detach method
override
Mark this render object as detached from its PipelineOwner.
Typically called only from the parent's detach, and by the owner to mark the root of a tree as detached.
Subclasses with children should override this method to
detach all their children after calling the inherited method,
as in super.detach()
.
Implementation
@override
void detach() {
_tap.dispose();
_longPress.dispose();
_offset.removeListener(markNeedsPaint);
_showCursor.removeListener(_showHideCursor);
super.detach();
_foregroundRenderObject?.detach();
_backgroundRenderObject?.detach();
}