USignatureController class

Controls and holds the state of a USignaturePadRaw. Strokes get a velocity-variable width for a natural pen feel, and can be undone, redone, cleared and exported to a PNG.

Inheritance

Constructors

USignatureController({Color penColor = const Color(0xFF1A1A1A), double minWidth = 1.5, double maxWidth = 4.5, double velocityScale = 1.6})

Properties

activeStroke → USignatureStroke?
no setter
canRedo → bool
no setter
canUndo → bool
no setter
canvasSize ↔ Size
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
isEmpty → bool
no setter
isNotEmpty → bool
no setter
maxWidth ↔ double
getter/setter pair
minWidth ↔ double
getter/setter pair
penColor ↔ Color
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
strokes → List<USignatureStroke>
no setter
velocityScale → double
Pen velocity (logical px/ms) at which the stroke reaches minWidth.
final

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
beginStroke(Offset point) → void
clear() → void
commitStroke() → void
dispose() → void
Discards any resources used by the object.
inherited
extendStroke(Offset point, double speed) → void
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
redo() → void
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toPngBytes({double pixelRatio = 3, Color? background}) → Future<Uint8List?>
toString() → String
A string representation of this object.
inherited
undo() → void

Operators

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