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https://github.com/flutter/samples.git
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Update web/ samples to work with Flutter SDK (#134)
* add package:http dependency in dad_jokes * add package:http dependency in filipino_cuisine * don't build package:http demos until flutter/flutter#34858 is resolved * update gallery * update github_dataviz * update particle_background * don't build github_dataviz (uses package:http) * update slide_puzzle * update spinning_square * update timeflow * update vision_challenge * update charts * update dad_jokes * update filipino cuisine * ignore build output * update timeflow and vision_challenge * update slide_puzzle * don't commit build/ directory * move preview.png images to assets * fix path url join * update readme * update web/readme.md
This commit is contained in:
John Ryan
GitHub
201
web/charts/lib/behaviors/selection_callback_example.dart
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201
web/charts/lib/behaviors/selection_callback_example.dart
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// Copyright 2018 the Charts project authors. Please see the AUTHORS file
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// for details.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/// Timeseries chart with example of updating external state based on selection.
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///
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/// A SelectionModelConfig can be provided for each of the different
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/// [SelectionModel] (currently info and action).
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///
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/// [SelectionModelType.info] is the default selection chart exploration type
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/// initiated by some tap event. This is a different model from
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/// [SelectionModelType.action] which is typically used to select some value as
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/// an input to some other UI component. This allows dual state of exploring
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/// and selecting data via different touch events.
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///
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/// See [SelectNearest] behavior on setting the different ways of triggering
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/// [SelectionModel] updates from hover & click events.
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// EXCLUDE_FROM_GALLERY_DOCS_START
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import 'dart:math';
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// EXCLUDE_FROM_GALLERY_DOCS_END
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import 'package:charts_flutter/flutter.dart' as charts;
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import 'package:flutter/material.dart';
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class SelectionCallbackExample extends StatefulWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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SelectionCallbackExample(this.seriesList, {this.animate});
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/// Creates a [charts.TimeSeriesChart] with sample data and no transition.
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factory SelectionCallbackExample.withSampleData() {
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return new SelectionCallbackExample(
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_createSampleData(),
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// Disable animations for image tests.
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animate: false,
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);
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}
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// EXCLUDE_FROM_GALLERY_DOCS_START
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// This section is excluded from being copied to the gallery.
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// It is used for creating random series data to demonstrate animation in
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// the example app only.
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factory SelectionCallbackExample.withRandomData() {
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return new SelectionCallbackExample(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<TimeSeriesSales, DateTime>> _createRandomData() {
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final random = new Random();
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final us_data = [
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new TimeSeriesSales(new DateTime(2017, 9, 19), random.nextInt(100)),
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new TimeSeriesSales(new DateTime(2017, 9, 26), random.nextInt(100)),
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new TimeSeriesSales(new DateTime(2017, 10, 3), random.nextInt(100)),
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new TimeSeriesSales(new DateTime(2017, 10, 10), random.nextInt(100)),
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];
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final uk_data = [
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new TimeSeriesSales(new DateTime(2017, 9, 19), random.nextInt(100)),
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new TimeSeriesSales(new DateTime(2017, 9, 26), random.nextInt(100)),
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new TimeSeriesSales(new DateTime(2017, 10, 3), random.nextInt(100)),
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new TimeSeriesSales(new DateTime(2017, 10, 10), random.nextInt(100)),
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];
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return [
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new charts.Series<TimeSeriesSales, DateTime>(
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id: 'US Sales',
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domainFn: (TimeSeriesSales sales, _) => sales.time,
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measureFn: (TimeSeriesSales sales, _) => sales.sales,
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data: us_data,
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),
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new charts.Series<TimeSeriesSales, DateTime>(
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id: 'UK Sales',
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domainFn: (TimeSeriesSales sales, _) => sales.time,
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measureFn: (TimeSeriesSales sales, _) => sales.sales,
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data: uk_data,
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)
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];
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}
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// EXCLUDE_FROM_GALLERY_DOCS_END
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// We need a Stateful widget to build the selection details with the current
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// selection as the state.
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@override
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State<StatefulWidget> createState() => new _SelectionCallbackState();
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/// Create one series with sample hard coded data.
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static List<charts.Series<TimeSeriesSales, DateTime>> _createSampleData() {
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final us_data = [
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new TimeSeriesSales(new DateTime(2017, 9, 19), 5),
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new TimeSeriesSales(new DateTime(2017, 9, 26), 25),
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new TimeSeriesSales(new DateTime(2017, 10, 3), 78),
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new TimeSeriesSales(new DateTime(2017, 10, 10), 54),
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];
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final uk_data = [
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new TimeSeriesSales(new DateTime(2017, 9, 19), 15),
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new TimeSeriesSales(new DateTime(2017, 9, 26), 33),
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new TimeSeriesSales(new DateTime(2017, 10, 3), 68),
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new TimeSeriesSales(new DateTime(2017, 10, 10), 48),
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];
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return [
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new charts.Series<TimeSeriesSales, DateTime>(
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id: 'US Sales',
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domainFn: (TimeSeriesSales sales, _) => sales.time,
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measureFn: (TimeSeriesSales sales, _) => sales.sales,
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data: us_data,
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),
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new charts.Series<TimeSeriesSales, DateTime>(
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id: 'UK Sales',
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domainFn: (TimeSeriesSales sales, _) => sales.time,
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measureFn: (TimeSeriesSales sales, _) => sales.sales,
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data: uk_data,
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)
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];
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}
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}
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class _SelectionCallbackState extends State<SelectionCallbackExample> {
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DateTime _time;
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Map<String, num> _measures;
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// Listens to the underlying selection changes, and updates the information
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// relevant to building the primitive legend like information under the
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// chart.
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_onSelectionChanged(charts.SelectionModel model) {
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final selectedDatum = model.selectedDatum;
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DateTime time;
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final measures = <String, num>{};
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// We get the model that updated with a list of [SeriesDatum] which is
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// simply a pair of series & datum.
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//
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// Walk the selection updating the measures map, storing off the sales and
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// series name for each selection point.
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if (selectedDatum.isNotEmpty) {
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time = selectedDatum.first.datum.time;
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selectedDatum.forEach((charts.SeriesDatum datumPair) {
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measures[datumPair.series.displayName] = datumPair.datum.sales;
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});
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}
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// Request a build.
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setState(() {
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_time = time;
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_measures = measures;
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});
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}
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@override
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Widget build(BuildContext context) {
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// The children consist of a Chart and Text widgets below to hold the info.
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final children = <Widget>[
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new SizedBox(
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height: 150.0,
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child: new charts.TimeSeriesChart(
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widget.seriesList,
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animate: widget.animate,
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selectionModels: [
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new charts.SelectionModelConfig(
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type: charts.SelectionModelType.info,
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changedListener: _onSelectionChanged,
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)
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],
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)),
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];
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// If there is a selection, then include the details.
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if (_time != null) {
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children.add(new Padding(
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padding: new EdgeInsets.only(top: 5.0),
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child: new Text(_time.toString())));
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}
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_measures?.forEach((String series, num value) {
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children.add(new Text('${series}: ${value}'));
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});
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return new Column(children: children);
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}
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}
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/// Sample time series data type.
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class TimeSeriesSales {
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final DateTime time;
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final int sales;
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TimeSeriesSales(this.time, this.sales);
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}
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