Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Add state delegate for useState hook #156

Merged
merged 3 commits into from
Apr 4, 2020
Merged

Add state delegate for useState hook #156

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
40285bc
Add state delegate for useState hook
ilgonmic Apr 4, 2020
1d83d4c
Fix formatting
ilgonmic Apr 4, 2020
ba3ec5c
Lazy state delegate
ilgonmic Apr 4, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 22 additions & 0 deletions kotlin-react/src/main/kotlin/react/hooks.kt
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,8 @@
package react

import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty

typealias RDependenciesArray = Array<dynamic>
typealias RDependenciesList = List<dynamic>

Expand All @@ -19,6 +22,25 @@ fun <T> useState(valueInitializer: () -> T): Pair<T, RSetState<T>> {
return currentValue to setState
}

private class ReactStateDelegate<T>(useState: Pair<T, RSetState<T>>) : ReadWriteProperty<Any?, T> {
private val state = useState.first

private val setState = useState.second

override operator fun getValue(thisRef: Any?, property: KProperty<*>): T =
state

override operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
setState(value)
}
}

fun <T> state(initValue: T): ReadWriteProperty<Any?, T> =
ReactStateDelegate(useState(initValue))

fun <T> state(valueInitializer: () -> T): ReadWriteProperty<Any?, T> =
ReactStateDelegate(useState(valueInitializer))

typealias RReducer<S, A> = (state: S, action: A) -> S
typealias RDispatch<A> = (action: A) -> Unit

Expand Down