(buffer, *text_, par, pos);
pos_type point = end;
pos_type i = pos;
FontMetrics const & fm = theFontMetrics(text_->getLabelFont(buffer, par));
for ( ; i < end; ++i, ++fi) {
char_type const c = par.getChar(i);
int thiswidth = text_->singleWidth(par, i, c, *fi);
// add the auto-hfill from label end to the body
if (body_pos && i == body_pos) {
docstring lsep = from_utf8(layout->labelsep);
int add = fm.width(lsep);
if (par.isLineSeparator(i - 1))
add -= text_->singleWidth(buffer, par, i - 1);
add = std::max(add, label_end - x);
thiswidth += add;
}
x += thiswidth;
chunkwidth += thiswidth;
// break before a character that will fall off
// the right of the row
if (x >= width) {
// if no break before, break here
if (point == end || chunkwidth >= width - left) {
if (i > pos)
point = i;
else
point = i + 1;
}
// exit on last registered breakpoint:
break;
}
if (par.isNewline(i)) {
point = i + 1;
break;
}
// Break before...
if (i + 1 < end) {
if (par.isInset(i + 1) && par.getInset(i + 1)->display()) {
point = i + 1;
break;
}
// ...and after.
if (par.isInset(i) && par.getInset(i)->display()) {
point = i + 1;
break;
}
}
if (!par.isInset(i) || par.getInset(i)->isChar()) {
// some insets are line separators too
if (par.isLineSeparator(i)) {
// register breakpoint:
point = i + 1;
chunkwidth = 0;
}
}
}
// maybe found one, but the par is short enough.
if (i == end && x < width)
point = end;
// manual labels cannot be broken in LaTeX. But we
// want to make our on-screen rendering of footnotes
// etc. still break
if (body_pos && point < body_pos)
point = body_pos;
row.endpos(point);
}
void TextMetrics::setRowWidth(int right_margin,
pit_type const pit, Row & row) const
{
Buffer & buffer = *bv_->buffer();
// get the pure distance
pos_type const end = row.endpos();
Paragraph const & par = text_->getPar(pit);
docstring const labelsep = from_utf8(par.layout()->labelsep);
int w = text_->leftMargin(buffer, max_width_, pit, row.pos());
int label_end = labelEnd(pit);
pos_type const body_pos = par.beginOfBody();
pos_type i = row.pos();
FontMetrics const & fm = theFontMetrics(text_->getLabelFont(buffer, par));
if (i < end) {
FontIterator fi = FontIterator(buffer, *text_, par, i);
for ( ; i < end; ++i, ++fi) {
if (body_pos > 0 && i == body_pos) {
w += fm.width(labelsep);
if (par.isLineSeparator(i - 1))
w -= text_->singleWidth(buffer, par, i - 1);
w = max(w, label_end);
}
char_type const c = par.getChar(i);
w += text_->singleWidth(par, i, c, *fi);
}
}
if (body_pos > 0 && body_pos >= end) {
w += fm.width(labelsep);
if (end > 0 && par.isLineSeparator(end - 1))
w -= text_->singleWidth(buffer, par, end - 1);
w = max(w, label_end);
}
row.width(w + right_margin);
}
void TextMetrics::setHeightOfRow(pit_type const pit,
Row & row)
{
Paragraph const & par = text_->getPar(pit);
// get the maximum ascent and the maximum descent
double layoutasc = 0;
double layoutdesc = 0;
double const dh = defaultRowHeight();
// ok, let us initialize the maxasc and maxdesc value.
// Only the fontsize count. The other properties
// are taken from the layoutfont. Nicer on the screen :)
Layout_ptr const & layout = par.layout();
// as max get the first character of this row then it can
// increase but not decrease the height. Just some point to
// start with so we don't have to do the assignment below too
// often.
Buffer const & buffer = *bv_->buffer();
Font font = text_->getFont(buffer, par, row.pos());
Font::FONT_SIZE const tmpsize = font.size();
font = text_->getLayoutFont(buffer, pit);
Font::FONT_SIZE const size = font.size();
font.setSize(tmpsize);
Font labelfont = text_->getLabelFont(buffer, par);
FontMetrics const & labelfont_metrics = theFontMetrics(labelfont);
FontMetrics const & fontmetrics = theFontMetrics(font);
// these are minimum values
double const spacing_val = layout->spacing.getValue()
* text_->spacing(buffer, par);
//lyxerr << "spacing_val = " << spacing_val << endl;
int maxasc = int(fontmetrics.maxAscent() * spacing_val);
int maxdesc = int(fontmetrics.maxDescent() * spacing_val);
// insets may be taller
InsetList::const_iterator ii = par.insetlist.begin();
InsetList::const_iterator iend = par.insetlist.end();
for ( ; ii != iend; ++ii) {
if (ii->pos >= row.pos() && ii->pos < row.endpos()) {
maxasc = max(maxasc, ii->inset->ascent());
maxdesc = max(maxdesc, ii->inset->descent());
}
}
// Check if any custom fonts are larger (Asger)
// This is not completely correct, but we can live with the small,
// cosmetic error for now.
int labeladdon = 0;
pos_type const pos_end = row.endpos();
Font::FONT_SIZE maxsize =
par.highestFontInRange(row.pos(), pos_end, size);
if (maxsize > font.size()) {
// use standard paragraph font with the maximal size
Font maxfont = font;
maxfont.setSize(maxsize);
FontMetrics const & maxfontmetrics = theFontMetrics(maxfont);
maxasc = max(maxasc, maxfontmetrics.maxAscent());
maxdesc = max(maxdesc, maxfontmetrics.maxDescent());
}
// This is nicer with box insets:
++maxasc;
++maxdesc;
row.ascent(maxasc);
ParagraphList const & pars = text_->paragraphs();
// is it a top line?
if (row.pos() == 0) {
BufferParams const & bufparams = buffer.params();
// some parskips VERY EASY IMPLEMENTATION
if (bufparams.paragraph_separation
== BufferParams::PARSEP_SKIP
&& par.ownerCode() != Inset::ERT_CODE
&& par.ownerCode() != Inset::LISTINGS_CODE
&& pit > 0
&& ((layout->isParagraph() && par.getDepth() == 0)
|| (pars[pit - 1].layout()->isParagraph()
&& pars[pit - 1].getDepth() == 0)))
{
maxasc += bufparams.getDefSkip().inPixels(*bv_);
}
if (par.params().startOfAppendix())
maxasc += int(3 * dh);
// This is special code for the chapter, since the label of this
// layout is printed in an extra row
if (layout->counter == "chapter"
&& !par.params().labelString().empty()) {
labeladdon = int(labelfont_metrics.maxHeight()
* layout->spacing.getValue()
* text_->spacing(buffer, par));
}
// special code for the top label
if ((layout->labeltype == LABEL_TOP_ENVIRONMENT
|| layout->labeltype == LABEL_BIBLIO
|| layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)
&& isFirstInSequence(pit, pars)
&& !par.getLabelstring().empty())
{
labeladdon = int(
labelfont_metrics.maxHeight()
* layout->spacing.getValue()
* text_->spacing(buffer, par)
+ (layout->topsep + layout->labelbottomsep) * dh);
}
// Add the layout spaces, for example before and after
// a section, or between the items of a itemize or enumerate
// environment.
pit_type prev = depthHook(pit, pars, par.getDepth());
Paragraph const & prevpar = pars[prev];
if (prev != pit
&& prevpar.layout() == layout
&& prevpar.getDepth() == par.getDepth()
&& prevpar.getLabelWidthString()
== par.getLabelWidthString()) {
layoutasc = layout->itemsep * dh;
} else if (pit != 0 || row.pos() != 0) {
if (layout->topsep > 0)
layoutasc = layout->topsep * dh;
}
prev = outerHook(pit, pars);
if (prev != pit_type(pars.size())) {
maxasc += int(pars[prev].layout()->parsep * dh);
} else if (pit != 0) {
Paragraph const & prevpar = pars[pit - 1];
if (prevpar.getDepth() != 0 ||
prevpar.layout() == layout) {
maxasc += int(layout->parsep * dh);
}
}
}
// is it a bottom line?
if (row.endpos() >= par.size()) {
// add the layout spaces, for example before and after
// a section, or between the items of a itemize or enumerate
// environment
pit_type nextpit = pit + 1;
if (nextpit != pit_type(pars.size())) {
pit_type cpit = pit;
double usual = 0;
double unusual = 0;
if (pars[cpit].getDepth() > pars[nextpit].getDepth()) {
usual = pars[cpit].layout()->bottomsep * dh;
cpit = depthHook(cpit, pars, pars[nextpit].getDepth());
if (pars[cpit].layout() != pars[nextpit].layout()
|| pars[nextpit].getLabelWidthString() != pars[cpit].getLabelWidthString())
{
unusual = pars[cpit].layout()->bottomsep * dh;
}
layoutdesc = max(unusual, usual);
} else if (pars[cpit].getDepth() == pars[nextpit].getDepth()) {
if (pars[cpit].layout() != pars[nextpit].layout()
|| pars[nextpit].getLabelWidthString() != pars[cpit].getLabelWidthString())
layoutdesc = int(pars[cpit].layout()->bottomsep * dh);
}
}
}
// incalculate the layout spaces
maxasc += int(layoutasc * 2 / (2 + pars[pit].getDepth()));
maxdesc += int(layoutdesc * 2 / (2 + pars[pit].getDepth()));
// FIXME: the correct way is to do the following is to move the
// following code in another method specially tailored for the
// main Text. The following test is thus bogus.
// Top and bottom margin of the document (only at top-level)
if (main_text_) {
if (pit == 0 && row.pos() == 0)
maxasc += 20;
if (pit + 1 == pit_type(pars.size()) &&
row.endpos() == par.size() &&
!(row.endpos() > 0 && par.isNewline(row.endpos() - 1)))
maxdesc += 20;
}
row.ascent(maxasc + labeladdon);
row.descent(maxdesc);
}
// x is an absolute screen coord
// returns the column near the specified x-coordinate of the row
// x is set to the real beginning of this column
pos_type TextMetrics::getColumnNearX(pit_type const pit,
Row const & row, int & x, bool & boundary) const
{
Buffer const & buffer = *bv_->buffer();
/// For the main Text, it is possible that this pit is not
/// yet in the CoordCache when moving cursor up.
/// x Paragraph coordinate is always 0 for main text anyway.
int const xo = main_text_? 0 : bv_->coordCache().get(text_, pit).x_;
x -= xo;
RowMetrics const r = computeRowMetrics(pit, row);
Paragraph const & par = text_->getPar(pit);
Bidi bidi;
bidi.computeTables(par, buffer, row);
pos_type vc = row.pos();
pos_type end = row.endpos();
pos_type c = 0;
Layout_ptr const & layout = par.layout();
bool left_side = false;
pos_type body_pos = par.beginOfBody();
double tmpx = r.x;
double last_tmpx = tmpx;
if (body_pos > 0 &&
(body_pos > end || !par.isLineSeparator(body_pos - 1)))
body_pos = 0;
// check for empty row
if (vc == end) {
x = int(tmpx) + xo;
return 0;
}
frontend::FontMetrics const & fm
= theFontMetrics(text_->getLabelFont(buffer, par));
while (vc < end && tmpx <= x) {
c = bidi.vis2log(vc);
last_tmpx = tmpx;
if (body_pos > 0 && c == body_pos - 1) {
// FIXME UNICODE
docstring const lsep = from_utf8(layout->labelsep);
tmpx += r.label_hfill + fm.width(lsep);
if (par.isLineSeparator(body_pos - 1))
tmpx -= text_->singleWidth(buffer, par, body_pos - 1);
}
if (par.hfillExpansion(row, c)) {
tmpx += text_->singleWidth(buffer, par, c);
if (c >= body_pos)
tmpx += r.hfill;
else
tmpx += r.label_hfill;
} else if (par.isSeparator(c)) {
tmpx += text_->singleWidth(buffer, par, c);
if (c >= body_pos)
tmpx += r.separator;
} else {
tmpx += text_->singleWidth(buffer, par, c);
}
++vc;
}
if ((tmpx + last_tmpx) / 2 > x) {
tmpx = last_tmpx;
left_side = true;
}
BOOST_ASSERT(vc <= end); // This shouldn't happen.
boundary = false;
// This (rtl_support test) is not needed, but gives
// some speedup if rtl_support == false
bool const lastrow = lyxrc.rtl_support && row.endpos() == par.size();
// If lastrow is false, we don't need to compute
// the value of rtl.
bool const rtl = lastrow ? text_->isRTL(buffer, par) : false;
if (lastrow &&
((rtl && left_side && vc == row.pos() && x < tmpx - 5) ||
(!rtl && !left_side && vc == end && x > tmpx + 5)))
c = end;
else if (vc == row.pos()) {
c = bidi.vis2log(vc);
if (bidi.level(c) % 2 == 1)
++c;
} else {
c = bidi.vis2log(vc - 1);
bool const rtl = (bidi.level(c) % 2 == 1);
if (left_side == rtl) {
++c;
boundary = text_->isRTLBoundary(buffer, par, c);
}
}
// I believe this code is not needed anymore (Jug 20050717)
#if 0
// The following code is necessary because the cursor position past
// the last char in a row is logically equivalent to that before
// the first char in the next row. That's why insets causing row
// divisions -- Newline and display-style insets -- must be treated
// specially, so cursor up/down doesn't get stuck in an air gap -- MV
// Newline inset, air gap below:
if (row.pos() < end && c >= end && par.isNewline(end - 1)) {
if (bidi.level(end -1) % 2 == 0)
tmpx -= text_->singleWidth(buffer, par, end - 1);
else
tmpx += text_->singleWidth(buffer, par, end - 1);
c = end - 1;
}
// Air gap above display inset:
if (row.pos() < end && c >= end && end < par.size()
&& par.isInset(end) && par.getInset(end)->display()) {
c = end - 1;
}
// Air gap below display inset:
if (row.pos() < end && c >= end && par.isInset(end - 1)
&& par.getInset(end - 1)->display()) {
c = end - 1;
}
#endif
x = int(tmpx) + xo;
pos_type const col = c - row.pos();
if (!c || end == par.size())
return col;
if (c==end && !par.isLineSeparator(c-1) && !par.isNewline(c-1)) {
boundary = true;
return col;
}
return min(col, end - 1 - row.pos());
}
pos_type TextMetrics::x2pos(pit_type pit, int row, int x) const
{
ParagraphMetrics const & pm = parMetrics(pit);
BOOST_ASSERT(!pm.rows().empty());
BOOST_ASSERT(row < int(pm.rows().size()));
bool bound = false;
Row const & r = pm.rows()[row];
return r.pos() + getColumnNearX(pit, r, x, bound);
}
//int Text::pos2x(pit_type pit, pos_type pos) const
//{
// ParagraphMetrics const & pm = parMetrics(pit);
// Row const & r = pm.rows()[row];
// int x = 0;
// pos -= r.pos();
//}
int defaultRowHeight()
{
return int(theFontMetrics(Font(Font::ALL_SANE)).maxHeight() * 1.2);
}
} // namespace lyx