flutter_app/lib/widgets/textfield.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../settings.dart';

doNothing(String x) {}

// Provides a styled Text Field for use in Form Widgets.
// Callers must provide a text controller, label helper text and a validator.
class CwtchTextField extends StatefulWidget {
  CwtchTextField({required this.controller, required this.labelText, this.validator, this.autofocus = false, this.onChanged = doNothing});
  final TextEditingController controller;
  final String labelText;
  final FormFieldValidator? validator;
  final Function(String) onChanged;
  final bool autofocus;

  @override
  _CwtchTextFieldState createState() => _CwtchTextFieldState();
}

class _CwtchTextFieldState extends State<CwtchTextField> {
  late final FocusNode _focusNode;

  @override
  void initState() {
    _focusNode = FocusNode();
    _focusNode.addListener(() {
      // Select all...
      if (_focusNode.hasFocus) widget.controller.selection = TextSelection(baseOffset: 0, extentOffset: widget.controller.text.length);
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<Settings>(builder: (context, theme, child) {
      return TextFormField(
        controller: widget.controller,
        validator: widget.validator,
        onChanged: widget.onChanged,
        autofocus: widget.autofocus,
        focusNode: _focusNode,
        decoration: InputDecoration(
            labelText: widget.labelText,
            labelStyle: TextStyle(color: theme.current().mainTextColor(), backgroundColor: theme.current().textfieldBackgroundColor()),
            floatingLabelBehavior: FloatingLabelBehavior.never,
            filled: true,
            focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(15.0), borderSide: BorderSide(color: theme.current().textfieldBorderColor(), width: 3.0)),
            focusedErrorBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(15.0), borderSide: BorderSide(color: theme.current().textfieldErrorColor(), width: 3.0)),
            errorBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(15.0), borderSide: BorderSide(color: theme.current().textfieldErrorColor(), width: 3.0)),
            errorStyle: TextStyle(
              color: theme.current().textfieldErrorColor(),
              fontWeight: FontWeight.bold,
            ),
            fillColor: theme.current().textfieldBackgroundColor(),
            contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
            enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(15.0), borderSide: BorderSide(color: theme.current().textfieldBorderColor(), width: 3.0))),
      );
    });
  }
}