horizontalPositionDependentBox function

Offset horizontalPositionDependentBox({ required Size size, required Size childSize, required Offset target, required bool preferLeft, double horizontalOffset = 0.0, double margin = 10.0, })

Implementation

Offset horizontalPositionDependentBox({
  required Size size,
  required Size childSize,
  required Offset target,
  required bool preferLeft,
  double horizontalOffset = 0.0,
  double margin = 10.0,
}) {
  // Horizontal DIRECTION
  final fitsLeft =
      target.dx + horizontalOffset + childSize.width <= size.width - margin;
  final fitsRight = target.dx - horizontalOffset - childSize.width >= margin;
  final tooltipLeft =
      preferLeft ? fitsLeft || !fitsRight : !(fitsRight || !fitsLeft);
  double x;
  if (tooltipLeft) {
    x = math.min(target.dx + horizontalOffset, size.width - margin);
  } else {
    x = math.max(target.dx - horizontalOffset - childSize.width, margin);
  }
  // Vertical DIRECTION
  double y;
  if (size.height - margin * 2.0 < childSize.height) {
    y = (size.height - childSize.height) / 2.0;
  } else {
    final normalizedTargetY = target.dy.clamp(margin, size.height - margin);
    final edge = margin + childSize.height / 2.0;
    if (normalizedTargetY < edge) {
      y = margin;
    } else if (normalizedTargetY > size.height - edge) {
      y = size.height - margin - childSize.height;
    } else {
      y = normalizedTargetY - childSize.height / 2.0;
    }
  }
  return Offset(x, y);
}