RangeSlider class

A Material Design range slider.

Used to select a range from a range of values.

A range slider widget, consisting of 5 divisions and showing the default
value indicator.

This range values are in intervals of 20 because the Range Slider has 5 divisions, from 0 to 100. This means are values are split between 0, 20, 40, 60, 80, and 100. The range values are initialized with 40 and 80 in this demo.


To create a local project with this code sample, run:
flutter create --sample=material.RangeSlider.1 mysample

A range slider can be used to select from either a continuous or a discrete set of values. The default is to use a continuous range of values from min to max. To use discrete values, use a non-null value for divisions, which indicates the number of discrete intervals. For example, if min is 0.0 and max is 50.0 and divisions is 5, then the slider can take on the discrete values 0.0, 10.0, 20.0, 30.0, 40.0, and 50.0.

The terms for the parts of a slider are:

  • The "thumbs", which are the shapes that slide horizontally when the user drags them to change the selected range.
  • The "track", which is the horizontal line that the thumbs can be dragged along.
  • The "tick marks", which mark the discrete values of a discrete slider.
  • The "overlay", which is a highlight that's drawn over a thumb in response to a user tap-down gesture.
  • The "value indicators", which are the shapes that pop up when the user is dragging a thumb to show the value being selected.
  • The "active" segment of the slider is the segment between the two thumbs.
  • The "inactive" slider segments are the two track intervals outside of the slider's thumbs.

The range slider will be disabled if onChanged is null or if the range given by min..max is empty (i.e. if min is equal to max).

The range slider widget itself does not maintain any state. Instead, when the state of the slider changes, the widget calls the onChanged callback. Most widgets that use a range slider will listen for the onChanged callback and rebuild the slider with new values to update the visual appearance of the slider. To know when the value starts to change, or when it is done changing, set the optional callbacks onChangeStart and/or onChangeEnd.

By default, a slider will be as wide as possible, centered vertically. When given unbounded constraints, it will attempt to make the track 144 pixels wide (including margins on each side) and will shrink-wrap vertically.

Requires one of its ancestors to be a Material widget. This is typically provided by a Scaffold widget.

Requires one of its ancestors to be a MediaQuery widget. Typically, a MediaQuery widget is introduced by the MaterialApp or WidgetsApp widget at the top of your application widget tree.

To determine how it should be displayed (e.g. colors, thumb shape, etc.), a slider uses the SliderThemeData available from either a SliderTheme widget, or the ThemeData.sliderTheme inside a Theme widget above it in the widget tree. You can also override some of the colors with the activeColor and inactiveColor properties, although more fine-grained control of the colors, and other visual properties is achieved using a SliderThemeData.

See also:



RangeSlider({Key? key, required RangeValues values, required ValueChanged<RangeValues>? onChanged, ValueChanged<RangeValues>? onChangeStart, ValueChanged<RangeValues>? onChangeEnd, double min = 0.0, double max = 1.0, int? divisions, RangeLabels? labels, Color? activeColor, Color? inactiveColor, MaterialStateProperty<Color?>? overlayColor, MaterialStateProperty<MouseCursor?>? mouseCursor, SemanticFormatterCallback? semanticFormatterCallback})
Creates a Material Design range slider.


activeColor Color?
The color of the track's active segment, i.e. the span of track between the thumbs.
divisions int?
The number of discrete divisions.
hashCode int
The hash code for this object.
no setterinherited
inactiveColor Color?
The color of the track's inactive segments, i.e. the span of tracks between the min and the start thumb, and the end thumb and the max.
key Key?
Controls how one widget replaces another widget in the tree.
labels RangeLabels?
Labels to show as text in the SliderThemeData.rangeValueIndicatorShape when the slider is active and SliderThemeData.showValueIndicator is satisfied.
max double
The maximum value the user can select.
min double
The minimum value the user can select.
mouseCursor MaterialStateProperty<MouseCursor?>?
The cursor for a mouse pointer when it enters or is hovering over the widget.
onChanged ValueChanged<RangeValues>?
Called when the user is selecting a new value for the slider by dragging.
onChangeEnd ValueChanged<RangeValues>?
Called when the user is done selecting new values for the slider.
onChangeStart ValueChanged<RangeValues>?
Called when the user starts selecting new values for the slider.
overlayColor MaterialStateProperty<Color?>?
The highlight color that's typically used to indicate that the range slider thumb is hovered or dragged.
runtimeType Type
A representation of the runtime type of the object.
no setterinherited
semanticFormatterCallback SemanticFormatterCallback?
The callback used to create a semantic value from the slider's values.
values RangeValues
The currently selected values for this range slider.


createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
createState() State<RangeSlider>
Creates the mutable state for this widget at a given location in the tree.
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) String
A string representation of this object.
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants.
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object.
toStringShort() String
A short, textual description of this widget.


operator ==(Object other) bool
The equality operator.