140 lines
5.1 KiB
Kotlin
140 lines
5.1 KiB
Kotlin
/* Copyright 2021 Tusky Contributors
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.components.timeline
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import android.view.LayoutInflater
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import android.view.ViewGroup
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import androidx.paging.PagingDataAdapter
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import androidx.recyclerview.widget.DiffUtil
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import androidx.recyclerview.widget.RecyclerView
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import com.keylesspalace.tusky.R
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import com.keylesspalace.tusky.adapter.PlaceholderViewHolder
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import com.keylesspalace.tusky.adapter.StatusBaseViewHolder
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import com.keylesspalace.tusky.adapter.StatusViewHolder
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import com.keylesspalace.tusky.interfaces.StatusActionListener
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import com.keylesspalace.tusky.util.StatusDisplayOptions
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import com.keylesspalace.tusky.viewdata.StatusViewData
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class TimelinePagingAdapter(
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private var statusDisplayOptions: StatusDisplayOptions,
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private val statusListener: StatusActionListener
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) : PagingDataAdapter<StatusViewData, RecyclerView.ViewHolder>(TimelineDifferCallback) {
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var mediaPreviewEnabled: Boolean
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get() = statusDisplayOptions.mediaPreviewEnabled
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set(mediaPreviewEnabled) {
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statusDisplayOptions = statusDisplayOptions.copy(
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mediaPreviewEnabled = mediaPreviewEnabled
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)
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}
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init {
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stateRestorationPolicy = StateRestorationPolicy.PREVENT_WHEN_EMPTY
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}
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override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
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return when (viewType) {
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VIEW_TYPE_STATUS -> {
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val view = LayoutInflater.from(viewGroup.context)
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.inflate(R.layout.item_status, viewGroup, false)
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StatusViewHolder(view)
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}
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VIEW_TYPE_PLACEHOLDER -> {
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val view = LayoutInflater.from(viewGroup.context)
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.inflate(R.layout.item_status_placeholder, viewGroup, false)
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PlaceholderViewHolder(view)
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}
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else -> {
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val view = LayoutInflater.from(viewGroup.context)
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.inflate(R.layout.item_status, viewGroup, false)
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StatusViewHolder(view)
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}
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}
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}
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override fun onBindViewHolder(viewHolder: RecyclerView.ViewHolder, position: Int) {
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bindViewHolder(viewHolder, position, null)
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}
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override fun onBindViewHolder(
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viewHolder: RecyclerView.ViewHolder,
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position: Int,
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payloads: List<*>
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) {
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bindViewHolder(viewHolder, position, payloads)
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}
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private fun bindViewHolder(
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viewHolder: RecyclerView.ViewHolder,
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position: Int,
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payloads: List<*>?
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) {
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val status = getItem(position)
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if (status is StatusViewData.Placeholder) {
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val holder = viewHolder as PlaceholderViewHolder
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holder.setup(statusListener, status.isLoading)
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} else if (status is StatusViewData.Concrete) {
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val holder = viewHolder as StatusViewHolder
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holder.setupWithStatus(
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status,
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statusListener,
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statusDisplayOptions,
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if (payloads != null && payloads.isNotEmpty()) payloads[0] else null
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)
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}
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}
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override fun getItemViewType(position: Int): Int {
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return if (getItem(position) is StatusViewData.Placeholder) {
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VIEW_TYPE_PLACEHOLDER
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} else {
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VIEW_TYPE_STATUS
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}
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}
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companion object {
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private const val VIEW_TYPE_STATUS = 0
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private const val VIEW_TYPE_PLACEHOLDER = 2
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val TimelineDifferCallback = object : DiffUtil.ItemCallback<StatusViewData>() {
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override fun areItemsTheSame(
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oldItem: StatusViewData,
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newItem: StatusViewData
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): Boolean {
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return oldItem.id == newItem.id
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}
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override fun areContentsTheSame(
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oldItem: StatusViewData,
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newItem: StatusViewData
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): Boolean {
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return false // Items are different always. It allows to refresh timestamp on every view holder update
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}
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override fun getChangePayload(
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oldItem: StatusViewData,
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newItem: StatusViewData
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): Any? {
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return if (oldItem == newItem) {
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// If items are equal - update timestamp only
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listOf(StatusBaseViewHolder.Key.KEY_CREATED)
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} else // If items are different - update the whole view holder
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null
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}
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}
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}
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}
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