BoxPainter class Null safety

A stateful class that can paint a particular Decoration.

BoxPainter objects can cache resources so that they can be used multiple times.

Some resources used by BoxPainter may load asynchronously. When this happens, the onChanged callback will be invoked. To stop this callback from being called after the painter has been discarded, call dispose.

Constructors

BoxPainter([VoidCallback? onChanged])
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-only, inherited
onChanged VoidCallback?
Callback that is invoked if an asynchronously-loading resource used by the decoration finishes loading. For example, an image. When this is invoked, the paint method should be called again. [...]
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

dispose() → void
Discard any resources being held by the object. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
paint(Canvas canvas, Offset offset, ImageConfiguration configuration) → void
Paints the Decoration for which this object was created on the given canvas using the given configuration. [...]
toString() String
A string representation of this object. [...]
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited