WSJT-X/qt_helpers.hpp
2020-09-18 21:12:53 +01:00

137 lines
3.9 KiB
C++

#ifndef QT_HELPERS_HPP_
#define QT_HELPERS_HPP_
#include <stdexcept>
#include <ostream>
#include <QString>
#include <QChar>
#include <QMetaObject>
#include <QHostAddress>
#include <QDataStream>
#include <QMetaType>
#include <QMetaEnum>
#define ENUM_QDATASTREAM_OPS_DECL(CLASS, ENUM) \
QDataStream& operator << (QDataStream&, CLASS::ENUM const&); \
QDataStream& operator >> (QDataStream&, CLASS::ENUM&);
#define ENUM_QDATASTREAM_OPS_IMPL(CLASS, ENUM) \
QDataStream& operator << (QDataStream& os, CLASS::ENUM const& v) \
{ \
auto const& mo = CLASS::staticMetaObject; \
return os << mo.enumerator (mo.indexOfEnumerator (#ENUM)).valueToKey (static_cast<int> (v)); \
} \
\
QDataStream& operator >> (QDataStream& is, CLASS::ENUM& v) \
{ \
char * buffer; \
is >> buffer; \
bool ok {false}; \
auto const& mo = CLASS::staticMetaObject; \
auto const& me = mo.enumerator (mo.indexOfEnumerator (#ENUM)); \
if (buffer) \
{ \
v = static_cast<CLASS::ENUM> (me.keyToValue (buffer, &ok)); \
delete [] buffer; \
} \
if (!ok) \
{ \
v = static_cast<CLASS::ENUM> (me.value (0)); \
} \
return is; \
}
#define ENUM_CONVERSION_OPS_DECL(CLASS, ENUM) \
QString enum_to_qstring (CLASS::ENUM const&);
#define ENUM_CONVERSION_OPS_IMPL(CLASS, ENUM) \
QString enum_to_qstring (CLASS::ENUM const& m) \
{ \
auto const& mo = CLASS::staticMetaObject; \
return QString {mo.enumerator (mo.indexOfEnumerator (#ENUM)).valueToKey (static_cast<int> (m))}; \
}
#if QT_VERSION >= QT_VERSION_CHECK (5, 15, 0)
Qt::SplitBehaviorFlags const SkipEmptyParts = Qt::SkipEmptyParts;
#else
QString::SplitBehavior const SkipEmptyParts = QString::SkipEmptyParts;
#endif
inline
std::ostream& operator << (std::ostream& os, QByteArray const& b)
{
return os << b.constData ();
}
inline
std::ostream& operator << (std::ostream& os, QString const& s)
{
return os << s.toStdString ();
}
inline
void throw_qstring (QString const& qs)
{
throw std::runtime_error {qs.toLocal8Bit ().constData ()};
}
QString font_as_stylesheet (QFont const&);
// do what is necessary to change a dynamic property and trigger any
// conditional style sheet updates
void update_dynamic_property (QWidget *, char const * property, QVariant const& value);
// round a QDateTime instance to an integral interval of milliseconds
QDateTime qt_round_date_time_to (QDateTime dt, int milliseconds);
// truncate a QDateTime to an integral interval of milliseconds
QDateTime qt_truncate_date_time_to (QDateTime dt, int milliseconds);
template <class T>
class VPtr
{
public:
static T * asPtr (QVariant v)
{
return reinterpret_cast<T *> (v.value<void *> ());
}
static QVariant asQVariant(T * ptr)
{
return QVariant::fromValue (reinterpret_cast<void *> (ptr));
}
};
#if QT_VERSION < QT_VERSION_CHECK (5, 14, 0)
// The Qt devs "fixed" this in 5.14 to specialize to use their own
// qHash(), it doesn't fix the problem we were addressing as qHash()
// returns a uint so is still a poorly distributed 32-bit value on
// 64-bit platforms, but we can't specialize ourselves as Qt already
// has - sigh.
namespace std
{
// std::hash<> specialization for QString based on the dbj2
// algorithm http://www.cse.yorku.ca/~oz/hash.html because qHash()
// is poor on 64-bit platforms due to being a 32-bit hash value
template<>
struct hash<QString>
{
std::size_t operator () (QString const& s) const noexcept
{
std::size_t hash {5381};
for (int i = 0; i < s.size (); ++i)
{
hash = ((hash << 5) + hash) + ((s.at (i).row () << 8) | s.at (i).cell ());
}
return hash;
}
};
}
#endif
// Register some useful Qt types with QMetaType
Q_DECLARE_METATYPE (QHostAddress);
#endif