verticalConstraints static method

BoxConstraints verticalConstraints({ required BoxConstraints constraints, required double margin, required bool isUp, required double? top, required double? left, required double? right, required double? bottom, required Offset target, })

Implementation

static BoxConstraints verticalConstraints({
  required BoxConstraints constraints,
  required double margin,
  required bool isUp,
  required double? top,
  required double? left,
  required double? right,
  required double? bottom,
  required Offset target,
}) {
  var minHeight = constraints.minHeight;
  var maxHeight = constraints.maxHeight;
  var maxWidth = constraints.maxWidth;

  if (left != null && right != null) {
    maxWidth = maxWidth - (left + right);
  } else if ((left != null && right == null) ||
      (left == null && right != null)) {
    // make sure that the sum of left, right + maxwidth isn't bigger than the screen width.
    final sideDelta = (left ?? 0.0) + (right ?? 0.0) + margin;

    if (maxWidth > maxWidth - sideDelta) {
      maxWidth = maxWidth - sideDelta;
    }
  } else {
    if (maxWidth > maxWidth - 2 * margin) {
      maxWidth = maxWidth - 2 * margin;
    }
  }

  if (isUp) {
    if (top != null) {
      minHeight = maxHeight = target.dy - top;
    } else {
      maxHeight = min(maxHeight, target.dy) - margin;
      // TD: clamp minheight
    }
  } else {
    if (bottom != null) {
      minHeight = maxHeight = maxHeight - bottom - target.dy;
    } else {
      maxHeight = min(maxHeight, maxHeight - target.dy) - margin;
      // TD: clamp minheight
    }
  }

  return constraints.copyWith(
    minHeight: minHeight,
    maxHeight: maxHeight,
    maxWidth: maxWidth,
  );
}