mirror of
https://github.com/flutter/samples.git
synced 2026-04-25 08:22:16 +00:00
Add flutter_web samples (#75)
This commit is contained in:
Kevin Moore
committed by
Andrew Brogdon
Andrew Brogdon
parent
42f2dce01b
commit
3fe927cb29
196
web/charts/example/lib/behaviors/slider.dart
Normal file
196
web/charts/example/lib/behaviors/slider.dart
Normal file
@@ -0,0 +1,196 @@
|
||||
// Copyright 2018 the Charts project authors. Please see the AUTHORS file
|
||||
// for details.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
// EXCLUDE_FROM_GALLERY_DOCS_START
|
||||
import 'dart:math';
|
||||
// EXCLUDE_FROM_GALLERY_DOCS_END
|
||||
import 'package:charts_flutter/flutter.dart' as charts;
|
||||
import 'package:flutter_web/material.dart';
|
||||
import 'package:flutter_web/rendering.dart';
|
||||
import 'package:flutter_web/scheduler.dart';
|
||||
|
||||
/// This is just a simple line chart with a behavior that adds slider controls.
|
||||
///
|
||||
/// A [Slider] behavior is added manually to enable slider controls, with an
|
||||
/// initial position at 1 along the domain axis.
|
||||
///
|
||||
/// An onChange event handler has been configured to demonstrate updating a div
|
||||
/// with data from the slider's current position. An "initial" drag state event
|
||||
/// will be fired when the chart is drawn because an initial domain value is
|
||||
/// set.
|
||||
///
|
||||
/// [Slider.moveSliderToDomain] can be called to programmatically position the
|
||||
/// slider. This is useful for synchronizing the slider with external elements.
|
||||
class SliderLine extends StatefulWidget {
|
||||
final List<charts.Series> seriesList;
|
||||
final bool animate;
|
||||
|
||||
SliderLine(this.seriesList, {this.animate});
|
||||
|
||||
/// Creates a [LineChart] with sample data and no transition.
|
||||
factory SliderLine.withSampleData() {
|
||||
return new SliderLine(
|
||||
_createSampleData(),
|
||||
// Disable animations for image tests.
|
||||
animate: false,
|
||||
);
|
||||
}
|
||||
|
||||
// EXCLUDE_FROM_GALLERY_DOCS_START
|
||||
// This section is excluded from being copied to the gallery.
|
||||
// It is used for creating random series data to demonstrate animation in
|
||||
// the example app only.
|
||||
factory SliderLine.withRandomData() {
|
||||
return new SliderLine(_createRandomData());
|
||||
}
|
||||
|
||||
/// Create random data.
|
||||
static List<charts.Series<LinearSales, num>> _createRandomData() {
|
||||
final random = new Random();
|
||||
|
||||
final data = [
|
||||
new LinearSales(0, random.nextInt(100)),
|
||||
new LinearSales(1, random.nextInt(100)),
|
||||
new LinearSales(2, random.nextInt(100)),
|
||||
new LinearSales(3, random.nextInt(100)),
|
||||
];
|
||||
|
||||
return [
|
||||
new charts.Series<LinearSales, int>(
|
||||
id: 'Sales',
|
||||
domainFn: (LinearSales sales, _) => sales.year,
|
||||
measureFn: (LinearSales sales, _) => sales.sales,
|
||||
data: data,
|
||||
)
|
||||
];
|
||||
}
|
||||
// EXCLUDE_FROM_GALLERY_DOCS_END
|
||||
|
||||
// We need a Stateful widget to build the selection details with the current
|
||||
// selection as the state.
|
||||
@override
|
||||
State<StatefulWidget> createState() => new _SliderCallbackState();
|
||||
|
||||
/// Create one series with sample hard coded data.
|
||||
static List<charts.Series<LinearSales, int>> _createSampleData() {
|
||||
final data = [
|
||||
new LinearSales(0, 5),
|
||||
new LinearSales(1, 25),
|
||||
new LinearSales(2, 100),
|
||||
new LinearSales(3, 75),
|
||||
];
|
||||
|
||||
return [
|
||||
new charts.Series<LinearSales, int>(
|
||||
id: 'Sales',
|
||||
domainFn: (LinearSales sales, _) => sales.year,
|
||||
measureFn: (LinearSales sales, _) => sales.sales,
|
||||
data: data,
|
||||
)
|
||||
];
|
||||
}
|
||||
}
|
||||
|
||||
class _SliderCallbackState extends State<SliderLine> {
|
||||
num _sliderDomainValue;
|
||||
String _sliderDragState;
|
||||
Point<int> _sliderPosition;
|
||||
|
||||
// Handles callbacks when the user drags the slider.
|
||||
_onSliderChange(Point<int> point, dynamic domain, String roleId,
|
||||
charts.SliderListenerDragState dragState) {
|
||||
// Request a build.
|
||||
void rebuild(_) {
|
||||
setState(() {
|
||||
_sliderDomainValue = (domain * 10).round() / 10;
|
||||
_sliderDragState = dragState.toString();
|
||||
_sliderPosition = point;
|
||||
});
|
||||
}
|
||||
|
||||
SchedulerBinding.instance.addPostFrameCallback(rebuild);
|
||||
}
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
// The children consist of a Chart and Text widgets below to hold the info.
|
||||
final children = <Widget>[
|
||||
new SizedBox(
|
||||
height: 150.0,
|
||||
child: new charts.LineChart(
|
||||
widget.seriesList,
|
||||
animate: widget.animate,
|
||||
// Configures a [Slider] behavior.
|
||||
//
|
||||
// Available options include:
|
||||
//
|
||||
// [eventTrigger] configures the type of mouse gesture that controls
|
||||
// the slider.
|
||||
//
|
||||
// [handleRenderer] draws a handle for the slider. Defaults to a
|
||||
// rectangle.
|
||||
//
|
||||
// [initialDomainValue] sets the initial position of the slider in
|
||||
// domain units. The default is the center of the chart.
|
||||
//
|
||||
// [onChangeCallback] will be called when the position of the slider
|
||||
// changes during a drag event.
|
||||
//
|
||||
// [roleId] optional custom role ID for the slider. This can be used to
|
||||
// allow multiple [Slider] behaviors on the same chart. Normally, there can
|
||||
// only be one slider (per event trigger type) on a chart. This setting
|
||||
// allows for configuring multiple independent sliders.
|
||||
//
|
||||
// [snapToDatum] configures the slider to snap snap onto the nearest
|
||||
// datum (by domain distance) when dragged. By default, the slider
|
||||
// can be positioned anywhere along the domain axis.
|
||||
//
|
||||
// [style] takes in a [SliderStyle] configuration object, and
|
||||
// configures the color and sizing of the slider line and handle.
|
||||
behaviors: [
|
||||
new charts.Slider(
|
||||
initialDomainValue: 1.0, onChangeCallback: _onSliderChange),
|
||||
],
|
||||
)),
|
||||
];
|
||||
|
||||
// If there is a slider change event, then include the details.
|
||||
if (_sliderDomainValue != null) {
|
||||
children.add(new Padding(
|
||||
padding: new EdgeInsets.only(top: 5.0),
|
||||
child: new Text('Slider domain value: ${_sliderDomainValue}')));
|
||||
}
|
||||
if (_sliderPosition != null) {
|
||||
children.add(new Padding(
|
||||
padding: new EdgeInsets.only(top: 5.0),
|
||||
child: new Text(
|
||||
'Slider position: ${_sliderPosition.x}, ${_sliderPosition.y}')));
|
||||
}
|
||||
if (_sliderDragState != null) {
|
||||
children.add(new Padding(
|
||||
padding: new EdgeInsets.only(top: 5.0),
|
||||
child: new Text('Slider drag state: ${_sliderDragState}')));
|
||||
}
|
||||
|
||||
return new Column(children: children);
|
||||
}
|
||||
}
|
||||
|
||||
/// Sample linear data type.
|
||||
class LinearSales {
|
||||
final int year;
|
||||
final int sales;
|
||||
|
||||
LinearSales(this.year, this.sales);
|
||||
}
|
||||
Reference in New Issue
Block a user