_rule_
const uint32 B_FOLLOW_ALL_SIDES = _rule_(_VIEW_TOP_, _VIEW_LEFT_,
const uint32 B_FOLLOW_LEFT = _rule_(0, _VIEW_LEFT_, 0, _VIEW_LEFT_);
const uint32 B_FOLLOW_RIGHT = _rule_(0, _VIEW_RIGHT_, 0, _VIEW_RIGHT_);
const uint32 B_FOLLOW_LEFT_RIGHT = _rule_(0, _VIEW_LEFT_, 0, _VIEW_RIGHT_);
const uint32 B_FOLLOW_H_CENTER = _rule_(0, _VIEW_CENTER_, 0, _VIEW_CENTER_);
const uint32 B_FOLLOW_TOP = _rule_(_VIEW_TOP_, 0, _VIEW_TOP_, 0);
const uint32 B_FOLLOW_BOTTOM = _rule_(_VIEW_BOTTOM_, 0, _VIEW_BOTTOM_, 0);
const uint32 B_FOLLOW_TOP_BOTTOM = _rule_(_VIEW_TOP_, 0, _VIEW_BOTTOM_, 0);
const uint32 B_FOLLOW_V_CENTER = _rule_(_VIEW_CENTER_, 0, _VIEW_CENTER_, 0);