initial set up for styling updates; actually add files

webroot/js/chat/content-editable.js

@@ -0,0 +1,131 @@
+/*
+Since we can't really import react-contenteditable here, I'm borrowing code for this component from here:
+github.com/lovasoa/react-contenteditable/
+
+and here:
+https://stackoverflow.com/questions/22677931/react-js-onchange-event-for-contenteditable/27255103#27255103
+
+*/
+
+import { Component, createRef, createElement } from 'https://unpkg.com/preact?module';
+
+function replaceCaret(el) {
+  // Place the caret at the end of the element
+  const target = document.createTextNode('');
+  el.appendChild(target);
+  // do not move caret if element was not focused
+  const isTargetFocused = document.activeElement === el;
+  if (target !== null && target.nodeValue !== null && isTargetFocused) {
+    var sel = window.getSelection();
+    if (sel !== null) {
+      var range = document.createRange();
+      range.setStart(target, target.nodeValue.length);
+      range.collapse(true);
+      sel.removeAllRanges();
+      sel.addRange(range);
+    }
+    if (el) el.focus();
+  }
+}
+
+function normalizeHtml(str) {
+  return str && str.replace(/ |\u202F|\u00A0/g, ' ');
+}
+
+
+
+export default class ContentEditable extends Component {
+  constructor(props) {
+    super(props);
+
+    this.el = createRef();
+
+    this.lastHtml = '';
+
+    this.emitChange = this.emitChange.bind(this);
+    this.getDOMElement = this.getDOMElement.bind(this);
+  }
+
+  shouldComponentUpdate(nextProps) {
+    const { props } = this;
+    const el = this.getDOMElement();
+
+    // We need not rerender if the change of props simply reflects the user's edits.
+    // Rerendering in this case would make the cursor/caret jump
+
+    // Rerender if there is no element yet... (somehow?)
+    if (!el) return true;
+
+    // ...or if html really changed... (programmatically, not by user edit)
+    if (
+      normalizeHtml(nextProps.html) !== normalizeHtml(el.innerHTML)
+    ) {
+      return true;
+    }
+
+    // Handle additional properties
+    return props.disabled !== nextProps.disabled ||
+      props.tagName !== nextProps.tagName ||
+      props.className !== nextProps.className ||
+      props.innerRef !== nextProps.innerRef;
+  }
+
+
+
+  componentDidUpdate() {
+    const el = this.getDOMElement();
+    if (!el) return;
+
+    // Perhaps React (whose VDOM gets outdated because we often prevent
+    // rerendering) did not update the DOM. So we update it manually now.
+    if (this.props.html !== el.innerHTML) {
+      el.innerHTML = this.props.html;
+    }
+    this.lastHtml = this.props.html;
+    replaceCaret(el);
+  }
+
+  getDOMElement() {
+    return (this.props.innerRef && typeof this.props.innerRef !== 'function' ? this.props.innerRef : this.el).current;
+  }
+
+
+  emitChange(originalEvt) {
+    const el = this.getDOMElement();
+    if (!el) return;
+
+    const html = el.innerHTML;
+    if (this.props.onChange && html !== this.lastHtml) {
+      // Clone event with Object.assign to avoid
+      // "Cannot assign to read only property 'target' of object"
+      const evt = Object.assign({}, originalEvt, {
+        target: {
+          value: html
+        }
+      });
+      this.props.onChange(evt);
+    }
+    this.lastHtml = html;
+  }
+
+  render(props) {
+    const { html, innerRef } = props;
+    return createElement(
+      'div',
+      {
+        ...props,
+        ref: typeof innerRef === 'function' ? (current) => {
+          innerRef(current)
+          this.el.current = current
+        } : innerRef || this.el,
+        onInput: this.emitChange,
+        onBlur: this.props.onBlur || this.emitChange,
+        onKeyup: this.props.onKeyUp || this.emitChange,
+        onKeydown: this.props.onKeyDown || this.emitChange,
+        contentEditable: !this.props.disabled,
+        dangerouslySetInnerHTML: { __html: html },
+      },
+      this.props.children,
+    );
+  }
+}