Flutter TextField处理Zebra条码扫描器快速输入丢字符问题求助

• 使用Zebra DS2208手持条码扫描器扫描Code-128码制条码，通过监听键盘输入实现功能，多数情况正常，但扫描如#COUNTING-TEST-TEST这类条码时偶尔丢字符，结果变成#COUN-T
• 设备为亚马逊Fire平板，桌面端扫描完全正常
• 尝试过的方案：stream_transform包、队列、缓冲区，以及针对Android平台注册原生EditText（该方式能很好处理快速输入，但存在其他问题）

自定义TextField代码 #

class CustomTextFieldState extends State<CustomTextField> {
  String _inputBuffer = ''; // Buffer to accumulate input
  Timer? _bufferTimer; // Timer for clearing buffer

  // Method to manually trigger onSubmitted
  void submit() {
    if (widget.onSubmitted != null) {
      widget.onSubmitted!(widget.controller.text);
      widget.controller.clear();
      _inputBuffer = "";
      widget.focusNode.requestFocus();
    }
  }

  KeyEventResult _handleKeyEvent(FocusNode node, KeyEvent event) {
    if (event is KeyDownEvent) {
      final LogicalKeyboardKey logicalKey = event.logicalKey;
      final String key = event.character ?? '';

      // Handle Enter key only when LogicalKeyboardKey.enter is pressed
      if (logicalKey == LogicalKeyboardKey.enter) { 
        // Call onSubmitted with buffered input
        widget.onSubmitted?.call(_inputBuffer);
        
        // Clear the controller text and input buffer
        widget.controller.clear();
        _inputBuffer = ''; 
        widget.focusNode.requestFocus();
        return KeyEventResult.handled;
      }

      // Handle Backspace key
      else if (logicalKey == LogicalKeyboardKey.backspace) {
        if (_inputBuffer.isNotEmpty) {
          // Remove the last character from the buffer
          _inputBuffer = _inputBuffer.substring(0, _inputBuffer.length - 1);
          widget.controller.text = _inputBuffer;
        }
        return KeyEventResult.handled;
      }

      // Handle normal characters: add them to the buffer and update the controller
      else if (key.isNotEmpty && key.length == 1) {
        // Add the character to the buffer and update the controller text
        _inputBuffer += key;
        widget.controller.text = _inputBuffer;  // Reflect the key in the text field
        return KeyEventResult.handled;
      }
    }
    return KeyEventResult.ignored;
  }

  void _resetBufferTimer() {
    _bufferTimer?.cancel();
    _bufferTimer = Timer(widget.bufferDuration, () {
      setState(() {
        _inputBuffer = ''; // Clear buffer if no input for bufferDuration
      });
    });
  }

  @override
  void dispose() {
    _bufferTimer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Focus(
      focusNode: widget.focusNode,
      onKeyEvent: _handleKeyEvent, // Handle key events here
      child: TextField(
        autocorrect: false,
        autofocus: true,
        textInputAction: TextInputAction.done,
        controller: widget.controller,
        textCapitalization: TextCapitalization.none,
        decoration: InputDecoration(
          labelText: widget.labelText,
          border: const OutlineInputBorder(),
          prefixIcon: IconButton(
            icon: Icon(Icons.clear),
            onPressed: () {
              widget.controller.clear();
              setState(() {
                _inputBuffer = ''; // Clear the buffer as well
              });
            },
          )
        ),
        
      ),
    );
  }
}

请问有人成功解决过这个问题吗？

内容的提问来源于stack exchange，提问作者Cody