notifyListeners method

@pragma('vm:notify-debugger-on-exception') void notifyListeners()

Implementation

@pragma('vm:notify-debugger-on-exception')
void notifyListeners() {
  _garbageCollect();

  if (_count == 0) {
    return;
  }

  // Call all listeners anc calculate the call stack depth, in case of
  // recursive calling.
  _notificationCallStackDepth++;
  final end = _count;
  for (var i = 0; i < end; i++) {
    try {
      _listeners[i]?.target?.call();
    } catch (exception, stack) {
      FlutterError.reportError(
        FlutterErrorDetails(
          exception: exception,
          stack: stack,
          library: 'DF Pod',
          context: ErrorDescription(
            'while dispatching notifications for $runtimeType',
          ),
          informationCollector: () => <DiagnosticsNode>[
            DiagnosticsProperty<WeakChangeNotifier>(
              'The $runtimeType sending notification was',
              this,
              style: DiagnosticsTreeStyle.errorProperty,
            ),
          ],
        ),
      );
    }
  }
  _notificationCallStackDepth--;

  // Remove listeners scheduled for removal by [removeListener].
  if (_notificationCallStackDepth == 0 && _reentrantlyRemovedListeners > 0) {
    final newLength = _count - _reentrantlyRemovedListeners;
    if (newLength * 2 <= _listeners.length) {
      final newListeners =
          List<WeakReference<VoidCallback>?>.filled(newLength, null);
      var newIndex = 0;
      for (var i = 0; i < _count; i++) {
        final listener = _listeners[i];
        if (listener != null) {
          newListeners[newIndex++] = listener;
        }
      }
      _listeners = newListeners;
    } else {
      for (var i = 0; i < newLength; i += 1) {
        if (_listeners[i] == null) {
          var swapIndex = i + 1;
          while (_listeners[swapIndex] == null) {
            swapIndex += 1;
          }
          _listeners[i] = _listeners[swapIndex];
          _listeners[swapIndex] = null;
        }
      }
    }
    _reentrantlyRemovedListeners = 0;
    _count = newLength;
  }
}