浓缩pyqtproperties

有很多方法可以做到：类装饰器，元类和Mixin。

常用助手功能：

def set_pyqtproperties(klass, properties, proxy='user'):    def make_prop(prop):     def property_(self): return getattr(getattr(self, proxy), 'get_' + prop)        property_.__name__ = prop        return property_    if isinstance(properties, basestring):       properties = properties.split()    for prop in properties:         setattr(klass, prop, pyqtProperty(QVariant, make_prop(prop)))

类装饰器

def set_properties(properties):    def decorator(klass):        set_pyqtproperties(klass, properties)        return klass    return decorator

用法

@set_properties("display background")class LightDMUser(QObject): pass

如果不支持类装饰器，则可以尝试：

class LightDMUser(QObject):     passLightDMUser = set_properties("display background")(LightDMUser)

元类

def set_properties_meta(properties):    def meta(name, bases, attrs):        cls = type(name, bases, attrs)        set_pyqtproperties(cls, properties)        return cls    return meta

用法

class LightDMUser(QObject):    __metaclass__ =  set_properties_meta("display background")

注意：如果将属性列表设置为类属性，则可以重用同一元类：

def metaClass(name, bases, attrs):    cls = type(name, bases, attrs)    set_pyqtproperties(cls, attrs.get('properties', ''))    return clsclass LightDMUser(QObject):    properties = "display background"    __metaclass__ = metaClass

另外，您可以

attrs

attrs[name] = value

type()

setattr(cls, name,value)

以上假设

QObject.__class__ is type

混合蛋白

def properties_mixin(classname, properties):    #note: create a new class by whatever means necessary    # e.g., even using exec() as namedtuple does    # http://hg.python.org/cpython/file/3.2/Lib/collections.py#l235    # reuse class decorator here    return set_properties(properties)(type(classname, (), {}))

用法

PropertiesMixin = properties_mixin('PropertiesMixin', 'display background')class LightDMUser(PropertiesMixin, QObject): pass

我还没有尝试过。这里的代码显示了实现该功能可能需要的数量和代码种类。