From 6ec259a0e71174651bae95d4628138bf6fd68742 Mon Sep 17 00:00:00 2001
From: kj_sh604
Date: Sun, 15 Mar 2026 16:19:35 -0400
Subject: refactor: packages/

---
 .../components/TTDDialog/MermaidToExcalidraw.tsx   | 132 +++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 packages/excalidraw/components/TTDDialog/MermaidToExcalidraw.tsx

(limited to 'packages/excalidraw/components/TTDDialog/MermaidToExcalidraw.tsx')

diff --git a/packages/excalidraw/components/TTDDialog/MermaidToExcalidraw.tsx b/packages/excalidraw/components/TTDDialog/MermaidToExcalidraw.tsx
new file mode 100644
index 0000000..83fb91d
--- /dev/null
+++ b/packages/excalidraw/components/TTDDialog/MermaidToExcalidraw.tsx
@@ -0,0 +1,132 @@
+import { useState, useRef, useEffect, useDeferredValue } from "react";
+import type { BinaryFiles } from "../../types";
+import { useApp } from "../App";
+import type { NonDeletedExcalidrawElement } from "../../element/types";
+import { ArrowRightIcon } from "../icons";
+import "./MermaidToExcalidraw.scss";
+import { t } from "../../i18n";
+import Trans from "../Trans";
+import type { MermaidToExcalidrawLibProps } from "./common";
+import {
+  convertMermaidToExcalidraw,
+  insertToEditor,
+  saveMermaidDataToStorage,
+} from "./common";
+import { TTDDialogPanels } from "./TTDDialogPanels";
+import { TTDDialogPanel } from "./TTDDialogPanel";
+import { TTDDialogInput } from "./TTDDialogInput";
+import { TTDDialogOutput } from "./TTDDialogOutput";
+import { EditorLocalStorage } from "../../data/EditorLocalStorage";
+import { EDITOR_LS_KEYS } from "../../constants";
+import { debounce, isDevEnv } from "../../utils";
+import { TTDDialogSubmitShortcut } from "./TTDDialogSubmitShortcut";
+
+const MERMAID_EXAMPLE =
+  "flowchart TD\n A[Christmas] -->|Get money| B(Go shopping)\n B --> C{Let me think}\n C -->|One| D[Laptop]\n C -->|Two| E[iPhone]\n C -->|Three| F[Car]";
+
+const debouncedSaveMermaidDefinition = debounce(saveMermaidDataToStorage, 300);
+
+const MermaidToExcalidraw = ({
+  mermaidToExcalidrawLib,
+}: {
+  mermaidToExcalidrawLib: MermaidToExcalidrawLibProps;
+}) => {
+  const [text, setText] = useState(
+    () =>
+      EditorLocalStorage.get<string>(EDITOR_LS_KEYS.MERMAID_TO_EXCALIDRAW) ||
+      MERMAID_EXAMPLE,
+  );
+  const deferredText = useDeferredValue(text.trim());
+  const [error, setError] = useState<Error | null>(null);
+
+  const canvasRef = useRef<HTMLDivElement>(null);
+  const data = useRef<{
+    elements: readonly NonDeletedExcalidrawElement[];
+    files: BinaryFiles | null;
+  }>({ elements: [], files: null });
+
+  const app = useApp();
+
+  useEffect(() => {
+    convertMermaidToExcalidraw({
+      canvasRef,
+      data,
+      mermaidToExcalidrawLib,
+      setError,
+      mermaidDefinition: deferredText,
+    }).catch((err) => {
+      if (isDevEnv()) {
+        console.error("Failed to parse mermaid definition", err);
+      }
+    });
+
+    debouncedSaveMermaidDefinition(deferredText);
+  }, [deferredText, mermaidToExcalidrawLib]);
+
+  useEffect(
+    () => () => {
+      debouncedSaveMermaidDefinition.flush();
+    },
+    [],
+  );
+
+  const onInsertToEditor = () => {
+    insertToEditor({
+      app,
+      data,
+      text,
+      shouldSaveMermaidDataToStorage: true,
+    });
+  };
+
+  return (
+    <>
+      <div className="ttd-dialog-desc">
+        <Trans
+          i18nKey="mermaid.description"
+          flowchartLink={(el) => (
+            <a href="https://mermaid.js.org/syntax/flowchart.html">{el}</a>
+          )}
+          sequenceLink={(el) => (
+            <a href="https://mermaid.js.org/syntax/sequenceDiagram.html">
+              {el}
+            </a>
+          )}
+          classLink={(el) => (
+            <a href="https://mermaid.js.org/syntax/classDiagram.html">{el}</a>
+          )}
+        />
+      </div>
+      <TTDDialogPanels>
+        <TTDDialogPanel label={t("mermaid.syntax")}>
+          <TTDDialogInput
+            input={text}
+            placeholder={"Write Mermaid diagram defintion here..."}
+            onChange={(event) => setText(event.target.value)}
+            onKeyboardSubmit={() => {
+              onInsertToEditor();
+            }}
+          />
+        </TTDDialogPanel>
+        <TTDDialogPanel
+          label={t("mermaid.preview")}
+          panelAction={{
+            action: () => {
+              onInsertToEditor();
+            },
+            label: t("mermaid.button"),
+            icon: ArrowRightIcon,
+          }}
+          renderSubmitShortcut={() => <TTDDialogSubmitShortcut />}
+        >
+          <TTDDialogOutput
+            canvasRef={canvasRef}
+            loaded={mermaidToExcalidrawLib.loaded}
+            error={error}
+          />
+        </TTDDialogPanel>
+      </TTDDialogPanels>
+    </>
+  );
+};
+export default MermaidToExcalidraw;
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