Feat: multiline text input for chat (#5317)

### What problem does this PR solve?

Improves the chat interface by adding a multiline chat area that grows
when multiple lines exists.

Some images:

* Empty:
<img width="1334" alt="image"
src="https://github.com/user-attachments/assets/e8a68b46-def9-45af-b5b1-db0f0b67e6d8"
/>

* With multiple lines and documents:
<img width="1070" alt="image"
src="https://github.com/user-attachments/assets/ff976c5c-08fa-492f-9fc0-17512c95f9f2"
/>


### Type of change
- [X] New Feature (non-breaking change which adds functionality)

web/src/components/message-input/index.less

@@ -1,29 +1,38 @@
 .messageInputWrapper {
   margin-right: 20px;
-  background-color: rgba(255, 255, 255, 0.1);
+  padding: '0px 0px 10px 0px';
+  background-color: #ffffff;
+  border: 1px solid #d9d9d9;
+  &:hover {
+    border-color: #40a9ff;
+    box-shadow: #40a9ff;
+  }
   border-radius: 8px;
   :global(.ant-input-affix-wrapper) {
     border-bottom-right-radius: 0;
     border-bottom-left-radius: 0;
   }
-  .documentCard {
+}
+
+.documentCard {
   :global(.ant-card-body) {
     padding: 10px;
     position: relative;
+    width: 100%;
   }
-  }
-  .listWrapper {
+}
+.listWrapper {
   padding: 0 10px;
   overflow: auto;
   max-height: 170px;
-  }
-  .inputWrapper {
+  width: 100%;
+}
+.inputWrapper {
   border-radius: 8px;
-  }
-  .deleteIcon {
+}
+.deleteIcon {
   position: absolute;
   right: -4px;
   top: -4px;
   color: #d92d20;
-  }
 }

web/src/components/message-input/index.tsx

@@ -11,11 +11,14 @@ import {
   CloseCircleOutlined,
   InfoCircleOutlined,
   LoadingOutlined,
+  PaperClipOutlined,
+  SendOutlined,
 } from '@ant-design/icons';
 import type { GetProp, UploadFile } from 'antd';
 import {
   Button,
   Card,
+  Divider,
   Flex,
   Input,
   List,
@@ -25,12 +28,9 @@ import {
   Upload,
   UploadProps,
 } from 'antd';
-import classNames from 'classnames';
 import get from 'lodash/get';
-import { Paperclip } from 'lucide-react';
 import {
   ChangeEventHandler,
-  KeyboardEventHandler,
   memo,
   useCallback,
   useEffect,
@@ -43,6 +43,8 @@ import styles from './index.less';
 type FileType = Parameters<GetProp<UploadProps, 'beforeUpload'>>[0];
 const { Text } = Typography;
 
+const { TextArea } = Input;
+
 const getFileId = (file: UploadFile) => get(file, 'response.data.0');
 
 const getFileIds = (fileList: UploadFile[]) => {
@@ -99,6 +101,7 @@ const MessageInput = ({
   const { data: documentInfos, setDocumentIds } = useFetchDocumentInfosByIds();
   const { uploadAndParseDocument } = useUploadAndParseDocument(uploadMethod);
   const conversationIdRef = useRef(conversationId);
+
   const [fileList, setFileList] = useState<UploadFile[]>([]);
 
   const handlePreview = async (file: UploadFile) => {
@@ -128,7 +131,6 @@ const MessageInput = ({
       });
       return [...list];
     });
-
     const ret = await uploadAndParseDocument({
       conversationId: nextConversationId,
       fileList: [file],
@@ -148,6 +150,19 @@ const MessageInput = ({
 
   const isUploadingFile = fileList.some((x) => x.status === 'uploading');
 
+  const handleKeyDown = useCallback(
+    async (event: React.KeyboardEvent<HTMLTextAreaElement>) => {
+      // check if it was shift + enter
+      if (event.key === 'Enter' && event.shiftKey) return;
+      if (event.key !== 'Enter') return;
+      if (sendDisabled || isUploadingFile || sendLoading) return;
+
+      event.preventDefault();
+      handlePressEnter();
+    },
+    [fileList, onPressEnter, isUploadingFile],
+  );
+
   const handlePressEnter = useCallback(async () => {
     if (isUploadingFile) return;
     const ids = getFileIds(fileList.filter((x) => isUploadSuccess(x)));
@@ -161,14 +176,6 @@ const MessageInput = ({
   const handleCompositionStart = () => setIsComposing(true);
   const handleCompositionEnd = () => setIsComposing(false);
 
-  const handleInputKeyDown: KeyboardEventHandler<HTMLTextAreaElement> = (e) => {
-    if (e.key === 'Enter' && !e.nativeEvent.shiftKey) {
-      if (isComposing || sendLoading) return;
-      e.preventDefault();
-      handlePressEnter();
-    }
-  };
-
   const handleRemove = useCallback(
     async (file: UploadFile) => {
       const ids = get(file, 'response.data', []);
@@ -215,52 +222,27 @@ const MessageInput = ({
   }, [conversationId, setFileList]);
 
   return (
-    <Flex gap={20} vertical className={styles.messageInputWrapper}>
-      <Flex align="center" gap={8}>
-        <Input.TextArea
+    <Flex gap={1} vertical className={styles.messageInputWrapper}>
+      <TextArea
         size="large"
         placeholder={t('sendPlaceholder')}
         value={value}
+        allowClear
         disabled={disabled}
-          className={classNames({
-            [styles.inputWrapper]: fileList.length === 0,
-          })}
-          onKeyDown={handleInputKeyDown}
+        style={{
+          border: 'none',
+          boxShadow: 'none',
+          padding: '0px 10px',
+          marginTop: 10,
+        }}
+        autoSize={{ minRows: 2, maxRows: 10 }}
+        onKeyDown={handleKeyDown}
         onChange={onInputChange}
         onCompositionStart={handleCompositionStart}
         onCompositionEnd={handleCompositionEnd}
-          autoSize={{ minRows: 1, maxRows: 6 }}
       />
-        <Space>
-          {showUploadIcon && (
-            <Upload
-              onPreview={handlePreview}
-              onChange={handleChange}
-              multiple={false}
-              onRemove={handleRemove}
-              showUploadList={false}
-              beforeUpload={() => {
-                return false;
-              }}
-            >
-              <Button
-                type={'text'}
-                disabled={disabled}
-                icon={<Paperclip />}
-              ></Button>
-            </Upload>
-          )}
-          <Button
-            type="primary"
-            onClick={handlePressEnter}
-            loading={sendLoading}
-            disabled={sendDisabled || isUploadingFile}
-          >
-            {t('send')}
-          </Button>
-        </Space>
-      </Flex>
-
+      <Divider style={{ margin: '5px 30px 10px 0px' }} />
+      <Flex justify="space-between" align="center">
         {fileList.length > 0 && (
           <List
             grid={{
@@ -327,7 +309,9 @@ const MessageInput = ({
 
                     {item.status !== 'uploading' && (
                       <span className={styles.deleteIcon}>
-                      <CloseCircleOutlined onClick={() => handleRemove(item)} />
+                        <CloseCircleOutlined
+                          onClick={() => handleRemove(item)}
+                        />
                       </span>
                     )}
                   </Card>
@@ -336,6 +320,42 @@ const MessageInput = ({
             }}
           />
         )}
+        <Flex
+          gap={5}
+          align="center"
+          justify="flex-end"
+          style={{
+            paddingRight: 10,
+            paddingBottom: 10,
+            width: fileList.length > 0 ? '50%' : '100%',
+          }}
+        >
+          {showUploadIcon && (
+            <Upload
+              onPreview={handlePreview}
+              onChange={handleChange}
+              multiple={false}
+              onRemove={handleRemove}
+              showUploadList={false}
+              beforeUpload={() => {
+                return false;
+              }}
+            >
+              <Button type={'primary'} disabled={disabled}>
+                <PaperClipOutlined />
+              </Button>
+            </Upload>
+          )}
+          <Button
+            type="primary"
+            onClick={handlePressEnter}
+            loading={sendLoading}
+            disabled={sendDisabled || isUploadingFile || sendLoading}
+          >
+            <SendOutlined />
+          </Button>
+        </Flex>
+      </Flex>
     </Flex>
   );
 };