From e1f3c80f1928eff8fb1085ce26e7cd6e355cffdb Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Sun, 19 Jul 2015 16:38:56 +0100
Subject: [PATCH] Display who's typing

---
 skins/base/views/organisms/RoomView.js | 15 ++++++++
 src/WhoIsTyping.js                     | 49 ++++++++++++++++++++++++++
 src/controllers/organisms/RoomView.js  | 11 ++++++
 3 files changed, 75 insertions(+)
 create mode 100644 src/WhoIsTyping.js

diff --git a/skins/base/views/organisms/RoomView.js b/skins/base/views/organisms/RoomView.js
index 88adfdaa..5878e881 100644
--- a/skins/base/views/organisms/RoomView.js
+++ b/skins/base/views/organisms/RoomView.js
@@ -71,6 +71,20 @@ module.exports = React.createClass({
                 mx_RoomView_scrollheader: true,
                 loading: this.state.paginating
             });
+
+            var statusBar = (
+                <div />
+            );
+
+            var typingString = this.getWhoIsTypingString();
+            if (typingString) {
+                statusBar = (
+                    <div className="mx_RoomView_typingBar">
+                        {typingString}
+                    </div>
+                );
+            }
+
             return (
                 <div className="mx_RoomView">
                     <RoomHeader room={this.state.room} />
@@ -88,6 +102,7 @@ module.exports = React.createClass({
                     </div>
                     <div className="mx_RoomView_statusArea">
                         <div className="mx_RoomView_statusAreaBox">
+                            {statusBar}
                         </div>
                     </div>
                     <MessageComposer room={this.state.room} />
diff --git a/src/WhoIsTyping.js b/src/WhoIsTyping.js
new file mode 100644
index 00000000..4fb53990
--- /dev/null
+++ b/src/WhoIsTyping.js
@@ -0,0 +1,49 @@
+var MatrixClientPeg = require("./MatrixClientPeg");
+
+module.exports = {
+    usersTypingApartFromMe: function(room) {
+        return this.usersTyping(
+            room, [MatrixClientPeg.get().credentials.userId]
+        );
+    },
+
+    /**
+     * Given a Room object and, optionally, a list of userID strings
+     * to exclude, return a list of user objects who are typing.
+     */
+    usersTyping: function(room, exclude) {
+        var whoIsTyping = [];
+
+        if (exclude === undefined) {
+            exclude = [];
+        }
+
+        var memberKeys = Object.keys(room.currentState.members);
+        for (var i = 0; i < memberKeys.length; ++i) {
+            var userId = memberKeys[i];
+
+            if (room.currentState.members[userId].typing) {
+                if (exclude.indexOf(userId) == -1) {
+                    whoIsTyping.push(room.currentState.members[userId]);
+                }
+            }
+        }
+
+        return whoIsTyping;
+    },
+
+    whoIsTypingString: function(room) {
+        var whoIsTyping = this.usersTypingApartFromMe(room);
+        if (whoIsTyping.length == 0) {
+            return null;
+        } else if (whoIsTyping.length == 1) {
+            return whoIsTyping[0].name + ' is typing';
+        } else {
+            var names = whoIsTyping.map(function(m) {
+                return m.name;
+            });
+            var lastPerson = names.shift();
+            return names.join(', ') + ' and ' + lastPerson + ' are typing';
+        }
+    }
+}
diff --git a/src/controllers/organisms/RoomView.js b/src/controllers/organisms/RoomView.js
index f73b5c8f..59807b63 100644
--- a/src/controllers/organisms/RoomView.js
+++ b/src/controllers/organisms/RoomView.js
@@ -20,6 +20,7 @@ var MatrixClientPeg = require("../../MatrixClientPeg");
 var React = require("react");
 var q = require("q");
 var ContentMessages = require("../../ContentMessages");
+var WhoIsTyping = require("../../WhoIsTyping");
 
 var dis = require("../../dispatcher");
 
@@ -51,6 +52,7 @@ module.exports = {
         this.dispatcherRef = dis.register(this.onAction);
         MatrixClientPeg.get().on("Room.timeline", this.onRoomTimeline);
         MatrixClientPeg.get().on("Room.name", this.onRoomName);
+        MatrixClientPeg.get().on("RoomMember.typing", this.onRoomMemberTyping);
         this.atBottom = true;
     },
 
@@ -64,6 +66,7 @@ module.exports = {
         if (MatrixClientPeg.get()) {
             MatrixClientPeg.get().removeListener("Room.timeline", this.onRoomTimeline);
             MatrixClientPeg.get().removeListener("Room.name", this.onRoomName);
+            MatrixClientPeg.get().removeListener("RoomMember.typing", this.onRoomMemberTyping);
         }
     },
 
@@ -118,6 +121,10 @@ module.exports = {
         }
     },
 
+    onRoomMemberTyping: function(ev, member) {
+        this.forceUpdate();
+    },
+
     componentDidMount: function() {
         if (this.refs.messageWrapper) {
             var messageWrapper = this.refs.messageWrapper.getDOMNode();
@@ -236,6 +243,10 @@ module.exports = {
         }
     },
 
+    getWhoIsTypingString() {
+        return WhoIsTyping.whoIsTypingString(this.state.room);
+    },
+
     getEventTiles: function() {
         var ret = [];
         var count = 0;