<p>我找到了解决这个问题的办法。我不确定是否有更优雅的解决方案,但基本上问题归结为必须将回调函数公开给<code>global()</code>范围,然后使用<code>f()(g)</code>语法用API修饰器修饰它。你知道吗</p>
<p>因此,我编写了一个基类(<code>CallbackRegisterer</code>),它为任何派生类提供了<code>bindHandler()</code>方法—这个方法包装了一个函数,并为每个<code>CallbackRegisterer</code>实例提供了一个唯一的id(我同时打开了许多UI面板):</p>
<pre><code>class CallbackRegisterer(object):
__count = 0
@classmethod
def _instanceCounter(cls):
CallbackRegisterer.__count += 1
return CallbackRegisterer.__count
def __init__(self):
"""
Constructor
@param eq_instance 0=playback 1=record 2=sidetone.
"""
self._id = self._instanceCounter()
print "instantiating #%d instance of %s" % (self._id, self._getClassName())
def bindHandler(self, ui_element, callback, callback_args = [], handler_type = None,
initialize = False, forward_event_args = False, handler_id = None):
proxy = lambda *args: self._handlerProxy(callback, args, callback_args, forward_event_args)
handler_name = callback.__name__ + "_" + str(self._id)
if handler_id is not None:
handler_name += "_" + str(handler_id)
globals()[handler_name] = proxy
# print "handler_name: %s" % handler_name
handler_type(ui_element)(proxy)
if initialize:
proxy()
def _handlerProxy(self, callback, event_args, callback_args, forward_event_args):
try:
if forward_event_args:
new_args = [x for x in event_args]
new_args.extend(callback_args)
callback(*new_args)
else:
callback(*callback_args)
except:
print "exception in callback???"
self.log.exception('In event callback')
raise
def _getClassName(self):
return self.__class__.__name__
</code></pre>
<p>然后我可以从中派生一个类并传入回调,回调将使用API装饰器进行正确装饰:</p>
<pre><code>class Panel(CallbackRegisterer):
def __init__(self):
super(Panel, self).__init__()
# can bind from sub classes of Panel as well - different class name in handle_name
self.bindHandler(self.controls.test_button, self._testButtonCB, handler_type = valueChangeHandler)
# can bind multiple versions of same function for repeated ui elements, etc.
for idx in range(0, 10):
self.bindHandler(self.controls["check_box_"+str(idx)], self._testCheckBoxCB,
callback_args = [idx], handler_type = valueChangeHandler, handler_id = idx)
def _testCheckBoxCB(self, *args):
check_box_id = args[0]
print "in _testCheckBoxCB #%d" % check_box_id
def _testButtonCB(self):
"""
Handler for test button
"""
print "in _testButtonCB"
panel = Panel()
</code></pre>
<p>注意,我还可以从<code>Panel</code>派生出更多的子类,并且绑定在那里的任何回调都将基于类名字符串获得它们自己唯一的<code>handler_name</code>。你知道吗</p>