chat: simplify input handling (#3124)

* chat: simplify input handling

Removes the cursor save/restore functionality.

Removes most key handling.

Allows message to go over limit.

Moves the message length check into SendMessage.

Changes the chat input to change to the max style only when over the limit,
rather than at the limit. Makes it apparent that something is wrong.

Fixes #3121

* Prettified Code!

---------

Co-authored-by: jprjr <jprjr@users.noreply.github.com>

web/components/chat/ChatTextField/ChatTextField.tsx

@@ -33,44 +33,10 @@ export type ChatTextFieldProps = {
 
 const characterLimit = 300;
 
-function getCaretPosition(node) {
-  const selection = window.getSelection();
-
-  if (selection.rangeCount === 0) {
-    return 0;
-  }
-
-  const range = selection.getRangeAt(0);
-  const preCaretRange = range.cloneRange();
-  const tempElement = document.createElement('div');
-
-  preCaretRange.selectNodeContents(node);
-  preCaretRange.setEnd(range.endContainer, range.endOffset);
-  tempElement.appendChild(preCaretRange.cloneContents());
-
-  return tempElement.innerHTML.length;
-}
-
-function setCaretPosition(editableDiv, position) {
-  try {
-    const range = document.createRange();
-    const sel = window.getSelection();
-    range.selectNode(editableDiv);
-    range.setStart(editableDiv.childNodes[0], position);
-    range.collapse(true);
-
-    sel.removeAllRanges();
-    sel.addRange(range);
-  } catch (e) {
-    console.debug(e);
-  }
-}
-
 export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, focusInput }) => {
   const [characterCount, setCharacterCount] = useState(defaultText?.length);
   const websocketService = useRecoilValue<WebsocketService>(websocketServiceAtom);
   const text = useRef(defaultText || '');
-  const [savedCursorLocation, setSavedCursorLocation] = useState(0);
   const [customEmoji, setCustomEmoji] = useState([]);
 
   // This is a bit of a hack to force the component to re-render when the text changes.
@@ -80,11 +46,15 @@ export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, fo
   const getCharacterCount = () => text.current.length;
 
   const sendMessage = () => {
+    const count = getCharacterCount();
+
     if (!websocketService) {
       console.log('websocketService is not defined');
       return;
     }
 
+    if (count === 0 || count > characterLimit) return;
+
     let message = text.current;
     // Strip the opening and closing <p> tags.
     message = message.replace(/^<p>|<\/p>$/g, '');
@@ -99,6 +69,8 @@ export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, fo
   const insertTextAtEnd = (textToInsert: string) => {
     const output = text.current + textToInsert;
     text.current = output;
+
+    setCharacterCount(getCharacterCount());
     forceUpdate();
   };
 
@@ -114,42 +86,10 @@ export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, fo
   };
 
   const onKeyDown = (e: React.KeyboardEvent) => {
-    // Allow native line breaks
-    if (e.key === 'Enter' && e.shiftKey) {
-      return;
-    }
-
-    const charCount = getCharacterCount() + 1;
-
-    // Always allow backspace.
-    if (e.key === 'Backspace') {
-      return;
-    }
-
-    // Always allow delete.
-    if (e.key === 'Delete') {
-      return;
-    }
-
-    // Always allow ctrl + a.
-    if (e.key === 'a' && e.ctrlKey) {
-      return;
-    }
-
-    // Limit the number of characters.
-    if (charCount + 1 > characterLimit) {
-      e.preventDefault();
-      return;
-    }
-
-    // Send the message when hitting enter.
-    if (e.key === 'Enter') {
+    if (e.key === 'Enter' && !(e.shiftKey || e.metaKey || e.ctrlKey || e.altKey)) {
       e.preventDefault();
       sendMessage();
-      return;
     }
-
-    setCharacterCount(charCount + 1);
   };
 
   const handleChange = evt => {
@@ -167,31 +107,10 @@ export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, fo
         h3: 'p',
       },
     });
-    text.current = sanitized;
 
-    const charCountString = sanitized.replace(/<\/?[^>]+(>|$)/g, '');
-    setCharacterCount(charCountString.length);
+    if (text.current !== sanitized) text.current = sanitized;
 
-    setSavedCursorLocation(
-      getCaretPosition(document.getElementById('chat-input-content-editable')),
-    );
-  };
-
-  const handleBlur = () => {
-    // Save the cursor location.
-    setSavedCursorLocation(
-      getCaretPosition(document.getElementById('chat-input-content-editable')),
-    );
-  };
-
-  const handleFocus = () => {
-    if (!savedCursorLocation) {
-      return;
-    }
-
-    // Restore the cursor location.
-    setCaretPosition(document.getElementById('chat-input-content-editable'), savedCursorLocation);
-    setSavedCursorLocation(0);
+    setCharacterCount(getCharacterCount());
   };
 
   // Focus the input when the component mounts.
@@ -229,7 +148,7 @@ export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, fo
       <div
         className={classNames(
           styles.inputWrap,
-          characterCount >= characterLimit && styles.maxCharacters,
+          characterCount > characterLimit && styles.maxCharacters,
         )}
       >
         <ContentEditable
@@ -239,8 +158,6 @@ export const ChatTextField: FC<ChatTextFieldProps> = ({ defaultText, enabled, fo
           disabled={!enabled}
           onKeyDown={onKeyDown}
           onChange={handleChange}
-          onBlur={handleBlur}
-          onFocus={handleFocus}
           style={{ width: '100%' }}
           role="textbox"
           aria-label="Chat text input"