Mercurial > gui
annotate sourceL.ur @ 30:c1f06342c81f
Add margin example
| author | Adam Chlipala <adam@chlipala.net> |
|---|---|
| date | Sat, 12 May 2012 10:07:45 -0400 |
| parents | 8300d5f0dc19 |
| children |
| rev | line source |
|---|---|
| adam@15 | 1 con t a = {Source : source a, |
| adam@15 | 2 OnSet : source (a -> transaction {})} |
| kkallio@14 | 3 |
| adam@15 | 4 fun create [a] (i : a) = |
| adam@15 | 5 s <- source i; |
| adam@15 | 6 f <- source (fn _ => return ()); |
| kkallio@14 | 7 |
| adam@15 | 8 return {Source = s, |
| adam@15 | 9 OnSet = f} |
| kkallio@14 | 10 |
| adam@15 | 11 fun onChange [a] (t : t a) f = |
| adam@15 | 12 old <- get t.OnSet; |
| adam@15 | 13 set t.OnSet (fn x => (old x; f x)) |
| kkallio@14 | 14 |
| adam@15 | 15 fun set [a] (t : t a) (v : a) = |
| adam@15 | 16 Basis.set t.Source v; |
| adam@15 | 17 f <- get t.OnSet; |
| adam@15 | 18 f v |
| kkallio@14 | 19 |
| adam@15 | 20 fun get [a] (t : t a) = Basis.get t.Source |
| kkallio@14 | 21 |
| adam@15 | 22 fun value [a] (t : t a) = signal t.Source |