DecorationPainter class abstract

Abstract class for decorations Decorations are placed under and/or above items in the charts

Implementers

• BorderDecoration
• GridDecoration
• HorizontalAxisDecoration
• SelectedItemDecoration
• SparkLineDecoration
• TargetAreaDecoration
• TargetLineDecoration
• TargetLineLegendDecoration
• ValueDecoration
• VerticalAxisDecoration
• WidgetDecoration

Constructors

DecorationPainter()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

animateTo(DecorationPainter endValue, double t) → DecorationPainter

Animate to next decoration state, each decoration should implement this. This is just regular lerp function, but instead of static function where you pass start and end state, here we start with current state and animate to endValue.

applyPaintTransform(ChartState state, Size size) → Offset

draw(Canvas canvas, Size size, ChartState state) → void

Draw decoration. Decoration can be foreground or background decoration that will be drawn on the chart decorations can ignore padding and can use whole available canvas to draw.

getRenderer(ChartState state) → Widget

initDecoration(ChartState state) → void

Init decoration is first thing called on decorations, it will pass current ChartState so decoration can easily calculate needed stuff for their layout.

isSameType(DecorationPainter other) → bool

Used for animating, we just need to find matching type, don't actually check for equality since we want to animate from one state to other. Some decorations may consider overriding this in case multiples are used

layoutSize(BoxConstraints constraints, ChartState state) → Size

marginNeeded() → EdgeInsets

Get extra margin (not definable by the user). This makes sure that any decoration that leaves original drawing window is not drawing outside of that window (This is not enforced right now but it's unwanted behaviour)

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

paddingNeeded() → EdgeInsets

Get extra padding (not definable by user, calculated by decoration if needed). This makes sure that decoration will fit with the chart in wanted area.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited