ControlMeta_Metabutton_with_class_props.py

class ControlMeta(type):
    '''
    Metaclass which creates CtlProperty  objects for Control classes
    '''
    CONTROL_ATTRIBS = ['annotation', 'backgroundColor', 'defineTemplate', 'docTag', 
                        'dragCallback', 'dropCallback', 'enable', 'enableBackground', 
                        'exists', 'fullPathName', 'height',  'manage', 'noBackground', 
                        'numberOfPopupMenus', 'parent', 'popupMenuArray', 'preventOverride', 
                        'useTemplate', 'visible', 'visibleChangeCommand', 'width']
    
    
    def __new__(cls, name, parents, kwargs):
        
        CMD = kwargs.get('CMD', None)
        _ATTRIBS = kwargs.get('_ATTRIBS',[])  # unique props from outer class
        
        if not kwargs.get('CMD'):
            CMD = parents[0].CMD
            
        for item in ControlMeta.CONTROL_ATTRIBS:
            kwargs[item] = CtlProperty(item, CMD)
    
        for item in _ATTRIBS:   # now add in the outer class's unique props too
            kwargs[item] = CtlProperty(item, CMD)

        return super(ControlMeta, cls).__new__(cls, name, parents, kwargs)
        

class MetaButton(object):
    CMD = cmds.button
    _ATTRIBS = ['label', 'command']  # button specific props
    __metaclass__ = ControlMeta
    
    def __init__(self, *args, **kwargs):
        self.Widget = self.CMD (*args, **kwargs)
        
class MetaFloatField(object):
    CMD = cmds.floatField
    _ATTRIBS = ['editable','precision','value','maxValue','step',
                'minValue', 'changeCommand','dragCommand','enterCommand',
                'receiveFocusCommand']  # this one has a lot of properties

    __metaclass__ = ControlMeta
    
    def __init__(self, *args, **kwargs):
        self.Widget = self.CMD (*args, **kwargs)