I think I understand this, but let me run it past you all to check.
I notices that some of my animations are happening in sequence instead of
in parallel. That is one animation must complete before the next begins.
I set up the animation subscriptions like this:
subscriptions : Model -> Sub Msg
subscriptions model =
List.map
(\zipper ->
Animation.subscription (Animate zipper)
[ Zipper.datum zipper |> .controlBarStyle ]
)
(collectAnimatedNodes model.contentTree)
|> Sub.batch
The idea being that each Animate message is associated with a zipper, to
tell it which part of a tree needs updated. The state for this particular
piece of the application is held in an elm-multiway-tree-zipper
(http://package.elm-lang.org/packages/tomjkidd/elm-multiway-tree-zipper/latest).
The way to associate a message with part of the tree is to pass a zipper,
which also means that my Animate messages are each associated with just one
thing that needs animated.
When an Animate message is passed to 'update' is just update one part of
the tree:
Animate zipper msg ->
case updateControlBarAnimation (Animation.update msg) zipper of
Nothing ->
( model, Nothing )
Just newTree ->
( { model | contentTree = newTree }, Nothing )
In another part of my application, when I get an Animate message, I update
_all_ animations, and this does display the animations running in parallel:
Animate msg ->
( { model
| menuStyle = Animation.update msg model.menuStyle
, slideButtonStyle = Animation.update msg
model.slideButtonStyle
}
, Cmd.none
)
So I think that Animate messages are sent out on a timer, one per tick,
rather than one per animation needing updated? I was assuming that
Animation.subscription would generate one Animate message per animation
needing updated, so if two updates occurred on the same tick there would be
2 messages. This seems not to be the case.
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