TWatermark class

A security and confidentiality watermark overlay for admin dashboards, records, and reports.

TWatermark overlays repeated, angled text or custom branding across its child widget. The overlay is wrapped in IgnorePointer so all child interactions (clicks, text selection, form inputs, and scrolling) function completely uninterrupted.

Basic Usage

TWatermark(
  text: 'CONFIDENTIAL • admin@company.com',
  child: MyDashboardView(),
)

Multiline Watermark

TWatermark(
  lines: ['ACME CORP INTERNAL', 'John Doe (ID: 9482)', '2026-09-26 12:00 UTC'],
  opacity: 0.15,
  child: SensitiveDataTable(),
)

Inheritance

Available extensions

WidgetX

Constructors

TWatermark({Key? key, required Widget child, String? text, List<String>? lines, TextStyle? textStyle, double rotateAngle = -22.0 * math.pi / 180.0, double gapX = 160.0, double gapY = 140.0, double opacity = 0.12, bool enabled = true}): const

Properties

child → Widget: The underlying widget content being protected.
final
enabled → bool: Whether the watermark overlay is currently enabled and visible. Defaults to true.
final
gapX → double: Horizontal spacing between adjacent watermark tile centers. Defaults to 160.0.
final
gapY → double: Vertical spacing between adjacent watermark tile centers. Defaults to 140.0.
final
hashCode → int: The hash code for this object.
no setterinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
lines → List<String>?: Multiple lines of watermark text displayed together in each tile.
final
opacity → double: Opacity multiplier for the watermark overlay. Defaults to 0.12.
final
rotateAngle → double: Diagonal rotation angle in radians. Defaults to -22 degrees (-0.384 rad).
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
text → String?: Single line watermark text. If lines is provided, this is ignored.
final
textStyle → TextStyle?: Text style for the watermark. If null, a subtle dimmed style is derived from the theme.
final

Methods

box({double minW = 0.0, double minH = 0.0, double maxW = double.infinity, double maxH = double.infinity}) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in a ConstrainedBox to apply layout constraints.
build(BuildContext context) → Widget: Describes the part of the user interface represented by this widget.
override
center({bool when = true}) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in a Center widget.
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
expanded({int flex = 1}) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in an Expanded widget.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
padding([double left = 0.0, double top = 0.0, double right = 0.0, double bottom = 0.0]) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in a Padding with flexible edge control.
paddingSymmetric({double h = 0.0, double v = 0.0}) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in a Padding with symmetric horizontal and vertical spacing.
size({double? w, double? h}) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in a SizedBox to apply fixed width and/or height.
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
visible(bool visible, {bool maintainState = false}) → Widget: Available on Widget, provided by the WidgetX extension
Wraps this widget in a Visibility widget.
when(bool condition) → Widget: Available on Widget, provided by the WidgetX extension
Returns this widget if condition is true, otherwise returns SizedBox.shrink(). Usage: Text('Hello').when(isVisible)

Operators

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