Implement general-purpose tooltip "(?)"-style

src/components/views/rooms/RoomTooltip.js

@@ -19,13 +19,16 @@ limitations under the License.
 var React = require('react');
 var ReactDOM = require('react-dom');
 var dis = require('matrix-react-sdk/lib/dispatcher');
+import classNames from 'classnames';
 
 module.exports = React.createClass({
     displayName: 'RoomTooltip',
 
     propTypes: {
-        // Alllow the tooltip to be styled by the parent element
+        // Class applied to the element used to position the tooltip
         className: React.PropTypes.string.isRequired,
+        // Class applied to the tooltip itself
+        tooltipClassName: React.PropTypes.string,
         // The tooltip is derived from either the room name or a label
         room: React.PropTypes.object,
         label: React.PropTypes.string,
@@ -69,8 +72,12 @@ module.exports = React.createClass({
         style.left = 6 + parent.getBoundingClientRect().right + window.pageXOffset;
         style.display = "block";
 
+        const tooltipClasses = classNames(
+            "mx_RoomTooltip", this.props.tooltipClassName,
+        );
+
         var tooltip = (
-            <div className="mx_RoomTooltip" style={style} >
+            <div className={tooltipClasses} style={style} >
                 <div className="mx_RoomTooltip_chevron"></div>
                 { label }
             </div>

src/skins/vector/css/_components.scss

@@ -35,6 +35,7 @@
 @import "./matrix-react-sdk/views/elements/_ProgressBar.scss";
 @import "./matrix-react-sdk/views/elements/_RichText.scss";
 @import "./matrix-react-sdk/views/elements/_RoleButton.scss";
+@import "./matrix-react-sdk/views/elements/_ToolTip.scss";
 @import "./matrix-react-sdk/views/groups/_GroupRoomList.scss";
 @import "./matrix-react-sdk/views/login/_InteractiveAuthEntryComponents.scss";
 @import "./matrix-react-sdk/views/login/_ServerConfig.scss";

src/skins/vector/css/matrix-react-sdk/views/elements/_ToolTip.scss

@@ -0,0 +1,51 @@
+/*
+Copyright 2017 New Vector 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.
+*/
+
+.mx_ToolTip {
+    display: inline-block;
+    width: 11px;
+    height: 11px;
+    margin-left: 5px;
+
+    border: 2px solid $neutral-badge-color;
+    border-radius: 20px;
+    color: $neutral-badge-color;
+
+    transition: opacity 0.2s ease-in;
+    opacity: 0.6;
+
+    line-height: 11px;
+    text-align: center;
+
+    cursor: pointer;
+}
+
+.mx_ToolTip:hover {
+    opacity: 1.0;
+}
+
+.mx_ToolTip_container {
+    position: relative;
+    top: -18px;
+    left: 4px;
+}
+
+.mx_ToolTip_helpText {
+    width: 200px;
+    text-align: center;
+    line-height: 17px !important;
+}
+