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migrating to ViewBinding part 4: Fragments (#2108)

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* migrating to ViewBinding part 4: Fragment

* fix imports

* don't use viewBinding extension in ViewImage and ViewVideoFragment

* don't use viewBinding extension in ViewImage and ViewVideoFragment
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Konrad Pozniak 2021-03-13 21:27:20 +01:00 • committed by GitHub
commit bea5098cc1
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18 changed files with 412 additions and 349 deletions
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56
app/src/main/java/com/keylesspalace/tusky/util/ViewBindingExtensions.kt
View file

@ -1,15 +1,67 @@
package com.keylesspalace.tusky.util
import android.view.LayoutInflater
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.Fragment
import androidx.lifecycle.DefaultLifecycleObserver
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.viewbinding.ViewBinding
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty
/**
* https://medium.com/@Zhuinden/simple-one-liner-viewbinding-in-fragments-and-activities-with-kotlin-961430c6c07c
*/
inline fun <T : ViewBinding> AppCompatActivity.viewBinding(
crossinline bindingInflater: (LayoutInflater) -> T
crossinline bindingInflater: (LayoutInflater) -> T
) = lazy(LazyThreadSafetyMode.NONE) {
bindingInflater(layoutInflater)
}
}
class FragmentViewBindingDelegate<T : ViewBinding>(
val fragment: Fragment,
val viewBindingFactory: (View) -> T
) : ReadOnlyProperty<Fragment, T> {
private var binding: T? = null
init {
fragment.lifecycle.addObserver(
object : DefaultLifecycleObserver {
override fun onCreate(owner: LifecycleOwner) {
fragment.viewLifecycleOwnerLiveData.observe(
fragment,
{ t ->
t?.lifecycle?.addObserver(
object : DefaultLifecycleObserver {
override fun onDestroy(owner: LifecycleOwner) {
binding = null
}
}
)
}
)
}
}
)
}
override fun getValue(thisRef: Fragment, property: KProperty<*>): T {
val binding = binding
if (binding != null) {
return binding
}
val lifecycle = fragment.viewLifecycleOwner.lifecycle
if (!lifecycle.currentState.isAtLeast(Lifecycle.State.INITIALIZED)) {
throw IllegalStateException("Should not attempt to get bindings when Fragment views are destroyed.")
}
return viewBindingFactory(thisRef.requireView()).also { this@FragmentViewBindingDelegate.binding = it }
}
}
fun <T : ViewBinding> Fragment.viewBinding(viewBindingFactory: (View) -> T) =
FragmentViewBindingDelegate(this, viewBindingFactory)