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1) Merge input example into widgets example 2) Move single-file, non-fn examples into a "raw" directory 3) Rename stocks-fn and widgets-fn to stocks and widgets R=ojan@chromium.org Review URL: https://codereview.chromium.org/1005393006
74 lines
1.9 KiB
Dart
74 lines
1.9 KiB
Dart
// Copyright 2014 The Chromium 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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import 'dart:convert';
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import 'dart:math';
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import 'package:sky/framework/debug/tracing.dart';
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import 'package:sky/framework/net/fetch.dart';
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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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final Random _rng = new Random();
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class Stock {
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String symbol;
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String name;
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double lastSale;
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String marketCap;
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double percentChange;
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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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// FIXME: 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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}
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class StockData {
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List<List<String>> _data;
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StockData(this._data);
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void appendTo(List<Stock> stocks) {
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for (List<String> fields in _data)
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stocks.add(new Stock.fromFields(fields));
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}
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}
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typedef void StockDataCallback(StockData data);
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const _kChunkCount = 30;
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class StockDataFetcher {
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int _currentChunk = 0;
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final StockDataCallback callback;
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StockDataFetcher(this.callback) {
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_fetchNextChunk();
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}
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void _fetchNextChunk() {
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fetch('data/stock_data_${_currentChunk++}.json').then((Response response) {
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String json = response.bodyAsString();
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JsonDecoder decoder = new JsonDecoder();
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callback(new StockData(decoder.convert(json)));
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if (_currentChunk < _kChunkCount)
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_fetchNextChunk();
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});
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}
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}
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