pagetronic

import 'dart:math';
import 'dart:typed_data';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';

class ColorPicker extends StatefulWidget {
  final ValueNotifier<Color?> color;

  const ColorPicker({super.key, required this.color});

pagetronic

import 'dart:async';

import 'package:flutter/widgets.dart';

class FutureOrBuilder<T> extends StatelessWidget {
  final FutureOr<T?> future;
  final Widget Function(BuildContext context, AsyncSnapshot<T?> snapshot) builder;

  const FutureOrBuilder({super.key, required this.builder, required this.future});

pagetronic

import 'dart:async';

class Deferrer {
  final int milliseconds;
  Future? _next;

  Deferrer(this.milliseconds);

  void defer(void Function() toDo) {
    Future? next_;