calculateReactionsHorizontalAlignment function

double calculateReactionsHorizontalAlignment(Customer? user, Message message, BoxConstraints constraints, double? fontSize, Orientation orientation,)

This method calculates the align that the modal of reactions should have. This is an approximation based on the size of the message and the available space in the screen.

Implementation

double calculateReactionsHorizontalAlignment(
  Customer? user,
  Message message,
  BoxConstraints constraints,
  double? fontSize,
  Orientation orientation,
) {
  // divFactor is the percentage of the available space that the message takes.
  // When the divFactor is bigger than 0.5 that means that the messages is
  // bigger than 50% of the available space and the modal should have an offset
  // in the direction that the message grows. When the divFactor is smaller
  // than 0.5 then the offset should be to he side opposite of the message
  // growth.
  // In resume, when divFactor > 0.5 then result > 0, when divFactor < 0.5
  // then result < 0.
  var divFactor = 0.5;

  final signal = user?.id == message.sender?.id ? 1 : -1;
  final result = signal * (1 - divFactor * 2.0);

  // Ensure reactions don't get pushed past the edge of the screen.
  //
  // This happens if divFactor is really big. When this happens, we can simply
  // move the model all the way to the end of screen.
  return result.clamp(-1, 1);
}