): TabbedListMediator {
90 | mIndices = newIndices
91 |
92 | if (mIsAttached) {
93 | reAttach()
94 | }
95 |
96 | return this
97 | }
98 |
99 | /**
100 | * This method will ensure that any listeners that have been added by the mediator will be
101 | * removed, including the one listener from
102 | * @see TabbedListMediator#addOnViewOfTabClickListener((TabLayout.Tab, int) -> Unit)
103 | */
104 |
105 | private fun clearListeners() {
106 | mRecyclerView.clearOnScrollListeners()
107 | for (i in 0 until mTabLayout.tabCount) {
108 | mTabLayout.getTabAt(i)!!.view.setOnClickListener(null)
109 | }
110 | for (i in tabViewCompositeClickListener.getListeners().indices) {
111 | tabViewCompositeClickListener.getListeners().toMutableList().removeAt(i)
112 | }
113 | mTabLayout.removeOnTabSelectedListener(onTabSelectedListener)
114 | mRecyclerView.removeOnScrollListener(onScrollListener)
115 | }
116 |
117 | /**
118 | * This method will attach the listeners required to make the synchronization possible.
119 | */
120 |
121 | private fun notifyIndicesChanged() {
122 | tabViewCompositeClickListener.addListener { _, _ -> mTabClickFlag = true }
123 | tabViewCompositeClickListener.build()
124 | mTabLayout.addOnTabSelectedListener(onTabSelectedListener)
125 | mRecyclerView.addOnScrollListener(onScrollListener)
126 | }
127 |
128 | private val onTabSelectedListener = object : OnTabSelectedListener {
129 | override fun onTabSelected(tab: TabLayout.Tab) {
130 |
131 | if (!mTabClickFlag) return
132 |
133 | val position = tab.position
134 |
135 | if (mIsSmoothScroll) {
136 | smoothScroller.targetPosition = mIndices[position]
137 | mRecyclerView.layoutManager?.startSmoothScroll(smoothScroller)
138 | } else {
139 | (mRecyclerView.layoutManager as LinearLayoutManager?)?.scrollToPositionWithOffset(
140 | mIndices[position],
141 | 0
142 | )
143 | mTabClickFlag = false
144 | }
145 | }
146 |
147 | override fun onTabUnselected(tab: TabLayout.Tab) {}
148 | override fun onTabReselected(tab: TabLayout.Tab) {}
149 | }
150 |
151 | private val onScrollListener = object : RecyclerView.OnScrollListener() {
152 | override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
153 | mRecyclerState = newState
154 | if (mIsSmoothScroll && newState == RecyclerView.SCROLL_STATE_IDLE) {
155 | mTabClickFlag = false
156 | }
157 | }
158 |
159 | override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
160 | super.onScrolled(recyclerView, dx, dy)
161 | if (mTabClickFlag) {
162 | return
163 | }
164 |
165 | val linearLayoutManager: LinearLayoutManager =
166 | recyclerView.layoutManager as LinearLayoutManager?
167 | ?: throw RuntimeException("No LinearLayoutManager attached to the RecyclerView.")
168 |
169 | var itemPosition =
170 | linearLayoutManager.findFirstCompletelyVisibleItemPosition()
171 |
172 | if (itemPosition == -1) {
173 | itemPosition =
174 | linearLayoutManager.findFirstVisibleItemPosition()
175 | }
176 |
177 | if (mRecyclerState == RecyclerView.SCROLL_STATE_DRAGGING
178 | || mRecyclerState == RecyclerView.SCROLL_STATE_SETTLING
179 | ) {
180 | for (i in mIndices.indices) {
181 | if (itemPosition == mIndices[i]) {
182 | if (!mTabLayout.getTabAt(i)!!.isSelected) {
183 | mTabLayout.getTabAt(i)!!.select()
184 | }
185 | if (linearLayoutManager.findLastCompletelyVisibleItemPosition() == mIndices[mIndices.size - 1]) {
186 | if (!mTabLayout.getTabAt(mIndices.size - 1)!!.isSelected) {
187 | mTabLayout.getTabAt(mIndices.size - 1)!!.select()
188 | }
189 | return
190 | }
191 | }
192 | }
193 | }
194 | }
195 | }
196 |
197 | /**
198 | * @return the state of the mediator, either attached or not.
199 | */
200 |
201 | fun isAttached(): Boolean {
202 | return mIsAttached
203 | }
204 |
205 | /**
206 | * @return the state of the mediator, is smooth scrolling or not.
207 | */
208 |
209 | fun isSmoothScroll(): Boolean {
210 | return mIsSmoothScroll
211 | }
212 |
213 | /**
214 | * @param smooth sets up the mediator with smooth scrolling
215 | */
216 |
217 | fun setSmoothScroll(smooth: Boolean) {
218 | mIsSmoothScroll = smooth
219 | }
220 |
221 | /**
222 | * @param listener the listener the will applied on "the view" of the tab. This method is useful
223 | * when attaching a click listener on the tabs of the TabLayout.
224 | * Note that this method is REQUIRED in case of the need of adding a click listener on the view
225 | * of a tab layout. Since the mediator uses a click flag @see TabbedListMediator#mTabClickFlag
226 | * it's taking the place of the normal on click listener, and thus the need of the composite click
227 | * listener pattern, so adding listeners should be done using this method.
228 | */
229 |
230 | fun addOnViewOfTabClickListener(
231 | listener: (tab: TabLayout.Tab, position: Int) -> Unit
232 | ) {
233 | tabViewCompositeClickListener.addListener(listener)
234 | if (mIsAttached) {
235 | notifyIndicesChanged()
236 | }
237 | }
238 | }
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | TabSync
2 |
3 |
4 | 
5 | 
6 | 
7 |
8 |
9 |
10 |
11 |
12 | 
13 |
14 |
15 |
16 | A lightweight synchronizer between Android's Tabs and Lists! Available for
17 | Views
18 | and Jetpack Compose!
19 |
20 |
21 | ## Behaviour expected ##
22 |
23 | As you scroll through items, the corresponding tabs will be selected automatically, and vice-versa; selecting tabs by hand will correspond to a scroll of the list to the corresponding item.
24 |
25 |
26 | 
27 | 
28 |
29 |
30 | ## Available on the View System & Jetpack Compose ##
31 |
32 | - On Android's [View](https://github.com/Ahmad-Hamwi/TabSync#setup-for-the-view-system), synchronization is made between TabLayout and RecyclerView
33 | - Android's [Jetpack Compose](https://github.com/Ahmad-Hamwi/TabSync#setup-for-jetpack-compose), the synchronization is made between any LazeListState-based Composable (e.g. LazyColumn) and an index-based Composable (e.g. ScrollableTabRow).
34 |
35 | ## Articles ##
36 | - RecyclerView and TabLayout: Here's a [Medium Article](https://ahmad-hamwi.medium.com/synchronize-recyclerview-with-tablayout-3c5da4f3b18b) demonstrating the example in this repo step-by-step.
37 | - Jetpack compose: Here's the Jetpack Compose version [Medium Article](https://proandroiddev.com/jetpack-compose-synchronize-lazyliststate-with-scrollabletabrow-22ff1f8577dc) demonstrating the example in this repo step-by-step, and explaining how it's working.
38 |
39 | # Setup for the View system #
40 |
41 | Get the latest version via Maven Central:
42 |
43 | [](https://maven-badges.herokuapp.com/maven-central/io.github.ahmad-hamwi/tabsync)
44 |
45 | Add Maven Central repository to your root build.gradle at the end of repositories:
46 |
47 | ```groovy
48 | allprojects {
49 | repositories {
50 | ...
51 | mavenCentral()
52 | }
53 | }
54 | ```
55 |
56 | Then add the dependency
57 |
58 | ```groovy
59 | dependencies {
60 | implementation 'io.github.ahmad-hamwi:tabsync:1.0.1'
61 | }
62 | ```
63 |
64 | ## Usage ##
65 |
66 | Here is a non-comprehensive guide to TabSync:
67 |
68 | Create a TabbedListMediator, and pass a RecyclerView, a TabLayout, and a list of RecyclerView's items indices that you wish to sync the tabs with.
69 |
70 | ```kotlin
71 | val mediator = TabbedListMediator(
72 | recyclerView,
73 | tabLayout,
74 | categories.indices.toList()
75 | )
76 | ```
77 |
78 | Make sure that RecyclerView and the TabLayout are instantiated with their data (adapter with its
79 | data for RecyclerView, and tabs for the TabLayout) and call the attach method. Note that the tabs'
80 | count must not be less than the number of the passed indices.
81 |
82 | ```kotlin
83 | method.attach()
84 | ```
85 |
86 | To make the RecycerView smooth scrolls when pressing on a tab, you can pass a smooth scroll
87 | flag to the mediator:
88 |
89 | ```kotlin
90 | val mediator = TabbedListMediator(
91 | recyclerView,
92 | tabLayout,
93 | categories.indices.toList(),
94 | true
95 | )
96 | ```
97 |
98 | To stop syncing between the RecyclerView and the TabLayout, call the detach method:
99 |
100 | ```kotlin
101 | mediator.detach()
102 | ```
103 |
104 | In case of refreshing the mediator (like data set has been changed), call the reAttach method:
105 |
106 | ```kotlin
107 | mediator.reAttach()
108 | ```
109 |
110 | To get the smooth scroll flag, call the getter isSmoothScroll()
111 |
112 | ```kotlin
113 | val isSmoothScrolling = mediator.isSmoothScroll()
114 | ```
115 |
116 | > **_NOTE:_** You don't have to pass the full indices of the list provided as shown in the previous example. You may want to provide a couple of indices from your recyclerview's items to sync the tabs with:
117 | > ```kotlin
118 | > val mediator = TabbedListMediator(
119 | > recyclerView,
120 | > tabLayout,
121 | > // Syncing the first tab with the item of index 0, the second one with the item of
122 | > // index 2, and the third with the item of index 4
123 | > mutableListOf(0, 2, 4)
124 | > )
125 | > ```
126 |
127 | # Setup for Jetpack Compose #
128 |
129 | Get the latest version via Maven Central:
130 |
131 | [](https://maven-badges.herokuapp.com/maven-central/io.github.ahmad-hamwi/tabsync-compose)
132 |
133 | Add Maven Central repository to your root build.gradle at the end of repositories:
134 |
135 | ```groovy
136 | allprojects {
137 | repositories {
138 | ...
139 | mavenCentral()
140 | }
141 | }
142 | ```
143 |
144 | Then add the dependency
145 |
146 | ```groovy
147 | dependencies {
148 | implementation 'io.github.ahmad-hamwi:tabsync-compose:1.0.1'
149 | }
150 | ```
151 |
152 | ## Usage ##
153 |
154 | Here is a non-comprehensive guide to TabSync Compose:
155 |
156 | Call ```lazyListTabSync``` composable, and pass the indices of your list that you wish to sync the tabs with, and assign the result to a destructuring declaration like so:
157 |
158 | ```kotlin
159 | @Composable
160 | fun MyComposable(items: List- ) {
161 |
162 | val (selectedTabIndex, setSelectedTabIndex, syncedListState) = lazyListTabSync(items.indices.toList())
163 |
164 | }
165 | ```
166 |
167 | Make sure that whenever you call ```lazyListTabSync```, the indices and the list's data are ready (above we're passing the state as a parameter).
168 |
169 | Note that the tabs' count must not be less than the number of the passed indices.
170 |
171 |
172 | - The ```selectedTabIndex``` is the state of a ```ScrollableTabRow``` that we're going to sync with.
173 | - The ```setSelectedTabIndex``` is a function that we should call whenever the state of the ```ScrollableTabRow``` changes directly, for example by pressing the tab.
174 |
175 |
176 | ``` kotlin
177 | ScrollableTabRow(selectedTabIndex) {
178 | categories.forEachIndexed { index, category ->
179 | Tab(
180 | selected = index == selectedTabIndex,
181 | onClick = { setSelectedTabIndex(index) },
182 | )
183 | }
184 | }
185 | ```
186 |
187 | - The ```listState``` is a ```LazyListState``` which should be attached to a scrollable that accepts it, for example a ```LazyColumn```.
188 |
189 | ```kotlin
190 | LazyColumn(state = syncedListState) {
191 | ...
192 | }
193 | ```
194 |
195 | ### Combined: ###
196 |
197 | (Full example can be found under [compose-app](https://github.com/Ahmad-Hamwi/TabSync/tree/master/compose-app))
198 |
199 | ```kotlin
200 | @Composable
201 | fun MyComposable(categories: List) {
202 | val (selectedTabIndex, setSelectedTabIndex, syncedListState) = lazyListTabSync(categories.indices.toList())
203 |
204 | Column {
205 | ScrollableTabRow(selectedTabIndex) {
206 | categories.forEachIndexed { index, category ->
207 | Tab(
208 | selected = index == selectedTabIndex,
209 | onClick = { setSelectedTabIndex(index) },
210 | ...
211 | )
212 | }
213 | }
214 |
215 | LazyColumn(state = syncedListState) {
216 | ...
217 | }
218 | }
219 | }
220 | ```
221 |
222 | > **_NOTE:_** You don't have to pass the full indices of the list provided as shown in the previous example. You may want to provide a couple of indices from your list's items to sync the tabs with:
223 | > ```kotlin
224 | > // Syncing the first tab with the item of index 0, the second one with the item of
225 | > // index 2, and the third with the item of index 4
226 | > val (selectedTabIndex, setSelectedTabIndex, syncedListState) = lazyListTabSync(mutableListOf(0, 2, 4))
227 | > ```
228 |
229 | ### Additional arguments ###
230 |
231 | - By default, the list smooth scrolls when the selected tab changes, if you would like to stop the smooth scrolling, you can pass an optional ```smoothScroll``` flag:
232 | - ```tabsCount``` can be used to check for the viability of the synchronization with the tabs, the optimal case is that the number of tabs that we're syncing with is the same as the number of indices provided. (You cannot have a number of tabs lower than the number of indices provided, use ```tabsCount``` to make sure you're not doing that).
233 | - ```lazyListState``` can be used if you would like to provide your own state, the one coming from the destructuring declaration is going to be the same.
234 |
235 | ```kotlin
236 | @Composable
237 | fun MyComposable(items: List
- ) {
238 |
239 | val (selectedTabIndex, setSelectedTabIndex, listState) = tabSyncMediator(
240 | mutableListOf(0, 2, 4), //Mandatory. The indices of lazy list items to sync the tabs with
241 | tabsCount = 3, //Optional. To check for viability of the synchronization with the tabs. Optimal when equals the count of syncedIndices.
242 | lazyListState = rememberLazyListState(), //Optional. To provide your own LazyListState. Defaults to rememberLazyListState().
243 | smoothScroll = true, // Optional. To make the auto scroll smooth or not when clicking tabs. Defaults to true
244 | )
245 |
246 | }
247 | ```
248 |
249 | # Contributing #
250 | This library is made to help other developers out in their app developments, feel free to contribute by suggesting ideas and creating issues and PRs that would make this repository more helpful.
251 |
252 | # License
253 |
254 | Copyright (C) 2023 Ahmad Hamwi
255 |
256 | Licensed under the Apache License, Version 2.0
257 |
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