2 * \file GuiFontMetrics.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
9 * Full author contact details are available in file CREDITS.
14 #include "GuiFontMetrics.h"
16 #include "qt_helpers.h"
19 #include "Dimension.h"
21 #include "support/unicode.h"
28 GuiFontMetrics::GuiFontMetrics(QFont const & font)
29 : metrics_(font), smallcaps_metrics_(font), smallcaps_shape_(false)
34 GuiFontMetrics::GuiFontMetrics(QFont const & font, QFont const & smallcaps_font)
35 : metrics_(font), smallcaps_metrics_(smallcaps_font), smallcaps_shape_(true)
40 int GuiFontMetrics::maxAscent() const
42 return metrics_.ascent();
46 int GuiFontMetrics::maxDescent() const
48 // We add 1 as the value returned by QT is different than X
49 // See http://doc.trolltech.com/2.3/qfontmetrics.html#200b74
50 return metrics_.descent() + 1;
54 int GuiFontMetrics::lbearing(char_type c) const
57 // FIXME: QFontMetrics::leftBearingdoes not support the
58 // full unicode range. Once it does, we could use:
59 //return metrics_.leftBearing(toqstr(docstring(1,c)));
62 return metrics_.leftBearing(ucs4_to_qchar(c));
66 int GuiFontMetrics::rbearing(char_type c) const
68 if (!rbearing_cache_.contains(c)) {
69 // Qt rbearing is from the right edge of the char's width().
72 QChar sc = ucs4_to_qchar(c);
73 rb = width(c) - metrics_.rightBearing(sc);
75 // FIXME: QFontMetrics::leftBearingdoes not support the
76 // full unicode range. Once it does, we could use:
77 // metrics_.rightBearing(toqstr(docstring(1,c)));
80 rbearing_cache_.insert(c, rb);
82 return rbearing_cache_.value(c);
86 int GuiFontMetrics::smallcapsWidth(char_type c) const
88 // FIXME: Optimisation probably needed: we don't use the width cache.
90 QChar const qc = ucs4_to_qchar(c);
91 QChar const uc = qc.toUpper();
93 return smallcaps_metrics_.width(uc);
95 return metrics_.width(qc);
97 QString const s = toqstr(docstring(1,c));
98 QString const us = s.toUpper();
100 return smallcaps_metrics_.width(us);
102 return metrics_.width(s);
107 int GuiFontMetrics::width(docstring const & s) const
109 size_t ls = s.size();
111 for (unsigned int i = 0; i < ls; ++i)
118 int GuiFontMetrics::width(QString const & ucs2) const
120 return width(qstring_to_ucs4(ucs2));
124 int GuiFontMetrics::signedWidth(docstring const & s) const
130 return -width(s.substr(1, s.size() - 1));
136 void GuiFontMetrics::rectText(docstring const & str,
137 int & w, int & ascent, int & descent) const
139 static int const d = 2;
140 w = width(str) + d * 2 + 2;
141 ascent = metrics_.ascent() + d;
142 descent = metrics_.descent() + d;
147 void GuiFontMetrics::buttonText(docstring const & str,
148 int & w, int & ascent, int & descent) const
150 static int const d = 3;
151 w = width(str) + d * 2 + 2;
152 ascent = metrics_.ascent() + d;
153 descent = metrics_.descent() + d;
157 Dimension const GuiFontMetrics::defaultDimension() const
159 return Dimension(0, maxAscent(), maxDescent());
163 Dimension const GuiFontMetrics::dimension(char_type c) const
165 return Dimension(width(c), ascent(c), descent(c));
169 void GuiFontMetrics::fillMetricsCache(char_type c) const
173 r = metrics_.boundingRect(ucs4_to_qchar(c));
175 r = metrics_.boundingRect(toqstr(docstring(1,c)));
177 AscendDescend ad = { -r.top(), r.bottom() + 1};
178 // We could as well compute the width but this is not really
179 // needed for now as it is done directly in width() below.
180 metrics_cache_.insert(c, ad);
184 int GuiFontMetrics::width(char_type c) const
186 if (smallcaps_shape_)
187 return smallcapsWidth(c);
189 if (!width_cache_.contains(c)) {
191 width_cache_.insert(c, metrics_.width(ucs4_to_qchar(c)));
193 width_cache_.insert(c, metrics_.width(toqstr(docstring(1,c))));
196 return width_cache_.value(c);
200 int GuiFontMetrics::ascent(char_type c) const
202 if (!metrics_cache_.contains(c))
205 return metrics_cache_.value(c).ascent;
209 int GuiFontMetrics::descent(char_type c) const
211 if (!metrics_cache_.contains(c))
214 return metrics_cache_.value(c).descent;