5491c8c146
This auto-formats all *.dart files in the repository outside of the `engine` subdirectory and enforces that these files stay formatted with a presubmit check. **Reviewers:** Please carefully review all the commits except for the one titled "formatted". The "formatted" commit was auto-generated by running `dev/tools/format.sh -a -f`. The other commits were hand-crafted to prepare the repo for the formatting change. I recommend reviewing the commits one-by-one via the "Commits" tab and avoiding Github's "Files changed" tab as it will likely slow down your browser because of the size of this PR. --------- Co-authored-by: Kate Lovett <katelovett@google.com> Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
96 lines
2.5 KiB
Dart
96 lines
2.5 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Snapshot from http://www.nasdaq.com/screening/company-list.aspx
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// Fetched 2/23/2014.
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// "Symbol","Name","LastSale","MarketCap","IPOyear","Sector","industry","Summary Quote",
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// Data in stock_data.json
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import 'dart:convert';
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import 'dart:math' as math;
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import 'package:flutter/foundation.dart';
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import 'package:http/http.dart' as http;
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final math.Random _rng = math.Random();
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class Stock {
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Stock(this.symbol, this.name, this.lastSale, this.marketCap, this.percentChange);
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Stock.fromFields(List<String> fields) {
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// TODO(jackson): This class should only have static data, not lastSale, etc.
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// "Symbol","Name","LastSale","MarketCap","IPOyear","Sector","industry","Summary Quote",
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lastSale = 0.0;
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try {
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lastSale = double.parse(fields[2]);
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} catch (_) {}
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symbol = fields[0];
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name = fields[1];
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marketCap = fields[4];
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percentChange = (_rng.nextDouble() * 20) - 10;
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}
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late String symbol;
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late String name;
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late double lastSale;
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late String marketCap;
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late double percentChange;
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}
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class StockData extends ChangeNotifier {
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StockData() {
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if (actuallyFetchData) {
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_httpClient = http.Client();
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_fetchNextChunk();
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}
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}
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final List<String> _symbols = <String>[];
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final Map<String, Stock> _stocks = <String, Stock>{};
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List<String> get allSymbols => _symbols;
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Stock? operator [](String symbol) => _stocks[symbol];
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bool get loading => _httpClient != null;
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void add(List<dynamic> data) {
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for (final List<dynamic> fields in data.cast<List<dynamic>>()) {
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final Stock stock = Stock.fromFields(fields.cast<String>());
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_symbols.add(stock.symbol);
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_stocks[stock.symbol] = stock;
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}
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_symbols.sort();
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notifyListeners();
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}
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static const int _chunkCount = 30;
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int _nextChunk = 0;
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Uri _urlToFetch(int chunk) =>
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Uri.https('domokit.github.io', 'examples/stocks/data/stock_data_$chunk.json');
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http.Client? _httpClient;
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static bool actuallyFetchData = true;
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void _fetchNextChunk() {
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_httpClient!.get(_urlToFetch(_nextChunk++)).then<void>((http.Response response) {
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final String json = response.body;
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const JsonDecoder decoder = JsonDecoder();
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add(decoder.convert(json) as List<dynamic>);
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if (_nextChunk < _chunkCount) {
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_fetchNextChunk();
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} else {
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_end();
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}
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});
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}
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void _end() {
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_httpClient!.close();
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_httpClient = null;
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}
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}
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