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Add useRefValue hook #472

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merged 1 commit into from
Jun 5, 2021
Merged

Add useRefValue hook #472

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36 changes: 36 additions & 0 deletions kotlin-react/src/main/kotlin/react/useRefValue.kt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
@file:Suppress(
"NOTHING_TO_INLINE",
)

package react

import kotlin.reflect.KProperty

inline fun <T : Any> useRefValue(): RefDelegate<T?> =
useRef<T>()
.unsafeCast<RefDelegate<T?>>()

inline fun <T : Any> useRefValue(
initialValue: T,
): RefDelegate<T> =
useRef(initialValue)
.unsafeCast<RefDelegate<T>>()

// TODO: make external in IR
class RefDelegate<T>
private constructor() {
inline operator fun getValue(
thisRef: Nothing?,
property: KProperty<*>,
): T {
return asDynamic().current
}

inline operator fun setValue(
thisRef: Nothing?,
property: KProperty<*>,
value: T,
) {
asDynamic().current = value
}
}