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Add onWillBeDestroyed callback to ViewBinderDelegate

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This commit is contained in:
Alex Hart
2022-09-28 14:45:27 -03:00
parent 0cae15b7fd
commit 9498a34293
2 changed files with 19 additions and 5 deletions
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15
app/src/main/java/org/thoughtcrime/securesms/components/ViewBinderDelegate.kt
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@@ -11,11 +11,19 @@ import kotlin.reflect.KProperty
* ViewBinderDelegate which enforces the "best practices" for maintaining a reference to a view binding given by
* Android official documentation.
*/
class ViewBinderDelegate<T : ViewBinding>(private val bindingFactory: (View) -> T) : DefaultLifecycleObserver {
open class ViewBinderDelegate<T : ViewBinding>(
private val bindingFactory: (View) -> T,
private val onBindingWillBeDestroyed: (T) -> Unit = {}
) : DefaultLifecycleObserver {
private var binding: T? = null
private var isBindingDestroyed = false
operator fun getValue(thisRef: Fragment, property: KProperty<*>): T {
if (isBindingDestroyed) {
error("Binding has been destroyed.")
}
if (binding == null) {
thisRef.viewLifecycleOwner.lifecycle.addObserver(this@ViewBinderDelegate)
binding = bindingFactory(thisRef.requireView())
@@ -25,6 +33,11 @@ class ViewBinderDelegate<T : ViewBinding>(private val bindingFactory: (View) ->
}
override fun onDestroy(owner: LifecycleOwner) {
if (binding != null) {
onBindingWillBeDestroyed(binding!!)
}
binding = null
isBindingDestroyed = true
}
}