FluentGanttChartDelegate class

Renders Gantt spans into the shared cartesian shell.

Ports GanttChart.tsx (620 lines). useGanttChartStyles is inert upstream — every class name resolves to the empty string — so no visual property is inherited from it.

points arrive with their colours already assigned: upstream's _points memo (GanttChart.tsx:72-100) walks the data once, mints one palette colour per legend, and rewrites every point's color before the chart ever draws. The widget owns that pass, so this delegate only falls back to the palette for a point that still has no colour.

Inheritance

• Object
• FluentCartesianSeriesDelegate
• FluentGanttChartDelegate

Constructors

FluentGanttChartDelegate({required List<FluentGanttChartDataPoint> points, required FluentGanttChartStyle style, required FluentChartColors colors, required FluentChartTextMeasurer measurer, required List<String> selectedLegends, String? hoveredLegend, double? barHeightProp, double maxBarHeight = kGanttDefaultBarHeight, double yAxisPadding = 0.5, bool enableGradient = false, bool roundCorners = false, bool useUtc = true, String? culture, FluentAxisCategoryOrder? yAxisCategoryOrder})

Creates a delegate.

const

Properties

barHeightProp → double?

Explicit bar height, overriding the auto solve (GanttChart.tsx:336).

final

barWidth → double?

The bar width the x domain solve is given (CartesianChart.tsx:200).

no setter, inherited

chartTitle → String?

The narration prefix. Upstream uses props.chartTitle only for the SVG aria-label (CartesianChart.tsx:554) and never draws it; charts compose it themselves, e.g. LineChart.tsx:1843-1846.

no setter, inherited

chartType → FluentChartType

Which of the nine shell consumers this is (ChartTypes, utilities.ts:98-108). Selects the gridline and band-width special cases.

no setter, override

colors → FluentChartColors

Resolved chart colours.

final

culture → String?

BCP-47 locale for date formatting.

final

datasetForXAxisDomain → List<String>?

The band domain for a categorical x axis (CartesianChart.tsx:264).

no setter, inherited

dateFormatLevels → (int, int)

The (min, max) date-format levels across every start and end.

no setter

enableGradient → bool

Whether each legend paints a left-to-right gradient.

final

hashCode → int

The hash code for this object.

no setter, inherited

hoveredLegend → String?

Legend title currently hovered.

final

isIntegralDataset → bool

Whether every y value is a whole number.

no setter, inherited

maxBarHeight → double

Bar height ceiling — 24 (GanttChart.tsx:45).

final

maxOfYVal → double?

AreaChart's precomputed y ceiling (CartesianChart.tsx:305).

no setter, inherited

measurer → FluentChartTextMeasurer

The chart subtree's single text measurer.

final

orderedYAxisLabels → List<String>

The y-axis labels in band order — bottom of the plot first.

no setter

points → List<FluentGanttChartDataPoint>

The spans, in author order, with colours already assigned.

final

roundCorners → bool

Whether bars get a 3px corner radius.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

selectedLegends → List<String>

Legend titles selected by the user.

final

stringDatasetForYAxisDomain → List<String>?

The band domain for a categorical y axis (CartesianChart.tsx:324).

no setter, override

style → FluentGanttChartStyle

The resolved style.

final

tickParams → FluentTickParams

Explicit tick values and format handed to the x builders (CartesianChart.tsx:239-267).

no setter, inherited

useUtc → bool

Whether dates are formatted in UTC — default true (GanttChart.tsx:45).

final

xAxisInnerPadding → double?

Inner band padding for the x axis (CartesianChart.tsx:217).

no setter, inherited

xAxisOuterPadding → double?

Outer band padding for the x axis (CartesianChart.tsx:218).

no setter, inherited

xAxisPadding → double?

Shorthand band padding for the x axis (CartesianChart.tsx:216).

no setter, inherited

xAxisTickLayout → FluentTickLayout

Fallback for props.xAxis?.tickLayout (CartesianChart.tsx:220, :282, :385).

no setter, inherited

xAxisType → FluentChartAxisType

The x-axis kind, which selects the x builder (CartesianChart.tsx:237-278).

no setter, override

yAxisCategoryOrder → FluentAxisCategoryOrder?

Ordering applied to a category y axis, or null when the caller named none.

final

yAxisPadding → double

Band padding, already resolved by getScalePadding (GanttChart.tsx:116-118).

final

yAxisType → FluentChartAxisType

The y-axis kind. FluentChartAxisType.category routes to createStringYAxis (CartesianChart.tsx:321).

no setter, override

Methods

barHeightFor(double adjustedValue) → double

Ports _getBarHeight (GanttChart.tsx:333-348).

barsFor(FluentCartesianChildContext context, FluentCartesianLayout layout) → List<FluentGanttBar>

Resolves every bar, in draw order.

buildHitRegions(FluentCartesianChildContext context, FluentCartesianLayout layout) → List<FluentChartHitRegion>

The interactive areas over the plot, in paint order.

override

createStringYAxis(FluentYAxisParams params, List<String> dataPoints, FluentAxisData axisData, {required bool isRtl}) → FluentAxisSpec

createStringYAxis (CartesianChart.tsx:322-329).

override

createYAxis(FluentYAxisParams params, FluentAxisData axisData, {required bool isRtl, required bool isIntegralDataset, bool useSecondaryYScale = false}) → FluentAxisSpec

createYAxis (CartesianChart.tsx:351, :363).

override

domainMargins(double containerWidth, FluentChartMargins margins) → FluentChartMargins?

Adjusted margins for the x domain solve, or null to use the shell's (CartesianChart.tsx:195).

inherited

formattedSpan(FluentGanttChartDataPoint point) → String

"<start> - <end>" (GanttChart.tsx:196-224).

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

paintSeries(Canvas canvas, FluentCartesianChildContext context, FluentCartesianLayout layout, FluentChartColors colors) → void

Paints the marks.

override

resolveXDomainRange({required FluentChartMargins margins, required double containerWidth, required bool isRtl, required double? barWidth, required List<Object>? tickValues}) → FluentChartDomainRange

getDomainNRangeValues (CartesianChart.tsx:193-202).

override

resolveYMinMax({bool useSecondaryYScale = false}) → FluentChartMinMax

getMinMaxOfYAxis (CartesianChart.tsx:306, :347).

override

toString() → String

A string representation of this object.

inherited

yDomainMargins(double containerHeight) → FluentChartMargins?

Adjusted margins for the primary y solve, or null to use the shell's (CartesianChart.tsx:296). The secondary axis never gets these (:338); that asymmetry is upstream's and is reproduced.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited