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152 lines
6.1 KiB
Kotlin
152 lines
6.1 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.library.history
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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 org.mozilla.fenix.library.history.viewholders.HistoryListItemViewHolder
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import org.mozilla.fenix.selection.SelectionHolder
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/**
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* Adapter for the list of visited pages, that uses Paging 3 versions of the Paging library.
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*/
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class HistoryAdapter(
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private val historyInteractor: HistoryInteractor,
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private val onEmptyStateChanged: (Boolean) -> Unit,
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) : PagingDataAdapter<History, HistoryListItemViewHolder>(historyDiffCallback),
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SelectionHolder<History> {
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private var mode: HistoryFragmentState.Mode = HistoryFragmentState.Mode.Normal
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private var pendingDeletionItems = emptySet<PendingDeletionHistory>()
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private val itemsWithHeaders: MutableMap<HistoryItemTimeGroup, Int> = mutableMapOf()
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// A flag to track the empty state of the list. Items are not being deleted immediately,
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// but hidden from the UI until the Undo snackbar will execute the delayed operation.
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// Whether the adapter has actually zero items or all present items are hidden,
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// the screen should be updated into proper empty/not empty state.
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private var isEmpty = true
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override val selectedItems
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get() = mode.selectedItems
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override fun getItemViewType(position: Int): Int = HistoryListItemViewHolder.LAYOUT_ID
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override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HistoryListItemViewHolder {
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val view = LayoutInflater.from(parent.context).inflate(viewType, parent, false)
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return HistoryListItemViewHolder(view, historyInteractor, this)
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}
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fun updateMode(mode: HistoryFragmentState.Mode) {
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this.mode = mode
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// Update the delete button alpha that the first item holds
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if (itemCount > 0) notifyItemChanged(0)
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}
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@Suppress("ComplexMethod")
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override fun onBindViewHolder(holder: HistoryListItemViewHolder, position: Int) {
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val current = getItem(position) ?: return
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var isPendingDeletion = false
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var groupPendingDeletionCount = 0
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var timeGroup: HistoryItemTimeGroup? = null
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if (position == 0) {
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isEmpty = true
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}
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if (pendingDeletionItems.isNotEmpty()) {
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when (current) {
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is History.Regular -> {
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isPendingDeletion = pendingDeletionItems.find {
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it is PendingDeletionHistory.Item && it.visitedAt == current.visitedAt
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} != null
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}
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is History.Group -> {
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isPendingDeletion = pendingDeletionItems.find {
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it is PendingDeletionHistory.Group && it.visitedAt == current.visitedAt
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} != null
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if (!isPendingDeletion) {
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groupPendingDeletionCount = current.items.count { historyMetadata ->
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pendingDeletionItems.find {
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it is PendingDeletionHistory.MetaData &&
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it.key == historyMetadata.historyMetadataKey &&
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it.visitedAt == historyMetadata.visitedAt
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} != null
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}.also {
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if (it == current.items.size) {
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isPendingDeletion = true
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}
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}
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}
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}
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else -> {}
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}
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}
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// Add or remove the header and position to the map depending on it's deletion status
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if (itemsWithHeaders.containsKey(current.historyTimeGroup)) {
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if (isPendingDeletion && itemsWithHeaders[current.historyTimeGroup] == position) {
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itemsWithHeaders.remove(current.historyTimeGroup)
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} else if (isPendingDeletion && itemsWithHeaders[current.historyTimeGroup] != position) {
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// do nothing
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} else {
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if (position <= itemsWithHeaders[current.historyTimeGroup] as Int) {
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itemsWithHeaders[current.historyTimeGroup] = position
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timeGroup = current.historyTimeGroup
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}
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}
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} else if (!isPendingDeletion) {
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itemsWithHeaders[current.historyTimeGroup] = position
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timeGroup = current.historyTimeGroup
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}
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// If there is a single visible item, it's enough to change the empty state of the view.
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if (isEmpty && !isPendingDeletion) {
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isEmpty = false
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onEmptyStateChanged.invoke(isEmpty)
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} else if (position + 1 == itemCount) {
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// If we reached the bottom of the list and there still has been zero visible items,
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// we can can change the History view state to empty.
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if (isEmpty) {
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onEmptyStateChanged.invoke(isEmpty)
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}
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}
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holder.bind(
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current,
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timeGroup,
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position == 0,
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mode,
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isPendingDeletion,
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groupPendingDeletionCount,
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)
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}
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/**
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* @param pendingDeletionItems is used to filter out the items that should not be displayed.
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*/
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fun updatePendingDeletionItems(pendingDeletionItems: Set<PendingDeletionHistory>) {
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this.pendingDeletionItems = pendingDeletionItems
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}
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companion object {
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private val historyDiffCallback = object : DiffUtil.ItemCallback<History>() {
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override fun areItemsTheSame(oldItem: History, newItem: History): Boolean {
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return oldItem == newItem
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}
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override fun areContentsTheSame(oldItem: History, newItem: History): Boolean {
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return oldItem == newItem
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}
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override fun getChangePayload(oldItem: History, newItem: History): Any? {
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return newItem
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}
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}
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}
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}
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