Merge branch 'develop-2.x' into emoji-empty-view

app/src/main/java/chat/rocket/android/chatroom/adapter/CommandSuggestionsAdapter.kt

+package chat.rocket.android.chatroom.adapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import chat.rocket.android.R
+import chat.rocket.android.chatroom.adapter.CommandSuggestionsAdapter.CommandSuggestionsViewHolder
+import chat.rocket.android.chatroom.viewmodel.suggestion.CommandSuggestionViewModel
+import chat.rocket.android.widget.autocompletion.model.SuggestionModel
+import chat.rocket.android.widget.autocompletion.ui.BaseSuggestionViewHolder
+import chat.rocket.android.widget.autocompletion.ui.SuggestionsAdapter
+
+class CommandSuggestionsAdapter : SuggestionsAdapter<CommandSuggestionsViewHolder>(token = "/",
+        constraint = CONSTRAINT_BOUND_TO_START, threshold = UNLIMITED_RESULT_COUNT) {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CommandSuggestionsViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.suggestion_command_item, parent,
+                false)
+        return CommandSuggestionsViewHolder(view)
+    }
+
+    class CommandSuggestionsViewHolder(view: View) : BaseSuggestionViewHolder(view) {
+
+        override fun bind(item: SuggestionModel, itemClickListener: SuggestionsAdapter.ItemClickListener?) {
+            item as CommandSuggestionViewModel
+            with(itemView) {
+                val nameTextView = itemView.findViewById<TextView>(R.id.text_command_name)
+                val descriptionTextView = itemView.findViewById<TextView>(R.id.text_command_description)
+                nameTextView.text = "/${item.text}"
+                val res = context.resources
+                val id = res.getIdentifier(item.description, "string", context.packageName)
+                val description = if (id > 0) res.getString(id) else ""
+                descriptionTextView.text = description.toLowerCase()
+                setOnClickListener {
+                    itemClickListener?.onClick(item)
+                }
+            }
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/adapter/PeopleSuggestionsAdapter.kt

@@ -8,7 +8,7 @@ import android.widget.ImageView
 import android.widget.TextView
 import chat.rocket.android.R
 import chat.rocket.android.chatroom.adapter.PeopleSuggestionsAdapter.PeopleSuggestionViewHolder
-import chat.rocket.android.chatroom.viewmodel.PeopleViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.PeopleSuggestionViewModel
 import chat.rocket.android.util.extensions.setVisible
 import chat.rocket.android.widget.autocompletion.model.SuggestionModel
 import chat.rocket.android.widget.autocompletion.ui.BaseSuggestionViewHolder
@@ -26,7 +26,7 @@ class PeopleSuggestionsAdapter : SuggestionsAdapter<PeopleSuggestionViewHolder>(
     class PeopleSuggestionViewHolder(view: View) : BaseSuggestionViewHolder(view) {
 
         override fun bind(item: SuggestionModel, itemClickListener: SuggestionsAdapter.ItemClickListener?) {
-            item as PeopleViewModel
+            item as PeopleSuggestionViewModel
             with(itemView) {
                 val username = itemView.findViewById<TextView>(R.id.text_username)
                 val name = itemView.findViewById<TextView>(R.id.text_name)

app/src/main/java/chat/rocket/android/chatroom/adapter/RoomSuggestionsAdapter.kt

@@ -6,7 +6,7 @@ import android.view.ViewGroup
 import android.widget.TextView
 import chat.rocket.android.R
 import chat.rocket.android.chatroom.adapter.RoomSuggestionsAdapter.RoomSuggestionsViewHolder
-import chat.rocket.android.chatroom.viewmodel.ChatRoomViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.ChatRoomSuggestionViewModel
 import chat.rocket.android.widget.autocompletion.model.SuggestionModel
 import chat.rocket.android.widget.autocompletion.ui.BaseSuggestionViewHolder
 import chat.rocket.android.widget.autocompletion.ui.SuggestionsAdapter
@@ -22,7 +22,7 @@ class RoomSuggestionsAdapter : SuggestionsAdapter<RoomSuggestionsViewHolder>("#"
     class RoomSuggestionsViewHolder(view: View) : BaseSuggestionViewHolder(view) {
 
         override fun bind(item: SuggestionModel, itemClickListener: SuggestionsAdapter.ItemClickListener?) {
-            item as ChatRoomViewModel
+            item as ChatRoomSuggestionViewModel
             with(itemView) {
                 val fullname = itemView.findViewById<TextView>(R.id.text_fullname)
                 val name = itemView.findViewById<TextView>(R.id.text_name)

app/src/main/java/chat/rocket/android/chatroom/presentation/ChatRoomPresenter.kt

@@ -6,9 +6,10 @@ import chat.rocket.android.chatroom.adapter.AutoCompleteType
 import chat.rocket.android.chatroom.adapter.PEOPLE
 import chat.rocket.android.chatroom.adapter.ROOMS
 import chat.rocket.android.chatroom.domain.UriInteractor
-import chat.rocket.android.chatroom.viewmodel.ChatRoomViewModel
-import chat.rocket.android.chatroom.viewmodel.PeopleViewModel
 import chat.rocket.android.chatroom.viewmodel.ViewModelMapper
+import chat.rocket.android.chatroom.viewmodel.suggestion.ChatRoomSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.CommandSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.PeopleSuggestionViewModel
 import chat.rocket.android.core.lifecycle.CancelStrategy
 import chat.rocket.android.helper.UrlHelper
 import chat.rocket.android.infrastructure.LocalRepository
@@ -23,6 +24,7 @@ import chat.rocket.common.model.roomTypeOf
 import chat.rocket.common.util.ifNull
 import chat.rocket.core.internal.realtime.State
 import chat.rocket.core.internal.rest.*
+import chat.rocket.core.model.Command
 import chat.rocket.core.model.Message
 import chat.rocket.core.model.Value
 import kotlinx.coroutines.experimental.CommonPool
@@ -363,7 +365,7 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
                 // Take at most the 100 most recent messages distinguished by user. Can return less.
                 val recentMessages = messagesRepository.getRecentMessages(chatRoomId, 100)
                         .filterNot { filterSelfOut && it.sender?.username == self }
-                val activeUsers = mutableListOf<PeopleViewModel>()
+                val activeUsers = mutableListOf<PeopleSuggestionViewModel>()
                 recentMessages.forEach {
                     val sender = it.sender!!
                     val username = sender.username ?: ""
@@ -372,7 +374,7 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
                     val found = members.firstOrNull { member -> member.username == username }
                     val status = if (found != null) found.status else UserStatus.Offline()
                     val searchList = mutableListOf(username, name)
-                    activeUsers.add(PeopleViewModel(avatarUrl, username, username, name, status,
+                    activeUsers.add(PeopleSuggestionViewModel(avatarUrl, username, username, name, status,
                             true, searchList))
                 }
                 // Filter out from members list the active users.
@@ -387,10 +389,10 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
                     val name = it.name ?: ""
                     val avatarUrl = UrlHelper.getAvatarUrl(currentServer, username)
                     val searchList = mutableListOf(username, name)
-                    PeopleViewModel(avatarUrl, username, username, name, it.status, true, searchList)
+                    PeopleSuggestionViewModel(avatarUrl, username, username, name, it.status, true, searchList)
                 })
 
-                view.populateMembers(activeUsers)
+                view.populatePeopleSuggestions(activeUsers)
             } catch (e: RocketChatException) {
                 Timber.e(e)
             }
@@ -407,12 +409,12 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
                             usersRepository.saveAll(users)
                         }
                         val self = localRepository.get(LocalRepository.USERNAME_KEY)
-                        view.populateMembers(users.map {
+                        view.populatePeopleSuggestions(users.map {
                             val username = it.username ?: ""
                             val name = it.name ?: ""
                             val searchList = mutableListOf(username, name)
                             it.emails?.forEach { email -> searchList.add(email.address) }
-                            PeopleViewModel(UrlHelper.getAvatarUrl(currentServer, username),
+                            PeopleSuggestionViewModel(UrlHelper.getAvatarUrl(currentServer, username),
                                     username, username, name, it.status, false, searchList)
                         }.filterNot { filterSelfOut && self != null && self == it.text })
                     }
@@ -420,11 +422,11 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
                         if (rooms.isNotEmpty()) {
                             roomsRepository.saveAll(rooms)
                         }
-                        view.populateRooms(rooms.map {
+                        view.populateRoomSuggestions(rooms.map {
                             val fullName = it.fullName ?: ""
                             val name = it.name ?: ""
                             val searchList = mutableListOf(fullName, name)
-                            ChatRoomViewModel(name, fullName, name, searchList)
+                            ChatRoomSuggestionViewModel(name, fullName, name, searchList)
                         })
                     }
                 }
@@ -446,14 +448,14 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
                         .map { chatRoom ->
                             val name = chatRoom.name
                             val fullName = chatRoom.fullName ?: ""
-                            ChatRoomViewModel(
+                            ChatRoomSuggestionViewModel(
                                     text = name,
                                     name = name,
                                     fullName = fullName,
                                     searchList = listOf(name, fullName)
                             )
                         }
-                view.populateRooms(chatRooms)
+                view.populateRoomSuggestions(chatRooms)
             } catch (e: RocketChatException) {
                 Timber.e(e)
             }
@@ -488,6 +490,50 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
         view.showReactionsPopup(messageId)
     }
 
+    fun loadCommands() {
+        launchUI(strategy) {
+            try {
+                //TODO: cache the commands
+                val commands = client.commands(0, 100).result
+                view.populateCommandSuggestions(commands.map {
+                    println("${it.command} - ${it.description}")
+                    CommandSuggestionViewModel(it.command, it.description ?: "", listOf(it.command))
+                })
+            } catch (ex: RocketChatException) {
+                Timber.e(ex)
+            }
+        }
+    }
+
+    fun runCommand(text: String, roomId: String) {
+        launchUI(strategy) {
+            try {
+                if (text.length == 1) {
+                    // we have just the slash, post it anyway
+                    sendMessage(roomId, text, null)
+                } else {
+                    val command = text.split(" ")
+                    val name = command[0].substring(1)
+                    var params: String = ""
+                    command.forEachIndexed { index, param ->
+                        if (index > 0) {
+                            params += "$param "
+                        }
+                    }
+                    val result = client.runCommand(Command(name, params), roomId)
+                    if (!result) {
+                        // failed, command is not valid so post it
+                        sendMessage(roomId, text, null)
+                    }
+                }
+            } catch (ex: RocketChatException) {
+                Timber.e(ex)
+                // command is not valid, post it
+                sendMessage(roomId, text, null)
+            }
+        }
+    }
+
     private fun updateMessage(streamedMessage: Message) {
         launchUI(strategy) {
             val viewModelStreamedMessage = mapper.map(streamedMessage)

app/src/main/java/chat/rocket/android/chatroom/presentation/ChatRoomView.kt

@@ -2,8 +2,9 @@ package chat.rocket.android.chatroom.presentation
 
 import android.net.Uri
 import chat.rocket.android.chatroom.viewmodel.BaseViewModel
-import chat.rocket.android.chatroom.viewmodel.ChatRoomViewModel
-import chat.rocket.android.chatroom.viewmodel.PeopleViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.ChatRoomSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.CommandSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.PeopleSuggestionViewModel
 import chat.rocket.android.core.behaviours.LoadingView
 import chat.rocket.android.core.behaviours.MessageView
 import chat.rocket.core.internal.realtime.State
@@ -102,12 +103,19 @@ interface ChatRoomView : LoadingView, MessageView {
     fun showInvalidFileSize(fileSize: Int, maxFileSize: Int)
 
     fun showConnectionState(state: State)
-    fun populateMembers(members: List<PeopleViewModel>)
-    fun populateRooms(chatRooms: List<ChatRoomViewModel>)
+    fun populatePeopleSuggestions(members: List<PeopleSuggestionViewModel>)
+    fun populateRoomSuggestions(chatRooms: List<ChatRoomSuggestionViewModel>)
     /**
      * This user has joined the chat callback.
      */
     fun onJoined()
 
     fun showReactionsPopup(messageId: String)
+
+    /**
+     * Show list of commands.
+     *
+     * @param commands The list of available commands.
+     */
+    fun populateCommandSuggestions(commands: List<CommandSuggestionViewModel>)
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -15,16 +15,14 @@ import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
 import android.view.*
 import chat.rocket.android.R
-import chat.rocket.android.chatroom.adapter.ChatRoomAdapter
-import chat.rocket.android.chatroom.adapter.PEOPLE
-import chat.rocket.android.chatroom.adapter.PeopleSuggestionsAdapter
-import chat.rocket.android.chatroom.adapter.RoomSuggestionsAdapter
+import chat.rocket.android.chatroom.adapter.*
 import chat.rocket.android.chatroom.presentation.ChatRoomPresenter
 import chat.rocket.android.chatroom.presentation.ChatRoomView
 import chat.rocket.android.chatroom.viewmodel.BaseViewModel
-import chat.rocket.android.chatroom.viewmodel.ChatRoomViewModel
 import chat.rocket.android.chatroom.viewmodel.MessageViewModel
-import chat.rocket.android.chatroom.viewmodel.PeopleViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.ChatRoomSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.CommandSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.PeopleSuggestionViewModel
 import chat.rocket.android.helper.EndlessRecyclerViewScrollListener
 import chat.rocket.android.helper.KeyboardHelper
 import chat.rocket.android.helper.MessageParser
@@ -133,6 +131,11 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
         presenter.unsubscribeMessages(chatRoomId)
         handler.removeCallbacksAndMessages(null)
         unsubscribeTextMessage()
+
+        // Hides the keyboard (if it's opened) before going to any view.
+        activity?.apply {
+            hideKeyboard()
+        }
         super.onDestroyView()
     }
 
@@ -218,7 +221,11 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
 
     override fun sendMessage(text: String) {
         if (!text.isBlank()) {
+            if (!text.startsWith("/")) {
                 presenter.sendMessage(chatRoomId, text, editingMessageId)
+            } else {
+                presenter.runCommand(text, chatRoomId)
+            }
         }
     }
 
@@ -287,14 +294,18 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
 
     override fun showGenericErrorMessage() = showMessage(getString(R.string.msg_generic_error))
 
-    override fun populateMembers(members: List<PeopleViewModel>) {
+    override fun populatePeopleSuggestions(members: List<PeopleSuggestionViewModel>) {
         suggestions_view.addItems("@", members)
     }
 
-    override fun populateRooms(chatRooms: List<ChatRoomViewModel>) {
+    override fun populateRoomSuggestions(chatRooms: List<ChatRoomSuggestionViewModel>) {
         suggestions_view.addItems("#", chatRooms)
     }
 
+    override fun populateCommandSuggestions(commands: List<CommandSuggestionViewModel>) {
+        suggestions_view.addItems("/", commands)
+    }
+
     override fun copyToClipboard(message: String) {
         activity?.apply {
             val clipboard = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
@@ -492,9 +503,11 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
     }
 
     private fun setupSuggestionsView() {
-        suggestions_view.anchor(text_message)
-                .bindTokenAdapter(PeopleSuggestionsAdapter())
-                .bindTokenAdapter(RoomSuggestionsAdapter())
+        suggestions_view.anchorTo(text_message)
+                .setMaximumHeight(resources.getDimensionPixelSize(R.dimen.suggestions_box_max_height))
+                .addTokenAdapter(PeopleSuggestionsAdapter())
+                .addTokenAdapter(CommandSuggestionsAdapter())
+                .addTokenAdapter(RoomSuggestionsAdapter())
                 .addSuggestionProviderAction("@") { query ->
                     if (query.isNotEmpty()) {
                         presenter.spotlight(query, PEOPLE, true)
@@ -505,6 +518,11 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
                         presenter.loadChatRooms()
                     }
                 }
+                .addSuggestionProviderAction("/") { _ ->
+                    presenter.loadCommands()
+                }
+
+        presenter.loadCommands()
     }
 
     private fun openEmojiKeyboardPopup() {

app/src/main/java/chat/rocket/android/chatroom/viewmodel/ChatRoomViewModel.kt

-package chat.rocket.android.chatroom.viewmodel
-
-import chat.rocket.android.widget.autocompletion.model.SuggestionModel
-
-class ChatRoomViewModel(text: String,
-                        val fullName: String,
-                        val name: String,
-                        searchList: List<String>) : SuggestionModel(text, searchList, false) {
-}
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/viewmodel/PeopleViewModel.kt

-package chat.rocket.android.chatroom.viewmodel
-
-import chat.rocket.android.widget.autocompletion.model.SuggestionModel
-import chat.rocket.common.model.UserStatus
-
-class PeopleViewModel(val imageUri: String,
-                      text: String,
-                      val username: String,
-                      val name: String,
-                      val status: UserStatus?,
-                      pinned: Boolean = false,
-                      searchList: List<String>) : SuggestionModel(text, searchList, pinned) {
-
-    override fun toString(): String {
-        return "PeopleViewModel(imageUri='$imageUri', username='$username', name='$name', status=$status, pinned=$pinned)"
-    }
-}
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/viewmodel/suggestion/ChatRoomSuggestionViewModel.kt

+package chat.rocket.android.chatroom.viewmodel.suggestion
+
+import chat.rocket.android.widget.autocompletion.model.SuggestionModel
+
+class ChatRoomSuggestionViewModel(text: String,
+                                  val fullName: String,
+                                  val name: String,
+                                  searchList: List<String>) : SuggestionModel(text, searchList, false) {
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/viewmodel/suggestion/CommandSuggestionViewModel.kt

+package chat.rocket.android.chatroom.viewmodel.suggestion
+
+import chat.rocket.android.widget.autocompletion.model.SuggestionModel
+
+class CommandSuggestionViewModel(text: String,
+                                 val description: String,
+                                 searchList: List<String>) : SuggestionModel(text, searchList)
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/viewmodel/suggestion/PeopleSuggestionViewModel.kt

+package chat.rocket.android.chatroom.viewmodel.suggestion
+
+import chat.rocket.android.widget.autocompletion.model.SuggestionModel
+import chat.rocket.common.model.UserStatus
+
+class PeopleSuggestionViewModel(val imageUri: String,
+                                text: String,
+                                val username: String,
+                                val name: String,
+                                val status: UserStatus?,
+                                pinned: Boolean = false,
+                                searchList: List<String>) : SuggestionModel(text, searchList, pinned) {
+
+    override fun toString(): String {
+        return "PeopleSuggestionViewModel(imageUri='$imageUri', username='$username', name='$name', status=$status, pinned=$pinned)"
+    }
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/members/ui/MembersFragment.kt

@@ -15,7 +15,6 @@ import chat.rocket.android.members.adapter.MembersAdapter
 import chat.rocket.android.members.presentation.MembersPresenter
 import chat.rocket.android.members.presentation.MembersView
 import chat.rocket.android.members.viewmodel.MemberViewModel
-import chat.rocket.android.util.extensions.hideKeyboard
 import chat.rocket.android.util.extensions.inflate
 import chat.rocket.android.util.extensions.setVisible
 import chat.rocket.android.util.extensions.showToast
@@ -23,9 +22,6 @@ import chat.rocket.android.widget.DividerItemDecoration
 import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_members.*
 import javax.inject.Inject
-import android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY
-import android.app.Activity
-import android.view.inputmethod.InputMethodManager
 
 
 fun newInstance(chatRoomId: String, chatRoomType: String): Fragment {
@@ -65,8 +61,6 @@ class MembersFragment : Fragment(), MembersView {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        val imm = activity?.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
-        imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0)
 
         (activity as AppCompatActivity).supportActionBar?.title = ""
 

app/src/main/java/chat/rocket/android/util/extensions/Ui.kt

@@ -46,8 +46,10 @@ fun AppCompatActivity.addFragmentBackStack(tag: String, layoutId: Int, newInstan
 }
 
 fun Activity.hideKeyboard() {
+    if (currentFocus != null) {
         val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
         imm.hideSoftInputFromWindow(currentFocus.windowToken, InputMethodManager.RESULT_UNCHANGED_SHOWN)
+    }
 }
 
 fun Activity.showToast(@StringRes resource: Int, duration: Int = Toast.LENGTH_SHORT) = showToast(getString(resource), duration)

app/src/main/java/chat/rocket/android/widget/autocompletion/strategy/regex/StringMatchingCompletionStrategy.kt

@@ -2,24 +2,25 @@ package chat.rocket.android.widget.autocompletion.strategy.regex
 
 import chat.rocket.android.widget.autocompletion.model.SuggestionModel
 import chat.rocket.android.widget.autocompletion.strategy.CompletionStrategy
+import chat.rocket.android.widget.autocompletion.ui.SuggestionsAdapter
 import java.util.concurrent.CopyOnWriteArrayList
 
-internal class StringMatchingCompletionStrategy : CompletionStrategy {
+internal class StringMatchingCompletionStrategy(private val threshold: Int = -1) : CompletionStrategy {
     private val list = CopyOnWriteArrayList<SuggestionModel>()
 
     override fun autocompleteItems(prefix: String): List<SuggestionModel> {
-        return list.filter {
+        val result = list.filter {
             it.searchList.forEach { word ->
                 if (word.contains(prefix, ignoreCase = true)) {
                     return@filter true
                 }
             }
             false
-        }.sortedByDescending { it.pinned }.take(5)
+        }.sortedByDescending { it.pinned }
+        return if (threshold == SuggestionsAdapter.UNLIMITED_RESULT_COUNT) result else result.take(threshold)
     }
 
     override fun addAll(list: List<SuggestionModel>) {
-//        this.list.removeAll { !it.pinned }
         this.list.addAllAbsent(list)
     }
 

app/src/main/java/chat/rocket/android/widget/autocompletion/ui/SuggestionsAdapter.kt

@@ -7,14 +7,32 @@ import chat.rocket.android.widget.autocompletion.strategy.regex.StringMatchingCo
 import java.lang.reflect.Type
 import kotlin.properties.Delegates
 
-abstract class SuggestionsAdapter<VH : BaseSuggestionViewHolder>(val token: String) : RecyclerView.Adapter<VH>() {
-    private val strategy: CompletionStrategy = StringMatchingCompletionStrategy()
+abstract class SuggestionsAdapter<VH : BaseSuggestionViewHolder>(
+        val token: String,
+        val constraint: Int = CONSTRAINT_UNBOUND,
+        threshold: Int  = MAX_RESULT_COUNT) : RecyclerView.Adapter<VH>() {
+    companion object {
+        // Any number of results.
+        const val UNLIMITED_RESULT_COUNT = -1
+        // Trigger suggestions only if on the line start.
+        const val CONSTRAINT_BOUND_TO_START = 0
+        // Trigger suggestions from anywhere.
+        const val CONSTRAINT_UNBOUND = 1
+        // Maximum number of results to display by default.
+        private const val MAX_RESULT_COUNT = 5
+    }
     private var itemType: Type? = null
     private var itemClickListener: ItemClickListener? = null
+    // Called to gather results when no results have previously matched.
     private var providerExternal: ((query: String) -> Unit)? = null
-    private var prefix: String by Delegates.observable("", { _, _, _ ->
-        strategy.autocompleteItems(prefix)
-        notifyItemRangeChanged(0, 5)
+    // Maximum number of results/suggestions to display.
+    private var resultsThreshold: Int = if (threshold > 0) threshold else UNLIMITED_RESULT_COUNT
+    // The strategy used for suggesting completions.
+    private val strategy: CompletionStrategy = StringMatchingCompletionStrategy(resultsThreshold)
+    // Current input term to look up for suggestions.
+    private var currentTerm: String by Delegates.observable("", { _, _, newTerm ->
+        val items = strategy.autocompleteItems(newTerm)
+        notifyDataSetChanged()
     })
 
     init {
@@ -29,21 +47,21 @@ abstract class SuggestionsAdapter<VH : BaseSuggestionViewHolder>(val token: Stri
         holder.bind(getItem(position), itemClickListener)
     }
 
-    override fun getItemCount() = strategy.autocompleteItems(prefix).size
+    override fun getItemCount() = strategy.autocompleteItems(currentTerm).size
 
     private fun getItem(position: Int): SuggestionModel {
-        return strategy.autocompleteItems(prefix)[position]
+        return strategy.autocompleteItems(currentTerm)[position]
     }
 
-    fun autocomplete(prefix: String) {
-        this.prefix = prefix.toLowerCase().trim()
+    fun autocomplete(newTerm: String) {
+        this.currentTerm = newTerm.toLowerCase().trim()
     }
 
     fun addItems(list: List<SuggestionModel>) {
         strategy.addAll(list)
         // Since we've just added new items we should check for possible new completion suggestions.
-        strategy.autocompleteItems(prefix)
-        notifyItemRangeChanged(0, 5)
+        strategy.autocompleteItems(currentTerm)
+        notifyDataSetChanged()
     }
 
     fun setOnClickListener(clickListener: ItemClickListener) {
@@ -52,11 +70,24 @@ abstract class SuggestionsAdapter<VH : BaseSuggestionViewHolder>(val token: Stri
 
     fun hasItemClickListener() = itemClickListener != null
 
-    fun prefix() = prefix
+    /**
+     * Return the current searched term.
+     */
+    fun term() = this.currentTerm
+
+    /**
+     * Set the maximum number of results to show.
+     *
+     * @param threshold The maximum number of suggestions to display.
+     */
+    fun setResultsThreshold(threshold: Int) {
+        check(threshold > 0)
+        resultsThreshold = threshold
+    }
 
     fun cancel() {
         strategy.addAll(emptyList())
-        strategy.autocompleteItems(prefix)
+        strategy.autocompleteItems(currentTerm)
         notifyDataSetChanged()
     }
 

app/src/main/java/chat/rocket/android/widget/autocompletion/ui/SuggestionsView.kt

@@ -21,7 +21,9 @@ import android.widget.EditText
 import android.widget.FrameLayout
 import chat.rocket.android.R
 import chat.rocket.android.widget.autocompletion.model.SuggestionModel
+import chat.rocket.android.widget.autocompletion.ui.SuggestionsAdapter.Companion.CONSTRAINT_BOUND_TO_START
 import java.lang.ref.WeakReference
+import java.util.concurrent.CopyOnWriteArrayList
 import java.util.concurrent.atomic.AtomicInteger
 
 /**
@@ -31,12 +33,14 @@ private const val NO_STATE_INDEX = 0
 
 class SuggestionsView : FrameLayout, TextWatcher {
     private val recyclerView: RecyclerView
+    private val registeredTokens = CopyOnWriteArrayList<String>()
     // Maps tokens to their respective adapters.
     private val adaptersByToken = hashMapOf<String, SuggestionsAdapter<out BaseSuggestionViewHolder>>()
     private val externalProvidersByToken = hashMapOf<String, ((query: String) -> Unit)>()
     private val localProvidersByToken = hashMapOf<String, HashMap<String, List<SuggestionModel>>>()
     private var editor: WeakReference<EditText>? = null
     private var completionStartIndex = AtomicInteger(NO_STATE_INDEX)
+    private var maxHeight: Int = 0
 
     companion object {
         private val SLIDE_TRANSITION = Slide(Gravity.BOTTOM).setDuration(200)
@@ -75,6 +79,10 @@ class SuggestionsView : FrameLayout, TextWatcher {
 
         val new = s.subSequence(start, start + count).toString()
         if (adaptersByToken.containsKey(new)) {
+            val constraint = adapter(new).constraint
+            if (constraint == CONSTRAINT_BOUND_TO_START && start != 0) {
+                return
+            }
             swapAdapter(getAdapterForToken(new)!!)
             completionStartIndex.compareAndSet(NO_STATE_INDEX, start + 1)
             editor?.let {
@@ -110,9 +118,18 @@ class SuggestionsView : FrameLayout, TextWatcher {
         }
     }
 
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        if (maxHeight > 0) {
+            val hSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST)
+            super.onMeasure(widthMeasureSpec, hSpec)
+        } else {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        }
+    }
+
     private fun swapAdapter(adapter: SuggestionsAdapter<*>): SuggestionsView {
         recyclerView.adapter = adapter
-        // Don't override if user set an item click listener already/
+        // Don't override if user has set an item click listener already
         if (!adapter.hasItemClickListener()) {
             setOnItemClickListener(adapter) {
                 // set default item click behavior
@@ -121,16 +138,16 @@ class SuggestionsView : FrameLayout, TextWatcher {
         return this
     }
 
-    fun getAdapterForToken(token: String): SuggestionsAdapter<*>? = adaptersByToken.get(token)
+    private fun getAdapterForToken(token: String): SuggestionsAdapter<*>? = adaptersByToken.get(token)
 
-    fun anchor(editText: EditText): SuggestionsView {
+    fun anchorTo(editText: EditText): SuggestionsView {
         editText.removeTextChangedListener(this)
         editText.addTextChangedListener(this)
         editor = WeakReference(editText)
         return this
     }
 
-    fun bindTokenAdapter(adapter: SuggestionsAdapter<*>): SuggestionsView {
+    fun addTokenAdapter(adapter: SuggestionsAdapter<*>): SuggestionsView {
         adaptersByToken.getOrPut(adapter.token, { adapter })
         return this
     }
@@ -139,13 +156,20 @@ class SuggestionsView : FrameLayout, TextWatcher {
         if (list.isNotEmpty()) {
             val adapter = adapter(token)
             localProvidersByToken.getOrPut(token, { hashMapOf() })
-                    .put(adapter.prefix(), list)
+                    .put(adapter.term(), list)
             if (completionStartIndex.get() > NO_STATE_INDEX && adapter.itemCount == 0) expand()
             adapter.addItems(list)
         }
         return this
     }
 
+    fun setMaximumHeight(height: Int): SuggestionsView {
+        check(height > 0)
+        this.maxHeight = height
+        requestLayout()
+        return this
+    }
+
     fun setOnItemClickListener(tokenAdapter: SuggestionsAdapter<*>,
                                clickListener: (item: SuggestionModel) -> Unit): SuggestionsView {
         tokenAdapter.setOnClickListener(object : SuggestionsAdapter.ItemClickListener {
@@ -160,6 +184,9 @@ class SuggestionsView : FrameLayout, TextWatcher {
     }
 
     fun addSuggestionProviderAction(token: String, provider: (query: String) -> Unit): SuggestionsView {
+        if (adaptersByToken[token] == null) {
+            throw IllegalStateException("token \"$token\" suggestion provider added without adapter")
+        }
         externalProvidersByToken.getOrPut(token, { provider })
         return this
     }

app/src/main/res/layout/suggestion_command_item.xml

+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginBottom="4dp"
+    android:layout_marginTop="4dp"
+    android:background="@color/suggestion_background_color"
+    android:orientation="horizontal"
+    android:paddingTop="2dp">
+
+    <TextView
+        android:id="@+id/text_command_name"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:layout_marginStart="8dp"
+        android:ellipsize="end"
+        android:maxLines="1"
+        android:textColor="@color/black"
+        android:textSize="14sp"
+        tools:text="/leave" />
+
+    <TextView
+        android:id="@+id/text_command_description"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="16dp"
+        android:layout_toRightOf="@id/text_command_name"
+        android:ellipsize="end"
+        android:gravity="start"
+        android:maxLines="1"
+        android:textColor="@color/gray_material"
+        android:textSize="14sp"
+        tools:text="Leave a channel" />
+
+</RelativeLayout>
\ No newline at end of file

app/src/main/res/values/dimens.xml

@@ -34,5 +34,6 @@
 
     <!-- Autocomplete Popup -->
     <dimen name="popup_max_height">150dp</dimen>
+    <dimen name="suggestions_box_max_height">250dp</dimen>
 
 </resources>
\ No newline at end of file