Add full emoji picker for reactions

Signed-off-by: Tulir Asokan <tulir@maunium.net>

src/components/views/emojipicker/QuickReactions.js

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+/*
+Copyright 2019 Tulir Asokan
+
+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.
+*/
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import EMOJIBASE from 'emojibase-data/en/compact.json';
+
+import sdk from '../../../index';
+import { _t } from '../../../languageHandler';
+
+const QUICK_REACTIONS = ["👍️", "👎️", "😄", "🎉", "😕", "❤️", "🚀", "👀"];
+EMOJIBASE.forEach(emoji => {
+    const index = QUICK_REACTIONS.indexOf(emoji.unicode);
+    if (index !== -1) {
+        QUICK_REACTIONS[index] = emoji;
+    }
+});
+
+class QuickReactions extends React.Component {
+    static propTypes = {
+        onClick: PropTypes.func.isRequired,
+    };
+
+    constructor(props) {
+        super(props);
+        this.state = {
+            hover: null,
+        };
+        this.onMouseEnter = this.onMouseEnter.bind(this);
+        this.onMouseLeave = this.onMouseLeave.bind(this);
+    }
+
+    onMouseEnter(emoji) {
+        this.setState({
+            hover: emoji,
+        });
+    }
+
+    onMouseLeave() {
+        this.setState({
+            hover: null,
+        });
+    }
+
+    render() {
+        const Emoji = sdk.getComponent("emojipicker.Emoji");
+
+        return (
+            <section className="mx_EmojiPicker_footer mx_EmojiPicker_quick mx_EmojiPicker_category">
+                <h2 className="mx_EmojiPicker_quick_header mx_EmojiPicker_category_label">
+                    {!this.state.hover
+                        ? _t("Quick Reactions")
+                        : <React.Fragment>
+                            <span className="mx_EmojiPicker_name">{this.state.hover.annotation}</span>
+                            <span className="mx_EmojiPicker_shortcode">{this.state.hover.shortcodes[0]}</span>
+                        </React.Fragment>
+                    }
+                </h2>
+                <ul className="mx_EmojiPicker_list">
+                    {QUICK_REACTIONS.map(emoji => <Emoji
+                        key={emoji.hexcode} emoji={emoji} onClick={this.props.onClick}
+                        onMouseEnter={this.onMouseEnter} onMouseLeave={this.onMouseLeave}/>)}
+                </ul>
+            </section>
+        )
+    }
+}
+
+export default QuickReactions;