2 * \file GuiFontMetrics.C
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
56 return metrics_.leftBearing(ucs4_to_qchar(c));
60 int GuiFontMetrics::rbearing(char_type c) const
62 // Qt rbearing is from the right edge of the char's width().
63 QChar sc = ucs4_to_qchar(c);
64 return metrics_.width(sc) - metrics_.rightBearing(sc);
68 int GuiFontMetrics::smallcapsWidth(QString const & s) const
71 int const ls = s.size();
73 for (int i = 0; i < ls; ++i) {
74 QChar const & c = s[i];
75 QChar const uc = c.toUpper();
77 w += smallcaps_metrics_.width(uc);
79 w += metrics_.width(c);
85 int GuiFontMetrics::width(char_type const * s, size_t ls) const
87 // Caution: The following ucs4_to_something conversions work for
88 // symbol fonts only because they are no real conversions but simple
91 if (ls == 1 && !smallcaps_shape_) {
95 if (smallcaps_shape_) {
97 ucs4_to_qstring(s, ls, ucs2);
98 return smallcapsWidth(ucs2);
102 for (unsigned int i = 0; i < ls; ++i)
109 int GuiFontMetrics::width(QString const & ucs2) const
111 int const ls = ucs2.size();
112 if (ls == 1 && !smallcaps_shape_) {
113 return width(ucs2[0].unicode());
116 if (smallcaps_shape_)
117 return smallcapsWidth(ucs2);
120 for (int i = 0; i < ls; ++i)
121 w += width(ucs2[i].unicode());
127 int GuiFontMetrics::signedWidth(docstring const & s) const
133 return -width(&(s[1]), s.length() - 1);
135 return FontMetrics::width(s);
139 void GuiFontMetrics::rectText(docstring const & str,
140 int & w, int & ascent, int & descent) const
142 static int const d = 2;
143 w = FontMetrics::width(str) + d * 2 + 2;
144 ascent = metrics_.ascent() + d;
145 descent = metrics_.descent() + d;
150 void GuiFontMetrics::buttonText(docstring const & str,
151 int & w, int & ascent, int & descent) const
153 static int const d = 3;
154 w = FontMetrics::width(str) + d * 2 + 2;
155 ascent = metrics_.ascent() + d;
156 descent = metrics_.descent() + d;
160 Dimension const GuiFontMetrics::defaultDimension() const
162 return Dimension(0, maxAscent(), maxDescent());
166 Dimension const GuiFontMetrics::dimension(char_type c) const
168 return Dimension(width(c), ascent(c), descent(c));
172 void GuiFontMetrics::fillMetricsCache(char_type c) const
174 QRect const & r = metrics_.boundingRect(ucs4_to_qchar(c));
175 AscendDescend ad = { -r.top(), r.bottom() + 1};
176 // We could as well compute the width but this is not really
177 // needed for now as it is done directly in width() below.
178 metrics_cache_.insert(c, ad);
182 int GuiFontMetrics::width(char_type c) const
184 if (smallcaps_shape_)
185 return smallcapsWidth(ucs4_to_qchar(c));
187 if (!width_cache_.contains(c)) {
188 width_cache_.insert(c, metrics_.width(ucs4_to_qchar(c)));
191 return width_cache_.value(c);
195 int GuiFontMetrics::ascent(char_type c) const
197 if (!metrics_cache_.contains(c))
200 return metrics_cache_.value(c).ascent;
204 int GuiFontMetrics::descent(char_type c) const
206 if (!metrics_cache_.contains(c))
209 return metrics_cache_.value(c).descent;