Last active
May 3, 2020 11:14
-
-
Save kirich1409/d74c1dfadde1c6261f128c9515c0ffaf to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class FragmentViewBindingProperty<T : ViewBinding>( | |
private val viewBinder: ViewBinder<T> | |
) : ReadOnlyProperty<Fragment, T> { | |
private var viewBinding: T? = null | |
private val lifecycleObserver = BindingLifecycleObserver() | |
@MainThread | |
override fun getValue(thisRef: Fragment, property: KProperty<*>): T { | |
checkIsMainThread() | |
this.viewBinding?.let { return it } | |
val view = thisRef.requireView() | |
thisRef.viewLifecycleOwner.lifecycle.addObserver(lifecycleObserver) | |
return viewBinder.bind(view).also { vb -> this.viewBinding = vb } | |
} | |
private inner class BindingLifecycleObserver : DefaultLifecycleObserver { | |
private val mainHandler = Handler(Looper.getMainLooper()) | |
@MainThread | |
override fun onDestroy(owner: LifecycleOwner) { | |
owner.lifecycle.removeObserver(this) | |
// Fragment.viewLifecycleOwner call LifecycleObserver.onDestroy() before Fragment.onDestroyView(). | |
// That's why we need to postpone reset of the viewBinding | |
mainHandler.post { | |
viewBinding = null | |
} | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment