99 lines
3.5 KiB
Python
99 lines
3.5 KiB
Python
"""
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Python <-> Objective-C bridge (PyObjC)
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This module defines the core interfaces of the Python<->Objective-C bridge.
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"""
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__all__ = ['IBOutlet', 'IBAction', 'accessor', 'Accessor', 'typedAccessor']
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from _objc import ivar, selector
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#
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# Interface builder support.
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#
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def IBOutlet(name):
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"""
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Create an instance variable that can be used as an outlet in
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Interface Builder.
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"""
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return ivar(name, isOutlet=1)
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def IBAction(func):
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"""
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Return an Objective-C method object that can be used as an action
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in Interface Builder.
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"""
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return selector(func, signature="v@:@")
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def accessor(func, typeSignature='@'):
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"""
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Return an Objective-C method object that is conformant with key-value coding
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and key-value observing.
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"""
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from inspect import getargspec
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args, varargs, varkw, defaults = getargspec(func)
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funcName = func.__name__
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maxArgs = len(args)
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minArgs = maxArgs - len(defaults or ())
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# implicit self
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selArgs = 1 + funcName.count('_')
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if varargs is not None or varkw is not None:
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raise TypeError('%s can not be an accessor because it accepts varargs or varkw' % (funcName,))
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if not (minArgs <= selArgs <= maxArgs):
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if selArgs == 3 and (minArgs <= 2 <= maxArgs) and funcName.startswith('validate') and funcName.endswith('_error_'):
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return selector(func, signature='c@:N^@o^@')
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elif minArgs == maxArgs:
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raise TypeError('%s expected to take %d args, but must accept %d from Objective-C (implicit self plus count of underscores)' % (funcName, maxArgs, selArgs))
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else:
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raise TypeError('%s expected to take between %d and %d args, but must accept %d from Objective-C (implicit self plus count of underscores)' % (funcName, minArgs, maxArgs, selArgs))
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if selArgs == 3:
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if funcName.startswith('insertObject_in') and funcName.endswith('AtIndex_'):
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return selector(func, signature='v@:@i')
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elif funcName.startswith('replaceObjectIn') and funcName.endswith('AtIndex_withObject_'):
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return selector(func, signature='v@:i@')
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# pass through to "too many arguments"
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elif selArgs == 2:
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if funcName.startswith('objectIn') and funcName.endswith('AtIndex_'):
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return selector(func, signature='@@:i')
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elif funcName.startswith('removeObjectFrom') and funcName.endswith('AtIndex_'):
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return selector(func, signature='v@:i')
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elif funcName.startswith('get') and funcName.endswith('_range_'):
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return selector(func, signature='@@:{_NSRange=ii}')
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return selector(func, signature="v@:" + typeSignature)
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elif selArgs == 1:
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if typeSignature == '@' and func.func_name.startswith('countOf'):
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typeSignature = 'i'
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return selector(func, signature=typeSignature + "@:")
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raise TypeError("%s takes too many arguments to be an accessor" % (funcName,))
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def typedAccessor(typeSignature):
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"""
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Python 2.4 decorator for creating a typed accessor, usage:
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@typedAccessor('i')
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def someIntegerAccessor(self):
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return self.someInteger
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@typedAccessor('i')
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def setSomeIntegerAccessor_(self, anInteger):
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self.someInteger = anInteger
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"""
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def _typedAccessor(func):
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return accessor(func, typeSignature)
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return _typedAccessor
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def Accessor(func):
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import warnings
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warnings.warn(
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"Use objc.accessor instead of objc.Accessor", DeprecationWarning)
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return accessor(func)
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