mjohnsullivan’s gists

mjohnsullivan / bouncy_truck.dart

Created June 18, 2021 21:54

An example of mixing and controlling multiple animations in Rive

	import 'package:flutter/material.dart';
	import 'package:rive/rive.dart';

	void main() => runApp(MaterialApp(
	home: BouncyTruckAnimation(),
	));

	class BouncyTruckAnimation extends StatefulWidget {
	const BouncyTruckAnimation({Key? key}) : super(key: key);

mjohnsullivan / compute_drag_target_in_virtualized_list.dart

Created July 9, 2020 19:19

	void determineDragPosition(BuildContext itemContext,
	DragUpdateDetails details, Item draggedItem, double itemHeight) {
	_dragOperation.offset.value = details.globalPosition;

	// Find the fixed extent list renderer.
	RenderSliverFixedExtentList extentList;
	for (var p = itemContext.findRenderObject();
	p != null;
	p = p is RenderObject ? p.parent as RenderObject : null) {
	if (p is RenderSliverFixedExtentList) {

mjohnsullivan / keep_alive.dart

Created July 8, 2020 01:47

	import 'package:flutter/material.dart';

	void main() => runApp(KeepAliveExampleApp());

	class KeepAliveExampleApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	title: 'Flutter Demo',
	home: Scaffold(

mjohnsullivan / streams_with_async.dart

Created December 3, 2019 17:55

Example of how to transform streams of data in Dart/Flutter when the transform involves asynchronous calls.

	import 'dart:async';
	import 'dart:math' show Random;

	final random = Random();

	// Mock data for a list of messages
	const messageList = [
	{
	'message': 'Message 1',
	'timestamp': 1,

mjohnsullivan / border_icon_button.dart

Created December 1, 2019 21:39

A Flutter button comprising a raised icon with a border and some text

	import 'package:flutter/material.dart';

	void main() => runApp(MyApp());

	class MyApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	home: Scaffold(
	backgroundColor: Colors.lightBlue,

mjohnsullivan / curved_appbar.dart

Created November 28, 2019 19:59

A curved Flutter AppBar where widgets scroll nicely beneath the curved portion

	import 'package:flutter/material.dart';

	void main() => runApp(
	MaterialApp(home: MyHomePage()),
	);

	class MyHomePage extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	const curveHeight = 50.0;

mjohnsullivan / draggable_custom_painter.dart

Created November 26, 2019 21:32

Handling draggable areas or elements drawn on a Flutter CustomPainter

	import 'package:flutter/material.dart';

	void main() => runApp(MyApp());

	class MyApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	title: 'Draggable Custom Painter',
	home: Scaffold(

mjohnsullivan / icon_gradient.dart

Created November 25, 2019 22:09

Apply a color gradient to an icon in Flutter

	import 'package:flutter/material.dart';

	void main() => runApp(MyApp());

	class MyApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	home: Scaffold(
	body: Center(

mjohnsullivan / rubber_range_picker.dart

Created March 22, 2019 00:19 — forked from slightfoot/rubber_range_picker.dart

Rubber Range Picker - Based on https://dribbble.com/shots/6101178-Rubber-Range-Picker-Open-Source by Cuberto - 14th March 2019

	import 'dart:math' as math;

	import 'package:flutter/material.dart';
	import 'package:flutter/rendering.dart';
	import 'package:flutter/scheduler.dart';

	void main() => runApp(ExampleApp());

	class ExampleApp extends StatelessWidget {
	@override

mjohnsullivan / smiley.dart

Created February 5, 2019 23:30

A custom painter that draws a smiley face in Flutter

	// Copyright 2019 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'package:flutter/material.dart';

	import 'dart:math' as Math;

	void main() => runApp(MyApp());

Matt Sullivan mjohnsullivan