英文:
How to prevent the pyqt button's clicked signal from sending Boolean value when slot functions have a decorator?
问题
我正在使用Qt Designer和PyQt5构建一个QT项目。我有一个按钮，它发送一个带有布尔值的信号。
绑定信号和函数的代码如下（我的装饰器在类内部，但装饰器不应该是问题，因为不管使用哪个装饰器，单击信号都会传递布尔参数）：
class Demo:def __init__(self):# 绑定信号和函数...self.ui.pushButton_disconnect.clicked.connect(self.robot.disconnect_devices)...def my_decorator(func):def wrapper(self, *args, **kwargs):# args和kwargs是必需的，因为其他装饰的函数有参数# 做一些操作return func(self, *args, **kwargs)return wrapper# 函数@my_decoratordef disconnect_devices(self, *args):print(args)# 做一些操作
现在我必须使用*args来接收False。我知道在connect中使用lambda也可以避免这个问题。
我已经找到了原因：我正在使用装饰器装饰函数disconnect_devices，似乎点击信号会自动传递参数，因为装饰器中使用了*args，所以我必须在我的函数中使用*args。有没有办法避免这个问题？或者我是否可以将clicked信号修复为不带参数的信号？
英文:
I am building a QT project with qt designer and pyqt5. I have one button that sends a signal with a boolean value.
My code to bind the signal and function(my decorator is inside the class, but it shouldn't be a problem with my decorator, because no matter what decorator is used, the clicked signal will pass in the bool parameter):
class Demo:def __init__(self):# bind the signal and function...self.ui.pushButton_disconnect.clicked.connect(self.robot.disconnect_devices)...def my_decorator(func):def wrapper(self,*args,**kwargs):'''args and kwargs is necessarybecause other decorated functions have parameters'''# do somethingreturn func(self,*args,**kwargs)retrun wrapper# function@my_decoratordef disconnect_devices(self, *args):print(args)# do something
Now I have to use *args to receive False. I know that using lambda in connect can also avoid this issue.
I have found the reason: I am using a decorator to decorate the function disconnect_devices, it seems that clicked signal will automatically pass in parameters because *args is used in the decorator, so I have to use *args to in my function. Is there a way to avoid this? Or can I fix the clicked signal as a signal without parameters?
答案1
得分: 1
你不能修改QAbstractButton::clicked信号的签名。
相反，你可以创建一个新的装饰器来包装原始的装饰器，像这样。
...def my_decorator(func):def wrapper(self, *args, **kwargs):return func(self, *args, **kwargs)return wrapperdef my_decorator_ignoring_args(func):return my_decorator(lambda self, *_: func(self))class Demo:...@my_decorator_ignoring_argsdef disconnect_devices(self):......
另外，你可以只定义一个装饰器，如果被装饰的函数没有参数，就包装它，像这样。
import inspect...def my_decorator(func):if len(inspect.signature(func).parameters) == 1:original_func = funcfunc = lambda self, *_: original_func(self)def wrapper(self, *args, **kwargs):return func(self, *args, **kwargs)return wrapperclass Demo:...@my_decoratordef disconnect_devices(self):...
英文:
You can't modify the signature of the QAbstractButton::clicked signal.
Instead, you can create a new decorator wrapping the original decorator like this.
...def my_decorator(func):def wrapper(self, *args, **kwargs):return func(self, *args, **kwargs)return wrapperdef my_decorator_ignoring_args(func):return my_decorator(lambda self, *_: func(self))class Demo:...@my_decorator_ignoring_argsdef disconnect_devices(self):......
Also, you can define only single decorator and wrap the decorated function if it has no parameters, like this.
import inspect...def my_decorator(func):if len(inspect.signature(func).parameters) == 1:original_func = funcfunc = lambda self, *_: original_func(self)def wrapper(self, *args, **kwargs):return func(self, *args, **kwargs)return wrapperclass Demo:...@my_decoratordef disconnect_devices(self):...
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