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Flutter - 101, Trees - Coggle Diagram

- - - - Stateful widget keeps , long life span: remain attached element tree even when the original widget gets replaced by a new one. (as long as the new one is the same type)
  - - - Pass data descendant. You can only replace an inheritedWidget's field by rebuilding the whole widget
      - Final only means it can't be reassigned. It does not mean it cannot change internally, you can attach a service (i.e) that can have its own internal state
- - - - Most of time, adding, removing, ordering collection of widgets in your widget state. (todo app, remove, add, order)
        
        If your entire subtree in your collection of widgets is stateless, keys aren't needed
    - - top of the widget subtree that you want preserve
        
        Flutter only looks for a key that matches a particular level of the tree
    - - collections: only different keys, too list: use text value as key, or use a id from db / uniquekey, dont use a random number
        
        Global keys
        
        allow widgets to change parents anywhere in your app without using a state
        
        they can be used ti access information about another widget in a complete different part of the widget tree
        
        local keys
        
        scroll location