**How to Add a Range Slider in Flutter**
Hey there, Flutter developers! Are you looking for a way to add a range slider to your application? Well, you’ve come to the right place! In this blog post, we’ll show you how to add a range slider in Flutter.
**What is a Range Slider?**
A range slider, also known as a range selector or a scale slider, is a UI component that allows users to select a range of values within a given range. It’s commonly used in applications where users need to select a specific range of values, such as a date range or a slider for audio volume control.
**The `RangeSlider` Widget in Flutter**
Luckily for us, Flutter provides a built-in `RangeSlider` widget that makes it easy to add a range slider to your application. The `RangeSlider` widget is a part of the `material.dart` library, so we need to import it at the top of our Dart file:
“`dart
import ‘package:flutter/material.dart’;
“`
**Using the `RangeSlider` Widget**
To use the `RangeSlider` widget, we need to create a stateless widget that contains the slider. Here’s an example:
“`dart
class RangeSliderExample extends StatelessWidget {
@override
Widget build(BuildContext context) {
return RangeSlider(
value: values,
min: 0.0,
max: 100.0,
divisors: [25, 50, 75],
labels: [0.0, 25.0, 50.0, 75.0, 100.0],
);
}
}
“`
In this example, we create a `RangeSlider` widget with the following properties:
* `value`: This is a list of two values that represent the minimum and maximum values of the range.
* `min` and `max`: These are the minimum and maximum values of the range.
* `divisors`: This is a list of values that the slider can snap to. In this example, the slider can snap to values at 25, 50, and 75.
* `labels`: This is a list of labels that appear on the slider at specific values. In this example, the labels appear at 0, 25, 50, 75, and 100.
**Handling Slider Values**
When the user adjusts the slider, the `value` property of the slider changes to reflect the new range. We can access the new range values by using the `value` property of the slider. For example:
“`dart
class RangeSliderExample extends StatefulWidget {
@override
_RangeSliderExampleState createState() => _RangeSliderExampleState();
}
class _RangeSliderExampleState extends State {
double _values = [0.0, 100.0];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(‘Range Slider Example’),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
RangeSlider(
value: _values,
min: 0.0,
max: 100.0,
divisors: [25, 50, 75],
labels: [0.0, 25.0, 50.0, 75.0, 100.0],
onChanged: (values) {
setState(() {
_values = values;
});
},
),
Text(‘Selected range: ${_values.join(‘-‘)}’),
],
),
),
);
}
}
“`
In this example, we create a stateful widget that contains a `RangeSlider` widget. When the user adjusts the slider, the `onChanged` callback is called with the new range values. We use the `setState` method to update the `_values` state variable, which is displayed on the screen as a text.
That’s it! In this blog post, we’ve learned how to add a range slider to our Flutter application using the `RangeSlider` widget. With just a few lines of code, we can create a range slider that allows users to select a range of values within a given range.
If you have any questions or need further assistance, feel free to leave a comment below. Happy coding!
