add tooltip element (based on floating ui)

frontend/app/element/tooltip.tsx

@@ -0,0 +1,144 @@
+// Copyright 2025, Command Line Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+import {
+    FloatingPortal,
+    autoUpdate,
+    flip,
+    offset,
+    shift,
+    useFloating,
+    useHover,
+    useInteractions,
+} from "@floating-ui/react";
+import { cn } from "@/util/util";
+import { useEffect, useRef, useState } from "react";
+
+interface TooltipProps {
+    children: React.ReactNode;
+    content: React.ReactNode;
+    placement?: "top" | "bottom" | "left" | "right";
+    forceOpen?: boolean;
+    divClassName?: string;
+    divStyle?: React.CSSProperties;
+    divOnClick?: (e: React.MouseEvent<HTMLDivElement>) => void;
+}
+
+export function Tooltip({
+    children,
+    content,
+    placement = "top",
+    forceOpen = false,
+    divClassName,
+    divStyle,
+    divOnClick,
+}: TooltipProps) {
+    const [isOpen, setIsOpen] = useState(forceOpen);
+    const [isVisible, setIsVisible] = useState(false);
+    const timeoutRef = useRef<number | null>(null);
+    const prevForceOpenRef = useRef<boolean>(forceOpen);
+
+    const { refs, floatingStyles, context } = useFloating({
+        open: isOpen,
+        onOpenChange: (open) => {
+            if (!open && forceOpen) {
+                return;
+            }
+            if (open) {
+                setIsOpen(true);
+                if (timeoutRef.current !== null) {
+                    window.clearTimeout(timeoutRef.current);
+                }
+                timeoutRef.current = window.setTimeout(() => {
+                    setIsVisible(true);
+                }, 300);
+            } else {
+                setIsVisible(false);
+                if (timeoutRef.current !== null) {
+                    window.clearTimeout(timeoutRef.current);
+                }
+                timeoutRef.current = window.setTimeout(() => {
+                    setIsOpen(false);
+                }, 300);
+            }
+        },
+        placement,
+        middleware: [
+            offset(10),
+            flip(),
+            shift({ padding: 12 }),
+        ],
+        whileElementsMounted: autoUpdate,
+    });
+
+    useEffect(() => {
+        if (forceOpen) {
+            setIsOpen(true);
+            setIsVisible(true);
+
+            if (timeoutRef.current !== null) {
+                window.clearTimeout(timeoutRef.current);
+                timeoutRef.current = null;
+            }
+        } else {
+            if (context.open && !prevForceOpenRef.current) {
+                // Keep it open if it's being hovered and wasn't forced open before
+            } else {
+                setIsVisible(false);
+
+                if (timeoutRef.current !== null) {
+                    window.clearTimeout(timeoutRef.current);
+                }
+
+                timeoutRef.current = window.setTimeout(() => {
+                    setIsOpen(false);
+                }, 300);
+            }
+        }
+
+        prevForceOpenRef.current = forceOpen;
+    }, [forceOpen, context.open]);
+
+    useEffect(() => {
+        return () => {
+            if (timeoutRef.current !== null) {
+                window.clearTimeout(timeoutRef.current);
+            }
+        };
+    }, []);
+
+    const hover = useHover(context);
+    const { getReferenceProps, getFloatingProps } = useInteractions([hover]);
+
+    return (
+        <>
+            <div
+                ref={refs.setReference}
+                {...getReferenceProps()}
+                className={divClassName}
+                style={divStyle}
+                onClick={divOnClick}
+            >
+                {children}
+            </div>
+            {isOpen && (
+                <FloatingPortal>
+                    <div
+                        ref={refs.setFloating}
+                        style={{
+                            ...floatingStyles,
+                            opacity: isVisible ? 1 : 0,
+                            transition: "opacity 200ms ease",
+                        }}
+                        {...getFloatingProps()}
+                        className={cn(
+                            "bg-white dark:bg-panel border border-border rounded-md px-2 py-1 text-xs text-foreground shadow-xl z-50"
+                        )}
+                    >
+                        {content}
+                    </div>
+                </FloatingPortal>
+            )}
+        </>
+    );
+}