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60cf37471d
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15803 a592a061-630c-0410-9148-cb99ea01b6c8
192 lines
3.6 KiB
C
192 lines
3.6 KiB
C
/**
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* \file GuiFontMetrics.C
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author unknown
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* \author John Levon
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "GuiFontMetrics.h"
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#include "qt_helpers.h"
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#include "language.h"
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#include "support/unicode.h"
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using lyx::char_type;
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using lyx::docstring;
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using std::string;
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namespace lyx {
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namespace frontend {
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GuiFontMetrics::GuiFontMetrics(QFont const & font)
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: metrics_(font), smallcaps_metrics_(font), smallcaps_shape_(false)
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{
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#ifdef USE_LYX_FONTCACHE
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for (int i = 0; i != 65536; ++i)
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widthcache_[i] = -1;
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#endif
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}
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GuiFontMetrics::GuiFontMetrics(QFont const & font, QFont const & smallcaps_font)
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: metrics_(font), smallcaps_metrics_(smallcaps_font), smallcaps_shape_(true)
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{
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}
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int GuiFontMetrics::maxAscent() const
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{
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return metrics_.ascent();
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}
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int GuiFontMetrics::maxDescent() const
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{
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// We add 1 as the value returned by QT is different than X
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// See http://doc.trolltech.com/2.3/qfontmetrics.html#200b74
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return metrics_.descent() + 1;
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}
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int GuiFontMetrics::ascent(char_type c) const
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{
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QRect const & r = metrics_.boundingRect(ucs4_to_qchar(c));
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return -r.top();
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}
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int GuiFontMetrics::descent(char_type c) const
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{
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QRect const & r = metrics_.boundingRect(ucs4_to_qchar(c));
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return r.bottom() + 1;
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}
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int GuiFontMetrics::lbearing(char_type c) const
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{
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return metrics_.leftBearing(ucs4_to_qchar(c));
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}
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int GuiFontMetrics::rbearing(char_type c) const
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{
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// Qt rbearing is from the right edge of the char's width().
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QChar sc = ucs4_to_qchar(c);
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return metrics_.width(sc) - metrics_.rightBearing(sc);
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}
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int GuiFontMetrics::smallcapsWidth(QString const & s) const
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{
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int w = 0;
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int const ls = s.size();
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for (int i = 0; i < ls; ++i) {
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QChar const & c = s[i];
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QChar const uc = c.toUpper();
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if (c != uc)
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w += smallcaps_metrics_.width(uc);
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else
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w += metrics_.width(c);
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}
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return w;
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}
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int GuiFontMetrics::width(char_type const * s, size_t ls) const
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{
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// Caution: The following ucs4_to_something conversions work for
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// symbol fonts only because they are no real conversions but simple
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// casts in reality.
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if (ls == 1 && !smallcaps_shape_) {
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QChar const c = ucs4_to_qchar(s[0]);
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return width(c.unicode());
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}
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QString ucs2;
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ucs4_to_qstring(s, ls, ucs2);
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if (smallcaps_shape_)
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return smallcapsWidth(ucs2);
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int w = 0;
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for (unsigned int i = 0; i < ls; ++i)
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w += width(ucs2[i].unicode());
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return w;
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}
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int GuiFontMetrics::width(QString const & ucs2) const
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{
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int const ls = ucs2.size();
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if (ls == 1 && !smallcaps_shape_) {
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return width(ucs2[0].unicode());
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}
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if (smallcaps_shape_)
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return smallcapsWidth(ucs2);
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int w = 0;
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for (int i = 0; i < ls; ++i)
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w += width(ucs2[i].unicode());
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return w;
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}
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int GuiFontMetrics::signedWidth(docstring const & s) const
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{
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if (s.empty())
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return 0;
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if (s[0] == '-')
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return -width(&(s[1]), s.length() - 1);
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else
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return FontMetrics::width(s);
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}
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void GuiFontMetrics::rectText(docstring const & str,
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int & w, int & ascent, int & descent) const
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{
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static int const d = 2;
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w = FontMetrics::width(str) + d * 2 + 2;
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ascent = metrics_.ascent() + d;
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descent = metrics_.descent() + d;
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}
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void GuiFontMetrics::buttonText(docstring const & str,
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int & w, int & ascent, int & descent) const
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{
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static int const d = 3;
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w = FontMetrics::width(str) + d * 2 + 2;
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ascent = metrics_.ascent() + d;
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descent = metrics_.descent() + d;
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}
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#ifdef USE_LYX_FONTCACHE
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int GuiFontMetrics::width(unsigned short val) const
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{
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if (widthcache_[val] == -1)
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widthcache_[val] = metrics_.width(QChar(val));
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return widthcache_[val];
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}
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#endif
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}
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}
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