Convert emojipicker to typescript

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/emojipicker/Search.tsx

@@ -0,0 +1,65 @@
+/*
+Copyright 2019 Tulir Asokan <tulir@maunium.net>
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+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 { _t } from '../../../languageHandler';
+
+interface IProps {
+    query: string;
+    onChange(value: string): void;
+}
+
+class Search extends React.PureComponent<IProps> {
+    private inputRef = React.createRef<HTMLInputElement>();
+
+    componentDidMount() {
+        // For some reason, neither the autoFocus nor just calling focus() here worked, so here's a setTimeout
+        setTimeout(() => this.inputRef.current.focus(), 0);
+    }
+
+    render() {
+        let rightButton;
+        if (this.props.query) {
+            rightButton = (
+                <button
+                    onClick={() => this.props.onChange("")}
+                    className="mx_EmojiPicker_search_icon mx_EmojiPicker_search_clear"
+                    title={_t("Cancel search")}
+                />
+            );
+        } else {
+            rightButton = <span className="mx_EmojiPicker_search_icon" />;
+        }
+
+        return (
+            <div className="mx_EmojiPicker_search">
+                <input
+                    autoFocus
+                    type="text"
+                    placeholder="Search"
+                    value={this.props.query}
+                    onChange={ev => this.props.onChange(ev.target.value)}
+                    ref={this.inputRef}
+                />
+                {rightButton}
+            </div>
+        );
+    }
+}
+
+export default Search;