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lyx_mirror/src/TextMetrics.cpp
Yuriy Skalko 6a7c9d12f9 Amend d3c335a5d5
2021-10-05 17:10:51 +03:00

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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 Bjønnes
* \author Jean-Marc Lasgouttes
* \author John Levon
* \author André Pönitz
* \author Dekel Tsur
* \author Jürgen 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 "CoordCache.h"
#include "Cursor.h"
#include "CutAndPaste.h"
#include "Layout.h"
#include "LyXRC.h"
#include "MetricsInfo.h"
#include "ParagraphParameters.h"
#include "RowPainter.h"
#include "Session.h"
#include "Text.h"
#include "TextClass.h"
#include "VSpace.h"
#include "insets/InsetText.h"
#include "mathed/MacroTable.h"
#include "frontends/FontMetrics.h"
#include "frontends/NullPainter.h"
#include "support/debug.h"
#include "support/lassert.h"
#include "support/Changer.h"
#include <stdlib.h>
#include <cmath>
using namespace std;
namespace lyx {
using frontend::FontMetrics;
namespace {
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;
}
// FIXME: this needs to be rewritten, probably by merging it into some
// code that, besides counting, sets the active status of the space
// inset in the row element.
int numberOfHfills(Row const & row, ParagraphMetrics const & pm,
pos_type const body_pos)
{
int n = 0;
Row::const_iterator cit = row.begin();
Row::const_iterator const end = row.end();
for ( ; cit != end ; ++cit)
if (cit->pos >= body_pos
&& cit->inset && pm.hfillExpansion(row, cit->pos))
++n;
return n;
}
} // namespace
/////////////////////////////////////////////////////////////////////
//
// TextMetrics
//
/////////////////////////////////////////////////////////////////////
TextMetrics::TextMetrics(BufferView * bv, Text * text)
: bv_(bv), text_(text), dim_(bv_->workWidth(), 10, 10),
max_width_(dim_.wid), tight_(false)
{}
bool TextMetrics::contains(pit_type pit) const
{
return par_metrics_.find(pit) != par_metrics_.end();
}
pair<pit_type, ParagraphMetrics const *> TextMetrics::first() const
{
ParMetricsCache::const_iterator it = par_metrics_.begin();
return make_pair(it->first, &it->second);
}
pair<pit_type, ParagraphMetrics const *> TextMetrics::last() const
{
LBUFERR(!par_metrics_.empty());
ParMetricsCache::const_reverse_iterator it = par_metrics_.rbegin();
return make_pair(it->first, &it->second);
}
bool TextMetrics::isLastRow(Row const & row) const
{
ParagraphList const & pars = text_->paragraphs();
return row.endpos() >= pars[row.pit()].size()
&& row.pit() + 1 == pit_type(pars.size());
}
bool TextMetrics::isFirstRow(Row const & row) const
{
return row.pos() == 0 && row.pit() == 0;
}
void TextMetrics::setRowChanged(pit_type pit, pos_type pos)
{
for (auto & pm_pair : par_metrics_)
if (pm_pair.first == pit)
for (Row & row : pm_pair.second.rows())
if (row.pos() == pos)
row.changed(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(
make_pair(pit, ParagraphMetrics(text_->getPar(pit)))).first;
}
if (pmc_it->second.rows().empty() && redo)
redoParagraph(pit);
return pmc_it->second;
}
ParagraphMetrics const & TextMetrics::parMetrics(pit_type pit) const
{
return const_cast<TextMetrics *>(this)->parMetrics(pit, true);
}
ParagraphMetrics & TextMetrics::parMetrics(pit_type pit)
{
return parMetrics(pit, true);
}
void TextMetrics::newParMetricsDown()
{
pair<pit_type, ParagraphMetrics> const & last = *par_metrics_.rbegin();
pit_type const pit = last.first + 1;
if (pit == int(text_->paragraphs().size()))
return;
// do it and update its position.
redoParagraph(pit);
par_metrics_[pit].setPosition(last.second.position()
+ last.second.descent() + par_metrics_[pit].ascent());
updatePosCache(pit);
}
void TextMetrics::newParMetricsUp()
{
pair<pit_type, ParagraphMetrics> const & first = *par_metrics_.begin();
if (first.first == 0)
return;
pit_type const pit = first.first - 1;
// do it and update its position.
redoParagraph(pit);
par_metrics_[pit].setPosition(first.second.position()
- first.second.ascent() - par_metrics_[pit].descent());
updatePosCache(pit);
}
bool TextMetrics::metrics(MetricsInfo const & mi, Dimension & dim, int min_width)
{
LBUFERR(mi.base.textwidth > 0);
max_width_ = mi.base.textwidth;
tight_ = mi.tight_insets;
// backup old dimension.
Dimension const old_dim = dim_;
// reset dimension.
dim_ = Dimension();
dim_.wid = min_width;
pit_type const npar = text_->paragraphs().size();
if (npar > 1 && !tight_)
// If there is more than one row, expand the text to
// the full allowable width.
dim_.wid = max_width_;
//lyxerr << "TextMetrics::metrics: width: " << mi.base.textwidth
// << " maxWidth: " << max_width_ << "\nfont: " << mi.base.font << endl;
bool changed = false;
int h = 0;
for (pit_type pit = 0; pit != npar; ++pit) {
// create rows, but do not set alignment yet
changed |= redoParagraph(pit, false);
ParagraphMetrics const & pm = par_metrics_[pit];
h += pm.height();
if (dim_.wid < pm.width())
dim_.wid = pm.width();
}
// Now set alignment for all rows (the width might not have been known before).
for (pit_type pit = 0; pit != npar; ++pit) {
ParagraphMetrics & pm = par_metrics_[pit];
for (Row & row : pm.rows())
setRowAlignment(row, dim_.wid);
}
dim_.asc = par_metrics_[0].ascent();
dim_.des = h - dim_.asc;
//lyxerr << "dim_.wid " << dim_.wid << endl;
//lyxerr << "dim_.asc " << dim_.asc << endl;
//lyxerr << "dim_.des " << dim_.des << endl;
changed |= dim_ != old_dim;
dim = dim_;
return changed;
}
void TextMetrics::updatePosCache(pit_type pit) const
{
frontend::NullPainter np;
PainterInfo pi(bv_, np);
drawParagraph(pi, pit, origin_.x_, par_metrics_[pit].position());
}
int TextMetrics::rightMargin(ParagraphMetrics const & pm) const
{
return text_->isMainText() ? pm.rightMargin(*bv_) : 0;
}
int TextMetrics::rightMargin(pit_type const pit) const
{
return text_->isMainText() ? par_metrics_[pit].rightMargin(*bv_) : 0;
}
void TextMetrics::applyOuterFont(Font & font) const
{
FontInfo lf(font_.fontInfo());
lf.reduce(bv_->buffer().params().getFont().fontInfo());
font.fontInfo().realize(lf);
}
Font TextMetrics::displayFont(pit_type pit, pos_type pos) const
{
LASSERT(pos >= 0, { static Font f; return f; });
ParagraphList const & pars = text_->paragraphs();
Paragraph const & par = pars[pit];
Layout const & layout = par.layout();
Buffer const & buffer = bv_->buffer();
// FIXME: broken?
BufferParams const & params = buffer.params();
pos_type const body_pos = par.beginOfBody();
// We specialize the 95% common case:
if (!par.getDepth()) {
Font f = par.getFontSettings(params, pos);
if (!text_->isMainText())
applyOuterFont(f);
bool lab = layout.labeltype == LABEL_MANUAL && pos < body_pos;
FontInfo const & lf = lab ? layout.labelfont : layout.font;
FontInfo rlf = lab ? layout.reslabelfont : layout.resfont;
// In case the default family has been customized
if (lf.family() == INHERIT_FAMILY)
rlf.setFamily(params.getFont().fontInfo().family());
f.fontInfo().realize(rlf);
return f;
}
// The uncommon case need not be optimized as much
FontInfo const & layoutfont = pos < body_pos ?
layout.labelfont : layout.font;
Font font = par.getFontSettings(params, pos);
font.fontInfo().realize(layoutfont);
if (!text_->isMainText())
applyOuterFont(font);
// Realize against environment font information
// NOTE: the cast to pit_type should be removed when pit_type
// changes to a unsigned integer.
if (pit < pit_type(pars.size()))
font.fontInfo().realize(text_->outerFont(pit).fontInfo());
// Realize with the fonts of lesser depth.
font.fontInfo().realize(params.getFont().fontInfo());
return font;
}
bool TextMetrics::isRTL(CursorSlice const & sl, bool boundary) const
{
if (!sl.text())
return false;
int correction = 0;
if (boundary && sl.pos() > 0)
correction = -1;
return displayFont(sl.pit(), sl.pos() + correction).isVisibleRightToLeft();
}
bool TextMetrics::isRTLBoundary(pit_type pit, pos_type pos) const
{
// no RTL boundary at paragraph start
if (pos == 0)
return false;
Font const & left_font = displayFont(pit, pos - 1);
return isRTLBoundary(pit, pos, left_font);
}
// isRTLBoundary returns false on a real end-of-line boundary,
// because otherwise the two boundary types get mixed up.
// This is the whole purpose of this being in TextMetrics.
bool TextMetrics::isRTLBoundary(pit_type pit, pos_type pos,
Font const & font) const
{
if (// no RTL boundary at paragraph start
pos == 0
// if the metrics have not been calculated, then we are not
// on screen and can safely ignore issues about boundaries.
|| !contains(pit))
return false;
ParagraphMetrics const & pm = par_metrics_[pit];
// no RTL boundary in empty paragraph
if (pm.rows().empty())
return false;
pos_type const endpos = pm.getRow(pos - 1, false).endpos();
pos_type const startpos = pm.getRow(pos, false).pos();
// no RTL boundary at line start:
// abc\n -> toggle to RTL -> abc\n (and not: abc\n|
// | | )
if (pos == startpos && pos == endpos) // start of cur row, end of prev row
return false;
Paragraph const & par = text_->getPar(pit);
// no RTL boundary at line break:
// abc|\n -> move right -> abc\n (and not: abc\n|
// FED FED| FED )
if (startpos == pos && endpos == pos && endpos != par.size()
&& (par.isNewline(pos - 1)
|| par.isEnvSeparator(pos - 1)
|| par.isLineSeparator(pos - 1)
|| par.isSeparator(pos - 1)))
return false;
bool const left = font.isVisibleRightToLeft();
bool right;
if (pos == par.size())
right = par.isRTL(bv_->buffer().params());
else
right = displayFont(pit, pos).isVisibleRightToLeft();
return left != right;
}
bool TextMetrics::redoParagraph(pit_type const pit, bool const align_rows)
{
Paragraph & par = text_->getPar(pit);
// IMPORTANT NOTE: We pass 'false' explicitly in order to not call
// redoParagraph() recursively inside parMetrics.
Dimension old_dim = parMetrics(pit, false).dim();
ParagraphMetrics & pm = par_metrics_[pit];
pm.reset(par);
Buffer & buffer = bv_->buffer();
bool changed = false;
// Check whether there are InsetBibItems that need fixing
// 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, (b) a biblio environment with more than one
// InsetBibitem or (c) a paragraph that has a bib item but is no biblio
// environment? I think the answer is: when paragraphs are merged;
// when layout is set; when material is pasted.
if (par.brokenBiblio()) {
Cursor & cur = bv_->cursor();
// In some cases, we do not know how to record undo
if (&cur.inset() == &text_->inset())
cur.recordUndo(pit, pit);
int const moveCursor = par.fixBiblio(buffer);
// Is it necessary to update the cursor?
if (&cur.inset() == &text_->inset() && cur.pit() == pit) {
if (moveCursor > 0)
cur.posForward();
else if (moveCursor < 0 && cur.pos() >= -moveCursor)
cur.posBackward();
}
}
// Optimisation: this is used in the next two loops
// so better to calculate that once here.
int const right_margin = rightMargin(pm);
// iterator pointing to paragraph to resolve macros
DocIterator parPos = text_->macrocontextPosition();
if (!parPos.empty())
parPos.pit() = pit;
else {
LYXERR(Debug::INFO, "MacroContext not initialised!"
<< " Going through the buffer again and hope"
<< " the context is better then.");
// FIXME audit updateBuffer calls
// This should not be here, but it is not clear yet where else it
// should be.
bv_->buffer().updateBuffer();
parPos = text_->macrocontextPosition();
LBUFERR(!parPos.empty());
parPos.pit() = pit;
}
// redo insets
par.setBeginOfBody();
Font const bufferfont = buffer.params().getFont();
CoordCache::Insets & insetCache = bv_->coordCache().insets();
for (auto const & e : par.insetList()) {
// FIXME Doesn't this HAVE to be non-empty?
// position already initialized?
if (!parPos.empty()) {
parPos.pos() = e.pos;
// A macro template would normally not be visible
// by itself. But the tex macro semantics allow
// recursion, so we artifically take the context
// after the macro template to simulate this.
if (e.inset->lyxCode() == MATHMACRO_CODE)
parPos.pos()++;
}
// If there is an end of paragraph marker, its size should be
// substracted to the available width. The logic here is
// almost the same as in breakRow, remember keep them in sync.
int eop = 0;
if (e.pos + 1 == par.size()
&& (lyxrc.paragraph_markers || par.lookupChange(par.size()).changed())
&& size_type(pit + 1) < text_->paragraphs().size()) {
Font f(text_->layoutFont(pit));
// ¶ U+00B6 PILCROW SIGN
eop = theFontMetrics(f).width(char_type(0x00B6));
}
// do the metric calculation
Dimension dim;
int const w = max_width_ - leftMargin(pit, e.pos)
- right_margin - eop;
Font const & font = e.inset->inheritFont() ?
displayFont(pit, e.pos) : bufferfont;
MacroContext mc(&buffer, parPos);
MetricsInfo mi(bv_, font.fontInfo(), w, mc, e.pos == 0, tight_);
e.inset->metrics(mi, dim);
if (!insetCache.has(e.inset) || insetCache.dim(e.inset) != dim) {
insetCache.add(e.inset, dim);
changed = true;
}
}
pos_type first = 0;
size_t row_index = 0;
bool need_new_row = false;
// maximum pixel width of a row
do {
if (row_index == pm.rows().size())
pm.rows().push_back(Row());
else
pm.rows()[row_index] = Row();
Row & row = pm.rows()[row_index];
row.pit(pit);
row.pos(first);
need_new_row = breakRow(row, right_margin);
setRowHeight(row);
row.changed(true);
if ((row_index || row.endpos() < par.size() || row.right_boundary())
&& !tight_) {
/* If there is more than one row or the row has been
* broken by a display inset or a newline, expand the text
* to the full allowable width. This setting here is
* needed for the setRowAlignment() below.
* We do nothing when tight insets are requested.
*/
if (dim_.wid < max_width_)
dim_.wid = max_width_;
}
if (align_rows)
setRowAlignment(row, max(dim_.wid, row.width()));
first = row.endpos();
++row_index;
pm.dim().wid = max(pm.dim().wid, row.width() + row.right_margin);
pm.dim().des += row.height();
} while (first < par.size() || need_new_row);
if (row_index < pm.rows().size())
pm.rows().resize(row_index);
// This type of margin can only be handled at the global paragraph level
if (par.layout().margintype == MARGIN_RIGHT_ADDRESS_BOX) {
int offset = 0;
if (par.isRTL(buffer.params())) {
// globally align the paragraph to the left.
int minleft = max_width_;
for (Row const & row : pm.rows())
minleft = min(minleft, row.left_margin);
offset = right_margin - minleft;
} else {
// globally align the paragraph to the right.
int maxwid = 0;
for (Row const & row : pm.rows())
maxwid = max(maxwid, row.width());
offset = max_width_ - right_margin - maxwid;
}
for (Row & row : pm.rows()) {
row.left_margin += offset;
row.dim().wid += offset;
}
}
// The space above and below the paragraph.
int top = parTopSpacing(pit);
int bottom = parBottomSpacing(pit);
// Top and bottom margin of the document (only at top-level)
// FIXME: It might be better to move this in another method
// specially tailored for the main text.
if (text_->isMainText()) {
if (pit == 0)
top += bv_->topMargin();
if (pit + 1 == pit_type(text_->paragraphs().size())) {
bottom += bv_->bottomMargin();
}
}
// Add the top/bottom space to rows and paragraph metrics
pm.rows().front().dim().asc += top;
pm.rows().back().dim().des += bottom;
pm.dim().des += top + bottom;
// Move the pm ascent to be the same as the first row ascent
pm.dim().asc += pm.rows().front().ascent();
pm.dim().des -= pm.rows().front().ascent();
changed |= old_dim.height() != pm.dim().height();
return changed;
}
LyXAlignment TextMetrics::getAlign(Paragraph const & par, Row const & row) const
{
LyXAlignment align = par.getAlign(bv_->buffer().params());
// handle alignment inside tabular cells
Inset const & owner = text_->inset();
bool forced_block = false;
switch (owner.contentAlignment()) {
case LYX_ALIGN_BLOCK:
// In general block align is the default state, but here it is
// an explicit choice. Therefore it should not be overridden
// later.
forced_block = true;
// fall through
case LYX_ALIGN_CENTER:
case LYX_ALIGN_LEFT:
case LYX_ALIGN_RIGHT:
if (align == LYX_ALIGN_NONE || align == LYX_ALIGN_BLOCK)
align = owner.contentAlignment();
break;
default:
// unchanged (use align)
break;
}
// Display-style insets should always be on a centered row
if (Inset const * inset = par.getInset(row.pos())) {
if (inset->rowFlags() & Inset::Display) {
if (inset->rowFlags() & Inset::AlignLeft)
align = LYX_ALIGN_BLOCK;
else if (inset->rowFlags() & Inset::AlignRight)
align = LYX_ALIGN_RIGHT;
else
align = LYX_ALIGN_CENTER;
}
}
if (align == LYX_ALIGN_BLOCK) {
// If this row has been broken abruptly by a display inset, or
// it is the end of the paragraph, or the user requested we
// not justify stuff, then don't stretch.
// A forced block alignment can only be overridden the 'no
// justification on screen' setting.
if ((row.flushed() && !forced_block)
|| !bv_->buffer().params().justification)
align = row.isRTL() ? LYX_ALIGN_RIGHT : LYX_ALIGN_LEFT;
}
return align;
}
void TextMetrics::setRowAlignment(Row & row, int width) const
{
row.label_hfill = 0;
row.separator = 0;
Paragraph const & par = text_->getPar(row.pit());
int const w = width - row.right_margin - row.width();
// FIXME: put back this assertion when the crash on new doc is solved.
//LASSERT(w >= 0, /**/);
// is there a manual margin with a manual label
Layout const & layout = par.layout();
int nlh = 0;
if (layout.margintype == MARGIN_MANUAL
&& layout.labeltype == LABEL_MANUAL) {
/// We might have real hfills in the label part
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())
row.label_hfill = labelFill(row) / double(nlh);
}
// are there any hfills in the row?
ParagraphMetrics const & pm = par_metrics_[row.pit()];
int nh = numberOfHfills(row, pm, par.beginOfBody());
int hfill = 0;
int hfill_rem = 0;
// We don't have to look at the alignment if the row is already
// larger then the permitted width as then we force the
// LEFT_ALIGN'edness!
if (row.width() >= max_width_)
return;
if (nh == 0) {
// Common case : there is no hfill, and the alignment will be
// meaningful
switch (getAlign(par, row)) {
case LYX_ALIGN_BLOCK:
// Expand expanding characters by a total of w
if (!row.setExtraWidth(w) && row.isRTL()) {
// Justification failed and the text is RTL: align to the right
row.left_margin += w;
row.dim().wid += w;
}
break;
case LYX_ALIGN_LEFT:
// a displayed inset that is flushed
if (Inset const * inset = par.getInset(row.pos())) {
row.left_margin += inset->indent(*bv_);
row.dim().wid += inset->indent(*bv_);
}
break;
case LYX_ALIGN_RIGHT:
if (Inset const * inset = par.getInset(row.pos())) {
int const new_w = max(w - inset->indent(*bv_), 0);
row.left_margin += new_w;
row.dim().wid += new_w;
} else {
row.left_margin += w;
row.dim().wid += w;
}
break;
case LYX_ALIGN_CENTER:
row.dim().wid += w / 2;
row.left_margin += w / 2;
break;
case LYX_ALIGN_NONE:
case LYX_ALIGN_LAYOUT:
case LYX_ALIGN_SPECIAL:
case LYX_ALIGN_DECIMAL:
break;
}
return;
}
// Case nh > 0. There are hfill separators.
hfill = w / nh;
hfill_rem = w % nh;
row.dim().wid += w;
// Set size of hfill insets
pos_type const endpos = row.endpos();
pos_type body_pos = par.beginOfBody();
if (body_pos > 0
&& (body_pos > endpos || !par.isLineSeparator(body_pos - 1)))
body_pos = 0;
CoordCache::Insets & insetCache = bv_->coordCache().insets();
for (Row::Element & e : row) {
if (row.label_hfill && e.endpos == body_pos
&& e.type == Row::SPACE)
e.dim.wid -= int(row.label_hfill * (nlh - 1));
if (e.inset && pm.hfillExpansion(row, e.pos)) {
if (e.pos >= body_pos) {
e.dim.wid += hfill;
--nh;
if (nh == 0)
e.dim.wid += hfill_rem;
} else
e.dim.wid += int(row.label_hfill);
// Cache the inset dimension.
insetCache.add(e.inset, e.dim);
}
}
}
int TextMetrics::labelFill(Row const & row) const
{
Paragraph const & par = text_->getPar(row.pit());
LBUFERR(par.beginOfBody() > 0 || par.isEnvSeparator(0));
int w = 0;
// iterate over elements before main body (except the last one,
// which is extra space).
for (Row::Element const & e : row) {
if (e.endpos >= par.beginOfBody())
break;
w += e.dim.wid;
}
docstring const & label = par.params().labelWidthString();
if (label.empty())
return 0;
FontMetrics const & fm
= theFontMetrics(text_->labelFont(par));
return max(0, fm.width(label) - w);
}
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 leftMargin(pit);
}
namespace {
/**
* Calling Text::getFont is slow. While rebreaking we scan a
* paragraph from left to right calling getFont for every char. This
* simple class address this problem by hidding an optimization trick
* (not mine btw -AB): the font is reused in the whole font span. The
* class handles transparently the "hidden" (not part of the fontlist)
* label font (as getFont does).
**/
class FontIterator
{
public:
///
FontIterator(TextMetrics const & tm,
Paragraph const & par, pit_type pit, pos_type pos)
: tm_(tm), par_(par), pit_(pit), pos_(pos),
font_(tm.displayFont(pit, pos)),
endspan_(par.fontSpan(pos).last),
bodypos_(par.beginOfBody())
{}
///
Font const & operator*() const { return font_; }
///
FontIterator & operator++()
{
++pos_;
if (pos_ < par_.size() && (pos_ > endspan_ || pos_ == bodypos_)) {
font_ = tm_.displayFont(pit_, pos_);
endspan_ = par_.fontSpan(pos_).last;
}
return *this;
}
///
Font * operator->() { return &font_; }
private:
///
TextMetrics const & tm_;
///
Paragraph const & par_;
///
pit_type pit_;
///
pos_type pos_;
///
Font font_;
///
pos_type endspan_;
///
pos_type bodypos_;
};
} // namespace
/** This is the function where the hard work is done. The code here is
* very sensitive to small changes :) Note that part of the
* intelligence is also in Row::shortenIfNeeded.
*/
bool TextMetrics::breakRow(Row & row, int const right_margin) const
{
LATTEST(row.empty());
Paragraph const & par = text_->getPar(row.pit());
Buffer const & buf = text_->inset().buffer();
BookmarksSection::BookmarkPosList bpl =
theSession().bookmarks().bookmarksInPar(buf.fileName(), par.id());
pos_type const end = par.size();
pos_type const pos = row.pos();
pos_type const body_pos = par.beginOfBody();
bool const is_rtl = text_->isRTL(row.pit());
bool need_new_row = false;
row.left_margin = leftMargin(row.pit(), pos);
row.right_margin = right_margin;
if (is_rtl)
swap(row.left_margin, row.right_margin);
// Remember that the row width takes into account the left_margin
// but not the right_margin.
row.dim().wid = row.left_margin;
// the width available for the row.
int const width = max_width_ - row.right_margin;
// check for possible inline completion
DocIterator const & ic_it = bv_->inlineCompletionPos();
pos_type ic_pos = -1;
if (ic_it.inTexted() && ic_it.text() == text_ && ic_it.pit() == row.pit())
ic_pos = ic_it.pos();
// Now we iterate through until we reach the right margin
// or the end of the par, then build a representation of the row.
pos_type i = pos;
FontIterator fi = FontIterator(*this, par, row.pit(), pos);
// The real stopping condition is a few lines below.
while (true) {
// Firstly, check whether there is a bookmark here.
if (lyxrc.bookmarks_visibility == LyXRC::BMK_INLINE)
for (auto const & bp_p : bpl)
if (bp_p.second == i) {
Font f = *fi;
f.fontInfo().setColor(Color_bookmark);
// ❶ U+2776 DINGBAT NEGATIVE CIRCLED DIGIT ONE
char_type const ch = 0x2775 + bp_p.first;
row.addVirtual(i, docstring(1, ch), f, Change());
}
// The stopping condition is here so that the display of a
// bookmark can take place at paragraph start too.
if (i >= end || (i != pos && row.width() > width))
break;
char_type c = par.getChar(i);
// The most special cases are handled first.
if (par.isInset(i)) {
Inset const * ins = par.getInset(i);
Dimension dim = bv_->coordCache().insets().dim(ins);
row.add(i, ins, dim, *fi, par.lookupChange(i));
} else if (c == ' ' && i + 1 == body_pos) {
// There is a space at i, but it should not be
// added as a separator, because it is just
// before body_pos. Instead, insert some spacing to
// align text
FontMetrics const & fm = theFontMetrics(text_->labelFont(par));
// this is needed to make sure that the row width is correct
row.finalizeLast();
int const add = max(fm.width(par.layout().labelsep),
labelEnd(row.pit()) - row.width());
row.addSpace(i, add, *fi, par.lookupChange(i));
} else if (c == '\t')
row.addSpace(i, theFontMetrics(*fi).width(from_ascii(" ")),
*fi, par.lookupChange(i));
else if (c == 0x2028 || c == 0x2029) {
/**
* U+2028 LINE SEPARATOR
* U+2029 PARAGRAPH SEPARATOR
* These are special unicode characters that break
* lines/pragraphs. Not handling them lead to trouble wrt
* Qt QTextLayout formatting. We add a visible character
* on screen so that the user can see that something is
* happening.
*/
row.finalizeLast();
// ⤶ U+2936 ARROW POINTING DOWNWARDS THEN CURVING LEFTWARDS
// ¶ U+00B6 PILCROW SIGN
char_type const screen_char = (c == 0x2028) ? 0x2936 : 0x00B6;
row.add(i, screen_char, *fi, par.lookupChange(i));
} else
row.add(i, c, *fi, par.lookupChange(i));
// add inline completion width
// draw logically behind the previous character
if (ic_pos == i + 1 && !bv_->inlineCompletion().empty()) {
docstring const comp = bv_->inlineCompletion();
size_t const uniqueTo =bv_->inlineCompletionUniqueChars();
Font f = *fi;
if (uniqueTo > 0) {
f.fontInfo().setColor(Color_inlinecompletion);
row.addVirtual(i + 1, comp.substr(0, uniqueTo), f, Change());
}
f.fontInfo().setColor(Color_nonunique_inlinecompletion);
row.addVirtual(i + 1, comp.substr(uniqueTo), f, Change());
}
// Handle some situations that abruptly terminate the row
// - Before an inset with BreakBefore
// - After an inset with BreakAfter
Inset const * prevInset = !row.empty() ? row.back().inset : 0;
Inset const * nextInset = (i + 1 < end) ? par.getInset(i + 1) : 0;
if ((nextInset && nextInset->rowFlags() & Inset::BreakBefore)
|| (prevInset && prevInset->rowFlags() & Inset::BreakAfter)) {
row.flushed(true);
// Force a row creation after this one if it is ended by
// an inset that either
// - has row flag RowAfter that enforces that;
// - or (1) did force the row breaking, (2) is at end of
// paragraph and (3) the said paragraph has an end label.
need_new_row = prevInset &&
(prevInset->rowFlags() & Inset::RowAfter
|| (prevInset->rowFlags() & Inset::BreakAfter && i + 1 == end
&& text_->getEndLabel(row.pit()) != END_LABEL_NO_LABEL));
++i;
break;
}
++i;
++fi;
}
row.finalizeLast();
row.endpos(i);
// End of paragraph marker. The logic here is almost the
// same as in redoParagraph, remember keep them in sync.
ParagraphList const & pars = text_->paragraphs();
Change const & change = par.lookupChange(i);
if ((lyxrc.paragraph_markers || change.changed())
&& !need_new_row
&& i == end && size_type(row.pit() + 1) < pars.size()) {
// add a virtual element for the end-of-paragraph
// marker; it is shown on screen, but does not exist
// in the paragraph.
Font f(text_->layoutFont(row.pit()));
f.fontInfo().setColor(Color_paragraphmarker);
f.setLanguage(par.getParLanguage(buf.params()));
// ¶ U+00B6 PILCROW SIGN
row.addVirtual(end, docstring(1, char_type(0x00B6)), f, change);
}
// Is there a end-of-paragaph change?
if (i == end && par.lookupChange(end).changed() && !need_new_row)
row.needsChangeBar(true);
// if the row is too large, try to cut at last separator. In case
// of success, reset indication that the row was broken abruptly.
int const next_width = max_width_ - leftMargin(row.pit(), row.endpos())
- rightMargin(row.pit());
if (row.shortenIfNeeded(body_pos, width, next_width))
row.flushed(false);
row.right_boundary(!row.empty() && row.endpos() < end
&& row.back().endpos == row.endpos());
// Last row in paragraph is flushed
if (row.endpos() == end)
row.flushed(true);
// make sure that the RTL elements are in reverse ordering
row.reverseRTL(is_rtl);
//LYXERR0("breakrow: row is " << row);
return need_new_row;
}
int TextMetrics::parTopSpacing(pit_type const pit) const
{
Paragraph const & par = text_->getPar(pit);
Layout const & layout = par.layout();
int asc = 0;
ParagraphList const & pars = text_->paragraphs();
double const dh = defaultRowHeight();
BufferParams const & bparams = bv_->buffer().params();
Inset const & inset = text_->inset();
// some parskips VERY EASY IMPLEMENTATION
if (bparams.paragraph_separation == BufferParams::ParagraphSkipSeparation
&& !inset.getLayout().parbreakIsNewline()
&& !par.layout().parbreak_is_newline
&& pit > 0
&& ((layout.isParagraph() && par.getDepth() == 0)
|| (pars[pit - 1].layout().isParagraph()
&& pars[pit - 1].getDepth() == 0))) {
asc += bparams.getDefSkip().inPixels(*bv_);
}
if (par.params().startOfAppendix())
asc += int(3 * dh);
// special code for the top label
if (layout.labelIsAbove()
&& (!layout.isParagraphGroup() || text_->isFirstInSequence(pit))
&& !par.labelString().empty()) {
FontInfo labelfont = text_->labelFont(par);
FontMetrics const & lfm = theFontMetrics(labelfont);
asc += int(lfm.maxHeight() * layout.spacing.getValue()
* text_->spacing(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 = text_->depthHook(pit, par.getDepth());
Paragraph const & prevpar = pars[prev];
double layoutasc = 0;
if (prev != pit
&& prevpar.layout() == layout
&& prevpar.getDepth() == par.getDepth()
&& prevpar.getLabelWidthString() == par.getLabelWidthString()) {
layoutasc = layout.itemsep * dh;
} else if (pit != 0 && layout.topsep > 0)
layoutasc = layout.topsep * dh;
asc += int(layoutasc * 2 / (2 + pars[pit].getDepth()));
prev = text_->outerHook(pit);
if (prev != pit_type(pars.size())) {
asc += int(pars[prev].layout().parsep * dh);
} else if (pit != 0) {
Paragraph const & prevpar2 = pars[pit - 1];
if (prevpar2.getDepth() != 0 || prevpar2.layout() == layout)
asc += int(layout.parsep * dh);
}
return asc;
}
int TextMetrics::parBottomSpacing(pit_type const pit) const
{
double layoutdesc = 0;
ParagraphList const & pars = text_->paragraphs();
double const dh = defaultRowHeight();
// 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;
if (pars[cpit].getDepth() > pars[nextpit].getDepth()) {
double usual = pars[cpit].layout().bottomsep * dh;
double unusual = 0;
cpit = text_->depthHook(cpit, 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);
}
}
return int(layoutdesc * 2 / (2 + pars[pit].getDepth()));
}
void TextMetrics::setRowHeight(Row & row) const
{
Paragraph const & par = text_->getPar(row.pit());
Layout const & layout = par.layout();
double const spacing_val = layout.spacing.getValue() * text_->spacing(par);
// Initial value for ascent (useful if row is empty).
Font const font = displayFont(row.pit(), row.pos());
FontMetrics const & fm = theFontMetrics(font);
int maxasc = int(fm.maxAscent() * spacing_val);
int maxdes = int(fm.maxDescent() * spacing_val);
// Take label string into account (useful if labelfont is large)
if (row.pos() == 0 && layout.labelIsInline()) {
FontInfo const labelfont = text_->labelFont(par);
FontMetrics const & lfm = theFontMetrics(labelfont);
maxasc = max(maxasc, int(lfm.maxAscent() * spacing_val));
maxdes = max(maxdes, int(lfm.maxDescent() * spacing_val));
}
// Find the ascent/descent of the row contents
for (Row::Element const & e : row) {
if (e.inset) {
maxasc = max(maxasc, e.dim.ascent());
maxdes = max(maxdes, e.dim.descent());
} else {
FontMetrics const & fm2 = theFontMetrics(e.font);
maxasc = max(maxasc, int(fm2.maxAscent() * spacing_val));
maxdes = max(maxdes, int(fm2.maxDescent() * spacing_val));
}
}
// This is nicer with box insets
++maxasc;
++maxdes;
row.dim().asc = maxasc;
row.dim().des = maxdes;
// This is useful for selections
row.contents_dim() = row.dim();
}
// 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::getPosNearX(Row const & row, int & x,
bool & boundary) const
{
//LYXERR0("getPosNearX(" << x << ") row=" << row);
/// 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 = origin_.x_;
x -= xo;
// Adapt to cursor row scroll offset if applicable.
int const offset = bv_->horizScrollOffset(text_, row.pit(), row.pos());
x += offset;
pos_type pos = row.pos();
boundary = false;
if (row.empty())
x = row.left_margin;
else if (x <= row.left_margin) {
pos = row.front().left_pos();
x = row.left_margin;
} else if (x >= row.width()) {
pos = row.back().right_pos();
x = row.width();
} else {
double w = row.left_margin;
Row::const_iterator cit = row.begin();
Row::const_iterator cend = row.end();
for ( ; cit != cend; ++cit) {
if (w <= x && w + cit->full_width() > x) {
int x_offset = int(x - w);
pos = cit->x2pos(x_offset);
x = int(x_offset + w);
break;
}
w += cit->full_width();
}
if (cit == row.end()) {
pos = row.back().right_pos();
x = row.width();
}
/** This tests for the case where the cursor is placed
* just before a font direction change. See comment on
* the boundary_ member in DocIterator.h to understand
* how boundary helps here.
*/
else if (pos == cit->endpos
&& ((!cit->isRTL() && cit + 1 != row.end()
&& (cit + 1)->isRTL())
|| (cit->isRTL() && cit != row.begin()
&& !(cit - 1)->isRTL())))
boundary = true;
}
/** This tests for the case where the cursor is set at the end
* of a row which has been broken due something else than a
* separator (a display inset or a forced breaking of the
* row). We know that there is a separator when the end of the
* row is larger than the end of its last element.
*/
if (!row.empty() && pos == row.back().endpos
&& row.back().endpos == row.endpos()) {
Inset const * inset = row.back().inset;
if (inset && (inset->lyxCode() == NEWLINE_CODE
|| inset->lyxCode() == SEPARATOR_CODE))
pos = row.back().pos;
else
boundary = row.right_boundary();
}
x += xo - offset;
//LYXERR0("getPosNearX ==> pos=" << pos << ", boundary=" << boundary);
return pos;
}
pos_type TextMetrics::x2pos(pit_type pit, int row, int x) const
{
// We play safe and use parMetrics(pit) to make sure the
// ParagraphMetrics will be redone and OK to use if needed.
// Otherwise we would use an empty ParagraphMetrics in
// upDownInText() while in selection mode.
ParagraphMetrics const & pm = parMetrics(pit);
LBUFERR(row < int(pm.rows().size()));
bool bound = false;
Row const & r = pm.rows()[row];
return getPosNearX(r, x, bound);
}
// y is screen coordinate
pit_type TextMetrics::getPitNearY(int y)
{
LASSERT(!text_->paragraphs().empty(), return -1);
LASSERT(!par_metrics_.empty(), return -1);
LYXERR(Debug::DEBUG, "y: " << y << " cache size: " << par_metrics_.size());
// look for highest numbered paragraph with y coordinate less than given y
pit_type pit = -1;
int yy = -1;
ParMetricsCache::const_iterator it = par_metrics_.begin();
ParMetricsCache::const_iterator et = par_metrics_.end();
ParMetricsCache::const_iterator last = et;
--last;
ParagraphMetrics const & pm = it->second;
if (y < it->second.position() - pm.ascent()) {
// We are looking for a position that is before the first paragraph in
// the cache (which is in priciple off-screen, that is before the
// visible part.
if (it->first == 0)
// We are already at the first paragraph in the inset.
return 0;
// OK, this is the paragraph we are looking for.
pit = it->first - 1;
newParMetricsUp();
return pit;
}
ParagraphMetrics const & pm_last = par_metrics_[last->first];
if (y >= last->second.position() + pm_last.descent()) {
// We are looking for a position that is after the last paragraph in
// the cache (which is in priciple off-screen), that is before the
// visible part.
pit = last->first + 1;
if (pit == int(text_->paragraphs().size()))
// We are already at the last paragraph in the inset.
return last->first;
// OK, this is the paragraph we are looking for.
newParMetricsDown();
return pit;
}
for (; it != et; ++it) {
LYXERR(Debug::DEBUG, "examining: pit: " << it->first
<< " y: " << it->second.position());
ParagraphMetrics const & pm2 = par_metrics_[it->first];
if (it->first >= pit && it->second.position() - pm2.ascent() <= y) {
pit = it->first;
yy = it->second.position();
}
}
LYXERR(Debug::DEBUG, "found best y: " << yy << " for pit: " << pit);
return pit;
}
Row const & TextMetrics::getPitAndRowNearY(int & y, pit_type & pit,
bool assert_in_view, bool up)
{
ParagraphMetrics const & pm = par_metrics_[pit];
int yy = pm.position() - pm.ascent();
LBUFERR(!pm.rows().empty());
RowList::const_iterator rit = pm.rows().begin();
RowList::const_iterator rlast = pm.rows().end();
--rlast;
for (; rit != rlast; yy += rit->height(), ++rit)
if (yy + rit->height() > y)
break;
if (assert_in_view) {
if (!up && yy + rit->height() > y) {
if (rit != pm.rows().begin()) {
y = yy;
--rit;
} else if (pit != 0) {
--pit;
newParMetricsUp();
ParagraphMetrics const & pm2 = par_metrics_[pit];
rit = pm2.rows().end();
--rit;
y = yy;
}
} else if (up && yy != y) {
if (rit != rlast) {
y = yy + rit->height();
++rit;
} else if (pit < int(text_->paragraphs().size()) - 1) {
++pit;
newParMetricsDown();
ParagraphMetrics const & pm2 = par_metrics_[pit];
rit = pm2.rows().begin();
y = pm2.position();
}
}
}
return *rit;
}
// x,y are absolute screen coordinates
// sets cursor recursively descending into nested editable insets
Inset * TextMetrics::editXY(Cursor & cur, int x, int y,
bool assert_in_view, bool up)
{
if (lyxerr.debugging(Debug::WORKAREA)) {
LYXERR0("TextMetrics::editXY(cur, " << x << ", " << y << ")");
cur.bv().coordCache().dump();
}
pit_type pit = getPitNearY(y);
LASSERT(pit != -1, return 0);
Row const & row = getPitAndRowNearY(y, pit, assert_in_view, up);
cur.pit() = pit;
// Do we cover an inset?
InsetList::Element * e = checkInsetHit(pit, x, y);
if (!e) {
// No inset, set position in the text
bool bound = false; // is modified by getPosNearX
cur.pos() = getPosNearX(row, x, bound);
cur.boundary(bound);
cur.setCurrentFont();
cur.setTargetX(x);
return 0;
}
Inset * inset = e->inset;
//lyxerr << "inset " << inset << " hit at x: " << x << " y: " << y << endl;
// Set position in front of inset
cur.pos() = e->pos;
cur.boundary(false);
cur.setTargetX(x);
// Try to descend recursively inside the inset.
Inset * edited = inset->editXY(cur, x, y);
// FIXME: it is not clear that the test on position is needed
// Remove it if/when semantics of editXY is clarified
if (cur.text() == text_ && cur.pos() == e->pos) {
// non-editable inset, set cursor after the inset if x is
// nearer to that position (bug 9628)
bool bound = false; // is modified by getPosNearX
cur.pos() = getPosNearX(row, x, bound);
cur.boundary(bound);
cur.setCurrentFont();
cur.setTargetX(x);
}
if (cur.top().text() == text_)
cur.setCurrentFont();
return edited;
}
void TextMetrics::setCursorFromCoordinates(Cursor & cur, int const x, int const y)
{
LASSERT(text_ == cur.text(), return);
pit_type const pit = getPitNearY(y);
LASSERT(pit != -1, return);
ParagraphMetrics const & pm = par_metrics_[pit];
int yy = pm.position() - pm.rows().front().ascent();
LYXERR(Debug::DEBUG, "x: " << x << " y: " << y <<
" pit: " << pit << " yy: " << yy);
int r = 0;
LBUFERR(pm.rows().size());
for (; r < int(pm.rows().size()) - 1; ++r) {
Row const & row = pm.rows()[r];
if (yy + row.height() > y)
break;
yy += row.height();
}
Row const & row = pm.rows()[r];
LYXERR(Debug::DEBUG, "row " << r << " from pos: " << row.pos());
bool bound = false;
int xx = x;
pos_type const pos = getPosNearX(row, xx, bound);
LYXERR(Debug::DEBUG, "setting cursor pit: " << pit << " pos: " << pos);
text_->setCursor(cur, pit, pos, true, bound);
// remember new position.
cur.setTargetX();
}
//takes screen x,y coordinates
InsetList::Element * TextMetrics::checkInsetHit(pit_type pit, int x, int y)
{
Paragraph const & par = text_->paragraphs()[pit];
CoordCache::Insets const & insetCache = bv_->coordCache().getInsets();
LYXERR(Debug::DEBUG, "x: " << x << " y: " << y << " pit: " << pit);
for (InsetList::Element const & e : par.insetList()) {
LYXERR(Debug::DEBUG, "examining inset " << e.inset);
if (insetCache.covers(e.inset, x, y)) {
LYXERR(Debug::DEBUG, "Hit inset: " << e.inset);
return const_cast<InsetList::Element *>(&e);
}
}
LYXERR(Debug::DEBUG, "No inset hit. ");
return nullptr;
}
//takes screen x,y coordinates
Inset * TextMetrics::checkInsetHit(int x, int y)
{
pit_type const pit = getPitNearY(y);
LASSERT(pit != -1, return 0);
InsetList::Element * e = checkInsetHit(pit, x, y);
if (!e)
return 0;
return e->inset;
}
int TextMetrics::cursorX(CursorSlice const & sl,
bool boundary) const
{
LASSERT(sl.text() == text_, return 0);
ParagraphMetrics const & pm = par_metrics_[sl.pit()];
if (pm.rows().empty())
return 0;
Row const & row = pm.getRow(sl.pos(), boundary);
pos_type const pos = sl.pos();
double x = 0;
row.findElement(pos, boundary, x);
return int(x);
}
int TextMetrics::cursorY(CursorSlice const & sl, bool boundary) const
{
//lyxerr << "TextMetrics::cursorY: boundary: " << boundary << endl;
ParagraphMetrics const & pm = parMetrics(sl.pit());
if (pm.rows().empty())
return 0;
int h = 0;
h -= parMetrics(0).rows()[0].ascent();
for (pit_type pit = 0; pit < sl.pit(); ++pit) {
h += parMetrics(pit).height();
}
int pos = sl.pos();
if (pos && boundary)
--pos;
size_t const rend = pm.pos2row(pos);
for (size_t rit = 0; rit != rend; ++rit)
h += pm.rows()[rit].height();
h += pm.rows()[rend].ascent();
return h;
}
// the cursor set functions have a special mechanism. When they
// realize you left an empty paragraph, they will delete it.
bool TextMetrics::cursorHome(Cursor & cur)
{
LASSERT(text_ == cur.text(), return false);
ParagraphMetrics const & pm = par_metrics_[cur.pit()];
Row const & row = pm.getRow(cur.pos(),cur.boundary());
return text_->setCursor(cur, cur.pit(), row.pos());
}
bool TextMetrics::cursorEnd(Cursor & cur)
{
LASSERT(text_ == cur.text(), return false);
// if not on the last row of the par, put the cursor before
// the final space exept if I have a spanning inset or one string
// is so long that we force a break.
pos_type end = cur.textRow().endpos();
if (end == 0)
// empty text, end-1 is no valid position
return false;
bool boundary = false;
if (end != cur.lastpos()) {
if (!cur.paragraph().isLineSeparator(end-1)
&& !cur.paragraph().isNewline(end-1)
&& !cur.paragraph().isEnvSeparator(end-1))
boundary = true;
else
--end;
} else if (cur.paragraph().isEnvSeparator(end-1))
--end;
return text_->setCursor(cur, cur.pit(), end, true, boundary);
}
void TextMetrics::deleteLineForward(Cursor & cur)
{
LASSERT(text_ == cur.text(), return);
if (cur.lastpos() == 0) {
// Paragraph is empty, so we just go forward
text_->cursorForward(cur);
} else {
cur.resetAnchor();
cur.selection(true); // to avoid deletion
cursorEnd(cur);
cur.setSelection();
// What is this test for ??? (JMarc)
if (!cur.selection())
text_->deleteWordForward(cur);
else
cap::cutSelection(cur, false);
cur.checkBufferStructure();
}
}
int TextMetrics::leftMargin(pit_type pit) const
{
// FIXME: what is the semantics? It depends on whether the
// paragraph is empty!
return leftMargin(pit, text_->paragraphs()[pit].size());
}
int TextMetrics::leftMargin(pit_type const pit, pos_type const pos) const
{
ParagraphList const & pars = text_->paragraphs();
LASSERT(pit >= 0, return 0);
LASSERT(pit < int(pars.size()), return 0);
Paragraph const & par = pars[pit];
LASSERT(pos >= 0, return 0);
// We do not really care whether pos > par.size(), since we do not
// access the data. It can be actually useful, when querying the
// margin without indentation (see leftMargin(pit_type).
Buffer const & buffer = bv_->buffer();
//lyxerr << "TextMetrics::leftMargin: pit: " << pit << " pos: " << pos << endl;
DocumentClass const & tclass = buffer.params().documentClass();
Layout const & layout = par.layout();
FontMetrics const & bfm = theFontMetrics(buffer.params().getFont());
docstring parindent = layout.parindent;
int l_margin = 0;
if (text_->isMainText()) {
l_margin += bv_->leftMargin();
l_margin += bfm.signedWidth(tclass.leftmargin());
}
int depth = par.getDepth();
if (depth != 0) {
// find the next level paragraph
pit_type newpar = text_->outerHook(pit);
if (newpar != pit_type(pars.size())) {
if (pars[newpar].layout().isEnvironment()) {
int nestmargin = depth * nestMargin();
if (text_->isMainText())
nestmargin += changebarMargin();
l_margin = max(leftMargin(newpar), nestmargin);
// Remove the parindent that has been added
// if the paragraph was empty.
if (pars[newpar].empty() &&
buffer.params().paragraph_separation ==
BufferParams::ParagraphIndentSeparation) {
docstring pi = pars[newpar].layout().parindent;
l_margin -= bfm.signedWidth(pi);
}
}
if (tclass.isDefaultLayout(par.layout())
|| tclass.isPlainLayout(par.layout())) {
if (pars[newpar].params().noindent())
parindent.erase();
else
parindent = pars[newpar].layout().parindent;
}
}
}
// This happens after sections or environments in standard classes.
// We have to check the previous layout at same depth.
if (buffer.params().paragraph_separation ==
BufferParams::ParagraphSkipSeparation)
parindent.erase();
else if (pit > 0 && pars[pit - 1].getDepth() >= par.getDepth()) {
pit_type prev = text_->depthHook(pit, par.getDepth());
if (par.layout() == pars[prev].layout()) {
if (prev != pit - 1
&& pars[pit - 1].layout().nextnoindent)
parindent.erase();
} else if (pars[prev].layout().nextnoindent)
parindent.erase();
}
FontInfo const labelfont = text_->labelFont(par);
FontMetrics const & lfm = theFontMetrics(labelfont);
switch (layout.margintype) {
case MARGIN_DYNAMIC:
if (!layout.leftmargin.empty()) {
l_margin += bfm.signedWidth(layout.leftmargin);
}
if (!par.labelString().empty()) {
l_margin += lfm.signedWidth(layout.labelindent);
l_margin += lfm.width(par.labelString());
l_margin += lfm.width(layout.labelsep);
}
break;
case MARGIN_MANUAL: {
l_margin += lfm.signedWidth(layout.labelindent);
// The width of an empty par, even with manual label, should be 0
if (!par.empty() && pos >= par.beginOfBody()) {
if (!par.getLabelWidthString().empty()) {
docstring labstr = par.getLabelWidthString();
l_margin += lfm.width(labstr);
l_margin += lfm.width(layout.labelsep);
}
}
break;
}
case MARGIN_STATIC: {
l_margin += bfm.signedWidth(layout.leftmargin) * 4
/ (par.getDepth() + 4);
break;
}
case MARGIN_FIRST_DYNAMIC:
if (layout.labeltype == LABEL_MANUAL) {
// if we are at position 0, we are never in the body
if (pos > 0 && pos >= par.beginOfBody())
l_margin += lfm.signedWidth(layout.leftmargin);
else
l_margin += lfm.signedWidth(layout.labelindent);
} else if (pos != 0
// Special case to fix problems with
// theorems (JMarc)
|| (layout.labeltype == LABEL_STATIC
&& layout.latextype == LATEX_ENVIRONMENT
&& !text_->isFirstInSequence(pit))) {
l_margin += lfm.signedWidth(layout.leftmargin);
} else if (!layout.labelIsAbove()) {
l_margin += lfm.signedWidth(layout.labelindent);
l_margin += lfm.width(layout.labelsep);
l_margin += lfm.width(par.labelString());
}
break;
case MARGIN_RIGHT_ADDRESS_BOX:
// This is handled globally in redoParagraph().
break;
}
if (!par.params().leftIndent().zero())
l_margin += par.params().leftIndent().inPixels(max_width_, lfm.em());
LyXAlignment align = par.getAlign(bv_->buffer().params());
// set the correct parindent
if (pos == 0
&& (layout.labeltype == LABEL_NO_LABEL
|| layout.labeltype == LABEL_ABOVE
|| layout.labeltype == LABEL_CENTERED
|| (layout.labeltype == LABEL_STATIC
&& layout.latextype == LATEX_ENVIRONMENT
&& !text_->isFirstInSequence(pit)))
&& (align == LYX_ALIGN_BLOCK || align == LYX_ALIGN_LEFT)
&& !par.params().noindent()
// in some insets, paragraphs are never indented
&& !text_->inset().neverIndent()
// display style insets do not need indentation
&& !(!par.empty()
&& par.isInset(0)
&& par.getInset(0)->rowFlags() & Inset::Display)
&& (!(tclass.isDefaultLayout(par.layout())
|| tclass.isPlainLayout(par.layout()))
|| buffer.params().paragraph_separation
== BufferParams::ParagraphIndentSeparation)) {
/* use the parindent of the layout when the default
* indentation is used otherwise use the indentation set in
* the document settings
*/
if (buffer.params().getParIndent().empty())
l_margin += bfm.signedWidth(parindent);
else
l_margin += buffer.params().getParIndent().inPixels(max_width_, bfm.em());
}
return l_margin;
}
void TextMetrics::draw(PainterInfo & pi, int x, int y) const
{
if (par_metrics_.empty())
return;
origin_.x_ = x;
origin_.y_ = y;
y -= par_metrics_.begin()->second.ascent();
for (auto & pm_pair : par_metrics_) {
pit_type const pit = pm_pair.first;
ParagraphMetrics & pm = pm_pair.second;
y += pm.ascent();
// Save the paragraph position in the cache.
pm.setPosition(y);
drawParagraph(pi, pit, x, y);
y += pm.descent();
}
}
void TextMetrics::drawParagraph(PainterInfo & pi, pit_type const pit, int const x, int y) const
{
ParagraphMetrics const & pm = par_metrics_[pit];
if (pm.rows().empty())
return;
size_t const nrows = pm.rows().size();
// Remember left and right margin for drawing math numbers
Changer changeleft = changeVar(pi.leftx, x + leftMargin(pit));
Changer changeright = changeVar(pi.rightx, x + width() - rightMargin(pit));
// Use fast lane in nodraw stage.
if (pi.pain.isNull()) {
for (size_t i = 0; i != nrows; ++i) {
Row const & row = pm.rows()[i];
// Adapt to cursor row scroll offset if applicable.
int row_x = x - bv_->horizScrollOffset(text_, pit, row.pos());
if (i)
y += row.ascent();
RowPainter rp(pi, *text_, row, row_x, y);
rp.paintOnlyInsets();
y += row.descent();
}
return;
}
int const ww = bv_->workHeight();
Cursor const & cur = bv_->cursor();
DocIterator sel_beg = cur.selectionBegin();
DocIterator sel_end = cur.selectionEnd();
bool selection = cur.selection()
// This is our text.
&& cur.text() == text_
// if the anchor is outside, this is not our selection
&& cur.normalAnchor().text() == text_
&& pit >= sel_beg.pit() && pit <= sel_end.pit();
// We store the begin and end pos of the selection relative to this par
DocIterator sel_beg_par = cur.selectionBegin();
DocIterator sel_end_par = cur.selectionEnd();
// We care only about visible selection.
if (selection) {
if (pit != sel_beg.pit()) {
sel_beg_par.pit() = pit;
sel_beg_par.pos() = 0;
}
if (pit != sel_end.pit()) {
sel_end_par.pit() = pit;
sel_end_par.pos() = sel_end_par.lastpos();
}
}
if (text_->isRTL(pit))
swap(pi.leftx, pi.rightx);
BookmarksSection::BookmarkPosList bpl =
theSession().bookmarks().bookmarksInPar(bv_->buffer().fileName(), pm.par().id());
for (size_t i = 0; i != nrows; ++i) {
Row const & row = pm.rows()[i];
// Adapt to cursor row scroll offset if applicable.
int row_x = x - bv_->horizScrollOffset(text_, pit, row.pos());
if (i)
y += row.ascent();
// It is not needed to draw on screen if we are not inside.
bool const inside = (y + row.descent() >= 0
&& y - row.ascent() < ww);
if (!inside) {
// Inset positions have already been set in nodraw stage.
y += row.descent();
continue;
}
if (selection)
row.setSelectionAndMargins(sel_beg_par, sel_end_par);
else
row.clearSelectionAndMargins();
// The row knows nothing about the paragraph, so we have to check
// whether this row is the first or last and update the margins.
if (row.selection()) {
if (row.sel_beg == 0)
row.change(row.begin_margin_sel, sel_beg.pit() < pit);
if (row.sel_end == sel_end_par.lastpos())
row.change(row.end_margin_sel, sel_end.pit() > pit);
}
// Take this opportunity to spellcheck the row contents.
if (row.changed() && pi.do_spellcheck && lyxrc.spellcheck_continuously) {
text_->getPar(pit).spellCheck();
}
RowPainter rp(pi, *text_, row, row_x, y);
// Don't paint the row if a full repaint has not been requested
// and if it has not changed.
if (!pi.full_repaint && !row.changed()) {
// Paint only the insets if the text itself is
// unchanged.
rp.paintOnlyInsets();
rp.paintTooLargeMarks(
row_x + row.left_x() < bv_->leftMargin(),
row_x + row.right_x() > bv_->workWidth() - bv_->rightMargin());
row.changed(false);
y += row.descent();
continue;
}
// Clear background of this row if paragraph background was not
// already cleared because of a full repaint.
if (!pi.full_repaint && row.changed()) {
LYXERR(Debug::PAINTING, "Clear rect@("
<< max(row_x, 0) << ", " << y - row.ascent() << ")="
<< width() << " x " << row.height());
pi.pain.fillRectangle(row_x, y - row.ascent(),
width(), row.height(), pi.background_color);
}
// Instrumentation for testing row cache (see also
// 12 lines lower):
if (lyxerr.debugging(Debug::PAINTING)
&& (row.selection() || pi.full_repaint || row.changed())) {
string const foreword = text_->isMainText() ? "main text redraw "
: "inset text redraw: ";
LYXERR0(foreword << "pit=" << pit << " row=" << i
<< (row.selection() ? " row_selection": "")
<< (pi.full_repaint ? " full_repaint" : "")
<< (row.changed() ? " row.changed" : ""));
}
// Backup full_repaint status and force full repaint
// for inner insets as the Row has been cleared out.
bool tmp = pi.full_repaint;
pi.full_repaint = true;
rp.paintSelection();
rp.paintAppendix();
rp.paintDepthBar();
if (row.needsChangeBar())
rp.paintChangeBar();
if (i == 0)
rp.paintFirst();
if (i == nrows - 1)
rp.paintLast();
rp.paintText();
rp.paintTooLargeMarks(
row_x + row.left_x() < bv_->leftMargin(),
row_x + row.right_x() > bv_->workWidth() - bv_->rightMargin());
// indicate bookmarks presence in margin
if (lyxrc.bookmarks_visibility == LyXRC::BMK_MARGIN)
for (auto const & bp_p : bpl)
if (bp_p.second >= row.pos() && bp_p.second < row.endpos())
rp.paintBookmark(bp_p.first);
y += row.descent();
#if 0
// This debug code shows on screen which rows are repainted.
// FIXME: since the updates related to caret blinking restrict
// the painter to a small rectangle, the numbers are not
// updated when this happens. Change the code in
// GuiWorkArea::Private::show/hideCaret if this is important.
static int count = 0;
++count;
FontInfo fi(sane_font);
fi.setSize(TINY_SIZE);
fi.setColor(Color_red);
pi.pain.text(row_x, y, convert<docstring>(count), fi);
#endif
// Restore full_repaint status.
pi.full_repaint = tmp;
row.changed(false);
}
//LYXERR(Debug::PAINTING, ".");
}
void TextMetrics::completionPosAndDim(Cursor const & cur, int & x, int & y,
Dimension & dim) const
{
DocIterator from = cur.bv().cursor();
DocIterator to = from;
text_->getWord(from.top(), to.top(), PREVIOUS_WORD);
// The vertical dimension of the word
Font const font = displayFont(cur.pit(), from.pos());
FontMetrics const & fm = theFontMetrics(font);
// the +1's below are related to the extra pixels added in setRowHeight
dim.asc = fm.maxAscent() + 1;
dim.des = fm.maxDescent() + 1;
// get position on screen of the word start and end
//FIXME: Is it necessary to explicitly set this to false?
from.boundary(false);
Point lxy = cur.bv().getPos(from);
Point rxy = cur.bv().getPos(to);
dim.wid = abs(rxy.x_ - lxy.x_);
// calculate position of word
y = lxy.y_;
x = min(rxy.x_, lxy.x_);
//lyxerr << "wid=" << dim.width() << " x=" << x << " y=" << y << " lxy.x_=" << lxy.x_ << " rxy.x_=" << rxy.x_ << " word=" << word << std::endl;
//lyxerr << " wordstart=" << wordStart << " bvcur=" << bvcur << " cur=" << cur << std::endl;
}
int defaultRowHeight()
{
return int(theFontMetrics(sane_font).maxHeight() * 1.2);
}
} // namespace lyx
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