Ur/Web: demo/more/dragList.ur annotate

Better discovery of type class instances from recursive definitions

author	Adam Chlipala <adam@chlipala.net>
date	Wed, 02 May 2012 08:34:50 -0400
parents	6a77c3e33908
children	e6bc6bbd7a32

rev	line source
adamc@916	1 fun draggableList title items =
adamc@916	2 itemSources <- List.mapM source items;
adamc@916	3 draggingItem <- source None;
adamc@916	4 return <xml>
adamc@916	5 <h2>Great {[title]}</h2>
adamc@916	6 <ul>
adamc@916	7 {List.mapX (fn itemSource => <xml>
adamc@916	8 <li onmousedown={set draggingItem (Some itemSource)}
adamc@916	9 onmouseup={set draggingItem None}
adamc@916	10 onmouseover={di <- get draggingItem;
adamc@916	11 case di of
adamc@916	12 None => return ()
adamc@917	13 \| Some di => original <- get di;
adamc@917	14 movedOver <- get itemSource;
adamc@917	15 set di movedOver;
adamc@917	16 set itemSource original;
adamc@917	17 set draggingItem (Some itemSource)}>
adamc@918	18 <dyn signal={Monad.mp cdata (signal itemSource)}/>
adamc@916	19 </li></xml>) itemSources}
adamc@916	20 </ul>
adamc@916	21 </xml>
adamc@916	22
adamc@916	23 fun main () =
adamc@916	24 bears <- draggableList "Bears" ("Pooh" :: "Paddington" :: "Rupert" :: "Edward" :: []);
adamc@916	25 beers <- draggableList "Beers" ("Budvar" :: "Delirium Tremens" :: "Deuchars" :: []);
adamc@916	26 boars <- draggableList "Boars" ("Sus scrofa scrofa"
adamc@916	27 :: "Sus scrofa ussuricus"
adamc@916	28 :: "Sus scrofa cristatus"
adamc@916	29 :: "Sus scrofa taiwanus" :: []);
adamc@917	30 return <xml>
adamc@917	31 <head>
adamc@917	32 <link rel="stylesheet" type="text/css" href="../../dragList.css"/>
adamc@917	33 </head>
adamc@917	34 <body>
adamc@917	35 {bears}
adamc@917	36 {beers}
adamc@917	37 {boars}
adamc@917	38 </body>
adamc@917	39 </xml>

Mercurial > urweb