elplaso/implicitly_animated_list

A Flutter widget that implicitly animates a list whenever it rebuilds with new items.

Often, your lists represent some kind of data.

You can just pass the original list data to the ImplicitlyAnimatedList as well as an itemBuilder for building a widget from one data point and it'll animate whenever the data changes:

ImplicitlyAnimatedList(
  // When you change items of this list and hot reload, the list animates. 
  itemData: [1, 2, 3, 4],
  itemBuilder: (_, number) => ListTile(title: Text('$number')),
),

It works with all classes and works well with StreamBuilder:

class User {
  String firstName;
  String lastName;

  // The ImplicitlyAnimatedList uses the == operator to compare items.
  bool operator== (Object other) => other is User
    && firstName == other.firstName
    && lastName == other.lastName;
}

...

StreamBuilder<List<User>>(
  stream: someSource.usersStream,
  builder: (context, snapshot) {
    if (!snapshot.hasData) {
      return ...;
    }
    return ImplicitlyAnimatedList(
      itemData: snapshot.data,
      itemBuilder: (context, user) {
        return ListTile(title: Text('${user.firstName} ${user.lastName}'));
      }
    );
  }
),

Here's an example that generates random numbers and animates from one state to the next (notice it's only 10 fps because of being a gif):