add editor

src/uhm/lib/editor/draft/useDraftState.ts

@@ -0,0 +1,31 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import type { FeatureCollection } from "@/uhm/types/geo";
+import { deepClone } from "@/uhm/lib/editor/draft/draftDiff";
+
+export function useDraftState(initialData: FeatureCollection) {
+    // Draft hiện tại (React state) để UI re-render khi dữ liệu thay đổi.
+    const [draft, setDraft] = useState<FeatureCollection>(() => deepClone(initialData));
+    // Draft ref để đọc giá trị mới nhất trong event handlers/engines mà không cần deps.
+    const draftRef = useRef<FeatureCollection>(deepClone(initialData));
+
+    const commitDraft = useCallback((nextDraft: FeatureCollection) => {
+        const cloned = deepClone(nextDraft);
+        draftRef.current = cloned;
+        setDraft(cloned);
+    }, []);
+
+    useEffect(() => {
+        draftRef.current = draft;
+    }, [draft]);
+
+    const resetDraft = useCallback((nextDraft: FeatureCollection) => {
+        commitDraft(nextDraft);
+    }, [commitDraft]);
+
+    return {
+        draft,
+        draftRef,
+        commitDraft,
+        resetDraft,
+    };
+}