updateField method

Implementation

void updateField() async {
  // Store current cursor position.

  _previousSelection = widget.controller.selection;

  String updatedText = widget.controller.text;
  num? v = num.tryParse(updatedText);

  if (v == null) {
    // If the parsing fails, set to 0 or min.

    v = widget.min ?? 0;
  } else {
    // Apply min and max constraints.

    if (widget.min != null) {
      v = max(v, widget.min!);
    }
    if (widget.max != null) {
      v = min(v, widget.max!);
    }
  }

  // Controller text automatically updates to
  // the range of [widget.min] and [widget.max].

  widget.controller.text = v.toString();

  // Apply decimal places if needed.

  if (widget.decimalPlaces > 0) {
    v = double.parse(v.toStringAsFixed(widget.decimalPlaces));
  }

  _isInternalChange = true;

  // Update the state.

  ref.read(widget.stateProvider.notifier).state = v;

  // Save to SharedPreferences if key is provided.

  if (widget.sharedPrefsKey != null) {
    await _saveToSharedPrefs(v);
  }

  // Call onValueChanged callback if provided.

  if (widget.onValueChanged != null) {
    await widget.onValueChanged!(v.toString());
  }

  // Restore cursor position if needed.

  if (_previousSelection != null && _focusNode.hasFocus) {
    widget.controller.selection = TextSelection.collapsed(
      offset: min(
        _previousSelection!.baseOffset,
        widget.controller.text.length,
      ),
    );
  }

  // Trigger the callback after all updates are done.

  _triggerUpDownCallback();

  _isInternalChange = false;
}