filechooser: set _handle_selection as attribute

plyer/platforms/android/filechooser.py

@@ -82,34 +82,19 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.select_code = randint(123456, 654321)
         self.selection = None
+        self._handle_selection = None
 
         # bind a function for a response from filechooser activity
         activity.bind(on_activity_result=self._on_activity_result)
 
-    @staticmethod
-    def _handle_selection(selection):
-        '''
-        Dummy placeholder for returning selection from
-        ``android.app.Activity.onActivityResult()``.
-
-        .. versionadded:: 1.4.0
-        '''
-        return selection
-
     def _open_file(self, **kwargs):
         '''
         Running Android Activity is non-blocking and the only call
         that blocks is onActivityResult running in GUI thread
 
         .. versionadded:: 1.4.0
         '''
-
-        # set up selection handler
-        # startActivityForResult is async
-        # onActivityResult is sync
-        self._handle_selection = kwargs.pop(
-            'on_selection', self._handle_selection
-        )
+        self._handle_selection = kwargs.pop("on_selection")
 
         # create Intent for opening
         file_intent = Intent(Intent.ACTION_GET_CONTENT)

plyer/platforms/linux/filechooser.py

@@ -40,21 +40,12 @@ class SubprocessFileChooser:
     show_hidden = False
 
     def __init__(self, *args, **kwargs):
-        self._handle_selection = kwargs.pop(
-            'on_selection', self._handle_selection
-        )
+        self._handle_selection = kwargs.pop("on_selection")
 
         # Simulate Kivy's behavior
         for i in kwargs:
             setattr(self, i, kwargs[i])
 
-    @staticmethod
-    def _handle_selection(selection):
-        '''
-        Dummy placeholder for returning selection from chooser.
-        '''
-        return selection
-
     _process = None
 
     def _run_command(self, cmd):

plyer/platforms/macosx/filechooser.py

@@ -38,21 +38,12 @@ class MacFileChooser:
     use_extensions = False
 
     def __init__(self, *args, **kwargs):
-        self._handle_selection = kwargs.pop(
-            'on_selection', self._handle_selection
-        )
+        self._handle_selection = kwargs.pop("on_selection")
 
         # Simulate Kivy's behavior
         for i in kwargs:
             setattr(self, i, kwargs[i])
 
-    @staticmethod
-    def _handle_selection(selection):
-        '''
-        Dummy placeholder for returning selection from chooser.
-        '''
-        return selection
-
     def run(self):
         panel = None
         if self.mode in ("open", "dir"):

plyer/platforms/win/filechooser.py

@@ -43,21 +43,12 @@ class Win32FileChooser:
     show_hidden = False
 
     def __init__(self, *args, **kwargs):
-        self._handle_selection = kwargs.pop(
-            'on_selection', self._handle_selection
-        )
+        self._handle_selection = kwargs.pop("on_selection")
 
         # Simulate Kivy's behavior
         for i in kwargs:
             setattr(self, i, kwargs[i])
 
-    @staticmethod
-    def _handle_selection(selection):
-        '''
-        Dummy placeholder for returning selection from chooser.
-        '''
-        return selection
-
     def run(self):
         self.selection = []
         try: