A material design slider.

Used to select from a range of values.

A slider can be used to select from either a continuous or a discrete set of values. The default is 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 values discrete values 0.0, 10.0, 20.0, 30.0, 40.0, and 50.0.

The 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 slider 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 slider will listen for the onChanged callback and rebuild the slider with a new value to update the visual appearance of the slider.

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 (with margins on each side) and will shrink-wrap vertically.

Requires one of its ancestors to be a Material widget.

See also:

Inheritance

Constructors

Slider({Key key, @required double value, @required ValueChanged<double> onChanged, double min: 0.0, double max: 1.0, int divisions, String label, Color activeColor, Color inactiveColor, bool thumbOpenAtMin: false })
Creates a material design slider. [...]
const

Properties

activeColor Color
The color to use for the portion of the slider that has been selected. [...]
final
divisions int
The number of discrete divisions. [...]
final
inactiveColor Color
The color for the unselected portion of the slider. [...]
final
label String
A label to show above the slider when the slider is active. [...]
final
max double
The maximum value the user can select. [...]
final
min double
The minimum value the user can select. [...]
final
onChanged ValueChanged<double>
Called when the user selects a new value for the slider. [...]
final
thumbOpenAtMin bool
Whether the thumb should be an open circle when the slider is at its minimum position. [...]
final
value double
The currently selected value for this slider. [...]
final
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

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

Operators

operator ==(other) bool
The equality operator. [...]
inherited