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import { Editor } from "@tinymce/tinymce-react";
import { useTheme } from "@mui/material/styles";
import "tinymce/tinymce";
import "tinymce/icons/default";
import "tinymce/themes/silver";
import "tinymce/plugins/autoresize";
import "tinymce/models/dom/model";
import "@/lib/tinymce/plugins/math-formula";
import "@/lib/tinymce/plugins/graph2d/tinymceGraph2dOpenUrlPlugin.js";
import { getGraph2dEditorUrl } from "@/lib/tinymce/plugins/graph2d/plugin";
import { Box } from "@mui/material";
import {
questionCardSurfaceBg,
READ_ONLY_MATH_CHOICE_CONTENT_PADDING,
READ_ONLY_MATH_CONTENT_PADDING,
} from "@/utils/components/question-bank/question-display/utils/questionCardStyles";
const GRAPH_SELECTION_OUTLINE = "#1976d2";
function isLightBackground(color) {
Eif (!color) return false;
const normalized = color.replace(/\s/g, "").toLowerCase();
if (
normalized === "white" ||
normalized === "#fff" ||
normalized === "#ffffff" ||
normalized === "rgb(255,255,255)" ||
normalized === "rgba(255,255,255,1)"
) {
return true;
}
const rgb = normalized.match(/^rgba?\((\d+),(\d+),(\d+)/);
if (rgb) {
const [r, g, b] = rgb.slice(1, 4).map(Number);
return r >= 240 && g >= 240 && b >= 240;
}
return false;
}
/**
* TinyMCE's silver theme renders the UI hidden (inline `visibility:hidden`
* on `.tox-tinymce`) while it measures layout, then reveals it once its own
* post-init promise chain resolves. With `skin: false` (self-hosted, no skin
* stylesheet) that promise never resolves for a subset of instances when many
* editors mount at once — the container is left permanently hidden and frozen
* at `autoresize_min_height`, even though the iframe body has the real content.
* Revealing and re-measuring by hand here sidesteps that stuck promise instead
* of depending on it.
*/
function revealAndResizeEditor(editor) {
const container = editor?.getContainer?.();
const body = editor?.getBody?.();
Iif (!container || !body) return;
const height = `${body.scrollHeight}px`;
container.style.visibility = "visible";
container.style.height = height;
// getContainer() is only the outer `.tox-tinymce` shell — its `.tox-edit-area`/iframe
// children keep their own stale height (overflow: visible by default), so without this
// the taller-than-needed iframe visually bleeds past the shrunk container and paints
// over whatever content follows it on the page.
Eif (editor.iframeElement) {
editor.iframeElement.style.height = height;
}
}
/**
* Keeps `iframeElement.style.height` mirrored to the container's height on an
* ongoing basis. TinyMCE's own `autoresize` plugin keeps `.tox-tinymce` (the
* container) correctly sized to the iframe body's content at all times, but
* `revealAndResizeEditor` above is the ONLY code that sizes the iframe
* element itself, and it only runs from the `init`/`SetContent` handlers.
* Content that grows the body height AFTER those fire — e.g. a graph2d
* embed's `blob:` URL image, which decodes and loads asynchronously — never
* gets a matching iframe resize, so the stale (shorter) iframe height clips
* the now-taller body via its `overflow: hidden`. A ResizeObserver on the
* container catches that late growth (autoresize already reacts to it) and
* reapplies it to the iframe.
*/
function observeContainerResize(editor) {
const container = editor?.getContainer?.();
Eif (!container || typeof ResizeObserver === "undefined") return undefined;
const ro = new ResizeObserver(() => {
if (editor.iframeElement) {
editor.iframeElement.style.height = container.style.height || `${container.clientHeight}px`;
}
});
ro.observe(container);
return () => ro.disconnect();
}
function applyReadOnlyEditorColors(editor, textColor, backgroundColor) {
const doc = editor?.getDoc?.();
Iif (!doc) return;
const applyTo = (el) => {
Iif (!el) return;
el.style.setProperty("background-color", backgroundColor, "important");
el.style.setProperty("color", textColor, "important");
};
applyTo(doc.documentElement);
applyTo(doc.body);
doc.querySelectorAll("*").forEach((node) => {
if (node === doc.documentElement || node === doc.body) return;
const inlineBg = node.style?.backgroundColor;
Iif (isLightBackground(inlineBg)) {
node.style.setProperty("background-color", "transparent", "important");
}
node.style.setProperty("color", textColor, "important");
});
}
/**
* @param {{ content?: string, backgroundColor?: string, sx?: object, onEditorInit?: Function, fontSize?: string }} props
* backgroundColor must be a solid color — TinyMCE iframes cannot inherit parent backgrounds.
* fontSize overrides the compact/non-compact default (e.g. so a caller can render question
* text, choices, and math formulas/symbols — the `.mfe-formula` rule is `font-size: 1em`,
* so it tracks whatever this ends up being — all at one uniform size; see
* studentQuestionSurfaces.js's STUDENT_QUESTION_FONT_SIZE for the take-assignment page's use).
*/
const TinyMCETextEditorReadOnly = ({
content,
backgroundColor,
compact = false,
sx: sxProp,
onEditorInit,
fontSize: fontSizeProp,
}) => {
const theme = useTheme();
const editorRef = useRef(null);
const textColor = theme.palette.text.primary;
const surfaceBg = backgroundColor ?? questionCardSurfaceBg(theme);
const contentPadding = compact ? READ_ONLY_MATH_CHOICE_CONTENT_PADDING : READ_ONLY_MATH_CONTENT_PADDING;
const lineHeight = compact ? 1.3 : 1.5;
const fontSize = fontSizeProp ?? (compact ? "17px" : "20px");
const minHeight = compact ? 22 : 24;
const bottomMargin = compact ? 2 : 4;
// A caller that derives `backgroundColor` from state set in a post-mount effect
// (e.g. a selected multiple-choice/checkbox option restoring its answer on
// question revisit — see MultipleChoiceOption.jsx/CheckboxOption.jsx) can change
// colors before TinyMCE's own async init has finished, i.e. before `handleInit`
// ever runs. `@tinymce/tinymce-react` only registers `onInit` once at mount, so
// by the time it actually fires it can call a stale closure still holding the
// FIRST render's (wrong) colors — the live-update effect below can't correct
// this either, since it only re-runs on a LATER color change, not this first
// one. Reading colors from a ref that's kept current every render, instead of
// closing over them, means `handleInit` always applies whatever's freshest at
// the moment TinyMCE actually calls it, regardless of when that is.
const latestColorsRef = useRef({ textColor, surfaceBg });
latestColorsRef.current = { textColor, surfaceBg };
const handleInit = useCallback(
(_, editor) => {
editorRef.current = editor;
applyReadOnlyEditorColors(editor, latestColorsRef.current.textColor, latestColorsRef.current.surfaceBg);
onEditorInit?.(editor);
},
[onEditorInit]
);
useEffect(() => {
Iif (editorRef.current) {
applyReadOnlyEditorColors(editorRef.current, textColor, surfaceBg);
}
}, [textColor, surfaceBg]);
const editorInit = useMemo(
() => ({
license_key: "gpl",
branding: false,
skin: false,
content_css: false,
readonly: true,
toolbar: false,
menubar: false,
statusbar: false,
plugins: ["autoresize", "matheditor", "graph2d"],
autoresize_bottom_margin: bottomMargin,
autoresize_min_height: minHeight,
min_height: minHeight,
graph2d_url: getGraph2dEditorUrl(),
graph2d_size_percent: 90,
object_resizing: false,
content_style: `html, body {
background-color: ${surfaceBg} !important;
color: ${textColor} !important;
line-height: ${lineHeight};
cursor: default;
caret-color: transparent;
margin: 0;
padding: ${contentPadding};
overflow: hidden;
font-size: ${fontSize};
}
body p, body div, body li, body td, body th, body a {
background-color: transparent !important;
color: ${textColor} !important;
}
body span:not([style*="background-color"]) {
background-color: transparent !important;
color: ${textColor} !important;
}
.mfe-formula, .mfe-formula * {
background: transparent !important;
background-color: transparent !important;
}
p { margin: 0; padding: 0; }
.bordered-text-block { border: 1px solid currentColor; border-radius: 4px; padding: 8px 12px; margin: 8px 0; }
.graph2d-embed { display: inline-block; vertical-align: middle; }
.graph2d-embed img { display: block; height: auto; vertical-align: middle; }
.graph2d-embed[data-mce-selected="1"] { outline: 2px solid ${GRAPH_SELECTION_OUTLINE}; outline-offset: 2px; }
.mce-offscreen-selection:has(.graph2d-embed) { display: none !important; }`,
// Explicit allow-list instead of the wildcard "*[.*]" — prevents
// arbitrary attributes/event-handlers (on*, javascript: etc.) from
// surviving in read-only rendered content.
// math-field: custom element for mathlive (read-only attribute required)
// span.mfe-formula: math-formula plugin wrapper (data-latex carries LaTeX source)
// div.graph2d-embed: graph2d plugin placeholder (data-graph2d carries encoded graph)
extended_valid_elements: [
"span[class|style|data-latex|contenteditable|data-mce-selected]",
"div[class|style|data-graph2d|contenteditable|data-mce-selected]",
"math-field[read-only|style|class|data-mce-selected]",
].join(","),
custom_elements: "math-field",
// `editorInit` (this whole object) is only ever actually handed to
// tinymce.init() once — @tinymce/tinymce-react doesn't reinitialize the
// editor when a recomputed `init` prop comes in on a later render — so
// these handlers close over whichever textColor/surfaceBg were current
// at THAT first render. Reading latestColorsRef.current instead (kept
// fresh every render, see above) means "init"/"SetContent" firing late
// — e.g. after a post-mount effect corrects a restored selection's color
// — still paints the color that's actually current instead of replaying
// the stale one baked in at mount.
setup: (editor) => {
editor.on("init", () => {
applyReadOnlyEditorColors(
editor,
latestColorsRef.current.textColor,
latestColorsRef.current.surfaceBg
);
revealAndResizeEditor(editor);
const stopObserving = observeContainerResize(editor);
Iif (stopObserving) {
editor.on("remove", stopObserving);
}
});
editor.on("SetContent", () => {
applyReadOnlyEditorColors(
editor,
latestColorsRef.current.textColor,
latestColorsRef.current.surfaceBg
);
revealAndResizeEditor(editor);
});
},
}),
[textColor, surfaceBg, contentPadding, lineHeight, fontSize, minHeight, bottomMargin]
);
Iif (!content) return null;
const normalizedContent = typeof content === "string" ? content : String(content);
return (
<Box
className="read-only-tinymce"
sx={{
pointerEvents: "none",
width: "100%",
color: "text.primary",
bgcolor: surfaceBg,
"& .tox-tinymce": {
border: "none !important",
backgroundColor: `${surfaceBg} !important`,
boxShadow: "none !important",
// Belt-and-suspenders for revealAndResizeEditor above — TinyMCE's own
// reveal-after-init can get stuck leaving this hidden (see setup()).
visibility: "visible !important",
},
"& .tox-editor-container": {
backgroundColor: `${surfaceBg} !important`,
},
"& .tox-edit-area": {
backgroundColor: `${surfaceBg} !important`,
},
"& .tox-edit-area__iframe": {
backgroundColor: `${surfaceBg} !important`,
},
"& iframe": {
backgroundColor: `${surfaceBg} !important`,
},
...sxProp,
}}
>
<Editor
key={theme.palette.mode}
value={normalizedContent}
onEditorChange={() => {}}
onInit={handleInit}
init={editorInit}
/>
</Box>
);
};
export default TinyMCETextEditorReadOnly;
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