Strut(void): top(0), bottom(0), left(0), right(0) {}
//! Constructs a new Strut with margins
Strut(int l, int t, int r, int b): top(t), bottom(b), left(l), right(r) {}
Strut(void): top(0), bottom(0), left(0), right(0) {}
//! Constructs a new Strut with margins
Strut(int l, int t, int r, int b): top(t), bottom(b), left(l), right(r) {}