ModernMemoires/lib/views/write_page/widget/why_widget.dart

import 'package:flutter/material.dart';

class WhyWidget extends StatefulWidget {
  final TextEditingController controller;

  WhyWidget({Key? key, required this.controller}) : super(key: key);

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

class _WhyWidgetState extends State<WhyWidget> {
  final TextEditingController _controller =
      TextEditingController(text: "why? ");
  final FocusNode _focusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    _focusNode.addListener(() {
      if (!_focusNode.hasFocus) {
        setState(() {
          // Remove cursor when focus is lost
          _controller.text = _controller.text.replaceAll('|', '');
        });
      }
    });

    // Automatically focus the TextField and open the keyboard when the widget builds
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _focusNode.requestFocus();
    });
  }

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: _controller,
      focusNode: _focusNode,
      keyboardType: TextInputType.multiline,
      maxLines: null, // Allow for unlimited lines
      cursorColor: Colors.transparent, // Hide the default cursor
      style: TextStyle(color: Colors.black, fontSize: 18),
      decoration: InputDecoration(
        border: InputBorder.none, // Make the TextField borderless
      ),
      onChanged: (value) {
        // Ensure "why? " is always at the start
        if (!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();
  }
}