Send reaction view quick react and picker

+ fix / Error when to many reactions in cells (more than placeholders -8-)
+ fix / DefaultTimeline quick map access was not shifted when items inserted at given index

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/send/SendService.kt

@@ -49,4 +49,6 @@ interface SendService {
     fun sendMedias(attachments: List<ContentAttachmentData>): Cancelable
 
 
+    fun sendReaction(reaction: String, targetEventId: String) : Cancelable
+
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomAPI.kt

@@ -18,6 +18,7 @@ package im.vector.matrix.android.internal.session.room
 
 import im.vector.matrix.android.api.session.events.model.Content
 import im.vector.matrix.android.api.session.events.model.Event
+import im.vector.matrix.android.api.session.room.model.annotation.ReactionContent
 import im.vector.matrix.android.api.session.room.model.create.CreateRoomParams
 import im.vector.matrix.android.api.session.room.model.create.CreateRoomResponse
 import im.vector.matrix.android.internal.network.NetworkConstants
@@ -156,4 +157,20 @@ internal interface RoomAPI {
                        @Path("state_event_type") stateEventType: String,
                        @Path("state_key") stateKey: String,
                        @Body params: Map<String, String>): Call<Unit>
+
+    /**
+     * Send a relation event to a room.
+     *
+     * @param txId      the transaction Id
+     * @param roomId    the room id
+     * @param eventType the event type
+     * @param content   the event content
+     */
+    @POST(NetworkConstants.URI_API_PREFIX_PATH_R0 + "rooms/{roomId}/send_relation/{parent_id}/{relation_type}/{event_type}")
+    fun sendRelation(@Path("roomId") roomId: String,
+                     @Path("parentId") parent_id: String,
+                     @Path("relation_type") relationType: String,
+                     @Path("eventType") eventType: String,
+                     @Body content: Content?
+    ): Call<SendResponse>
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/DefaultSendService.kt

@@ -74,6 +74,18 @@ internal class DefaultSendService(private val roomId: String,
         return cancelableBag
     }
 
+
+    override fun sendReaction(reaction: String, targetEventId: String) : Cancelable {
+        val event = eventFactory.createReactionEvent(roomId,targetEventId,reaction).also {
+            saveLocalEcho(it)
+        }
+        val sendRelationWork = createSendRelationWork(event)
+        WorkManager.getInstance()
+                .beginUniqueWork(buildWorkIdentifier(SEND_WORK), ExistingWorkPolicy.APPEND, sendRelationWork)
+                .enqueue()
+        return CancelableWork(sendRelationWork.id)
+    }
+
     override fun sendMedia(attachment: ContentAttachmentData): Cancelable {
         // Create an event with the media file path
         val event = eventFactory.createMediaEvent(roomId, attachment).also {
@@ -116,6 +128,19 @@ internal class DefaultSendService(private val roomId: String,
                 .build()
     }
 
+    private fun createSendRelationWork(event: Event): OneTimeWorkRequest {
+        //TODO use the new API to send relation (for now use regular send)
+        val sendContentWorkerParams = SendEventWorker.Params(
+                roomId, event)
+        val sendWorkData = WorkerParamsFactory.toData(sendContentWorkerParams)
+
+        return OneTimeWorkRequestBuilder<SendEventWorker>()
+                .setConstraints(WORK_CONSTRAINTS)
+                .setInputData(sendWorkData)
+                .setBackoffCriteria(BackoffPolicy.LINEAR, BACKOFF_DELAY, TimeUnit.MILLISECONDS)
+                .build()
+    }
+
     private fun createUploadMediaWork(event: Event, attachment: ContentAttachmentData): OneTimeWorkRequest {
         val uploadMediaWorkerParams = UploadContentWorker.Params(roomId, event, attachment)
         val uploadWorkData = WorkerParamsFactory.toData(uploadMediaWorkerParams)

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/LocalEchoEventFactory.kt

@@ -21,18 +21,11 @@ import im.vector.matrix.android.api.auth.data.Credentials
 import im.vector.matrix.android.api.session.content.ContentAttachmentData
 import im.vector.matrix.android.api.session.events.model.Event
 import im.vector.matrix.android.api.session.events.model.EventType
+import im.vector.matrix.android.api.session.events.model.RelationType
 import im.vector.matrix.android.api.session.events.model.toContent
-import im.vector.matrix.android.api.session.room.model.message.AudioInfo
+import im.vector.matrix.android.api.session.room.model.annotation.ReactionContent
-import im.vector.matrix.android.api.session.room.model.message.FileInfo
+import im.vector.matrix.android.api.session.room.model.annotation.ReactionInfo
-import im.vector.matrix.android.api.session.room.model.message.ImageInfo
+import im.vector.matrix.android.api.session.room.model.message.*
-import im.vector.matrix.android.api.session.room.model.message.MessageAudioContent
-import im.vector.matrix.android.api.session.room.model.message.MessageFileContent
-import im.vector.matrix.android.api.session.room.model.message.MessageImageContent
-import im.vector.matrix.android.api.session.room.model.message.MessageTextContent
-import im.vector.matrix.android.api.session.room.model.message.MessageType
-import im.vector.matrix.android.api.session.room.model.message.MessageVideoContent
-import im.vector.matrix.android.api.session.room.model.message.ThumbnailInfo
-import im.vector.matrix.android.api.session.room.model.message.VideoInfo
 import im.vector.matrix.android.internal.session.content.ThumbnailExtractor
 
 internal class LocalEchoEventFactory(private val credentials: Credentials) {
@@ -51,6 +44,25 @@ internal class LocalEchoEventFactory(private val credentials: Credentials) {
         }
     }
 
+    fun createReactionEvent(roomId: String, targetEventId: String, reaction: String): Event {
+        val content = ReactionContent(
+                ReactionInfo(
+                        RelationType.ANNOTATION,
+                        targetEventId,
+                        reaction
+                )
+        )
+        return Event(
+                roomId = roomId,
+                originServerTs = dummyOriginServerTs(),
+                sender = credentials.userId,
+                eventId = dummyEventId(roomId),
+                type = EventType.REACTION,
+                content = content.toContent()
+        )
+    }
+
+
     private fun createImageEvent(roomId: String, attachment: ContentAttachmentData): Event {
         val content = MessageImageContent(
                 type = MessageType.MSGTYPE_IMAGE,

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/SendRelationWorker.kt

@@ -0,0 +1,55 @@
+package im.vector.matrix.android.internal.session.room.send
+
+import android.content.Context
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+import com.squareup.moshi.JsonClass
+import im.vector.matrix.android.api.session.events.model.Event
+import im.vector.matrix.android.api.session.events.model.toModel
+import im.vector.matrix.android.api.session.room.model.annotation.ReactionContent
+import im.vector.matrix.android.api.session.room.model.annotation.ReactionInfo
+import im.vector.matrix.android.internal.di.MatrixKoinComponent
+import im.vector.matrix.android.internal.network.executeRequest
+import im.vector.matrix.android.internal.session.room.RoomAPI
+import im.vector.matrix.android.internal.util.WorkerParamsFactory
+import org.koin.standalone.inject
+
+class SendRelationWorker(context: Context, params: WorkerParameters)
+    : Worker(context, params), MatrixKoinComponent {
+
+
+    @JsonClass(generateAdapter = true)
+    internal data class Params(
+            val roomId: String,
+            val event: Event,
+            val relationType: String? = null
+    )
+
+    private val roomAPI by inject<RoomAPI>()
+
+    override fun doWork(): Result {
+        val params = WorkerParamsFactory.fromData<SendRelationWorker.Params>(inputData)
+                ?: return Result.failure()
+
+        val localEvent = params.event
+        if (localEvent.eventId == null) {
+            return Result.failure()
+        }
+        val relationContent = localEvent.content.toModel<ReactionContent>()
+                ?: return Result.failure()
+        val relatedEventId = relationContent.relatesTo?.eventId ?: return Result.failure()
+        val relationType = (relationContent.relatesTo as? ReactionInfo)?.type ?: params.relationType
+        ?: return Result.failure()
+
+        val result = executeRequest<SendResponse> {
+            apiCall = roomAPI.sendRelation(
+                    roomId = params.roomId,
+                    parent_id = relatedEventId,
+                    relationType = relationType,
+                    eventType = localEvent.type,
+                    content = localEvent.content
+            )
+        }
+        return result.fold({ Result.retry() }, { Result.success() })
+    }
+}

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/DefaultTimeline.kt

@@ -419,6 +419,8 @@ internal class DefaultTimeline(
             val timelineEvent = timelineEventFactory.create(eventEntity)
             val position = if (direction == Timeline.Direction.FORWARDS) 0 else builtEvents.size
             builtEvents.add(position, timelineEvent)
+            //Need to shift :/
+            builtEventsIdMap.entries.filter { it.value >= position }.forEach { it.setValue(it.value + 1) }
             builtEventsIdMap[eventEntity.eventId] = position
         }
         Timber.v("Built ${offsetResults.size} items from db")

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailActions.kt

@@ -28,4 +28,8 @@ sealed class RoomDetailActions {
     data class EventDisplayed(val event: TimelineEvent) : RoomDetailActions()
     data class LoadMore(val direction: Timeline.Direction) : RoomDetailActions()
 
+    data class SendReaction(val reaction: String, val targetEventId: String) : RoomDetailActions()
+
+
+
 }

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailFragment.kt

@@ -107,6 +107,7 @@ data class RoomDetailArgs(
 private const val CAMERA_VALUE_TITLE = "attachment"
 private const val REQUEST_FILES_REQUEST_CODE = 0
 private const val TAKE_IMAGE_REQUEST_CODE = 1
+private const val REACTION_SELECT_REQUEST_CODE = 2
 
 class RoomDetailFragment :
         VectorBaseFragment(),
@@ -182,6 +183,12 @@ class RoomDetailFragment :
         if (resultCode == RESULT_OK && data != null) {
             when (requestCode) {
                 REQUEST_FILES_REQUEST_CODE, TAKE_IMAGE_REQUEST_CODE -> handleMediaIntent(data)
+                REACTION_SELECT_REQUEST_CODE -> {
+                    val eventId = data.getStringExtra(EmojiReactionPickerActivity.EXTRA_EVENT_ID) ?: return
+                    val reaction = data.getStringExtra(EmojiReactionPickerActivity.EXTRA_REACTION_RESULT) ?: return
+                    //TODO check if already reacted with that?
+                    roomDetailViewModel.process(RoomDetailActions.SendReaction(reaction,eventId))
+                }
             }
         }
     }
@@ -487,7 +494,8 @@ class RoomDetailFragment :
 
             when (actionData.actionId) {
                 MessageMenuViewModel.ACTION_ADD_REACTION -> {
-                    startActivityForResult(EmojiReactionPickerActivity.intent(requireContext()), 0)
+                    val eventId = actionData.data?.toString() ?: return
+                    startActivityForResult(EmojiReactionPickerActivity.intent(requireContext(), eventId), REACTION_SELECT_REQUEST_CODE)
                 }
                 MessageMenuViewModel.ACTION_COPY -> {
                     //I need info about the current selected message :/
@@ -539,6 +547,11 @@ class RoomDetailFragment :
                             .setPositiveButton(R.string.ok) { dialog, id -> dialog.cancel() }
                             .show()
                 }
+                MessageMenuViewModel.ACTION_QUICK_REACT -> {
+                    (actionData.data as? Pair<String, String>)?.let { pairData ->
+                        roomDetailViewModel.process(RoomDetailActions.SendReaction(pairData.second, pairData.first))
+                    }
+                }
                 else -> {
                     Toast.makeText(context, "Action ${actionData.actionId} not implemented", Toast.LENGTH_LONG).show()
                 }

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailViewModel.kt

@@ -74,6 +74,7 @@ class RoomDetailViewModel(initialState: RoomDetailViewState,
             is RoomDetailActions.SendMedia -> handleSendMedia(action)
             is RoomDetailActions.EventDisplayed -> handleEventDisplayed(action)
             is RoomDetailActions.LoadMore -> handleLoadMore(action)
+            is RoomDetailActions.SendReaction -> handleSendReaction(action)
         }
     }
 
@@ -179,6 +180,11 @@ class RoomDetailViewModel(initialState: RoomDetailViewState,
         })
     }
 
+
+    private fun handleSendReaction(action: RoomDetailActions.SendReaction) {
+        room.sendReaction(action.reaction,action.targetEventId)
+    }
+
     private fun handleSendMedia(action: RoomDetailActions.SendMedia) {
         val attachments = action.mediaFiles.map {
             ContentAttachmentData(

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/action/MessageActionsBottomSheet.kt

@@ -95,8 +95,13 @@ class MessageActionsBottomSheet : BaseMvRxBottomSheetDialog() {
                     .commit()
         }
         quickReactionFragment.interactionListener = object : QuickReactionFragment.InteractionListener {
-            override fun didQuickReactWith(reactions: List<String>) {
+            override fun didQuickReactWith(clikedOn: String, reactions: List<String>, eventId: String) {
-                actionHandlerModel.fireAction("Quick React", reactions)
+                if (reactions.contains(clikedOn)) {
+                    //it's an add
+                    actionHandlerModel.fireAction(MessageMenuViewModel.ACTION_QUICK_REACT, Pair(eventId,clikedOn))
+                } else {
+                    //it's a remove
+                }
                 dismiss()
             }
         }

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/action/MessageMenuViewModel.kt

@@ -67,7 +67,7 @@ class MessageMenuViewModel(initialState: MessageMenuState) : VectorViewModel<Mes
 
             //TODO determine if can copy, forward, reply, quote, report?
             val actions = ArrayList<SimpleAction>().apply {
-                this.add(SimpleAction(ACTION_ADD_REACTION, R.string.message_add_reaction, R.drawable.ic_smile))
+                this.add(SimpleAction(ACTION_ADD_REACTION, R.string.message_add_reaction, R.drawable.ic_smile, event.root.eventId))
                 if (canCopy(type)) {
                     //TODO copy images? html? see ClipBoard
                     this.add(SimpleAction(ACTION_COPY, R.string.copy, R.drawable.ic_copy, messageContent.body))
@@ -184,6 +184,7 @@ class MessageMenuViewModel(initialState: MessageMenuState) : VectorViewModel<Mes
         const val VIEW_DECRYPTED_SOURCE = "VIEW_DECRYPTED_SOURCE"
         const val PERMALINK = "PERMALINK"
         const val ACTION_FLAG = "ACTION_FLAG"
+        const val ACTION_QUICK_REACT = "ACTION_QUICK_REACT"
 
 
     }

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/action/QuickReactionFragment.kt

@@ -119,12 +119,12 @@ class QuickReactionFragment : BaseMvRxFragment() {
         }
 
         if (it.selectionResult != null) {
-            interactionListener?.didQuickReactWith(it.selectionResult)
+            interactionListener?.didQuickReactWith(it.selectionResult.first, it.selectionResult.second, it.eventId)
         }
     }
 
     interface InteractionListener {
-        fun didQuickReactWith(reactions: List<String>)
+        fun didQuickReactWith(clikedOn: String, reactions: List<String>, eventId: String)
     }
 
     companion object {

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/action/QuickReactionViewModel.kt

@@ -31,7 +31,12 @@ enum class TriggleState {
     SECOND
 }
 
-data class QuickReactionState(val agreeTrigleState: TriggleState, val likeTriggleState: TriggleState, val selectionResult: List<String>? = null) : MvRxState
+data class QuickReactionState(
+        val agreeTrigleState: TriggleState,
+        val likeTriggleState: TriggleState,
+        /** Pair of 'clickedOn' and current toggles state*/
+        val selectionResult: Pair<String, List<String>>? = null,
+        val eventId: String) : MvRxState
 
 /**
  * Quick reaction view model
@@ -43,16 +48,18 @@ class QuickReactionViewModel(initialState: QuickReactionState) : VectorViewModel
     fun toggleAgree(isFirst: Boolean) = withState {
         if (isFirst) {
             setState {
+                val newTriggle = if (it.agreeTrigleState == TriggleState.FIRST) TriggleState.NONE else TriggleState.FIRST
                 copy(
-                        agreeTrigleState = if (it.agreeTrigleState == TriggleState.FIRST) TriggleState.NONE else TriggleState.FIRST,
+                        agreeTrigleState = newTriggle,
-                        selectionResult = getReactions(this)
+                        selectionResult = Pair(agreePositive, getReactions(this, newTriggle, null))
                 )
             }
         } else {
             setState {
+                val newTriggle = if (it.agreeTrigleState == TriggleState.SECOND) TriggleState.NONE else TriggleState.SECOND
                 copy(
-                        agreeTrigleState = if (it.agreeTrigleState == TriggleState.SECOND) TriggleState.NONE else TriggleState.SECOND,
+                        agreeTrigleState = agreeTrigleState,
-                        selectionResult = getReactions(this)
+                        selectionResult = Pair(agreeNegative, getReactions(this, newTriggle, null))
                 )
             }
         }
@@ -61,30 +68,32 @@ class QuickReactionViewModel(initialState: QuickReactionState) : VectorViewModel
     fun toggleLike(isFirst: Boolean) = withState {
         if (isFirst) {
             setState {
+                val newTriggle = if (it.likeTriggleState == TriggleState.FIRST) TriggleState.NONE else TriggleState.FIRST
                 copy(
-                        likeTriggleState = if (it.likeTriggleState == TriggleState.FIRST) TriggleState.NONE else TriggleState.FIRST,
+                        likeTriggleState = newTriggle,
-                        selectionResult = getReactions(this)
+                        selectionResult = Pair(likePositive, getReactions(this, null, newTriggle))
                 )
             }
         } else {
             setState {
+                val newTriggle = if (it.likeTriggleState == TriggleState.SECOND) TriggleState.NONE else TriggleState.SECOND
                 copy(
-                        likeTriggleState = if (it.likeTriggleState == TriggleState.SECOND) TriggleState.NONE else TriggleState.SECOND,
+                        likeTriggleState = newTriggle,
-                        selectionResult = getReactions(this)
+                        selectionResult = Pair(likeNegative, getReactions(this, null, newTriggle))
                 )
             }
         }
     }
 
-    private fun getReactions(state: QuickReactionState): List<String> {
+    private fun getReactions(state: QuickReactionState, newState1: TriggleState?, newState2: TriggleState?): List<String> {
         return ArrayList<String>(4).apply {
-            when (state.likeTriggleState) {
+            when (newState2 ?: state.likeTriggleState) {
                 TriggleState.FIRST -> add(likePositive)
                 TriggleState.SECOND -> add(likeNegative)
                 else -> {
                 }
             }
-            when (state.agreeTrigleState) {
+            when (newState1 ?: state.agreeTrigleState) {
                 TriggleState.FIRST -> add(agreePositive)
                 TriggleState.SECOND -> add(agreeNegative)
                 else -> {
@@ -126,7 +135,7 @@ class QuickReactionViewModel(initialState: QuickReactionState) : VectorViewModel
                     }
                 }
             }
-            return QuickReactionState(agreeTriggle, likeTriggle)
+            return QuickReactionState(agreeTriggle, likeTriggle, null, event.root.eventId ?: "")
         }
     }
 }

vector/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/item/AbsMessageItem.kt

@@ -88,8 +88,8 @@ abstract class AbsMessageItem<H : AbsMessageItem.Holder> : BaseEventItem<H>() {
             //clear all reaction buttons (but not the Flow helper!)
             holder.reactionWrapper?.children?.forEach { (it as? ReactionButton)?.isGone = true }
             val idToRefInFlow = ArrayList<Int>()
-            informationData.orderedReactionList?.forEachIndexed { index, reaction ->
+            informationData.orderedReactionList?.chunked(7)?.firstOrNull()?.forEachIndexed { index, reaction ->
-                (holder.reactionWrapper?.children?.elementAt(index) as? ReactionButton)?.let { reactionButton ->
+                (holder.reactionWrapper?.children?.elementAtOrNull(index) as? ReactionButton)?.let { reactionButton ->
                     reactionButton.isVisible = true
                     idToRefInFlow.add(reactionButton.id)
                     reactionButton.reactionString = reaction.first

vector/src/main/java/im/vector/riotredesign/features/reactions/EmojiChooserViewModel.kt

@@ -18,19 +18,31 @@ package im.vector.riotredesign.features.reactions
 import android.content.Context
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import im.vector.riotredesign.core.utils.LiveEvent
 
 class EmojiChooserViewModel : ViewModel() {
 
     var adapter: EmojiRecyclerAdapter? = null
     val emojiSourceLiveData: MutableLiveData<EmojiDataSource> = MutableLiveData()
 
+    val navigateEvent: MutableLiveData<LiveEvent<String>> = MutableLiveData()
+    var selectedReaction: String? = null
+    var eventId: String? = null
+
     val currentSection: MutableLiveData<Int> = MutableLiveData()
 
+    var reactionClickListener = object : ReactionClickListener {
+        override fun onReactionSelected(reaction: String) {
+            selectedReaction = reaction
+            navigateEvent.value = LiveEvent(NAVIGATE_FINISH)
+        }
+    }
+
     fun initWithContect(context: Context) {
         //TODO load async
         val emojiDataSource = EmojiDataSource(context)
         emojiSourceLiveData.value = emojiDataSource
-        adapter = EmojiRecyclerAdapter(emojiDataSource)
+        adapter = EmojiRecyclerAdapter(emojiDataSource, reactionClickListener)
         adapter?.interactionListener = object : EmojiRecyclerAdapter.InteractionListener {
             override fun firstVisibleSectionChange(section: Int) {
                 currentSection.value = section
@@ -42,4 +54,8 @@ class EmojiChooserViewModel : ViewModel() {
     fun scrollToSection(sectionIndex: Int) {
         adapter?.scrollToSection(sectionIndex)
     }
+
+    companion object {
+        const val NAVIGATE_FINISH = "NAVIGATE_FINISH"
+    }
 }

vector/src/main/java/im/vector/riotredesign/features/reactions/EmojiReactionPickerActivity.kt

@@ -15,6 +15,7 @@
  */
 package im.vector.riotredesign.features.reactions
 
+import android.app.Activity
 import android.content.Context
 import android.content.Intent
 import android.graphics.Typeface
@@ -88,6 +89,8 @@ class EmojiReactionPickerActivity : VectorBaseActivity() {
 
         viewModel = ViewModelProviders.of(this).get(EmojiChooserViewModel::class.java)
 
+        viewModel.eventId = intent.getStringExtra(EXTRA_EVENT_ID)
+
         viewModel.emojiSourceLiveData.observe(this, Observer {
             it.rawData?.categories?.let { categories ->
                 for (category in categories) {
@@ -106,6 +109,19 @@ class EmojiReactionPickerActivity : VectorBaseActivity() {
                 tabLayout.addOnTabSelectedListener(tabLayoutSelectionListener)
             }
         })
+
+        viewModel.navigateEvent.observe(this, Observer {
+            it.getContentIfNotHandled()?.let {
+                if (it == EmojiChooserViewModel.NAVIGATE_FINISH) {
+                    //finish with result
+                    val dataResult = Intent()
+                    dataResult.putExtra(EXTRA_REACTION_RESULT, viewModel.selectedReaction)
+                    dataResult.putExtra(EXTRA_EVENT_ID, viewModel.eventId)
+                    setResult(Activity.RESULT_OK, dataResult)
+                    finish()
+                }
+            }
+        })
     }
 
     private fun requestEmojivUnicode10CompatibleFont() {
@@ -172,9 +188,13 @@ class EmojiReactionPickerActivity : VectorBaseActivity() {
     }
 
     companion object {
-        fun intent(context: Context): Intent {
+
+        const val EXTRA_EVENT_ID = "EXTRA_EVENT_ID"
+        const val EXTRA_REACTION_RESULT = "EXTRA_REACTION_RESULT"
+
+        fun intent(context: Context, eventId: String): Intent {
             val intent = Intent(context, EmojiReactionPickerActivity::class.java)
-//            intent.putExtra(EXTRA_MATRIX_ID, matrixID)
+            intent.putExtra(EXTRA_EVENT_ID, eventId)
             return intent
         }
     }

vector/src/main/java/im/vector/riotredesign/features/reactions/EmojiRecyclerAdapter.kt

@@ -43,7 +43,7 @@ import kotlin.math.abs
  * TODO: Performances
  * TODO: Scroll to section - Find a way to snap section to the top
  */
-class EmojiRecyclerAdapter(val dataSource: EmojiDataSource? = null) :
+class EmojiRecyclerAdapter(val dataSource: EmojiDataSource? = null, var reactionClickListener: ReactionClickListener?) :
         RecyclerView.Adapter<EmojiRecyclerAdapter.ViewHolder>() {
 
     var interactionListener: InteractionListener? = null
@@ -64,6 +64,22 @@ class EmojiRecyclerAdapter(val dataSource: EmojiDataSource? = null) :
 
     val toUpdateWhenNotBusy = ArrayList<Pair<String, EmojiViewHolder>>()
 
+    val itemClickListener = View.OnClickListener { view ->
+        mRecyclerView?.getChildLayoutPosition(view)?.let { itemPosition ->
+            if (itemPosition != RecyclerView.NO_POSITION) {
+                val categories = dataSource?.rawData?.categories ?: return@OnClickListener
+                val sectionNumber = getSectionForAbsoluteIndex(itemPosition)
+                if (!isSection(itemPosition)) {
+                    val sectionMojis = categories[sectionNumber].emojis
+                    val sectionOffset = getSectionOffset(sectionNumber)
+                    val emoji = sectionMojis[itemPosition - sectionOffset]
+                    val item = dataSource.rawData!!.emojis.getValue(emoji).emojiString()
+                    reactionClickListener?.onReactionSelected(item)
+                }
+            }
+        }
+    }
+
 
     override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
         super.onAttachedToRecyclerView(recyclerView)
@@ -113,6 +129,7 @@ class EmojiRecyclerAdapter(val dataSource: EmojiDataSource? = null) :
         beginTraceSession("MyAdapter.onCreateViewHolder")
         val inflater = LayoutInflater.from(parent.context)
         val itemView = inflater.inflate(viewType, parent, false)
+        itemView.setOnClickListener(itemClickListener)
         val viewHolder = when (viewType) {
             R.layout.grid_section_header -> SectionViewHolder(itemView)
             else -> EmojiViewHolder(itemView)

vector/src/main/java/im/vector/riotredesign/features/reactions/ReactionClickListener.kt

@@ -0,0 +1,5 @@
+package im.vector.riotredesign.features.reactions
+
+interface ReactionClickListener {
+    fun onReactionSelected(reaction: String)
+}