getHitTestRect method
Implementation
Rect getHitTestRect(Offset offset) {
Rect rect = offset & size;
rect = Rect.fromPoints(
Offset(
rect.left - extraHitTestArea.left, rect.top - extraHitTestArea.top),
Offset(rect.right + extraHitTestArea.right,
rect.bottom + extraHitTestArea.bottom),
);
return rect;
}