Every once in a while the blind squirrel finds the nut. First, to get a
taste for what I’m implementing in Elm, hit:
www.deepfinesse.com/demo
Then hit the GO button, then the rotate icon a few times. It’s a bridge
playing game.
I began developing this in 0.16 and have it ported to 0.17. I was somewhat
on the fence about whether to implement this using Elm’s HTML modules or as
pure graphics via the Element / Collage modules. Since it really is all
graphics ala Mario and Pong, I went with Element / Collage, as those
programs did.
All was fine until the Touch.elm package disappeared in 0.17. This meant
my app no longer worked on my iPhone - a major target for it. I found a
reference on how to do touching in 0.17 but it was HTML based so I could
not really leverage.
Completely befuddled about what to do, I took a look inside core/Mouse.elm
to see if I could replicate it in a new Touch.elm module. Despite having
gotten pretty strong with Elm at an application level, I have to say the
contents of Mouse.elm was almost entirely French to me. AFAIK there is no
manual on how all that Effects magic works.
Now for the blind squirrel part. I edited core/Mouse.elm directly in my
elm-stuff folder, adding only this:
touches : (Position -> msg) -> Sub msg
touches tagger =
subscription (MySub "touchend" tagger)
Then added the necessary boiler plate to my app:
type Msg = WinResize Window.Size
| MouseClick Mouse.Position
| TouchEnd Mouse.Position <- ADDED
update msg model =
case msg of
WinResize newSize ->
resizeModel newSize model
MouseClick pos ->
handleMouseClick pos model
TouchEnd pos ->
handleMouseClick pos model <- ADDED
And EUREKA, it now works on the iPhone!
Now I’m 100% sure this is NOT the right way to do this - adding touchend to
Mouse.elm. If anyone who actually knows what they are doing wants to add a
proper Touch.elm module, or otherwise tell me how to do this correctly, I’m
all ears.
I’m also considering re-implementing my whole VIEW code path using the HTML
approach. This seems to be the preferred direction for Elm apps. But I’m
not sure how much sense that makes or even it is doable in a way that
provides the same slick app I have now. It’s all graphics so it really
just wants to put a CANVAS on the whole screen and draw in it.
thx Bill
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