Flutter, how to use confirmDismiss in Dismissible?

Question

What I have:

Dismissible(
    key: Key(state.threads[index].toString()),
    onDismissed: (direction) {
        setState(() {
            state.threads.removeAt         


        

Answer 1

In the confirmDismiss attribute you can return an AlertDialog() (or whatever type of dialog you prefer) and then list the possible outcomes (e.g., delete and cancel) in buttons and return either true (delete) or false (cancel) which then determines if the item has to be removed or needs to stay in the list.

Example:

confirmDismiss: (DismissDirection direction) async {
  return await showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: const Text("Confirm"),
        content: const Text("Are you sure you wish to delete this item?"),
        actions: [
          FlatButton(
            onPressed: () => Navigator.of(context).pop(true),
            child: const Text("DELETE")
          ),
          FlatButton(
            onPressed: () => Navigator.of(context).pop(false),
            child: const Text("CANCEL"),
          ),
        ],
      );
    },
  );
},

You can extract the logic into a method to make the code more readable.