TCheckbox class

A checkbox input with validation and theming support.

TCheckbox provides a customizable checkbox with:

  • Optional label text
  • Validation support
  • Tristate mode (true/false/null)
  • Custom colors and sizes
  • Disabled state
  • Value binding with ValueNotifier

Basic Usage

TCheckbox(
  label: 'Accept terms and conditions',
  onValueChanged: (value) => print('Checked: \$value'),
)

With Validation

TCheckbox(
  label: 'I agree to the terms',
  isRequired: true,
  rules: [
    (value) => value == true ? null : 'You must accept the terms',
  ],
)

Tristate Checkbox

TCheckbox(
  label: 'Select all',
  tristate: true,
  onValueChanged: (value) {
    // value can be true, false, or null
    print('State: \$value');
  },
)

See also:

Inheritance
Mixed-in types
Available extensions

Constructors

TCheckbox({Key? key, bool? value, ValueNotifier<bool?>? valueNotifier, ValueChanged<bool?>? onValueChanged, FocusNode? focusNode, String? label, bool isRequired = false, List<String? Function(bool?)>? rules, Duration? validationDebounce, bool autoFocus = false, bool disabled = false, Color? color, TInputSize? size = TInputSize.md, bool tristate = false, String? helperText})
Creates a checkbox input.
const

Properties

autoFocus → bool
Whether the checkbox should auto-focus.
final
color → Color?
Custom color for the checkbox.
final
disabled → bool
Whether the checkbox is disabled.
final
focusNode → FocusNode?
Custom focus node.
final
hashCode → int
The hash code for this object.
no setterinherited
helperText → String?
final
isRequired → bool
Whether this checkbox is required.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
label → String?
Label text displayed next to the checkbox.
final
onValueChanged → ValueChanged<bool?>?
Callback fired when the value changes.
final
rules → List<String? Function(bool?)>?
Validation rules for the checkbox value.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
size → TInputSize?
The size of the checkbox.
final
tristate → bool
Whether to enable tristate mode.
final
validationDebounce → Duration?
Debounce duration for validation.
final
value → bool?
The current value of the checkbox.
final
valueNotifier → ValueNotifier<bool?>?
A ValueNotifier for two-way binding.
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.
center({bool when = true}) → Widget

Available on Widget, provided by the WidgetX extension

Wraps this widget in a Center widget.
createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<TCheckbox>
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
estimateWidth(BuildContext context) → double

Available on TCheckbox, provided by the TCheckboxWidthX extension

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
validateValue(bool? value) → List<String>
Validates the given value against the rules.
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