feat(mobile): optimize home header animation (#8707)

close AF-1420

![CleanShot 2024-11-05 at 17.17.29.gif](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/LakojjjzZNf6ogjOVwKE/a74ead2d-30ef-4bb1-8714-fdc77dd93335.gif)

packages/frontend/core/src/mobile/components/workspace-selector/index.tsx

@@ -1,12 +1,21 @@
 import { MobileMenu } from '@affine/component';
 import { track } from '@affine/track';
 import { useServiceOptional, WorkspacesService } from '@toeverything/infra';
-import { useCallback, useEffect, useState } from 'react';
+import {
+  forwardRef,
+  type HTMLAttributes,
+  useCallback,
+  useEffect,
+  useState,
+} from 'react';
 
 import { CurrentWorkspaceCard } from './current-card';
 import { SelectorMenu } from './menu';
 
-export const WorkspaceSelector = () => {
+export const WorkspaceSelector = forwardRef<
+  HTMLDivElement,
+  HTMLAttributes<HTMLDivElement>
+>(function WorkspaceSelector({ className }, ref) {
   const [open, setOpen] = useState(false);
   const workspaceManager = useServiceOptional(WorkspacesService);
 
@@ -33,7 +42,11 @@ export const WorkspaceSelector = () => {
         style: { padding: 0 },
       }}
     >
-      <CurrentWorkspaceCard onClick={openMenu} />
+      <CurrentWorkspaceCard
+        ref={ref}
+        onClick={openMenu}
+        className={className}
+      />
     </MobileMenu>
   );
-};
+});

packages/frontend/core/src/mobile/views/home-header/index.tsx

@@ -9,7 +9,7 @@ import { useI18n } from '@affine/i18n';
 import { SettingsIcon } from '@blocksuite/icons/rc';
 import { useService } from '@toeverything/infra';
 import clsx from 'clsx';
-import { useCallback, useState } from 'react';
+import { useCallback, useRef, useState } from 'react';
 
 import { SearchInput, WorkspaceSelector } from '../../components';
 import { searchVTScope } from '../../components/search-input/style.css';
@@ -23,18 +23,12 @@ import * as styles from './styles.css';
  *   - hide Search
  */
 export const HomeHeader = () => {
-  const t = useI18n();
-  const workbench = useService(WorkbenchService).workbench;
   const globalDialogService = useService(GlobalDialogService);
 
-  const [dense, setDense] = useState(false);
-
-  useGlobalEvent(
-    'scroll',
-    useCallback(() => {
-      setDense(window.scrollY > 114);
-    }, [])
-  );
+  const workspaceCardRef = useRef<HTMLDivElement>(null);
+  const floatWorkspaceCardRef = useRef<HTMLDivElement>(null);
+  const t = useI18n();
+  const workbench = useService(WorkbenchService).workbench;
 
   const navSearch = useCallback(() => {
     startScopedViewTransition(searchVTScope, () => {
@@ -42,33 +36,49 @@ export const HomeHeader = () => {
     });
   }, [workbench]);
 
+  const [dense, setDense] = useState(false);
+
+  useGlobalEvent(
+    'scroll',
+    useCallback(() => {
+      if (!workspaceCardRef.current || !floatWorkspaceCardRef.current) return;
+      const inFlowTop = workspaceCardRef.current.getBoundingClientRect().top;
+      const floatTop =
+        floatWorkspaceCardRef.current.getBoundingClientRect().top;
+      setDense(inFlowTop <= floatTop);
+    }, [])
+  );
+
+  const openSetting = useCallback(() => {
+    globalDialogService.open('setting', {
+      activeTab: 'appearance',
+    });
+  }, [globalDialogService]);
+
   return (
-    <div className={clsx(styles.root, { dense })}>
-      <SafeArea top className={styles.float}>
-        <div className={styles.headerAndWsSelector}>
-          <div className={styles.wsSelectorWrapper}>
-            <WorkspaceSelector />
-          </div>
-          <div className={styles.settingWrapper}>
-            <IconButton
-              onClick={() => {
-                globalDialogService.open('setting', {
-                  activeTab: 'appearance',
-                });
-              }}
-              size="24"
-              style={{ padding: 10 }}
-              icon={<SettingsIcon />}
-            />
-          </div>
+    <>
+      <SafeArea top className={styles.root}>
+        <div className={styles.headerSettingRow}>
+          <IconButton onClick={openSetting} size={28} icon={<SettingsIcon />} />
         </div>
-        <div className={styles.searchWrapper}>
+        <div className={styles.wsSelectorAndSearch}>
+          <WorkspaceSelector ref={workspaceCardRef} />
           <SearchInput placeholder={t['Quick search']()} onClick={navSearch} />
         </div>
       </SafeArea>
-      <SafeArea top>
-        <div className={styles.space} />
+      {/* float */}
+      <SafeArea top className={clsx(styles.root, styles.float, { dense })}>
+        <WorkspaceSelector
+          className={styles.floatWsSelector}
+          ref={floatWorkspaceCardRef}
+        />
+        <IconButton
+          style={{ transition: 'none' }}
+          onClick={openSetting}
+          size={28}
+          icon={<SettingsIcon />}
+        />
       </SafeArea>
-    </div>
+    </>
   );
 };

packages/frontend/core/src/mobile/views/home-header/styles.css.ts

@@ -5,80 +5,48 @@ const headerHeight = createVar('headerHeight');
 const wsSelectorHeight = createVar('wsSelectorHeight');
 const searchHeight = createVar('searchHeight');
 
-const searchPadding = [10, 16, 15, 16];
-
 export const root = style({
   vars: {
     [headerHeight]: '44px',
     [wsSelectorHeight]: '48px',
     [searchHeight]: '44px',
   },
-  width: '100vw',
+  width: '100dvw',
 });
+export const headerSettingRow = style({
+  display: 'flex',
+  justifyContent: 'end',
+  height: 44,
+  paddingRight: 10,
+});
+export const wsSelectorAndSearch = style({
+  display: 'flex',
+  flexDirection: 'column',
+  gap: 15,
+  padding: '4px 16px 15px 16px',
+});
+
 export const float = style({
-  // why not 'sticky'?
-  // when height change, will affect scroll behavior, causing shaking
   position: 'fixed',
   top: 0,
   width: '100%',
   background: cssVarV2('layer/background/secondary'),
   zIndex: 1,
-});
-export const space = style({
-  height: `calc(${headerHeight} + ${wsSelectorHeight} + ${searchHeight} + ${searchPadding[0] + searchPadding[2]}px + 12px)`,
-});
 
-export const headerAndWsSelector = style({
   display: 'flex',
+  alignItems: 'center',
+  padding: '4px 10px 4px 16px',
   gap: 10,
-  alignItems: 'end',
-  transition: 'height 0.2s',
-  height: `calc(${headerHeight} + ${wsSelectorHeight})`,
 
+  // visibility control
+  visibility: 'hidden',
   selectors: {
-    [`${root}.dense &`]: {
-      height: wsSelectorHeight,
+    '&.dense': {
+      visibility: 'visible',
     },
   },
 });
-
-export const wsSelectorWrapper = style({
+export const floatWsSelector = style({
   width: 0,
   flex: 1,
-  height: wsSelectorHeight,
-  padding: '0 10px 0 16px',
-  display: 'flex',
-  alignItems: 'center',
-});
-
-export const settingWrapper = style({
-  width: '44px',
-  height: headerHeight,
-  transition: 'height 0.2s',
-
-  display: 'flex',
-  justifyContent: 'center',
-  alignItems: 'center',
-  alignSelf: 'start',
-
-  selectors: {
-    [`${root}.dense &`]: {
-      height: wsSelectorHeight,
-    },
-  },
-});
-
-export const searchWrapper = style({
-  padding: searchPadding.map(v => `${v}px`).join(' '),
-  width: '100%',
-  height: 44 + searchPadding[0] + searchPadding[2],
-  transition: 'all 0.2s',
-  overflow: 'hidden',
-  selectors: {
-    [`${root}.dense &`]: {
-      height: 0,
-      paddingTop: 0,
-      paddingBottom: 0,
-    },
-  },
 });