I cannot get the length of all the elements in my list because it contains Widgets. Is there a way I can get around this? I use

to generate the list with the element lengths.

I'm getting the following error: The element type 'List<Container>' can't be assigned to the list type 'Widget'.dartlist_element_type_not_assignable.

This is an example of the contents list I'm trying to get the length from:

I've tried list builder instead of list generator but this doesn't seem to make a difference.

CodePudding user response：

Add spread operator at the front if the List, and use the length on the List normally.

children: [
...List.generate(contents.length, (index) => buildDot(index, context)), // add ... like this in your List
],

this will lead that your list will be merged with the principal list.