TapeMeasureSlider class

A slider with tape measure look. A drop-in replacement for Slider with a few extra features.

Used to select from a range of values.

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 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 slider will listen for the onChanged callback and rebuild the slider with a new value 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 (with margins on each side) and will shrink-wrap vertically.

  • Slider, a Material Design slider.
  • MediaQuery, from which the text scale factor is obtained.
Inheritance

Constructors

TapeMeasureSlider.new({Key? key, required double value, required ValueChanged<double>? onChanged, ValueChanged<double>? onChangeStart, ValueChanged<double>? onChangeEnd, double min = 0.0, double max = 1.0, int divisions = 100, int smallTickEvery = 10, int bigTickEvery = 50, int? mainTickEvery, int? mainSnapDistance, String? label, Color? tickColor, Color? activeColor, Color? inactiveColor, MouseCursor? mouseCursor, SemanticFormatterCallback? semanticFormatterCallback, FocusNode? focusNode, bool autofocus = false})
Creates a slider with tape measure look.
const

Properties

activeColor → Color?
The color to use for the portion of the slider track that is active.
final
autofocus → bool
True if this widget will be selected as the initial focus when no other node in its scope is currently focused.
final
bigTickEvery → int
The number of divisions between big ticks.
final
divisions → int
The number of discrete divisions.
final
focusNode → FocusNode?
An optional focus node to use as the focus node for this widget.
final
hashCode → int
The hash code for this object.
no setterinherited
inactiveColor → Color?
The color for the inactive portion of the slider track.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
label → String?
A label to show above the slider when the slider is active.
final
mainSnapDistance → int?
The thumb will snap to the nearest tick if it comes closer than this distance.
final
mainTickEvery → int?
The number of divisions between main ticks.
final
max → double
The maximum value the user can select.
final
min → double
The minimum value the user can select.
final
mouseCursor → MouseCursor?
The cursor for a mouse pointer when it enters or is hovering over the widget.
final
onChanged → ValueChanged<double>?
Called during a drag when the user is selecting a new value for the slider by dragging.
final
onChangeEnd → ValueChanged<double>?
Called when the user is done selecting a new value for the slider.
final
onChangeStart → ValueChanged<double>?
Called when the user starts selecting a new value for the slider.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
semanticFormatterCallback → SemanticFormatterCallback?
The callback used to create a semantic value from a slider value.
final
smallTickEvery → int
The number of divisions between small ticks.
final
tickColor → Color?
The color to use for the ticks.
final
value → double
The currently selected value for this slider.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → _TapeMeasureSliderState
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent 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 DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

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