forked from GitHub-Mirror/riotX-android
61 lines
1.9 KiB
Kotlin
61 lines
1.9 KiB
Kotlin
/*
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* Copyright 2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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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 RiotEpoxyHolder : 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<RiotEpoxyHolder, V> =
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Lazy { holder: RiotEpoxyHolder, 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: (RiotEpoxyHolder, KProperty<*>) -> V
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) : ReadOnlyProperty<RiotEpoxyHolder, 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: RiotEpoxyHolder, 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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} |