3.3 Qt/Lua types conversion
This section is about data types conversion between lua and Qt.
3.3.1 QtLua::Value types conversion
Lua values are exposed to Qt by Value objects in C++ code. A Value object can be converted to or get constructed from an equivalent C++ value:
3.3.2 Qt meta types conversion
Types commonly used by the Qt meta object system are automatically converted to and from lua values when needed. It occurs on slot invocation for arguments and return values, on Qt enums and properties values reading and writing, on lua function invocation from a Qt Signal...
The following table shows how types get converted:
| Lua type | Qt meta type id |
|---|---|
| boolean | QMetaType::Bool |
| number | QMetaType::Int |
| number | QMetaType::UInt |
| number | QMetaType::Long |
| number | QMetaType::LongLong |
| number | QMetaType::Short |
| number | QMetaType::Char |
| number | QMetaType::ULong |
| number | QMetaType::ULongLong |
| number | QMetaType::UShort |
| number | QMetaType::UChar |
| number | QMetaType::Double |
| number | QMetaType::Float |
| number | QMetaType::QChar |
| string | QMetaType::QString |
| string | QMetaType::QByteArray |
| table of strings indexed from 1 | QMetaType::QStringList |
| userdata (see QObject wrapping) | QMetaType::QObjectStar |
| userdata (see QObject wrapping) | QMetaType::QWidgetStar |
| table with width and height fields | QMetaType::QSize |
| table with width and height fields | QMetaType::QSizeF |
| table with x and y fields | QMetaType::QPoint |
| table with x and y fields | QMetaType::QPointF |
| table with x, y, width and height fields | QMetaType::QRect |
| table with x, y, width and height fields | QMetaType::QRectF |
| table with red, green and blue values | QMetaType::QColor |
| image file name string | QMetaType::QIcon |
| userdata (see UserData) | Ref pointer to UserData type. Qt meta type name is "QtLua::UserData::ptr" . |
| nil | Not handled Qt meta types |
The MetaType class enables registration of user defined handlers to handle other types. Other types can be user defined types or not yet handled Qt meta types.