app-zj/lib/widget/password_textformfield.dart

import 'dart:ui' as ui show BoxHeightStyle, BoxWidthStyle;

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:lszlgl/widget/password_textfield.dart';

/// A [FormField] that contains a [PasswordTextField].
/// If you want to see the details of the API, check the [TextFormField].
///
/// It has almost the same API as [TextFormField], so it can be replaced.
class PasswordTextFormField extends FormField<String> {
  /// Creates a [FormField] that contains a [PasswordTextField].
  PasswordTextFormField({
    super.key,
    IconData visibleIcon = Icons.remove_red_eye_outlined,
    IconData inVisibleIcon = Icons.remove_red_eye_outlined,
    bool initialObscurity = true,
    this.controller,
    String? initialValue,
    FocusNode? focusNode,
    InputDecoration? decoration = const InputDecoration(),
    TextInputType? keyboardType,
    TextCapitalization textCapitalization = TextCapitalization.none,
    TextInputAction? textInputAction,
    TextStyle? style,
    StrutStyle? strutStyle,
    TextDirection? textDirection,
    TextAlign textAlign = TextAlign.start,
    TextAlignVertical? textAlignVertical,
    bool autofocus = false,
    bool readOnly = false,
    bool? showCursor,
    String obscuringCharacter = '•',
    bool obscureText = false,
    bool autocorrect = true,
    SmartDashesType? smartDashesType,
    SmartQuotesType? smartQuotesType,
    bool enableSuggestions = true,
    MaxLengthEnforcement? maxLengthEnforcement,
    int? maxLines = 1,
    int? minLines,
    bool expands = false,
    int? maxLength,
    ValueChanged<String>? onChanged,
    GestureTapCallback? onTap,
    TapRegionCallback? onTapOutside,
    VoidCallback? onEditingComplete,
    ValueChanged<String>? onFieldSubmitted,
    super.onSaved,
    super.validator,
    List<TextInputFormatter>? inputFormatters,
    bool? enabled,
    double cursorWidth = 2.0,
    double? cursorHeight,
    Radius? cursorRadius,
    Color? cursorColor,
    Brightness? keyboardAppearance,
    EdgeInsets scrollPadding = const EdgeInsets.all(20.0),
    bool? enableInteractiveSelection,
    TextSelectionControls? selectionControls,
    InputCounterWidgetBuilder? buildCounter,
    ScrollPhysics? scrollPhysics,
    Iterable<String>? autofillHints,
    AutovalidateMode? autovalidateMode,
    ScrollController? scrollController,
    super.restorationId,
    bool enableIMEPersonalizedLearning = true,
    MouseCursor? mouseCursor,
    EditableTextContextMenuBuilder? contextMenuBuilder =
        _defaultContextMenuBuilder,
    SpellCheckConfiguration? spellCheckConfiguration,
    TextMagnifierConfiguration? magnifierConfiguration,
    UndoHistoryController? undoController,
    AppPrivateCommandCallback? onAppPrivateCommand,
    bool? cursorOpacityAnimates,
    ui.BoxHeightStyle selectionHeightStyle = ui.BoxHeightStyle.tight,
    ui.BoxWidthStyle selectionWidthStyle = ui.BoxWidthStyle.tight,
    DragStartBehavior dragStartBehavior = DragStartBehavior.start,
    ContentInsertionConfiguration? contentInsertionConfiguration,
    Clip clipBehavior = Clip.hardEdge,
    bool scribbleEnabled = true,
    bool canRequestFocus = true,
  }) : super(
    initialValue:
    controller != null ? controller.text : (initialValue ?? ''),
    enabled: enabled ?? decoration?.enabled ?? true,
    autovalidateMode: autovalidateMode ?? AutovalidateMode.disabled,
    builder: (FormFieldState<String> field) {
      final _PasswordTextFormFieldState state =
      field as _PasswordTextFormFieldState;
      final InputDecoration effectiveDecoration = (decoration ??
          const InputDecoration())
          .applyDefaults(Theme.of(field.context).inputDecorationTheme);
      void onChangedHandler(String value) {
        field.didChange(value);
        if (onChanged != null) {
          onChanged(value);
        }
      }

      return UnmanagedRestorationScope(
        bucket: field.bucket,
        child: PasswordTextField(
          visibleIcon: visibleIcon,
          inVisibleIcon: inVisibleIcon,
          initialObscurity: initialObscurity,
          restorationId: restorationId,
          controller: state._effectiveController,
          focusNode: focusNode,
          decoration:
          effectiveDecoration.copyWith(errorText: field.errorText),
          keyboardType: keyboardType,
          textInputAction: textInputAction,
          style: style,
          strutStyle: strutStyle,
          textAlign: textAlign,
          textAlignVertical: textAlignVertical,
          textDirection: textDirection,
          textCapitalization: textCapitalization,
          autofocus: autofocus,
          readOnly: readOnly,
          showCursor: showCursor,
          obscuringCharacter: obscuringCharacter,
          autocorrect: autocorrect,
          enableSuggestions: enableSuggestions,
          maxLengthEnforcement: maxLengthEnforcement,
          maxLines: maxLines,
          minLines: minLines,
          expands: expands,
          maxLength: maxLength,
          onChanged: onChangedHandler,
          onTap: onTap,
          onTapOutside: onTapOutside,
          onEditingComplete: onEditingComplete,
          onSubmitted: onFieldSubmitted,
          inputFormatters: inputFormatters,
          enabled: enabled ?? decoration?.enabled ?? true,
          cursorWidth: cursorWidth,
          cursorHeight: cursorHeight,
          cursorRadius: cursorRadius,
          cursorColor: cursorColor,
          scrollPadding: scrollPadding,
          scrollPhysics: scrollPhysics,
          keyboardAppearance: keyboardAppearance,
          enableInteractiveSelection:
          enableInteractiveSelection ?? (!obscureText || !readOnly),
          selectionControls: selectionControls,
          buildCounter: buildCounter,
          autofillHints: autofillHints,
          scrollController: scrollController,
          enableIMEPersonalizedLearning: enableIMEPersonalizedLearning,
          mouseCursor: mouseCursor,
          contextMenuBuilder: contextMenuBuilder,
          spellCheckConfiguration: spellCheckConfiguration,
          magnifierConfiguration: magnifierConfiguration,
          undoController: undoController,
          onAppPrivateCommand: onAppPrivateCommand,
          cursorOpacityAnimates: cursorOpacityAnimates,
          selectionHeightStyle: selectionHeightStyle,
          selectionWidthStyle: selectionWidthStyle,
          dragStartBehavior: dragStartBehavior,
          contentInsertionConfiguration: contentInsertionConfiguration,
          clipBehavior: clipBehavior,
          scribbleEnabled: scribbleEnabled,
          canRequestFocus: canRequestFocus,
        ),
      );
    },
  );

  /// Controls the text being edited.
  ///
  /// If null, this widget will create its own [TextEditingController] and
  /// initialize its [TextEditingController.text] with [initialValue].
  final TextEditingController? controller;

  static Widget _defaultContextMenuBuilder(
      BuildContext context, EditableTextState editableTextState) {
    return AdaptiveTextSelectionToolbar.editableText(
      editableTextState: editableTextState,
    );
  }

  @override
  FormFieldState<String> createState() => _PasswordTextFormFieldState();
}

/// see [TextFormField] & [_TextFormFieldState]
class _PasswordTextFormFieldState extends FormFieldState<String> {
  RestorableTextEditingController? _controller;

  TextEditingController get _effectiveController =>
      _textFormField.controller ?? _controller!.value;

  PasswordTextFormField get _textFormField =>
      super.widget as PasswordTextFormField;

  @override
  void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
    super.restoreState(oldBucket, initialRestore);
    if (_controller != null) {
      _registerController();
    }
    // Make sure to update the internal [FormFieldState] value to sync up with
    // text editing controller value.
    setValue(_effectiveController.text);
  }

  void _registerController() {
    assert(_controller != null);
    registerForRestoration(_controller!, 'controller');
  }

  void _createLocalController([TextEditingValue? value]) {
    assert(_controller == null);
    _controller = value == null
        ? RestorableTextEditingController()
        : RestorableTextEditingController.fromValue(value);
    if (!restorePending) {
      _registerController();
    }
  }

  @override
  void initState() {
    super.initState();
    if (_textFormField.controller == null) {
      _createLocalController(widget.initialValue != null
          ? TextEditingValue(text: widget.initialValue!)
          : null);
    } else {
      _textFormField.controller!.addListener(_handleControllerChanged);
    }
  }

  @override
  void didUpdateWidget(PasswordTextFormField oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (_textFormField.controller != oldWidget.controller) {
      oldWidget.controller?.removeListener(_handleControllerChanged);
      _textFormField.controller?.addListener(_handleControllerChanged);

      if (oldWidget.controller != null && _textFormField.controller == null) {
        _createLocalController(oldWidget.controller!.value);
      }

      if (_textFormField.controller != null) {
        setValue(_textFormField.controller!.text);
        if (oldWidget.controller == null) {
          unregisterFromRestoration(_controller!);
          _controller!.dispose();
          _controller = null;
        }
      }
    }
  }

  @override
  void dispose() {
    _textFormField.controller?.removeListener(_handleControllerChanged);
    _controller?.dispose();
    super.dispose();
  }

  @override
  void didChange(String? value) {
    super.didChange(value);

    if (_effectiveController.text != value) {
      _effectiveController.text = value ?? '';
    }
  }

  @override
  void reset() {
    // setState will be called in the superclass, so even though state is being
    // manipulated, no setState call is needed here.
    _effectiveController.text = widget.initialValue ?? '';
    super.reset();
  }

  void _handleControllerChanged() {
    // Suppress changes that originated from within this class.
    //
    // In the case where a controller has been passed in to this widget, we
    // register this change listener. In these cases, we'll also receive change
    // notifications for changes originating from within this class -- for
    // example, the reset() method. In such cases, the FormField value will
    // already have been set.
    if (_effectiveController.text != value) {
      didChange(_effectiveController.text);
    }
  }
}