SparkChartTrackball class

Enables and customizes the trackball.

Trackball feature displays the tooltip for the data points that are closer to the point where you touch on the chart area. This feature can be enabled by creating an instance of SparkChartTrackball.

Provides option to customizes the activationMode, width, color, labelStyle, backgroundColor, borderColor, borderWidth.

Annotations

• @immutable

Constructors

SparkChartTrackball({double width = 2, Color? color, List<double>? dashArray, SparkChartActivationMode activationMode = SparkChartActivationMode.tap, TextStyle labelStyle = const TextStyle(fontFamily: 'Roboto', fontStyle: FontStyle.normal, fontWeight: FontWeight.normal, fontSize: 12), SparkChartTooltipCallback<String>? tooltipFormatter, Color? backgroundColor, bool shouldAlwaysShow = false, double hideDelay = 0, Color? borderColor, double borderWidth = 0, BorderRadius borderRadius = const BorderRadius.all(Radius.circular(5))})

Creates an instance of spark chart trackball to enable the trackball on the closest data point from the touch position.

const

Properties

activationMode → SparkChartActivationMode

Defines the gesture for activating the trackball to the closest data point.

final

backgroundColor → Color?

Customizes the background color of the trackball tooltip. The color is set based on the current application theme, if its value is set to null.

final

borderColor → Color?

Customizes the border color of the trackball tooltip. To make border visible for plot band, need to set both the border color and border width.

final

borderRadius → BorderRadius

Customizes the border radius of trackball tooltip.

final

borderWidth → double

Customizes the border width of the plot band. To make border visible for plot band, need to set both the border color and border width.

final

color → Color?

Customizes the color of the trackball line. The color is set based on the current application theme, if its value is set to null.

final

dashArray → List<double>?

Dashes of the trackball line. Any number of values can be provided on the list. Odd value is considered as rendering size and even value is considered a gap.

final

hashCode → int

The hash code for this object.

no setter, override

hideDelay → double

Provides the time delay to disappear the trackball on touch. The provided value will be considered as milliseconds. When `shouldAlwaysShow` is set as false, the value provided to this property will be considered as a delay.

final

labelStyle → TextStyle

Customizes the data label text style.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

shouldAlwaysShow → bool

Shows or hides the trackball..

final

tooltipFormatter → SparkChartTooltipCallback<String>?

Callback that gets triggered when a trackball tooltip text is created.

final

width → double

Customizes the width of the trackball line.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

override