FormBuilderDropdown<T> class
Field for Dropdown button
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- FormField<
T> - FormBuilderField<
T> - FormBuilderFieldDecoration<
T> - FormBuilderDropdown
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, required List<DropdownMenuItem< 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, bool? enableFeedback, BorderRadius? borderRadius, AlignmentGeometry alignment = AlignmentDirectional.centerStart})T> > - 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. It is
passed the form field state as input, containing the current value and
validation state of this field.
finalinherited
- decoration → InputDecoration
-
finalinherited
- disabledHint → Widget?
-
A message to show when the dropdown is disabled.
final
- dropdownColor → Color?
-
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
- 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
- hashCode → int
-
The hash code for this object.
no setterinherited
- 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
- 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?
-
Called when the field value is reset.
finalinherited
-
onSaved
→ FormFieldSetter<
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
- 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
-
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}) → 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