FormMapDropdownField<TValue> class

Drop down form to select from there with Map as an option.

A form field that allows you to select Key-Value pair Map format data from a dropdown menu. Common design can be applied with FormStyle, and selection state can be managed using FormController.

Key-ValueペアのMap形式のデータをドロップダウンメニューで選択できるフォームフィールド。 FormStyleで共通したデザインを適用可能。またFormControllerを利用することで選択状態を管理できます。

Basic Usage Example 基本的な使用例

final countries = <String, String>{
  "ja": "日本語",
  "en": "English",
  "es": "Español",
  "fr": "Français",
};

FormMapDropdownField(
  form: formController,
  initialValue: formController.value.selectedLanguage,
  onSaved: (value) => formController.value.copyWith(selectedLanguage: value),
  picker: FormMapDropdownFieldPicker(
    values: countries,
  ),
);

Usage Example with Validation バリデーション付きの使用例

FormMapDropdownField(
  form: formController,
  initialValue: formController.value.selectedLanguage,
  onSaved: (value) => formController.value.copyWith(selectedLanguage: value),
  validator: (value) {
    if (value == null) {
      return "地域を選択してください";
    }
    return null;
  },
  picker: FormMapDropdownFieldPicker(
    values: countries,
  ),
);

Inheritance

Constructors

FormMapDropdownField({required FormMapDropdownFieldPicker picker, FormController<TValue>? form, Key? key, FormAffixStyle? prefix, FormAffixStyle? suffix, String? hintText, String? labelText, String? emptyErrorText, FormStyle? style, void onChanged(String? value)?, FocusNode? focusNode, bool keepAlive = true, Widget? icon, bool expanded = false, TValue onSaved(String value)?, String validator(String? value)?, String? initialValue, bool enabled = true}): Drop down form to select from there with Map as an option.

Properties

autovalidateMode → AutovalidateMode: Used to enable/disable this form field auto validation and update its error text.
finalinherited
builder → FormFieldBuilder<String>: Function that returns the widget representing this form field.
finalinherited
emptyErrorText → String?: Error text. Only displayed if no characters are entered.
final
enabled → bool: Whether the form is able to receive user input.
finalinherited
errorBuilder → FormFieldErrorBuilder?: Function that returns the widget representing the error to display.
finalinherited
expanded → bool: Extend the form.
final
focusNode → FocusNode?: Specifies the focus node.
final
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
form → FormController<TValue>?: Context for forms.
final
hashCode → int: The hash code for this object.
no setterinherited
hintText → String?: Hint to be displayed on the form. Displayed when no text is entered.
final
icon → Widget?: Specify the icon displayed on the right side of the drop-down form.
final
initialValue → String?: An optional value to initialize the form field to, or null otherwise.
finalinherited
keepAlive → bool: If placed in a list, whether or not it should not be discarded on scrolling.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
labelText → String?: Label text for forms.
final
onChanged → void Function(String? value)?: Callback to be executed each time the value is changed.
final
onReset → VoidCallback?: An optional method to call when the form field is reset via FormFieldState.reset.
finalinherited
onSaved → void Function(String? value)?: An optional method to call with the final value when the form is saved via FormState.save.
finalinherited
picker → FormMapDropdownFieldPicker: Picker object for selecting from Map.
final
prefix → FormAffixStyle?: A widget that is placed in front of the form.
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
style → FormStyle?: Form Style.
final
suffix → FormAffixStyle?: A widget that is placed after the form.
final
validator → String? Function(String? value)?: An optional method that validates an input. Returns an error string to display if the input is invalid, or null otherwise.
finalinherited

Methods

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → FormFieldState<String>: 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