NOTE: Svg.Lazy
goes up to lazy8
, but Origami.Svg.Lazy
can only go
up to lazy7
because it uses one of the arguments to track styling info.
VirtualDom.lazyX
を使うために暗黙的にtoPlainNode
が使われています。 つまりlazyX
が使われたところでstyle tagが生成されます。
Since all Elm functions are pure we have a guarantee that the same input
will always result in the same output. This module gives us tools to be lazy
about building Svg
that utilize this fact.
Rather than immediately applying functions to their arguments, the lazy
functions just bundle the function and arguments up for later. When diffing
the old and new virtual DOM, it checks to see if all the arguments are equal.
If so, it skips calling the function!
This is a really cheap test and often makes things a lot faster, but definitely benchmark to be sure!
lazy : (a -> Origami.Svg.Svg msg) -> a -> Origami.Svg.Svg msg
A performance optimization that delays the building of virtual DOM nodes.
Calling (view model)
will definitely build some virtual DOM, perhaps a lot of
it. Calling (lazy view model)
delays the call until later. During diffing, we
can check to see if model
is referentially equal to the previous value used,
and if so, we just stop. No need to build up the tree structure and diff it,
we know if the input to view
is the same, the output must be the same!
lazy2 : (a -> b -> Origami.Svg.Svg msg) -> a -> b -> Origami.Svg.Svg msg
Same as lazy
but checks on two arguments.
lazy3 : (a -> b -> c -> Origami.Svg.Svg msg) -> a -> b -> c -> Origami.Svg.Svg msg
Same as lazy
but checks on three arguments.
lazy4 : (a -> b -> c -> d -> Origami.Svg.Svg msg) -> a -> b -> c -> d -> Origami.Svg.Svg msg
Same as lazy
but checks on four arguments.
lazy5 : (a -> b -> c -> d -> e -> Origami.Svg.Svg msg) -> a -> b -> c -> d -> e -> Origami.Svg.Svg msg
Same as lazy
but checks on five arguments.
lazy6 : (a -> b -> c -> d -> e -> f -> Origami.Svg.Svg msg) -> a -> b -> c -> d -> e -> f -> Origami.Svg.Svg msg
Same as lazy
but checks on six arguments.
lazy7 : (a -> b -> c -> d -> e -> f -> g -> Origami.Svg.Svg msg) -> a -> b -> c -> d -> e -> f -> g -> Origami.Svg.Svg msg
Same as lazy
but checks on seven arguments.