Extensions to Android Arch Components
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package uz.gap.messenger.ext | |
import android.arch.lifecycle.* | |
import android.support.v4.app.Fragment | |
import android.support.v4.app.FragmentActivity | |
import uz.gap.messenger.connection.SocketModel.MessageStatus | |
/** | |
* created at 3/31/18 | |
* | |
* @author Ozodrukh | |
* @version 1.0 | |
*/ | |
inline fun <reified T : ViewModel> FragmentActivity.viewModelOf(tag: String? = null): T { | |
return if (tag == null) { | |
ViewModelProviders.of(this).get(T::class.java) | |
} else { | |
ViewModelProviders.of(this).get(tag, T::class.java) | |
} | |
} | |
inline fun <reified T : ViewModel> Fragment.viewModelOf(tag: String? = null): T { | |
return if (tag == null) { | |
ViewModelProviders.of(this).get(T::class.java) | |
} else { | |
ViewModelProviders.of(this).get(tag, T::class.java) | |
} | |
} | |
inline fun <reified T : ViewModel> Fragment.activityViewModelOf(tag: String? = null): T { | |
return if (tag == null) { | |
ViewModelProviders.of(activity!!).get(T::class.java) | |
} else { | |
ViewModelProviders.of(activity!!).get(tag, T::class.java) | |
} | |
} | |
/** | |
* Simple observer that used with kotlin to avoid null checks iach time | |
*/ | |
inline fun <T> LiveData<T>.safeObserve(owner: LifecycleOwner, crossinline block: (T) -> Unit) { | |
observe(owner, Observer { response -> response?.let(block) }) | |
} | |
fun <K, T> LiveData<K>.then(transformer: (K) -> LiveData<T>?): LiveData<T> { | |
return Transformations.switchMap<K, T>(this, transformer) | |
} | |
inline fun <T, K> LiveData<MessageStatus<T>>.thenWhenResponded(crossinline transformer: (MessageStatus<T>) | |
-> LiveData<MessageStatus<K>>?): LiveData<MessageStatus<K>> { | |
return then { | |
return@then if (it.delivered() && it.responded()) transformer(it) else null | |
} | |
} |
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