Add wysisyg composer (can only send message, enable behind a labs flag)

src/components/views/rooms/wysiwyg_composer/WysiwygComposer.tsx

@@ -0,0 +1,58 @@
+/*
+Copyright 2022 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, { useCallback, useState } from 'react';
+import { useWysiwyg } from "matrix-wysiwyg";
+import { IEventRelation, MatrixEvent } from 'matrix-js-sdk/src/models/event';
+
+import { useRoomContext } from '../../../../contexts/RoomContext';
+import { sendMessage } from './message';
+import { RoomPermalinkCreator } from '../../../../utils/permalinks/Permalinks';
+import { useMatrixClientContext } from '../../../../contexts/MatrixClientContext';
+
+interface WysiwygProps {
+    disabled?: boolean;
+    onChange: (content: string) => void;
+    relation: IEventRelation;
+    replyToEvent?: MatrixEvent;
+    permalinkCreator: RoomPermalinkCreator;
+    includeReplyLegacyFallback?: boolean;
+    children?: (sendMessage: () => void) => void;
+}
+
+export function WysiwygComposer(
+    { disabled = false, onChange, children, ...props }: WysiwygProps, forwardRef,
+) {
+    const roomContext = useRoomContext();
+    const mxClient = useMatrixClientContext();
+
+    const [content, setContent] = useState<string>();
+    const { ref, isWysiwygReady } = useWysiwyg({ onChange: (_content) => {
+        setContent(_content);
+        onChange(_content);
+    } });
+
+    const memoizedSendMessage = useCallback(() => sendMessage(content, mxClient, { roomContext, ...props }),
+        [content, mxClient, roomContext, props],
+    );
+
+    return (
+        <div className="mx_SendMessageComposer" style={{ minHeight: '30px' }} ref={ref} contentEditable={!disabled && isWysiwygReady} suppressContentEditableWarning={true}>
+            <br />
+            { children?.(memoizedSendMessage) }
+        </div>
+    );
+}