#include "Row.h"
#include "DocIterator.h"
+#include "Language.h"
#include "frontends/FontMetrics.h"
#include "support/debug.h"
#include "support/lassert.h"
+#include "support/lstrings.h"
+#include "support/lyxalgo.h"
-#include <algorithm>
#include <ostream>
using namespace std;
namespace lyx {
+using support::rtrim;
using frontend::FontMetrics;
-double Row::Element::pos2x(pos_type const i) const
+
+// Maximum length that a space can be stretched when justifying text
+static double const MAX_SPACE_STRETCH = 1.5; //em
+
+
+int Row::Element::countSeparators() const
+{
+ if (type != STRING)
+ return 0;
+ return count(str.begin(), str.end(), ' ');
+}
+
+
+int Row::Element::countExpanders() const
+{
+ if (type != STRING)
+ return 0;
+ return theFontMetrics(font).countExpanders(str);
+}
+
+
+int Row::Element::expansionAmount() const
+{
+ if (type != STRING)
+ return 0;
+ return countExpanders() * theFontMetrics(font).em();
+}
+
+
+void Row::Element::setExtra(double extra_per_em)
{
- LASSERT(i >= pos && i <= endpos, return 0);
+ if (type != STRING)
+ return;
+ extra = extra_per_em * theFontMetrics(font).em();
+}
+
- bool const rtl = font.isVisibleRightToLeft();
+double Row::Element::pos2x(pos_type const i) const
+{
+ // This can happen with inline completion when clicking on the
+ // row after the completion.
+ if (i < pos || i > endpos)
+ return 0;
- int w = 0;
+ double w = 0;
//handle first the two bounds of the element
- if (i == pos)
- w = 0;
- else if (i == endpos)
- w = width();
+ if (i == endpos && type != VIRTUAL)
+ w = isRTL() ? 0 : full_width();
+ else if (i == pos || type != STRING)
+ w = isRTL() ? full_width() : 0;
else {
- LASSERT(type == STRING, return 0);
FontMetrics const & fm = theFontMetrics(font);
- // FIXME Avoid caching of metrics there?
- w = fm.width(str.substr(0, i - pos));
+ w = fm.pos2x(str, i - pos, isRTL(), extra);
}
- if (rtl)
- return width() - w;
- else
- return w;
+ return w;
}
-pos_type Row::Element::x2pos(double &x, bool const low) const
+pos_type Row::Element::x2pos(int &x) const
{
//lyxerr << "x2pos: x=" << x << " w=" << width() << " " << *this;
- // if element is rtl, flip x value
- bool const rtl = font.isVisibleRightToLeft();
- double x2 = rtl ? (width() - x) : x;
-
- FontMetrics const & fm = theFontMetrics(font);
- double last_w = 0;
- double w = 0;
size_t i = 0;
- // non-STRING element only contain one position
- if (type != STRING) {
- w = width();
- } else {
- // FIXME: implement dichotomy search?
- for ( ; i < str.size() ; ++i) {
- last_w = w;
- w = fm.width(str.substr(0, i + 1));
- if (w > x2)
- break;
+
+ switch (type) {
+ case STRING: {
+ FontMetrics const & fm = theFontMetrics(font);
+ i = fm.x2pos(str, x, isRTL(), extra);
+ break;
+ }
+ case VIRTUAL:
+ // those elements are actually empty (but they have a width)
+ i = 0;
+ x = isRTL() ? int(full_width()) : 0;
+ break;
+ case INSET:
+ case SPACE:
+ // those elements contain only one position. Round to
+ // the closest side.
+ if (x > (full_width() + 1) / 2) {
+ x = int(full_width());
+ i = !isRTL();
+ } else {
+ x = 0;
+ i = isRTL();
}
- // if (i == str.size())
- // lyxerr << " NOT FOUND ";
}
+ //lyxerr << "=> p=" << pos + i << " x=" << x << endl;
+ return pos + i;
+}
- if (type == STRING && i == str.size())
- x2 = w;
- // round to the closest side. The !rtl is here to obtain the
- // same rounding as with the old code (this is cosmetic and
- // can be eventually removed).
- else if (!low && (x2 - last_w + !rtl > w - x2)) {
- x2 = w;
- ++i;
- } else
- x2 = last_w;
-
- // is element is rtl, flip values
- if (rtl) {
- x = width() - x2;
- } else {
- x = x2;
+
+bool Row::Element::breakAt(int w, bool force)
+{
+ if (type != STRING || dim.wid <= w)
+ return false;
+
+ FontMetrics const & fm = theFontMetrics(font);
+ int x = w;
+ if(fm.breakAt(str, x, isRTL(), force)) {
+ dim.wid = x;
+ endpos = pos + str.length();
+ //lyxerr << "breakAt(" << w << ") Row element Broken at " << x << "(w(str)=" << fm.width(str) << "): e=" << *this << endl;
+ return true;
}
- //lyxerr << "=> p=" << i << " x=" << x << endl;
- return pos + i;
+ return false;
}
-Row::Row()
- : separator(0), label_hfill(0), x(0), right_margin(0),
- sel_beg(-1), sel_end(-1),
- begin_margin_sel(false), end_margin_sel(false),
- changed_(false), crc_(0), pos_(0), end_(0), right_boundary_(false)
-{}
+pos_type Row::Element::left_pos() const
+{
+ return isRTL() ? endpos : pos;
+}
-void Row::setCrc(size_type crc) const
+pos_type Row::Element::right_pos() const
{
- changed_ = crc != crc_;
- crc_ = crc;
+ return isRTL() ? pos : endpos;
}
+Row::Row()
+ : separator(0), label_hfill(0), left_margin(0), right_margin(0),
+ sel_beg(-1), sel_end(-1),
+ begin_margin_sel(false), end_margin_sel(false),
+ changed_(true),
+ pit_(0), pos_(0), end_(0),
+ right_boundary_(false), flushed_(false), rtl_(false),
+ changebar_(false)
+{}
+
+
bool Row::isMarginSelected(bool left_margin, DocIterator const & beg,
DocIterator const & end) const
{
setSelection(beg.pos(), end.pos());
if (selection()) {
- end_margin_sel = isMarginSelected(false, beg, end);
- begin_margin_sel = isMarginSelected(true, beg, end);
+ change(end_margin_sel, isMarginSelected(false, beg, end));
+ change(begin_margin_sel, isMarginSelected(true, beg, end));
}
}
void Row::setSelection(pos_type beg, pos_type end) const
{
if (pos_ >= beg && pos_ <= end)
- sel_beg = pos_;
+ change(sel_beg, pos_);
else if (beg > pos_ && beg <= end_)
- sel_beg = beg;
+ change(sel_beg, beg);
else
- sel_beg = -1;
+ change(sel_beg, -1);
if (end_ >= beg && end_ <= end)
- sel_end = end_;
+ change(sel_end,end_);
else if (end < end_ && end >= pos_)
- sel_end = end;
+ change(sel_end, end);
else
- sel_end = -1;
+ change(sel_end, -1);
}
ostream & operator<<(ostream & os, Row::Element const & e)
{
- if (e.font.isVisibleRightToLeft())
+ if (e.isRTL())
os << e.endpos << "<<" << e.pos << " ";
else
os << e.pos << ">>" << e.endpos << " ";
switch (e.type) {
case Row::STRING:
- os << "STRING: `" << to_utf8(e.str) << "' " << e.dim.wid;
+ os << "STRING: `" << to_utf8(e.str) << "' ("
+ << e.countExpanders() << " expanders.), ";
break;
case Row::VIRTUAL:
- os << "VIRTUAL: `" << to_utf8(e.str) << "'";
+ os << "VIRTUAL: `" << to_utf8(e.str) << "', ";
break;
case Row::INSET:
- os << "INSET: " << to_utf8(e.inset->layoutName());
- break;
- case Row::SEPARATOR:
- os << "SEPARATOR: " << e.dim.wid << "+" << e.extra;
+ os << "INSET: " << to_utf8(e.inset->layoutName()) << ", ";
break;
case Row::SPACE:
- os << "SPACE: " << e.dim.wid;
+ os << "SPACE: ";
break;
}
+ os << "width=" << e.full_width();
return os;
}
ostream & operator<<(ostream & os, Row const & row)
{
os << " pos: " << row.pos_ << " end: " << row.end_
- << " x: " << row.x
+ << " left_margin: " << row.left_margin
<< " width: " << row.dim_.wid
<< " right_margin: " << row.right_margin
<< " ascent: " << row.dim_.asc
<< " descent: " << row.dim_.des
<< " separator: " << row.separator
- << " label_hfill : " << row.label_hfill << "\n";
- double x = row.x;
+ << " label_hfill: " << row.label_hfill
+ << " row_boundary: " << row.right_boundary() << "\n";
+ double x = row.left_margin;
Row::Elements::const_iterator it = row.elements_.begin();
for ( ; it != row.elements_.end() ; ++it) {
os << "x=" << x << " => " << *it << endl;
- x += it->width();
+ x += it->full_width();
}
return os;
}
+int Row::left_x() const
+{
+ double x = left_margin;
+ const_iterator const end = elements_.end();
+ const_iterator cit = elements_.begin();
+ while (cit != end && cit->isVirtual()) {
+ x += cit->full_width();
+ ++cit;
+ }
+ return int(x + 0.5);
+}
+
+
+int Row::right_x() const
+{
+ double x = dim_.wid;
+ const_iterator const begin = elements_.begin();
+ const_iterator cit = elements_.end();
+ while (cit != begin) {
+ --cit;
+ if (cit->isVirtual())
+ x -= cit->full_width();
+ else
+ break;
+ }
+ return int(x + 0.5);
+}
+
+
+int Row::countSeparators() const
+{
+ int n = 0;
+ const_iterator const end = elements_.end();
+ for (const_iterator cit = elements_.begin() ; cit != end ; ++cit)
+ n += cit->countSeparators();
+ return n;
+}
+
+
+bool Row::setExtraWidth(int w)
+{
+ if (w < 0)
+ // this is not expected to happen (but it does)
+ return false;
+ // amount of expansion: number of expanders time the em value for each
+ // string element
+ int exp_amount = 0;
+ for (Row::Element const & e : elements_)
+ exp_amount += e.expansionAmount();
+ if (!exp_amount)
+ return false;
+ // extra length per expander per em
+ double extra_per_em = double(w) / exp_amount;
+ if (extra_per_em > MAX_SPACE_STRETCH)
+ // do not stretch more than MAX_SPACE_STRETCH em per expander
+ return false;
+ // add extra length to each element proportionally to its em.
+ for (Row::Element & e : elements_)
+ if (e.type == Row::STRING)
+ e.setExtra(extra_per_em);
+ // update row dimension
+ dim_.wid += w;
+ return true;
+}
+
+
bool Row::sameString(Font const & f, Change const & ch) const
{
if (elements_.empty())
if (elt.final)
return;
elt.final = true;
+ if (elt.change.changed())
+ changebar_ = true;
if (elt.type == STRING) {
+ dim_.wid -= elt.dim.wid;
elt.dim.wid = theFontMetrics(elt.font).width(elt.str);
dim_.wid += elt.dim.wid;
}
Element e(STRING, pos, f, ch);
elements_.push_back(e);
}
- //lyxerr << "FONT " <<back().font.language() << endl;
- back().str += c;
- back().endpos = pos + 1;
+ if (back().str.length() % 30 == 0) {
+ dim_.wid -= back().dim.wid;
+ back().str += c;
+ back().endpos = pos + 1;
+ back().dim.wid = theFontMetrics(back().font).width(back().str);
+ dim_.wid += back().dim.wid;
+ } else {
+ back().str += c;
+ back().endpos = pos + 1;
+ }
}
finalizeLast();
Element e(VIRTUAL, pos, f, ch);
e.str = s;
- // A completion has no size
+ e.dim.wid = theFontMetrics(f).width(s);
+ dim_.wid += e.dim.wid;
e.endpos = pos;
elements_.push_back(e);
finalizeLast();
}
-void Row::addSeparator(pos_type const pos, char_type const c,
- Font const & f, Change const & ch)
-{
- finalizeLast();
- Element e(SEPARATOR, pos, f, ch);
- e.str += c;
- e.dim.wid = theFontMetrics(f).width(c);
- elements_.push_back(e);
- dim_.wid += e.dim.wid;
-}
-
-
void Row::addSpace(pos_type const pos, int const width,
Font const & f, Change const & ch)
{
}
-void Row::shorten_if_needed(pos_type const keep, int const w)
+bool Row::shortenIfNeeded(pos_type const keep, int const w, int const next_width)
{
- if (empty() || width() < w)
- return;
+ if (empty() || width() <= w)
+ return false;
- /** First, we try to remove elements one by one from the end
- * until a separator is found.
- */
- int i = elements_.size();
- int new_end = end_;
- int new_wid = dim_.wid;
- if (i > 0 && elements_[i - 1].type == SEPARATOR && new_end > keep) {
- --i;
- new_end = elements_[i].pos;
- new_wid -= elements_[i].dim.wid;
+ Elements::iterator const beg = elements_.begin();
+ Elements::iterator const end = elements_.end();
+ int wid = left_margin;
+
+ // Search for the first element that goes beyond right margin
+ Elements::iterator cit = beg;
+ for ( ; cit != end ; ++cit) {
+ if (wid + cit->dim.wid > w)
+ break;
+ wid += cit->dim.wid;
}
- while (i > 0 && elements_[i - 1].type != SEPARATOR && new_end > keep) {
- --i;
- new_end = elements_[i].pos;
- new_wid -= elements_[i].dim.wid;
+ if (cit == end) {
+ // This should not happen since the row is too long.
+ LYXERR0("Something is wrong cannot shorten row: " << *this);
+ return false;
}
- if (i == 0) {
- /* If we are here, it means that we have not found a
- * separator to shorten the row. There is one case
- * where we can do something: when we have one big
- * string, maybe with a paragraph marker after it.
+
+ // Iterate backwards over breakable elements and try to break them
+ Elements::iterator cit_brk = cit;
+ int wid_brk = wid + cit_brk->dim.wid;
+ ++cit_brk;
+ while (cit_brk != beg) {
+ --cit_brk;
+ // make a copy of the element to work on it.
+ Element brk = *cit_brk;
+ wid_brk -= brk.dim.wid;
+ /*
+ * Some Asian languages split lines anywhere (no notion of
+ * word). It seems that QTextLayout is not aware of this fact.
+ * See for reference:
+ * https://en.wikipedia.org/wiki/Line_breaking_rules_in_East_Asian_languages
+ *
+ * FIXME: Something shall be done about characters which are
+ * not allowed at the beginning or end of line.
+ *
+ * FIXME: hardcoding languages is bad. Put this information in
+ * `languages' file.
+ */
+ string const lang = brk.font.language()->lang();
+ bool force = lang == "chinese-simplified"
+ || lang == "chinese-traditional"
+ || lang == "japanese"
+ || lang == "japanese-cjk"
+ || lang == "korean";
+ // FIXME: is it important to check for separators?
+ if ((!force && brk.countSeparators() == 0) || brk.pos < keep)
+ continue;
+ /* We have found a suitable separable element. This is the common case.
+ * Try to break it cleanly (at word boundary) at a length that is both
+ * - less than the available space on the row
+ * - shorter than the natural width of the element, in order to enforce
+ * break-up.
*/
- Element & front = elements_.front();
- if (!(front.type == STRING
- && (elements_.size() == 1
- || (elements_.size() == 2
- && back().type == VIRTUAL))))
- return;
-
- // If this is a string element, we can try to split it.
- if (front.type != STRING)
- return;
- double xstr = w - x;
- // If there is a paragraph marker, it should be taken in account
- if (elements_.size() == 2)
- xstr -= back().width();
- pos_type new_pos = front.x2pos(xstr, true);
- front.str = front.str.substr(0, new_pos - pos_);
- front.dim.wid = xstr;
- front.endpos = new_pos;
- end_ = new_pos;
- dim_.wid = x + xstr;
- // If there is a paragraph marker, it should be removed.
- if (elements_.size() == 2)
- elements_.pop_back();
- return;
+ if (brk.breakAt(min(w - wid_brk, brk.dim.wid - 2), force)) {
+ /* if this element originally did not cause a row overflow
+ * in itself, and the remainder of the row would still be
+ * too large after breaking, then we will have issues in
+ * next row. Thus breaking does not help.
+ */
+ if (wid_brk + cit_brk->dim.wid < w
+ && dim_.wid - (wid_brk + brk.dim.wid) >= next_width) {
+ break;
+ }
+ end_ = brk.endpos;
+ /* after breakAt, there may be spaces at the end of the
+ * string, but they are not counted in the string length
+ * (QTextLayout feature, actually). We remove them, but do
+ * not change the end of the row, since spaces at row
+ * break are invisible.
+ */
+ brk.str = rtrim(brk.str);
+ brk.endpos = brk.pos + brk.str.length();
+ *cit_brk = brk;
+ dim_.wid = wid_brk + brk.dim.wid;
+ // If there are other elements, they should be removed.
+ elements_.erase(cit_brk + 1, end);
+ return true;
+ }
+ }
+
+ if (cit != beg && cit->type == VIRTUAL) {
+ // It is not possible to separate a virtual element from the
+ // previous one.
+ --cit;
+ wid -= cit->dim.wid;
}
- end_ = new_end;
- dim_.wid = new_wid;
- elements_.erase(elements_.begin() + i, elements_.end());
+
+ if (cit != beg) {
+ // There is no usable separator, but several elements have
+ // been added. We can cut right here.
+ end_ = cit->pos;
+ dim_.wid = wid;
+ elements_.erase(cit, end);
+ return true;
+ }
+
+ /* If we are here, it means that we have not found a separator to
+ * shorten the row. Let's try to break it again, but not at word
+ * boundary this time.
+ */
+ if (cit->breakAt(w - wid, true)) {
+ end_ = cit->endpos;
+ // See comment above.
+ cit->str = rtrim(cit->str);
+ cit->endpos = cit->pos + cit->str.length();
+ dim_.wid = wid + cit->dim.wid;
+ // If there are other elements, they should be removed.
+ elements_.erase(next(cit, 1), end);
+ return true;
+ }
+ return false;
}
pos_type const end = elements_.size();
while (i < end) {
// gather a sequence of elements with the same direction
- bool const rtl = elements_[i].font.isVisibleRightToLeft();
+ bool const rtl = elements_[i].isRTL();
pos_type j = i;
- while (j < end && elements_[j].font.isVisibleRightToLeft() == rtl)
+ while (j < end && elements_[j].isRTL() == rtl)
++j;
// if the direction is not the same as the paragraph
// direction, the sequence has to be reverted.
// If the paragraph itself is RTL, reverse everything
if (rtl_par)
reverse(elements_.begin(), elements_.end());
+ rtl_ = rtl_par;
+}
+
+Row::const_iterator const
+Row::findElement(pos_type const pos, bool const boundary, double & x) const
+{
+ /**
+ * When boundary is true, position i is in the row element (pos, endpos)
+ * if
+ * pos < i <= endpos
+ * whereas, when boundary is false, the test is
+ * pos <= i < endpos
+ * The correction below allows to handle both cases.
+ */
+ int const boundary_corr = (boundary && pos) ? -1 : 0;
+
+ x = left_margin;
+
+ /** Early return in trivial cases
+ * 1) the row is empty
+ * 2) the position is the left-most position of the row; there
+ * is a quirk here however: if the first element is virtual
+ * (end-of-par marker for example), then we have to look
+ * closer
+ */
+ if (empty()
+ || (pos == begin()->left_pos() && !boundary
+ && !begin()->isVirtual()))
+ return begin();
+
+ Row::const_iterator cit = begin();
+ for ( ; cit != end() ; ++cit) {
+ /** Look whether the cursor is inside the element's
+ * span. Note that it is necessary to take the
+ * boundary into account, and to accept virtual
+ * elements, which have pos == endpos.
+ */
+ if (pos + boundary_corr >= cit->pos
+ && (pos + boundary_corr < cit->endpos || cit->isVirtual())) {
+ x += cit->pos2x(pos);
+ break;
+ }
+ x += cit->full_width();
+ }
+
+ if (cit == end())
+ --cit;
+
+ return cit;
}
+
} // namespace lyx
projects / lyx.git / blobdiff