filechooser: set _handle_selection as attribute #570
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_handle_selection was defined as a placeholder for returning the
selection from the activity result. It was used as a fallback when
"on_selection" was not provided.
There is a side effect by doing this: when "on_selection" is not
defined, the self._handle_selection attribute overwrites the
_handle_selection method. As an example, the following code will print
"True", which is practically the same thing that kwargs.pop() does if
the second argument provided to it is None:
```
def _handle_selection(selection):
return selection
kwargs = {}
_handle_selection = kwargs.pop("on_selection", _handle_selection)
print(_handle_selection is None)
```
The reason I'm not using the second argument of kwargs.pop() as None in
this commit is because I think it's correct to raise a KeyError when
"on_selection" is not defined. Given that this is a file chooser
implementation, it's necessary to have a callback when a file is chosen
by the user, otherwise an error should be raised.
The solution is to let _handle_selection as an attribute and remove the
static method. This way _handle_selection is not overwritten and a
KeyError exception is be raised if "on_selection" is not provided.
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_handle_selectionwas defined as a placeholder for returning theselection from the activity result. It was used as a fallback when
on_selectionwas not provided.There's a side effect by doing this: when
on_selectionis not defined,the
self._handle_selectionattribute overwrites the_handle_selectionmethod. Given that this is a file chooserimplementation, I think it's necessary to have a callback when a file is
chosen by the user. With the current implementation, if the user does
not pass an
on_selectioncallback, no error is raised.The solution is to let
_handle_selectionas an attribute and removethe static method. This way it is not overwritten and a
KeyErrorexception is raised if
on_selectionis not provided.