SignaturePage class

A page that allows users to draw and save their signature.

The SignaturePage widget provides a canvas for users to draw their signature using touch gestures. It includes options to clear the canvas or save the signature as an image file. The signature is rendered using a CustomPaint widget and managed with a list of Offset points.

Features:

  • Draw signature with touch input.
  • Clear the signature canvas.
  • Save the signature as a PNG image file to the device's application support directory.

The signature is captured using a RepaintBoundary for high-quality image export. The saved image path is returned when the user taps the "Save" button.

Example usage:

Navigator.push(
  context,
  MaterialPageRoute(builder: (context) => SignaturePage()),
);
Inheritance
Available extensions

Constructors

SignaturePage({Key? key})
const

Properties

hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
marginZero → Widget

Available on Widget, provided by the WidgetMarginX extension

no setter
paddingZero → Widget

Available on Widget, provided by the WidgetPaddingX extension

no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
sliverBox → Widget

Available on Widget, provided by the WidgetSliverBoxX extension

no setter

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<SignaturePage>
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
marginAll(double margin) → Widget

Available on Widget, provided by the WidgetMarginX extension

marginOnly({double left = 0.0, double top = 0.0, double right = 0.0, double bottom = 0.0}) → Widget

Available on Widget, provided by the WidgetMarginX extension

marginSymmetric({double horizontal = 0.0, double vertical = 0.0}) → Widget

Available on Widget, provided by the WidgetMarginX extension

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
paddingAll(double padding) → Widget

Available on Widget, provided by the WidgetPaddingX extension

paddingOnly({double left = 0.0, double top = 0.0, double right = 0.0, double bottom = 0.0}) → Widget

Available on Widget, provided by the WidgetPaddingX extension

paddingSymmetric({double horizontal = 0.0, double vertical = 0.0}) → Widget

Available on Widget, provided by the WidgetPaddingX extension

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
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

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