SignatureOverlayWidget class

A widget that overlays a draggable, resizable, and pinchable signature image on top of a page.

Features:

  • Drag the entire signature area.
  • Resize using the bottom-right handle.
  • Pinch to zoom in/out.
  • Double-tap for custom actions.
Inheritance

Constructors

SignatureOverlayWidget.new({Key? key, required double left, required double top, required double width, required double height, required Image image, required ValueChanged<Offset> onDragDelta, required ValueChanged<Offset> onResizeDelta, VoidCallback? onPinchStart, ValueChanged<double>? onPinchUpdate, VoidCallback? onPinchEnd, VoidCallback? onDoubleTap})
const

Properties

hashCode → int
The hash code for this object.
no setterinherited
height → double
The current height of the signature area.
final
image → Image
The signature image to render inside the area.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
left → double
The left offset position of the signature.
final
onDoubleTap → VoidCallback?
Called when the user double-taps the signature area.
final
onDragDelta → ValueChanged<Offset>
Called when the main area is dragged.
final
onPinchEnd → VoidCallback?
Called when the pinch gesture ends.
final
onPinchStart → VoidCallback?
Called when a two-finger pinch starts over the signature area.
final
onPinchUpdate → ValueChanged<double>?
Called with the current gesture's scale factor.
final
onResizeDelta → ValueChanged<Offset>
Called when the bottom-right resize handle is dragged.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
top → double
The top offset position of the signature.
final
width → double
The current width of the signature area.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
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
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent 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
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