How to do it...

1. In the pubspec.yaml file, import the animations dependency:

dependencies:
  flutter:
    sdk: flutter
  animations: ^2.0.0

2. At the top of the dismissible.dart file, import the animations package:

import 'package:animations/animations.dart';

3. In the dismissible.dart file, in the itembuilder of the ListView, wrap the Dismissible widget into an OpenContainer widget, in its closedBuilder parameter, as shown here:

return OpenContainer(
  closedBuilder: (context, openContainer) {
    return Dismissible(
      key: Key(sweets[index]),
      child: ListTile(
        title: Text(sweets[index]),
        trailing: Icon(Icons.cake),
        onTap: () {
          openContainer();
        },
      ),
      onDismissed: (direction) {
        sweets.removeAt(index);
      },
    );
},);

4. At the top of the OpenContainer object, add a transitionDuration and a transitionType, as shown here:

transitionDuration: Duration(seconds...