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class TimeNotification extends Notification {
  final String time;

  const TimeNotification({this.time});
}

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void preTranslate(Matrix4 leftMatrix, double x, double y) {
  if(x == 0 && y == 0) {
    return;
  }

  for (int i = 0; i < 4; ++i) {
    var value = leftMatrix.entry(0, i) * x + leftMatrix.entry(1, i) * y;
    value += leftMatrix.entry(2, i) + leftMatrix.entry(3, i);
    leftMatrix.setEntry( 3, i, value);
  }

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class _ContactListState extends State<ContactList> implements ContactListViewContract {

  // ...

  List<_ContactListItem> _buildContactList() {
    return _contacts.map((contact) =>
                          _ContactListItem (
                            contact: contact,
                            onTap: () { _showContactPage(context, contact); }
                          ))

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class ContactPage extends StatelessWidget {

  // ...
  
   _ContactCategory _buildPhoneCategory() {
    var phoneItems = _contact.phones.map((phone) =>
                        _ContactCategoryItem(
                          icon: Icons.message,
                          lines: <String>[phone.number, phone.type]
                        )).toList();

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class ContactPage extends StatelessWidget {

  static const String routeName = '/contact';

  final Contact _contact;

  ContactPage(this._contact);

  @override
  Widget build(BuildContext context) {

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class _ContactCategory extends StatelessWidget {

  final IconData icon;
  final List<_ContactCategoryItem> children;

  _ContactCategory({Key key, this.icon, this.children}): super(key: key);

  @override
  Widget build(BuildContext context) {
    final ThemeData themeData = Theme.of(context);

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class _ContactCategoryItem extends StatelessWidget {

  final IconData icon;
  final List<String> lines;

  _ContactCategoryItem({ Key key,  @required this.icon, @required this.lines })
    : super(key: key);

  @override
  Widget build(BuildContext context) {

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DecoratedBox(
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                      begin: const FractionalOffset(0.5, 0.6),
                      end: const FractionalOffset(0.5, 1.0),
                      colors: <Color>[const Color(0x00000000), const Color(0x70000000)]
                  )
                )
            )

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import 'package:flutter/material.dart';

class FlexibleAppBar extends SliverAppBar {
  static const double height = 256.0;

  FlexibleAppBar(String title, String imageUrl) : super(
    pinned: true,
    expandedHeight: height,
    flexibleSpace: FlexibleSpaceBar(
        title: Text(title),

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import 'dart:async';
import 'package:intl/intl.dart';


class Contact {

  static final DateFormat _formatter = DateFormat('MMMM d, yyyy');

  final String fullName;
  final String gender;