style upgrades

src/components/sheet/sheet.tsx

@@ -1,4 +1,11 @@
-import { PropsWithChildren, Suspense, useCallback } from "react";
+import {
+  PropsWithChildren,
+  Suspense,
+  useCallback,
+  useEffect,
+  useRef,
+  useState,
+} from "react";
 import { useIsMobile } from "@/hooks/use-is-mobile";
 import Drawer from "./drawer";
 import Modal from "./modal";
@@ -10,13 +17,35 @@ interface SheetProps extends PropsWithChildren {
   onChange: (next: boolean) => void;
 }
 
+const DRAWER_EXIT_MS = 500;
+const MODAL_EXIT_MS = 200;
+const EXIT_BUFFER_MS = 100;
+
 const Sheet: React.FC<SheetProps> = ({ title, children, opened, onChange }) => {
   const isMobile = useIsMobile();
   const handleClose = useCallback(() => onChange(false), [onChange]);
 
+  const [mounted, setMounted] = useState(opened);
+  const openedRef = useRef(opened);
+  openedRef.current = opened;
+  const handleExited = useCallback(() => {
+    if (!openedRef.current) setMounted(false);
+  }, []);
+
+  useEffect(() => {
+    if (opened) {
+      setMounted(true);
+      return;
+    }
+    const exitDuration =
+      (isMobile ? DRAWER_EXIT_MS : MODAL_EXIT_MS) + EXIT_BUFFER_MS;
+    const timer = window.setTimeout(() => setMounted(false), exitDuration);
+    return () => window.clearTimeout(timer);
+  }, [opened, isMobile]);
+
   const SheetComponent = isMobile ? Drawer : Modal;
 
-  if (!opened) return null;
+  if (!opened && !mounted) return null;
 
   return (
     <SheetComponent
@@ -24,6 +53,7 @@ const Sheet: React.FC<SheetProps> = ({ title, children, opened, onChange }) => {
       opened={opened}
       onChange={onChange}
       onClose={handleClose}
+      onExited={handleExited}
     >
       <Suspense fallback={
         <Flex justify='center' align='center' w='100%' style={{ minHeight: '25vh' }}>