Add a TruncatedList component, which truncates children passed to it.

src/component-index.js

@@ -23,6 +23,7 @@ limitations under the License.
 
 module.exports.components = {};
 module.exports.components['structures.CreateRoom'] = require('./components/structures/CreateRoom');
+module.exports.components['structures.login.ForgotPassword'] = require('./components/structures/login/ForgotPassword');
 module.exports.components['structures.login.Login'] = require('./components/structures/login/Login');
 module.exports.components['structures.login.PostRegistration'] = require('./components/structures/login/PostRegistration');
 module.exports.components['structures.login.Registration'] = require('./components/structures/login/Registration');
@@ -31,10 +32,6 @@ module.exports.components['structures.RoomView'] = require('./components/structu
 module.exports.components['structures.ScrollPanel'] = require('./components/structures/ScrollPanel');
 module.exports.components['structures.UploadBar'] = require('./components/structures/UploadBar');
 module.exports.components['structures.UserSettings'] = require('./components/structures/UserSettings');
-module.exports.components['structures.login.ForgotPassword'] = require('./components/structures/login/ForgotPassword');
-module.exports.components['structures.login.Login'] = require('./components/structures/login/Login');
-module.exports.components['structures.login.PostRegistration'] = require('./components/structures/login/PostRegistration');
-module.exports.components['structures.login.Registration'] = require('./components/structures/login/Registration');
 module.exports.components['views.avatars.BaseAvatar'] = require('./components/views/avatars/BaseAvatar');
 module.exports.components['views.avatars.MemberAvatar'] = require('./components/views/avatars/MemberAvatar');
 module.exports.components['views.avatars.RoomAvatar'] = require('./components/views/avatars/RoomAvatar');
@@ -49,6 +46,7 @@ module.exports.components['views.elements.EditableText'] = require('./components
 module.exports.components['views.elements.PowerSelector'] = require('./components/views/elements/PowerSelector');
 module.exports.components['views.elements.ProgressBar'] = require('./components/views/elements/ProgressBar');
 module.exports.components['views.elements.TintableSvg'] = require('./components/views/elements/TintableSvg');
+module.exports.components['views.elements.TruncatedList'] = require('./components/views/elements/TruncatedList');
 module.exports.components['views.elements.UserSelector'] = require('./components/views/elements/UserSelector');
 module.exports.components['views.login.CaptchaForm'] = require('./components/views/login/CaptchaForm');
 module.exports.components['views.login.CasLogin'] = require('./components/views/login/CasLogin');

src/components/views/elements/TruncatedList.js

@@ -0,0 +1,61 @@
+/*
+Copyright 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+var React = require('react');
+
+module.exports = React.createClass({
+    displayName: 'TruncatedList',
+
+    propTypes: {
+        truncateAt: React.PropTypes.number,
+        className: React.PropTypes.string,
+        createOverflowElement: React.PropTypes.func
+    },
+
+    getDefaultProps: function() {
+        return {
+            truncateAt: 2,
+            createOverflowElement: function(overflowCount, totalCount) {
+                return (
+                    <div>And {overflowCount} more...</div>
+                );
+            }
+        };
+    },
+
+    render: function() {
+        var childsJsx = this.props.children;
+        var overflowJsx;
+        var childCount = React.Children.count(this.props.children);
+        var overflowCount = childCount - this.props.truncateAt;
+
+        if (overflowCount > 0) {
+            overflowJsx = this.props.createOverflowElement(
+                overflowCount, childCount
+            );
+            var childArray = React.Children.toArray(this.props.children);
+            // cut out the overflow elements
+            childArray.splice(childCount - overflowCount, overflowCount);
+            childsJsx = childArray; // use what is left
+        }
+
+        return (
+            <div className={this.props.className}>
+                {childsJsx}
+                {overflowJsx}
+            </div>
+        );
+    }
+});

src/components/views/rooms/MemberList.js

@@ -368,13 +368,14 @@ module.exports = React.createClass({
                 </div>
             );
         }
+        var TruncatedList = sdk.getComponent("elements.TruncatedList");
         return (
             <div className="mx_MemberList">
                     {this.inviteTile()}
                     <GeminiScrollbar autoshow={true} className="mx_MemberList_joined mx_MemberList_outerWrapper">
-                        <div className="mx_MemberList_wrapper">
+                        <TruncatedList className="mx_MemberList_wrapper">
                             {this.makeMemberTiles('join', this.state.searchQuery)}
-                        </div>
+                        </TruncatedList>
                         {invitedSection}
                     </GeminiScrollbar>
                     <div className="mx_MemberList_bottom">