ModernMemoires/lib/utils/widgets/MoodTextArea.dart

import 'package:flutter/material.dart';

class MoodTextAreaWidget extends StatefulWidget {
  final String initialText;
  final bool isDisabled;
  final bool hasPrefix;
  final bool autoFocus;
  final bool forceBlinkingCursor;

  MoodTextAreaWidget({
    Key? key,
    this.initialText = '',
    this.isDisabled = false,
    this.hasPrefix = false,
    this.autoFocus = false,
    this.forceBlinkingCursor = false,
  }) : super(key: key);

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

class _MoodTextAreaWidgetState extends State<MoodTextAreaWidget> {
  late TextEditingController _controller;
  final FocusNode _focusNode = FocusNode();
  late bool _isEditingEnabled;

  @override
  void initState() {
    super.initState();
    String initialText =
        widget.hasPrefix ? 'why? ' + widget.initialText : widget.initialText;
    _controller = TextEditingController(text: initialText);
    _isEditingEnabled = !widget.isDisabled;

    _focusNode.addListener(() {
      if (!_focusNode.hasFocus) {
        setState(() {
          // Remove cursor when focus is lost
          if (!widget.forceBlinkingCursor) {
            _controller.text = _controller.text.replaceAll('|', '');
          }
        });
      }
    });

    if (widget.autoFocus) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (_isEditingEnabled) {
          _focusNode.requestFocus();
        }
      });
    }
  }

  void enableEditing() {
    setState(() {
      _isEditingEnabled = true;
      _focusNode.requestFocus();
    });
  }

  void disableEditing() {
    setState(() {
      _isEditingEnabled = false;
      _focusNode.unfocus();
    });
  }

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: _controller,
      focusNode: _focusNode,
      keyboardType: TextInputType.multiline,
      maxLines: null,
      enabled: _isEditingEnabled,
      cursorColor:
          widget.forceBlinkingCursor ? Colors.black : Colors.transparent,
      style: TextStyle(color: Colors.black, fontSize: 18),
      decoration: InputDecoration(
        border: InputBorder.none,
      ),
      onChanged: (value) {
        if (widget.hasPrefix && !value.startsWith('why? ')) {
          _controller.text = 'why? ' + value;
          _controller.selection = TextSelection.fromPosition(
            TextPosition(offset: _controller.text.length),
          );
        }
      },
    );
  }

  @override
  void dispose() {
    _controller.dispose();
    _focusNode.dispose();
    super.dispose();
  }
}