Decoration class Null safety

A description of a box decoration (a decoration applied to a Rect).

This class presents the abstract interface for all decorations. See BoxDecoration for a concrete example.

To actually paint a Decoration, use the createBoxPainter method to obtain a BoxPainter. Decoration objects can be shared between boxes; BoxPainter objects can cache resources to make painting on a particular surface faster.

Mixed in types

Diagnosticable

Implementers

Annotations

@immutable

Constructors

Decoration(): Abstract const constructor. This constructor enables subclasses to provide const constructors so that they can be used in const expressions.
const

Properties

hashCode → int: The hash code for this object.
read-onlyinherited
isComplex → bool: Whether this decoration is complex enough to benefit from caching its painting.
read-only
padding → EdgeInsetsGeometry?: Returns the insets to apply when using this decoration on a box that has contents, so that the contents do not overlap the edges of the decoration. For example, if the decoration draws a frame around its edge, the padding would return the distance by which to inset the children so as to not overlap the frame.
read-only
runtimeType → Type: A representation of the runtime type of the object.
read-onlyinherited

Methods

createBoxPainter([VoidCallback onChanged]) → BoxPainter: Returns a BoxPainter that will paint this decoration.
factory">@factory
debugAssertIsValid() → bool: In debug mode, throws an exception if the object is not in a valid configuration. Otherwise, returns true.
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
getClipPath(Rect rect, TextDirection textDirection) → Path: Returns a closed Path that describes the outer edge of this decoration.
hitTest(Size size, Offset position, {TextDirection? textDirection}) → bool: Tests whether the given point, on a rectangle of a given size, would be considered to hit the decoration or not. For example, if the decoration only draws a circle, this function might return true if the point was inside the circle and false otherwise.
lerpFrom(Decoration? a, double t) → Decoration?: Linearly interpolates from another Decoration (which may be of a different class) to this.
protected">@protected
lerpTo(Decoration? b, double t) → Decoration?: Linearly interpolates from this to another Decoration (which may be of a different class).
protected">@protected
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent 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
toStringShort() → String: A brief description of this object, usually just the runtimeType and the hashCode.
override

Operators

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

Static Methods

lerp(Decoration? a, Decoration? b, double t) → Decoration?: Linearly interpolates between two Decorations.