forked from GitHub-Mirror/riotX-android
48 lines
1.7 KiB
Kotlin
48 lines
1.7 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.os.Bundle
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import android.os.Parcelable
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import androidx.recyclerview.widget.RecyclerView
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import im.vector.riotredesign.core.platform.DefaultListUpdateCallback
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import im.vector.riotredesign.core.platform.Restorable
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import java.util.concurrent.atomic.AtomicReference
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private const val LAYOUT_MANAGER_STATE = "LAYOUT_MANAGER_STATE"
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class LayoutManagerStateRestorer(private val layoutManager: RecyclerView.LayoutManager) : Restorable, DefaultListUpdateCallback {
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private var layoutManagerState = AtomicReference<Parcelable?>()
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override fun onSaveInstanceState(outState: Bundle) {
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val layoutManagerState = layoutManager.onSaveInstanceState()
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outState.putParcelable(LAYOUT_MANAGER_STATE, layoutManagerState)
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}
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override fun onRestoreInstanceState(savedInstanceState: Bundle?) {
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val parcelable = savedInstanceState?.getParcelable<Parcelable>(LAYOUT_MANAGER_STATE)
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layoutManagerState.set(parcelable)
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}
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override fun onInserted(position: Int, count: Int) {
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layoutManagerState.getAndSet(null)?.also {
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layoutManager.onRestoreInstanceState(it)
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}
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}
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} |