如何在 flutter 中使用提供者 state 管理的可关闭小部件

Question

I am trying to add dismissible widget to delete item from the list of items . I am using to provider for state management. to delete the item I have done something like this in changeNotifier file.

task_data.dart

void deleteTask(Task task) {
    _tasks.remove(task);
    notifyListeners();
  }

task_list_view.dart

Here i am passing deleteTask to my Task_tile.dart

child: new TaskListTile(
                  taskTitle: taskData.tasks[index].name,
                  isChecked: taskData.tasks[index].isDone,

                  checkboxCallback: (checkboxState) {
                    taskData.updateTask(taskData.tasks[index]);
                  },
                  deleteCallback: (){
                    taskData.deleteTask(taskData.tasks[index]);
                  },
                ),

list_tile_view.dart

Here I add dismissible widget to execute my deleteCallback.

final Function deleteCallback;

  @override
  Widget build(BuildContext context) {
    return Dismissible(
      key: Key(taskTitle),
      onDismissed: (direction) {
        deleteCallback;  <-- Here i get error by idle saying avoid unecessary statement.
      },

I have no idea why this is comming. Any help would be great.

Answer 1

You need to execute your function.

@override
Widget build(BuildContext context) {
  return Dismissible(
    key: Key(taskTitle),
    onDismissed: (direction) {
      deleteCallback();
    },
  );
}