[Question] What is the use of the key field, can it replace ft.Ref

[Alan3344]

Question

def topLeftLayout(self):
    """letfColumn layout"""
    return ft.Column(
        controls=[
            ft.ElevatedButton(
                ref=func.get('ref', None),
                key=func.get("key", None),
                text=func.get("label", None),
                tooltip=func.get("tooltip", None),
                on_click=getattr(self, func.get('handle', 'on_default')),
            ) for func in Ref.funcDef
        ],
        ref=Ref.leftColumn,
        key='leftColumn',
    )

I want to use it like this, but he reports an error

self.page['leftColumn'].height = 200

# Or keys, variables like
self.page.keys['leftColumn'].height = 200

It is cumbersome to declare a lot of Ref variables, especially for dynamically added controls

Code sample

No response

Error message

Exception in thread Thread-34 (__sync_handler):
Traceback (most recent call last):
  File "/opt/homebrew/Cellar/python@3.10/3.10.12_1/Frameworks/Python.framework/Versions/3.10/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/opt/homebrew/Cellar/python@3.10/3.10.12_1/Frameworks/Python.framework/Versions/3.10/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/homebrew/lib/python3.10/site-packages/flet_core/event_handler.py", line 30, in __sync_handler
    h(e)
  File "~/gui/event.py", line 90, in on_resize
    print(self.page['leftColumn'])
TypeError: 'Page' object is not subscriptable

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• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

Key is used only for scrolling purposes . More on it here.