feat: add discover back to top fab

Signed-off-by: Innei <i@innei.in>

src/renderer/src/components/ui/fab/FABContainer.tsx

@@ -0,0 +1,107 @@
+import { m } from "@renderer/components/common/Motion"
+import { useTypeScriptHappyCallback } from "@renderer/hooks/common/useTypescriptHappyCallback"
+import { jotaiStore } from "@renderer/lib/jotai"
+import { cn } from "@renderer/lib/utils"
+import clsx from "clsx"
+import { typescriptHappyForwardRef } from "foxact/typescript-happy-forward-ref"
+import type { HTMLMotionProps } from "framer-motion"
+import { AnimatePresence } from "framer-motion"
+import { atom, useAtomValue } from "jotai"
+import type React from "react"
+import type { JSX, PropsWithChildren, ReactNode } from "react"
+import { useId } from "react"
+
+import { RootPortal } from "../portal"
+
+const fabContainerElementAtom = atom(null as HTMLDivElement | null)
+
+export interface FABConfig {
+  id: string
+  icon: JSX.Element
+  onClick: () => void
+}
+
+export const FABBase = typescriptHappyForwardRef(
+  (
+    props: PropsWithChildren<
+      {
+        id: string
+        show?: boolean
+        children: JSX.Element
+      } & HTMLMotionProps<"button">
+    >,
+    ref: React.ForwardedRef<HTMLButtonElement>,
+  ) => {
+    const { children, show = true, ...extra } = props
+    const { className, ...rest } = extra
+
+    return (
+      <AnimatePresence>
+        {show && (
+          <m.button
+            type="button"
+            initial={{ scale: 0, opacity: 0 }}
+            animate={{ scale: 1, opacity: 1 }}
+            exit={{ scale: 0, opacity: 0 }}
+            ref={ref}
+            aria-label="Floating action button"
+            className={cn(
+              "mt-2 flex items-center justify-center",
+              "size-9 text-lg md:text-base",
+              "outline-accent hover:opacity-100 focus:opacity-100 focus:outline-none",
+              "rounded-xl border border-zinc-400/20 backdrop-blur-lg dark:border-zinc-500/30 dark:text-zinc-200",
+              "bg-zinc-50/80 shadow-lg dark:bg-neutral-900/80",
+              "transition-all duration-500 ease-in-out",
+
+              className,
+            )}
+            {...rest}
+          >
+            {children}
+          </m.button>
+        )}
+      </AnimatePresence>
+    )
+  },
+)
+
+export const FABPortable = typescriptHappyForwardRef(
+  (
+    props: {
+      children: React.JSX.Element
+      onClick: () => void
+      show?: boolean
+    },
+    ref: React.ForwardedRef<HTMLButtonElement>,
+  ) => {
+    const { onClick, children, show = true } = props
+    const id = useId()
+    const portalElement = useAtomValue(fabContainerElementAtom)
+
+    if (!portalElement) return null
+
+    return (
+      <RootPortal to={portalElement}>
+        <FABBase ref={ref} id={id} show={show} onClick={onClick}>
+          {children}
+        </FABBase>
+      </RootPortal>
+    )
+  },
+)
+
+export const FABContainer = (props: { children?: ReactNode }) => {
+  return (
+    <div
+      ref={useTypeScriptHappyCallback((ref) => jotaiStore.set(fabContainerElementAtom, ref), [])}
+      data-testid="fab-container"
+      data-hide-print
+      className={clsx(
+        "fixed bottom-[calc(2rem+env(safe-area-inset-bottom))] left-[calc(100vw-3rem-1rem)] z-[9] flex flex-col",
+        "transition-transform duration-300 ease-in-out",
+      )}
+    >
+      {props.children}
+    </div>
+  )
+}

src/renderer/src/components/ui/fab/index.ts

@@ -0,0 +1 @@
+export * from "./FABContainer"

src/renderer/src/modules/discover/feed-form.tsx

@@ -91,7 +91,9 @@ export const FeedForm: Component<{
         <div className="center grow flex-col gap-3">
           <i className="i-mgc-close-cute-re size-7 text-red-500" />
           <p>Error in fetching feed.</p>
-          <p className="break-all px-8 text-center">{getFetchErrorMessage(feedQuery.error)}</p>
+          <p className="cursor-text select-text break-all px-8 text-center">
+            {getFetchErrorMessage(feedQuery.error)}
+          </p>
 
           <div className="flex items-center gap-4">
             <Button

src/renderer/src/pages/(main)/(layer)/(subview)/discover/index.tsx

@@ -41,6 +41,7 @@ export function Component() {
   const [search, setSearch] = useSearchParams()
   const { t } = useTranslation()
   useSubViewTitle("Discover")
+
   return (
     <>
       <div className="text-2xl font-bold">{t("words.discover")}</div>

src/renderer/src/pages/(main)/(layer)/(subview)/layout.tsx

@@ -1,7 +1,9 @@
 import { getReadonlyRoute } from "@renderer/atoms/route"
 import { getSidebarActiveView, setSidebarActiveView } from "@renderer/atoms/sidebar"
 import { MotionButtonBase } from "@renderer/components/ui/button"
+import { FABContainer, FABPortable } from "@renderer/components/ui/fab"
 import { ScrollArea } from "@renderer/components/ui/scroll-area"
+import { springScrollTo } from "@renderer/lib/scroller"
 import { cn } from "@renderer/lib/utils"
 import { useEffect, useRef, useState } from "react"
 import { Outlet, useNavigate } from "react-router-dom"
@@ -20,13 +22,14 @@ export function Component() {
     const $scroll = scrollRef
 
     if (!$scroll) return
-    $scroll.scrollTop = 0
 
-    $scroll.onscroll = () => {
+    springScrollTo(0, $scroll)
+    const handler = () => {
       setIsTitleSticky($scroll.scrollTop > 120)
     }
+    $scroll.addEventListener("scroll", handler)
     return () => {
-      $scroll.onscroll = null
+      $scroll.removeEventListener("scroll", handler)
     }
   }, [scrollRef, title])
 
@@ -65,6 +68,23 @@ export function Component() {
       >
         <Outlet />
       </ScrollArea.ScrollArea>
+
+      <FABContainer>
+        <BackToTopFAB show={isTitleSticky} scrollRef={scrollRef} />
+      </FABContainer>
     </div>
   )
 }
+
+const BackToTopFAB = ({ show, scrollRef }: { show: boolean; scrollRef: any }) => {
+  return (
+    <FABPortable
+      onClick={() => {
+        springScrollTo(0, scrollRef)
+      }}
+      show={show}
+    >
+      <i className="i-mingcute-arow-to-up-line" />
+    </FABPortable>
+  )
+}