Mercurial > urweb
annotate tests/dynlines.ur @ 1819:c9c38157d0d3
Merge
author | Adam Chlipala <adam@chlipala.net> |
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date | Fri, 14 Sep 2012 06:44:14 -0400 |
parents | 38297294cf98 |
children |
rev | line source |
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adam@1800 | 1 datatype lines = End | Line of source lines |
adam@1800 | 2 |
adam@1800 | 3 type t = { Head : source lines, Tail : source (source lines) } |
adam@1800 | 4 |
adam@1800 | 5 val create = |
adam@1800 | 6 head <- source End; |
adam@1800 | 7 tail <- source head; |
adam@1800 | 8 return {Head = head, Tail = tail} |
adam@1800 | 9 |
adam@1800 | 10 fun renderL lines = |
adam@1800 | 11 case lines of |
adam@1800 | 12 End => <xml/> |
adam@1800 | 13 | Line linesS => <xml>X<br/><dyn signal={renderS linesS}/></xml> |
adam@1800 | 14 |
adam@1800 | 15 and renderS linesS = |
adam@1800 | 16 lines <- signal linesS; |
adam@1800 | 17 return (renderL lines) |
adam@1800 | 18 |
adam@1800 | 19 fun render t = renderS t.Head |
adam@1800 | 20 |
adam@1800 | 21 fun write t = |
adam@1800 | 22 oldTail <- get t.Tail; |
adam@1800 | 23 newTail <- source End; |
adam@1800 | 24 set oldTail (Line newTail); |
adam@1800 | 25 set t.Tail newTail |
adam@1800 | 26 |
adam@1800 | 27 fun main () : transaction page = |
adam@1800 | 28 b <- create; |
adam@1800 | 29 |
adam@1800 | 30 return <xml><body> |
adam@1800 | 31 <button onclick={fn _ => write b}/> |
adam@1800 | 32 <dyn signal={render b}/> |
adam@1800 | 33 </body></xml> |