BarChart class

A bar chart widget that visualises categorical data as vertical bars.

Supply a dataset of DataItem objects and the chart will render each item as a bar whose height is proportional to its value.

Example:

BarChart(
  title: 'Fruits',
  dataset: [
    DataItem(id: 0, label: 'Apples', value: 50),
    DataItem(id: 1, label: 'Oranges', value: 30),
  ],
)
Inheritance

Constructors

BarChart({Key? key, required List<DataItem> dataset, String title = '', double? height, double? width, double maxWidth = 600.0, List<Color> customColors = colors, Color? backGroundColor, bool showTitle = true, bool showLabels = true, bool showLegend = false, bool showLines = true, bool animate = true, Duration animationDuration = const Duration(milliseconds: 900), Curve animationCurve = Curves.easeOutCubic, bool enableHover = true, ValueChanged<DataItem?>? onBarHover, bool enableTapHighlight = true, bool toggleTapHighlight = true, dynamic onBarTap(DataItem) = _defaultOnTap, DatasetOrdering? datasetOrdering})
Creates a BarChart.
const

Properties

animate → bool
Whether to animate the chart when it is first shown or rebuilt.
final
animationCurve → Curve
Curve used by the entry animation.
final
animationDuration → Duration
Duration of the entry animation.
final
backGroundColor → Color?
Background color of the chart container.
final
customColors → List<Color>
Color palette used when a DataItem does not specify its own color.
final
dataset → List<DataItem>
The data items to display as bars.
final
datasetOrdering → DatasetOrdering?
Optional ordering applied to dataset before rendering.
final
enableHover → bool
Whether hovering with a mouse pointer highlights bars (desktop/web).
final
enableTapHighlight → bool
Whether tapping a bar highlights it (useful on mobile where hover doesn't exist).
final
hashCode → int
The hash code for this object.
no setterinherited
height → double?
Fixed height for the chart widget.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
maxWidth → double
Maximum width the chart may occupy. Defaults to 600.0.
final
onBarHover → ValueChanged<DataItem?>?
Callback invoked when the hovered bar changes (desktop/web).
final
onBarTap → dynamic Function(DataItem)
Callback invoked when the user taps a bar.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
showLabels → bool
Whether to render bar labels below each bar. Defaults to true.
final
showLegend → bool
Whether to render the legend below the chart. Defaults to false.
final
showLines → bool
Whether to render the horizontal grid lines. Defaults to true.
final
showTitle → bool
Whether to render the chart title. Defaults to true.
final
title → String
Optional title displayed at the top of the chart.
final
toggleTapHighlight → bool
Whether tapping the already-highlighted bar clears the highlight.
final
width → double?
Fixed width for the chart widget.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<BarChart>
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.
inherited
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