forked from GitHub-Mirror/riotX-android
45 lines
1.3 KiB
Kotlin
45 lines
1.3 KiB
Kotlin
package im.vector.riotredesign.core.epoxy
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import android.view.View
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import com.airbnb.epoxy.EpoxyHolder
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import kotlin.properties.ReadOnlyProperty
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import kotlin.reflect.KProperty
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/**
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* A pattern for easier view binding with an [EpoxyHolder]
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*
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* See [SampleKotlinModelWithHolder] for a usage example.
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*/
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abstract class KotlinEpoxyHolder : EpoxyHolder() {
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private lateinit var view: View
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override fun bindView(itemView: View) {
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view = itemView
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}
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protected fun <V : View> bind(id: Int): ReadOnlyProperty<KotlinEpoxyHolder, V> =
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Lazy { holder: KotlinEpoxyHolder, prop ->
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holder.view.findViewById(id) as V?
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?: throw IllegalStateException("View ID $id for '${prop.name}' not found.")
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}
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/**
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* Taken from Kotterknife.
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* https://github.com/JakeWharton/kotterknife
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*/
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private class Lazy<V>(
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private val initializer: (KotlinEpoxyHolder, KProperty<*>) -> V
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) : ReadOnlyProperty<KotlinEpoxyHolder, V> {
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private object EMPTY
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private var value: Any? = EMPTY
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override fun getValue(thisRef: KotlinEpoxyHolder, property: KProperty<*>): V {
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if (value == EMPTY) {
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value = initializer(thisRef, property)
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}
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@Suppress("UNCHECKED_CAST")
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return value as V
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}
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}
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} |