1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.fenix.home.topsites
import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.annotation.VisibleForTesting
import androidx.lifecycle.LifecycleOwner
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import mozilla.components.feature.top.sites.TopSite
import org.mozilla.fenix.components.AppStore
import org.mozilla.fenix.home.sessioncontrol.AdapterItem.TopSitePagerPayload
import org.mozilla.fenix.home.sessioncontrol.TopSiteInteractor
import org.mozilla.fenix.home.topsites.TopSitePagerViewHolder.Companion.TOP_SITES_PER_PAGE
class TopSitesPagerAdapter(
private val appStore: AppStore,
private val viewLifecycleOwner: LifecycleOwner,
private val interactor: TopSiteInteractor,
) : ListAdapter<List<TopSite>, TopSiteViewHolder>(TopSiteListDiffCallback) {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TopSiteViewHolder {
val view = LayoutInflater.from(parent.context)
.inflate(TopSiteViewHolder.LAYOUT_ID, parent, false)
return TopSiteViewHolder(view, appStore, viewLifecycleOwner, interactor)
}
override fun onBindViewHolder(
holder: TopSiteViewHolder,
position: Int,
payloads: MutableList<Any>,
) {
if (payloads.isNullOrEmpty()) {
onBindViewHolder(holder, position)
} else {
if (payloads[0] is TopSitePagerPayload) {
val adapter = holder.binding.topSitesList.adapter as TopSitesAdapter
val payload = payloads[0] as TopSitePagerPayload
update(payload, position, adapter)
}
}
}
@VisibleForTesting
internal fun update(
payload: TopSitePagerPayload,
position: Int,
adapter: TopSitesAdapter,
) {
// Only currently selected page items need to be updated
val currentPageChangedItems = getCurrentPageChanges(payload, position)
// If no changes have been made to the current page no need to continue
if (currentPageChangedItems.isEmpty()) return
// Build the new list from the old one
val refreshedItems: MutableList<TopSite> = mutableListOf()
refreshedItems.addAll(adapter.currentList)
// Update new list with the changed items
currentPageChangedItems.forEach { item ->
val index = item.first - (position * TOP_SITES_PER_PAGE)
if (index in refreshedItems.indices) {
refreshedItems[index] = item.second
}
}
// Display the updated list without any of the removed items
adapter.submitList(refreshedItems.filter { it.id != -1L })
}
/**
* @returns the changed only items for the currently specified page in [position]
*/
@VisibleForTesting
internal fun getCurrentPageChanges(payload: TopSitePagerPayload, position: Int) =
payload.changed.filter { changedPair ->
if (position == 0) {
changedPair.first < TOP_SITES_PER_PAGE
} else {
changedPair.first >= TOP_SITES_PER_PAGE
}
}
override fun onBindViewHolder(holder: TopSiteViewHolder, position: Int) {
val adapter = holder.binding.topSitesList.adapter as TopSitesAdapter
adapter.submitList(getItem(position))
}
internal object TopSiteListDiffCallback : DiffUtil.ItemCallback<List<TopSite>>() {
override fun areItemsTheSame(oldItem: List<TopSite>, newItem: List<TopSite>): Boolean {
return oldItem.size == newItem.size
}
override fun areContentsTheSame(oldItem: List<TopSite>, newItem: List<TopSite>): Boolean {
@Suppress("DiffUtilEquals")
return newItem.zip(oldItem).all { (new, old) -> new == old }
}
override fun getChangePayload(oldItem: List<TopSite>, newItem: List<TopSite>): Any? {
val changed = mutableSetOf<Pair<Int, TopSite>>()
for ((index, item) in newItem.withIndex()) {
if (oldItem.getOrNull(index) != item) {
changed.add(Pair(index, item))
}
}
return if (changed.isNotEmpty()) TopSitePagerPayload(changed) else null
}
}
}
|
