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Issue 2989763002: Update charted to 0.4.8 and roll (Closed)
Patch Set: Removed Cutch from list of reviewers Created 3 years, 4 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 /**
6 * This provides a basic example of internationalization usage. It uses the
7 * local variant of all the facilities, meaning that libraries with the
8 * data for all the locales are directly imported by the program. Once lazy
9 * loading is available, we expect this to be the preferred mode, with
10 * the initialization code actually loading the specific libraries needed.
11 *
12 * This defines messages for an English locale directly in the program and
13 * has separate libraries that define German and Thai messages that say more or
14 * less the same thing, and prints the message with the date and time in it
15 * formatted appropriately for the locale.
16 */
17
18 library intl_basic_example;
19
20 import 'dart:async';
21 import 'package:intl/date_symbol_data_local.dart';
22 import 'package:intl/intl.dart';
23 import 'messages_all.dart';
24
25 /**
26 * In order to use this both as an example and as a test case, we pass in
27 * the function for what we're going to do with the output. For a simple
28 * example we just pass in [print] and for tests we pass in a function that
29 * adds it a list to be verified.
30 */
31 Function doThisWithTheOutput;
32
33 void setup(Function program, Function output) {
34 // Before we use any messages or use date formatting for a locale we must
35 // call their initializtion messages, which are asynchronous, since they
36 // might be reading information from files or over the web. Since we are
37 // running here in local mode they will all complete immediately.
38 doThisWithTheOutput = output;
39 var germanDatesFuture = initializeDateFormatting('de_DE', null);
40 var thaiDatesFuture = initializeDateFormatting('th_TH', null);
41 var germanMessagesFuture = initializeMessages('de_DE');
42 var thaiMessagesFuture = initializeMessages('th_TH');
43 Future
44 .wait([
45 germanDatesFuture,
46 thaiDatesFuture,
47 germanMessagesFuture,
48 thaiMessagesFuture
49 ])
50 .then(program);
51 }
52
53 // Because the initialization messages return futures we split out the main
54 // part of our program into a separate function that runs once all the
55 // futures have completed. We are passed the collection of futures, but we
56 // don't need to use them, so ignore the parameter.
57 runProgram(List<Future> _) {
58 var aDate = new DateTime.fromMillisecondsSinceEpoch(0, isUtc: true);
59 var de = new Intl('de_DE');
60 var th = new Intl('th_TH');
61 // This defines a message that can be internationalized. It is written as a
62 // function that returns the result of an Intl.message call. The primary
63 // parameter is a string that may use interpolation.
64 runAt(time, date) =>
65 Intl.message('Ran at $time on $date', name: 'runAt', args: [time, date]);
66 printForLocale(aDate, new Intl(), runAt);
67 printForLocale(aDate, de, runAt);
68 printForLocale(aDate, th, runAt);
69 // Example making use of the return value from withLocale;
70 var returnValue = Intl.withLocale(th.locale, () => runAt('now', 'today'));
71 doThisWithTheOutput(returnValue);
72 }
73
74 printForLocale(aDate, intl, operation) {
75 var hmsFormat = intl.date().add_Hms();
76 var dayFormat = intl.date().add_yMMMMEEEEd();
77 var time = hmsFormat.format(aDate);
78 var day = dayFormat.format(aDate);
79 Intl.withLocale(intl.locale, () => doThisWithTheOutput(operation(time, day)));
80 }
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