Is it possible to pick out an item from a list of widget's based on the widget's value in dart / flutter?

Question

I have a list of PopupMenuItem<T> as part of showMenu and I need to access the key for any given item when its clicked. When you click on an item, the showMenu will give you the selected value.

So I first gave each PopupMenuItem a key, which is part of a List:

[
   PopupMenuItem<int>-[<'Small'>], 
   PopupMenuItem<int>-[<'Medium'>], 
   PopupMenuItem<int>-[<'Large'>]
]

OR put another way:

            items: [
                PopupMenuItem<int>(
                  key: ValueKey('Small'),
                  value: 10,
                  child: Text('10'),
                ),
                PopupMenuItem<int>(
                  key: ValueKey('Medium'),
                  value: 20,
                  child: Text('20'),
                ),
                PopupMenuItem<int>(
                  key: ValueKey('Large'),
                  value: 30,
                  child: Text('30'),
                ),
            ],

Now when you tap on an item, or select an item you get returned the value of that item, which is great, but I want to get access to the key, which is the Small, Medium and Large listed above.

So is there a way to dive into a given list and get the item based on its value. If I have the item or at least its position in the list I can then get the key by doing :

((items[1].key) as ValueKey<String>).value.toString(); 

/// 1 represents the position in the list.  
///That is what I need to try to get, or just get the whole item somehow

Answer 1

I would suggest using UniqueKey() for the key. You can build a simple solution for your use case.

You can have a map to store the values with the respective strings.

Map<int,String> data ={10, 'Small', 20: 'Medium', 30: 'Large' }

Once you get the value from the tap, you pass the value to the map to get the respective string:

e.g. data[value]

simple and fast