location2025/lib/module/news/news_report/news_repost_text_view.dart

import 'package:flutter/material.dart';
import 'package:location/utils/common_expand.dart';

class NewsRepostTextView extends StatefulWidget {
  final String? initialValue; // 初始值
  final String hintText; // 提示文本
  final TextEditingController controller;
  final ValueChanged<String>? onChanged; // 文本变化回调
  final VoidCallback? onSubmitted; // 提交回调
  final int minLength; // 最小字数
  final int maxLength; // 最大字数

  const NewsRepostTextView({
    Key? key,
    this.initialValue,
    required this.controller,
    this.hintText = '请输入举报原因，确保您提交的信息真实、客观，且符合中华人民共和国相关法律法规。我们将由专门的审核团队对您提供的内容进行核查并第一时间处理。',
    this.onChanged,
    this.onSubmitted,
    this.minLength = 3,
    this.maxLength = 500,
  }) : super(key: key);

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

class _NewsRepostTextViewState extends State<NewsRepostTextView> {
  late TextEditingController _controller;
  late FocusNode _focusNode;
  bool _isValid = true; // 当前输入是否有效
  int _currentLength = 0; // 当前字数

  @override
  void initState() {
    super.initState();
    _controller = widget.controller;//TextEditingController(text: widget.initialValue);
    _focusNode = FocusNode();
    _currentLength = widget.initialValue?.length ?? 0;
    _validateText();

    // 监听文本变化
    _controller.addListener(() {
      setState(() {
        _currentLength = _controller.text.length;
        _validateText();
        widget.onChanged?.call(_controller.text);
      });
    });
  }

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

  // 验证文本长度
  void _validateText() {
    final text = _controller.text;
    _isValid = text.length >= widget.minLength && text.length <= widget.maxLength;
  }

  // 获取当前文本状态的提示信息
  String get _lengthStatusText {
    if (_currentLength < widget.minLength) {
      return '至少输入${widget.minLength}个字';
    } else if (_currentLength >= widget.maxLength) {
      return '已超出最大字数限制';
    } else {
      return '${_currentLength}/${widget.maxLength}';
    }
  }

  // 获取当前文本状态的颜色
  Color get _lengthStatusColor {
    if (_currentLength < widget.minLength || _currentLength > widget.maxLength) {
      return Colors.red;
    } else {
      return Colors.grey;
    }
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        // 点击时收起键盘
        FocusScopeNode currentFocus = FocusScope.of(context);
        if (!currentFocus.hasPrimaryFocus && currentFocus.focusedChild != null) {
          FocusManager.instance.primaryFocus?.unfocus();
        }
      },
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          TextField(
            controller: _controller,
            focusNode: _focusNode,
            maxLines: null, // 允许多行输入
            minLines: 4, // 最小显示行数
            maxLength: widget.maxLength, // 最大字数限制（UI层限制）
            keyboardType: TextInputType.multiline,
            decoration: InputDecoration(
              hintText: widget.hintText,
              hintStyle: TextStyle(
                color: Colors.grey
              ),
              border:  OutlineInputBorder(
                borderSide: BorderSide(
                  color: "#12C2C2C2".color,
                  width: 1.0,
                ),
              ),
              enabledBorder:  OutlineInputBorder(
                borderSide: BorderSide(
                  color: "#12C2C2C2".color,
                  width: 1.0,
                ),
              ),
              focusedBorder: OutlineInputBorder(
                  borderSide: BorderSide(
                    color: _isValid ? "#12C2C2C2".color : Colors.red,
                    width: 2.0,
                  ),
                  borderRadius: BorderRadius.all(Radius.circular(10))
              ),
              counterText: '', // 隐藏默认计数器
            ),
            onSubmitted: (_) => widget.onSubmitted?.call(),
          ),
          SizedBox(height: 8.0),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                _lengthStatusText,
                style: TextStyle(color: _lengthStatusColor),
              ),
              if (!_isValid)
                Text(
                  '字数不符合要求',
                  style: TextStyle(color: Colors.red),
                ),
            ],
          ),
        ],
      ),
    );


  }
}