FormBuilderDropdown<T> class

Field for Dropdown button

Inheritance

Constructors

FormBuilderDropdown({Key? key, required String name, FormFieldValidator<T>? validator, T? initialValue, InputDecoration decoration = const InputDecoration(), ValueChanged<T?>? onChanged, ValueTransformer<T?>? valueTransformer, bool enabled = true, FormFieldSetter<T>? onSaved, AutovalidateMode? autovalidateMode = AutovalidateMode.disabled, VoidCallback? onReset, FocusNode? focusNode, String? restorationId, FormFieldErrorBuilder? errorBuilder, required List<DropdownMenuItem<T>> items, bool isExpanded = true, bool isDense = true, int elevation = 8, double iconSize = 24.0, TextStyle? style, Widget? disabledHint, Widget? icon, Color? iconDisabledColor, Color? iconEnabledColor, VoidCallback? onTap, bool autofocus = false, Color? dropdownColor, Color? focusColor, double? itemHeight, DropdownButtonBuilder? selectedItemBuilder, double? menuMaxHeight, bool? enableFeedback, BorderRadius? borderRadius, AlignmentGeometry alignment = AlignmentDirectional.centerStart, Widget? hint, Widget? underline = const SizedBox.shrink(), EdgeInsetsGeometry? padding, double? menuWidth})
Creates field for Dropdown button

Properties

alignment → AlignmentGeometry
Defines how the hint or the selected item is positioned within the button.
final
autofocus → bool
True if this widget will be selected as the initial focus when no other node in its scope is currently focused.
final
autovalidateMode → AutovalidateMode
Used to enable/disable this form field auto validation and update its error text.
finalinherited
borderRadius → BorderRadius?
Defines the corner radii of the menu's rounded rectangle shape.
final
builder → FormFieldBuilder<T>
Function that returns the widget representing this form field.
finalinherited
decoration → InputDecoration
finalinherited
disabledHint → Widget?
A message to show when the dropdown is disabled.
final
The background color of the dropdown.
final
elevation → int
The z-coordinate at which to place the menu when open.
final
enabled → bool
Whether the form is able to receive user input.
finalinherited
enableFeedback → bool?
Whether detected gestures should provide acoustic and/or haptic feedback.
final
errorBuilder → FormFieldErrorBuilder?
Function that returns the widget representing the error to display.
finalinherited
focusColor → Color?
The color for the button's Material when it has the input focus.
final
focusNode → FocusNode?
An optional focus node to use as the focus node for this widget.
finalinherited
forceErrorText → String?
An optional property that forces the FormFieldState into an error state by directly setting the FormFieldState.errorText property without running the validator function.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
hint → Widget?
A placeholder widget that is displayed by the dropdown button.
final
icon → Widget?
The widget to use for the drop-down button's icon.
final
iconDisabledColor → Color?
The color of any Icon descendant of icon if this button is disabled, i.e. if onChanged is null.
final
iconEnabledColor → Color?
The color of any Icon descendant of icon if this button is enabled, i.e. if onChanged is defined.
final
iconSize → double
The size to use for the drop-down button's down arrow icon button.
final
initialValue → T?
An optional value to initialize the form field to, or null otherwise.
finalinherited
isDense → bool
Reduce the button's height.
final
isExpanded → bool
Set the dropdown's inner contents to horizontally fill its parent.
final
itemHeight → double?
If null, then the menu item heights will vary according to each menu item's intrinsic height.
final
items → List<DropdownMenuItem<T>>
The list of items the user can select.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
The maximum height of the menu.
final
The width of the menu.
final
name → String
Used to reference the field within the form, or to reference form data after the form is submitted.
finalinherited
onChanged → ValueChanged<T?>?
Called when the field value is changed.
finalinherited
onReset → VoidCallback?
An optional method to call when the form field is reset via FormFieldState.reset.
finalinherited
onSaved → ValueChanged<T?>?
An optional method to call with the final value when the form is saved via FormState.save.
finalinherited
onTap → VoidCallback?
Called when the dropdown button is tapped.
final
padding → EdgeInsetsGeometry?
Padding around the visible portion of the dropdown widget.
final
restorationId → String?
Restoration ID to save and restore the state of the form field.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selectedItemBuilder → DropdownButtonBuilder?
A builder to customize the dropdown buttons corresponding to the DropdownMenuItems in items.
final
style → TextStyle?
The text style to use for text in the dropdown button and the dropdown menu that appears when you tap the button.
final
underline → Widget?
The widget to use for drawing the drop-down button's underline.
final
validator → FormFieldValidator<T>?
An optional method that validates an input. Returns an error string to display if the input is invalid, or null otherwise.
finalinherited
valueTransformer → ValueTransformer<T?>?
Called just before field value is saved. Used to massage data just before committing the value.
finalinherited

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → FormBuilderFieldDecorationState<FormBuilderDropdown<T>, T>
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
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