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Add a check for monospace font on Linux.

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This commit is contained in:
John Preston 2020-05-05 15:16:53 +04:00
parent 06eadc0caf
commit 8660904bc8
1 changed files with 33 additions and 16 deletions
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49
ui/style/style_core_font.cpp
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@ -85,25 +85,42 @@ bool LoadCustomFont(const QString &filePath, const QString &familyName, int flag
return ValidateFont(familyName, flags);
}
[[nodiscard]] QString SystemMonospaceFont() {
const auto type = QFontDatabase::FixedFont;
return QFontDatabase::systemFont(type).family();
}
[[nodiscard]] QString ManualMonospaceFont() {
const auto kTryFirst = std::initializer_list<QString>{
"Consolas",
"Liberation Mono",
"Menlo",
"Courier"
};
for (const auto &family : kTryFirst) {
const auto resolved = QFontInfo(QFont(family)).family();
if (!resolved.trimmed().compare(family, Qt::CaseInsensitive)) {
return family;
}
}
return QString();
}
QString MonospaceFont() {
static const auto family = [&]() -> QString {
#ifndef Q_OS_LINUX
const auto kTryFirst = std::initializer_list<QString>{
"Consolas",
"Liberation Mono",
"Menlo",
"Courier"
};
for (const auto &family : kTryFirst) {
const auto resolved = QFontInfo(QFont(family)).family();
if (!resolved.trimmed().compare(family, Qt::CaseInsensitive)) {
return family;
}
}
#endif // !Q_OS_LINUX
const auto manual = ManualMonospaceFont();
const auto system = SystemMonospaceFont();
const auto type = QFontDatabase::FixedFont;
return QFontDatabase::systemFont(type).family();
#if defined Q_OS_WIN || defined Q_OS_MAC
// Prefer our monospace font.
const auto useSystem = manual.isEmpty();
#else // Q_OS_WIN || Q_OS_MAC
// Prefer system monospace font.
const auto metrics = QFontMetrics(QFont(system));
const auto useSystem = manual.isEmpty()
|| (metrics.charWidth("i", 0) == metrics.charWidth("W", 0));
#endif // Q_OS_WIN || Q_OS_MAC
return useSystem ? system : manual;
}();
return family;