Starter/samples
1
0
Fork 0
mirror of https://github.com/flutter/samples.git synced 2025-11-08 22:09:06 +00:00
Code Issues Releases Wiki Activity

web/charts: Migrate to null safety (#921)

Browse Source
This commit is contained in:
Brett Morgan
2021-10-08 16:39:37 +11:00
committed by GitHub
parent d14e79b833
commit 8932e60976
106 changed files with 355 additions and 346 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
web/charts/lib/behaviors/slider.dart
View File

@@ -33,10 +33,10 @@ import 'package:flutter/scheduler.dart';
/// [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;
final List<charts.Series<dynamic, num>> seriesList;
final bool? animate;
const SliderLine(this.seriesList, {this.animate, Key key}) : super(key: key);
const SliderLine(this.seriesList, {this.animate, Key? key}) : super(key: key);
/// Creates a [LineChart] with sample data and no transition.
factory SliderLine.withSampleData() {
@@ -103,9 +103,9 @@ class SliderLine extends StatefulWidget {
}
class _SliderCallbackState extends State<SliderLine> {
num _sliderDomainValue;
String _sliderDragState;
Point<int> _sliderPosition;
num? _sliderDomainValue;
String? _sliderDragState;
Point<int>? _sliderPosition;
// Handles callbacks when the user drags the slider.
_onSliderChange(Point<int> point, dynamic domain, String roleId,
@@ -119,7 +119,7 @@ class _SliderCallbackState extends State<SliderLine> {
});
}
SchedulerBinding.instance.addPostFrameCallback(rebuild);
SchedulerBinding.instance!.addPostFrameCallback(rebuild);
}
@override
@@ -175,7 +175,7 @@ class _SliderCallbackState extends State<SliderLine> {
children.add(Padding(
padding: const EdgeInsets.only(top: 5.0),
child: Text(
'Slider position: ${_sliderPosition.x}, ${_sliderPosition.y}')));
'Slider position: ${_sliderPosition!.x}, ${_sliderPosition!.y}')));
}
if (_sliderDragState != null) {
children.add(Padding(