fix(core): optimize explorer's dnd behaviors (#7769)

close AF-1198, AF-1169, AF-1204, AF-1167, AF-1168

- **fix**: empty favorite cannot be dropped(AF-1198)
- **fix**: folder close animation has a unexpected delay
- **fix**: mount explorer's DropEffect to body to avoid clipping(AF-1169)
- **feat**: drop on empty organize to create folder and put item into it(AF-1204)
- **feat**: only show explorer section's action when hovered(AF-1168)
- **feat**: animate folder icon when opened(AF-1167)
- **chore**: extract dnd related `dropEffect`, `canDrop` functions outside component

packages/frontend/component/src/ui/lottie/folder-icon.json

@@ -2,7 +2,7 @@
   "v": "5.12.1",
   "fr": 60,
   "ip": 0,
-  "op": 89,
+  "op": 6,
   "w": 240,
   "h": 240,
   "nm": "folder",

packages/frontend/component/src/ui/lottie/folder-icon.tsx

@@ -7,25 +7,31 @@ import animationData from './folder-icon.json';
 import * as styles from './styles.css';
 
 export interface FolderIconProps {
-  closed: boolean; // eg, when folder icon is a "dragged over" state
+  open: boolean; // eg, when folder icon is a "dragged over" state
   className?: string;
+  speed?: number;
 }
 
 // animated folder icon that has two states: closed and opened
-export const AnimatedFolderIcon = ({ closed, className }: FolderIconProps) => {
+export const AnimatedFolderIcon = ({
+  open,
+  className,
+  speed = 0.5,
+}: FolderIconProps) => {
   const lottieRef: LottieRef = useRef(null);
 
   useEffect(() => {
     if (lottieRef.current) {
       const lottie = lottieRef.current;
-      if (closed) {
+      lottie.setSpeed(speed);
+      if (open) {
         lottie.setDirection(1);
       } else {
         lottie.setDirection(-1);
       }
       lottie.play();
     }
-  }, [closed]);
+  }, [open, speed]);
 
   return (
     <Lottie

packages/frontend/core/src/components/app-sidebar/category-divider/index.css.ts

@@ -2,10 +2,12 @@ import { cssVar } from '@toeverything/theme';
 import { cssVarV2 } from '@toeverything/theme/v2';
 import { style } from '@vanilla-extract/css';
 
-export const actions = style({
+const baseAction = style({
   display: 'flex',
   gap: 8,
+  opacity: 0,
 });
+
 export const root = style({
   fontSize: cssVar('fontXs'),
   height: 20,
@@ -23,11 +25,22 @@ export const root = style({
     [`&[data-collapsible="true"]:hover`]: {
       backgroundColor: cssVarV2('layer/background/hoverOverlay'),
     },
-    [`&[data-collapsible="true"]:hover:has(${actions}:hover)`]: {
+    [`&[data-collapsible="true"]:hover:has(${baseAction}:hover)`]: {
       backgroundColor: 'transparent',
     },
   },
 });
+
+export const actions = style([
+  baseAction,
+  {
+    selectors: {
+      [`${root}:hover &`]: {
+        opacity: 1,
+      },
+    },
+  },
+]);
 export const label = style({
   color: cssVarV2('text/tertiary'),
   fontWeight: 500,

packages/frontend/core/src/modules/explorer/views/layouts/collapsible-section.css.ts

@@ -1,6 +1,15 @@
+import { cssVarV2 } from '@toeverything/theme/v2';
 import { style } from '@vanilla-extract/css';
 
 export const root = style({});
 export const content = style({
   paddingTop: 6,
 });
+
+export const header = style({
+  selectors: {
+    '&[data-dragged-over="true"]': {
+      background: cssVarV2('layer/background/hoverOverlay'),
+    },
+  },
+});

packages/frontend/core/src/modules/explorer/views/layouts/collapsible-section.tsx

@@ -11,7 +11,7 @@ import {
 
 import { ExplorerService } from '../../services/explorer';
 import type { CollapsibleSectionName } from '../../types';
-import { content, root } from './collapsible-section.css';
+import { content, header, root } from './collapsible-section.css';
 
 interface CollapsibleSectionProps extends PropsWithChildren {
   name: CollapsibleSectionName;
@@ -67,7 +67,7 @@ export const CollapsibleSection = ({
         setCollapsed={setCollapsed}
         collapsed={collapsed}
         ref={headerRef}
-        className={headerClassName}
+        className={clsx(header, headerClassName)}
       >
         {actions}
       </CategoryDivider>

packages/frontend/core/src/modules/explorer/views/layouts/empty-section.css.ts

@@ -9,6 +9,13 @@ export const content = style({
   alignItems: 'center',
   gap: 4,
   padding: '12px 0px',
+  borderRadius: 8,
+  selectors: {
+    // assume that the section can be dragged over
+    '&[data-dragged-over="true"]': {
+      backgroundColor: cssVarV2('layer/background/hoverOverlay'),
+    },
+  },
 });
 export const iconWrapper = style({
   width: 36,

packages/frontend/core/src/modules/explorer/views/layouts/empty-section.tsx

@@ -1,8 +1,10 @@
 import { Button } from '@affine/component';
 import clsx from 'clsx';
 import {
+  cloneElement,
   forwardRef,
   type HTMLAttributes,
+  type ReactElement,
   type Ref,
   type SVGProps,
 } from 'react';
@@ -10,7 +12,7 @@ import {
 import * as styles from './empty-section.css';
 
 interface ExplorerEmptySectionProps extends HTMLAttributes<HTMLDivElement> {
-  icon: (props: SVGProps<SVGSVGElement>) => JSX.Element;
+  icon: ((props: SVGProps<SVGSVGElement>) => JSX.Element) | ReactElement;
   message: string;
   messageTestId?: string;
   actionText?: string;
@@ -30,11 +32,16 @@ export const ExplorerEmptySection = forwardRef(function ExplorerEmptySection(
   }: ExplorerEmptySectionProps,
   ref: Ref<HTMLDivElement>
 ) {
+  const icon =
+    typeof Icon === 'function' ? (
+      <Icon className={styles.icon} />
+    ) : (
+      cloneElement(Icon, { className: styles.icon })
+    );
+
   return (
     <div className={clsx(styles.content, className)} ref={ref} {...attrs}>
-      <div className={styles.iconWrapper}>
-        <Icon className={styles.icon} />
-      </div>
+      <div className={styles.iconWrapper}>{icon}</div>
       <div data-testid={messageTestId} className={styles.message}>
         {message}
       </div>

packages/frontend/core/src/modules/explorer/views/nodes/collection/index.tsx

@@ -31,11 +31,23 @@ import {
 import { useCallback, useEffect, useMemo, useState } from 'react';
 
 import { ExplorerTreeNode, type ExplorerTreeNodeDropEffect } from '../../tree';
+import type { ExplorerTreeNodeIcon } from '../../tree/node';
 import { ExplorerDocNode } from '../doc';
 import type { GenericExplorerNode } from '../types';
 import { Empty } from './empty';
 import { useExplorerCollectionNodeOperations } from './operations';
 
+const CollectionIcon: ExplorerTreeNodeIcon = ({
+  className,
+  draggedOver,
+  treeInstruction,
+}) => (
+  <AnimatedCollectionsIcon
+    className={className}
+    closed={!!draggedOver && treeInstruction?.type === 'make-child'}
+  />
+);
+
 export const ExplorerCollectionNode = ({
   collectionId,
   onDrop,
@@ -202,12 +214,7 @@ export const ExplorerCollectionNode = ({
   return (
     <>
       <ExplorerTreeNode
-        icon={({ draggedOver, className, treeInstruction }) => (
-          <AnimatedCollectionsIcon
-            className={className}
-            closed={!!draggedOver && treeInstruction?.type === 'make-child'}
-          />
-        )}
+        icon={CollectionIcon}
         name={collection.name || t['Untitled']()}
         dndData={dndData}
         onDrop={handleDropOnCollection}

packages/frontend/core/src/modules/explorer/views/nodes/folder/index.tsx

@@ -39,6 +39,7 @@ import { difference } from 'lodash-es';
 import { useCallback, useMemo, useState } from 'react';
 
 import { ExplorerTreeNode, type ExplorerTreeNodeDropEffect } from '../../tree';
+import type { ExplorerTreeNodeIcon } from '../../tree/node';
 import type { NodeOperation } from '../../tree/types';
 import { ExplorerCollectionNode } from '../collection';
 import { ExplorerDocNode } from '../doc';
@@ -150,6 +151,21 @@ export const ExplorerFolderNode = ({
   return;
 };
 
+// Define outside the `ExplorerFolderNodeFolder` to avoid re-render(the close animation won't play)
+const ExplorerFolderIcon: ExplorerTreeNodeIcon = ({
+  collapsed,
+  className,
+  draggedOver,
+  treeInstruction,
+}) => (
+  <AnimatedFolderIcon
+    className={className}
+    open={
+      !collapsed || (!!draggedOver && treeInstruction?.type === 'make-child')
+    }
+  />
+);
+
 export const ExplorerFolderNodeFolder = ({
   node,
   onDrop,
@@ -758,12 +774,7 @@ export const ExplorerFolderNodeFolder = ({
 
   return (
     <ExplorerTreeNode
-      icon={({ draggedOver, className, treeInstruction }) => (
-        <AnimatedFolderIcon
-          className={className}
-          closed={!!draggedOver && treeInstruction?.type === 'make-child'}
-        />
-      )}
+      icon={ExplorerFolderIcon}
       name={name}
       dndData={dndData}
       onDrop={handleDropOnFolder}

packages/frontend/core/src/modules/explorer/views/sections/favorites/dnd.ts

@@ -0,0 +1,45 @@
+import type { DropTargetOptions } from '@affine/component';
+import { isFavoriteSupportType } from '@affine/core/modules/favorite';
+import type { AffineDNDData } from '@affine/core/types/dnd';
+
+import type { ExplorerTreeNodeDropEffect } from '../../tree';
+
+export const favoriteChildrenDropEffect: ExplorerTreeNodeDropEffect = data => {
+  if (
+    data.treeInstruction?.type === 'reorder-above' ||
+    data.treeInstruction?.type === 'reorder-below'
+  ) {
+    if (
+      data.source.data.from?.at === 'explorer:favorite:list' &&
+      data.source.data.entity?.type &&
+      isFavoriteSupportType(data.source.data.entity.type)
+    ) {
+      return 'move';
+    } else if (
+      data.source.data.entity?.type &&
+      isFavoriteSupportType(data.source.data.entity.type)
+    ) {
+      return 'link';
+    }
+  }
+  return; // not supported
+};
+
+export const favoriteRootDropEffect: ExplorerTreeNodeDropEffect = data => {
+  const sourceType = data.source.data.entity?.type;
+  if (sourceType && isFavoriteSupportType(sourceType)) {
+    return 'link';
+  }
+  return;
+};
+
+export const favoriteRootCanDrop: DropTargetOptions<AffineDNDData>['canDrop'] =
+  data => {
+    return data.source.data.entity?.type
+      ? isFavoriteSupportType(data.source.data.entity.type)
+      : false;
+  };
+
+export const favoriteChildrenCanDrop: DropTargetOptions<AffineDNDData>['canDrop'] =
+  // Same as favoriteRootCanDrop
+  data => favoriteRootCanDrop(data);

packages/frontend/core/src/modules/explorer/views/sections/favorites/empty.tsx

@@ -1,6 +1,5 @@
 import {
   type DropTargetDropEvent,
-  type DropTargetOptions,
   Skeleton,
   useDropTarget,
 } from '@affine/component';
@@ -9,19 +8,18 @@ import { useI18n } from '@affine/i18n';
 import { FavoriteIcon } from '@blocksuite/icons/rc';
 
 import { ExplorerEmptySection } from '../../layouts/empty-section';
-import { DropEffect, type ExplorerTreeNodeDropEffect } from '../../tree';
+import { DropEffect } from '../../tree';
+import { favoriteRootCanDrop, favoriteRootDropEffect } from './dnd';
 
-export const RootEmpty = ({
-  onDrop,
-  canDrop,
-  isLoading,
-  dropEffect,
-}: {
+interface RootEmptyProps {
   onDrop?: (data: DropTargetDropEvent<AffineDNDData>) => void;
-  canDrop?: DropTargetOptions<AffineDNDData>['canDrop'];
-  dropEffect?: ExplorerTreeNodeDropEffect;
   isLoading?: boolean;
-}) => {
+}
+
+const RootEmptyLoading = () => {
+  return <Skeleton />;
+};
+const RootEmptyReady = ({ onDrop }: Omit<RootEmptyProps, 'isLoading'>) => {
   const t = useI18n();
 
   const { dropTargetRef, draggedOverDraggable, draggedOverPosition } =
@@ -31,15 +29,11 @@ export const RootEmpty = ({
           at: 'explorer:favorite:root',
         },
         onDrop: onDrop,
-        canDrop: canDrop,
+        canDrop: favoriteRootCanDrop,
       }),
-      [onDrop, canDrop]
+      [onDrop]
     );
 
-  if (isLoading) {
-    return <Skeleton />;
-  }
-
   return (
     <ExplorerEmptySection
       ref={dropTargetRef}
@@ -47,13 +41,10 @@ export const RootEmpty = ({
       message={t['com.affine.rootAppSidebar.favorites.empty']()}
       messageTestId="slider-bar-favorites-empty-message"
     >
-      {dropEffect && draggedOverDraggable && (
+      {draggedOverDraggable && (
         <DropEffect
-          position={{
-            x: draggedOverPosition.relativeX,
-            y: draggedOverPosition.relativeY,
-          }}
-          dropEffect={dropEffect({
+          position={draggedOverPosition}
+          dropEffect={favoriteRootDropEffect({
             source: draggedOverDraggable,
             treeInstruction: null,
           })}
@@ -62,3 +53,7 @@ export const RootEmpty = ({
     </ExplorerEmptySection>
   );
 };
+
+export const RootEmpty = ({ isLoading, ...props }: RootEmptyProps) => {
+  return isLoading ? <RootEmptyLoading /> : <RootEmptyReady {...props} />;
+};

packages/frontend/core/src/modules/explorer/views/sections/favorites/index.tsx

@@ -1,13 +1,11 @@
 import {
   type DropTargetDropEvent,
-  type DropTargetOptions,
   IconButton,
   useDropTarget,
 } from '@affine/component';
 import { track } from '@affine/core/mixpanel';
 import {
   DropEffect,
-  type ExplorerTreeNodeDropEffect,
   ExplorerTreeRoot,
 } from '@affine/core/modules/explorer/views/tree';
 import type { FavoriteSupportType } from '@affine/core/modules/favorite';
@@ -20,7 +18,7 @@ import type { AffineDNDData } from '@affine/core/types/dnd';
 import { useI18n } from '@affine/i18n';
 import { PlusIcon } from '@blocksuite/icons/rc';
 import { DocsService, useLiveData, useServices } from '@toeverything/infra';
-import { type MouseEventHandler, useCallback, useMemo } from 'react';
+import { type MouseEventHandler, useCallback } from 'react';
 
 import { ExplorerService } from '../../../services/explorer';
 import { CollapsibleSection } from '../../layouts/collapsible-section';
@@ -28,8 +26,13 @@ import { ExplorerCollectionNode } from '../../nodes/collection';
 import { ExplorerDocNode } from '../../nodes/doc';
 import { ExplorerFolderNode } from '../../nodes/folder';
 import { ExplorerTagNode } from '../../nodes/tag';
+import {
+  favoriteChildrenCanDrop,
+  favoriteChildrenDropEffect,
+  favoriteRootCanDrop,
+  favoriteRootDropEffect,
+} from './dnd';
 import { RootEmpty } from './empty';
-import * as styles from './styles.css';
 
 export const ExplorerFavorites = () => {
   const { favoriteService, docsService, workbenchService, explorerService } =
@@ -69,25 +72,6 @@ export const ExplorerFavorites = () => {
     [explorerSection, favoriteService.favoriteList]
   );
 
-  const handleDropEffect = useCallback<ExplorerTreeNodeDropEffect>(data => {
-    if (
-      data.source.data.entity?.type &&
-      isFavoriteSupportType(data.source.data.entity.type)
-    ) {
-      return 'link';
-    }
-    return;
-  }, []);
-
-  const handleCanDrop = useMemo<DropTargetOptions<AffineDNDData>['canDrop']>(
-    () => data => {
-      return data.source.data.entity?.type
-        ? isFavoriteSupportType(data.source.data.entity.type)
-        : false;
-    },
-    []
-  );
-
   const handleCreateNewFavoriteDoc: MouseEventHandler = useCallback(
     e => {
       const newDoc = docsService.createDoc();
@@ -163,40 +147,6 @@ export const ExplorerFavorites = () => {
     [favoriteService]
   );
 
-  const handleChildrenDropEffect = useCallback<ExplorerTreeNodeDropEffect>(
-    data => {
-      if (
-        data.treeInstruction?.type === 'reorder-above' ||
-        data.treeInstruction?.type === 'reorder-below'
-      ) {
-        if (
-          data.source.data.from?.at === 'explorer:favorite:list' &&
-          data.source.data.entity?.type &&
-          isFavoriteSupportType(data.source.data.entity.type)
-        ) {
-          return 'move';
-        } else if (
-          data.source.data.entity?.type &&
-          isFavoriteSupportType(data.source.data.entity.type)
-        ) {
-          return 'link';
-        }
-      }
-      return; // not supported
-    },
-    []
-  );
-
-  const handleChildrenCanDrop = useMemo<
-    DropTargetOptions<AffineDNDData>['canDrop']
-  >(
-    () => args =>
-      args.source.data.entity?.type
-        ? isFavoriteSupportType(args.source.data.entity.type)
-        : false,
-    []
-  );
-
   const { dropTargetRef, draggedOverDraggable, draggedOverPosition } =
     useDropTarget<AffineDNDData>(
       () => ({
@@ -204,9 +154,9 @@ export const ExplorerFavorites = () => {
           at: 'explorer:favorite:root',
         },
         onDrop: handleDrop,
-        canDrop: handleCanDrop,
+        canDrop: favoriteRootCanDrop,
       }),
-      [handleCanDrop, handleDrop]
+      [handleDrop]
     );
 
   return (
@@ -216,7 +166,6 @@ export const ExplorerFavorites = () => {
       headerRef={dropTargetRef}
       testId="explorer-favorites"
       headerTestId="explorer-favorite-category-divider"
-      headerClassName={styles.draggedOverHighlight}
       actions={
         <>
           <IconButton
@@ -233,11 +182,8 @@ export const ExplorerFavorites = () => {
           </IconButton>
           {draggedOverDraggable && (
             <DropEffect
-              position={{
-                x: draggedOverPosition.relativeX,
-                y: draggedOverPosition.relativeY,
-              }}
-              dropEffect={handleDropEffect({
+              position={draggedOverPosition}
+              dropEffect={favoriteRootDropEffect({
                 source: draggedOverDraggable,
                 treeInstruction: null,
               })}
@@ -247,22 +193,13 @@ export const ExplorerFavorites = () => {
       }
     >
       <ExplorerTreeRoot
-        placeholder={
-          <RootEmpty
-            onDrop={handleDrop}
-            canDrop={handleCanDrop}
-            dropEffect={handleDropEffect}
-            isLoading={isLoading}
-          />
-        }
+        placeholder={<RootEmpty onDrop={handleDrop} isLoading={isLoading} />}
       >
         {favorites.map(favorite => (
           <ExplorerFavoriteNode
             key={favorite.id}
             favorite={favorite}
             onDrop={handleOnChildrenDrop}
-            dropEffect={handleChildrenDropEffect}
-            canDrop={handleChildrenCanDrop}
           />
         ))}
       </ExplorerTreeRoot>
@@ -276,14 +213,11 @@ const childLocation = {
 const ExplorerFavoriteNode = ({
   favorite,
   onDrop,
-  canDrop,
-  dropEffect,
 }: {
   favorite: {
     id: string;
     type: FavoriteSupportType;
   };
-  canDrop?: DropTargetOptions<AffineDNDData>['canDrop'];
   onDrop: (
     favorite: {
       id: string;
@@ -291,7 +225,6 @@ const ExplorerFavoriteNode = ({
     },
     data: DropTargetDropEvent<AffineDNDData>
   ) => void;
-  dropEffect: ExplorerTreeNodeDropEffect;
 }) => {
   const handleOnChildrenDrop = useCallback(
     (data: DropTargetDropEvent<AffineDNDData>) => {
@@ -305,8 +238,8 @@ const ExplorerFavoriteNode = ({
       docId={favorite.id}
       location={childLocation}
       onDrop={handleOnChildrenDrop}
-      dropEffect={dropEffect}
-      canDrop={canDrop}
+      dropEffect={favoriteChildrenDropEffect}
+      canDrop={favoriteChildrenCanDrop}
     />
   ) : favorite.type === 'tag' ? (
     <ExplorerTagNode
@@ -314,8 +247,8 @@ const ExplorerFavoriteNode = ({
       tagId={favorite.id}
       location={childLocation}
       onDrop={handleOnChildrenDrop}
-      dropEffect={dropEffect}
-      canDrop={canDrop}
+      dropEffect={favoriteChildrenDropEffect}
+      canDrop={favoriteChildrenCanDrop}
     />
   ) : favorite.type === 'folder' ? (
     <ExplorerFolderNode
@@ -323,8 +256,8 @@ const ExplorerFavoriteNode = ({
       nodeId={favorite.id}
       location={childLocation}
       onDrop={handleOnChildrenDrop}
-      dropEffect={dropEffect}
-      canDrop={canDrop}
+      dropEffect={favoriteChildrenDropEffect}
+      canDrop={favoriteChildrenCanDrop}
     />
   ) : (
     <ExplorerCollectionNode
@@ -332,8 +265,8 @@ const ExplorerFavoriteNode = ({
       collectionId={favorite.id}
       location={childLocation}
       onDrop={handleOnChildrenDrop}
-      dropEffect={dropEffect}
-      canDrop={canDrop}
+      dropEffect={favoriteChildrenDropEffect}
+      canDrop={favoriteChildrenCanDrop}
     />
   );
 };

packages/frontend/core/src/modules/explorer/views/sections/favorites/styles.css.ts

@@ -1,12 +0,0 @@
-import { cssVar } from '@toeverything/theme';
-import { style } from '@vanilla-extract/css';
-
-export const draggedOverHighlight = style({
-  position: 'relative',
-  selectors: {
-    '&[data-dragged-over="true"]': {
-      background: cssVar('--affine-hover-color'),
-      borderRadius: '4px',
-    },
-  },
-});

packages/frontend/core/src/modules/explorer/views/sections/organize/dnd.ts

@@ -0,0 +1,36 @@
+import type { DropTargetOptions } from '@affine/component';
+import { isOrganizeSupportType } from '@affine/core/modules/organize/constants';
+import type { AffineDNDData } from '@affine/core/types/dnd';
+
+import type { ExplorerTreeNodeDropEffect } from '../../tree';
+
+export const organizeChildrenDropEffect: ExplorerTreeNodeDropEffect = data => {
+  if (
+    data.treeInstruction?.type === 'reorder-above' ||
+    data.treeInstruction?.type === 'reorder-below'
+  ) {
+    if (data.source.data.entity?.type === 'folder') {
+      return 'move';
+    }
+  } else {
+    return; // not supported
+  }
+  return;
+};
+
+export const organizeEmptyDropEffect: ExplorerTreeNodeDropEffect = data => {
+  const sourceType = data.source.data.entity?.type;
+  if (sourceType && isOrganizeSupportType(sourceType)) {
+    return 'link';
+  }
+  return;
+};
+
+/**
+ * Check whether the data can be dropped on the empty state of the organize section
+ */
+export const organizeEmptyRootCanDrop: DropTargetOptions<AffineDNDData>['canDrop'] =
+  data => {
+    const type = data.source.data.entity?.type;
+    return !!type && isOrganizeSupportType(type);
+  };

packages/frontend/core/src/modules/explorer/views/sections/organize/empty.tsx

@@ -1,31 +1,66 @@
-import { Skeleton } from '@affine/component';
+import {
+  AnimatedFolderIcon,
+  type DropTargetDropEvent,
+  Skeleton,
+  useDropTarget,
+} from '@affine/component';
+import type { AffineDNDData } from '@affine/core/types/dnd';
 import { useI18n } from '@affine/i18n';
-import { FolderIcon } from '@blocksuite/icons/rc';
 
 import { ExplorerEmptySection } from '../../layouts/empty-section';
+import { DropEffect } from '../../tree';
+import { organizeEmptyDropEffect, organizeEmptyRootCanDrop } from './dnd';
 
-export const RootEmpty = ({
-  onClickCreate,
-  isLoading,
-}: {
+interface RootEmptyProps {
   onClickCreate?: () => void;
   isLoading?: boolean;
-}) => {
+  onDrop?: (data: DropTargetDropEvent<AffineDNDData>) => void;
+}
+
+export const RootEmptyLoading = () => {
+  return <Skeleton />;
+};
+
+export const RootEmptyReady = ({
+  onClickCreate,
+  onDrop,
+}: Omit<RootEmptyProps, 'isLoading'>) => {
   const t = useI18n();
 
-  if (isLoading) {
-    return <Skeleton />;
-  }
+  const { dropTargetRef, draggedOverDraggable, draggedOverPosition } =
+    useDropTarget<AffineDNDData>(
+      () => ({
+        data: { at: 'explorer:organize:root' },
+        onDrop,
+        canDrop: organizeEmptyRootCanDrop,
+      }),
+      [onDrop]
+    );
 
   return (
     <ExplorerEmptySection
-      icon={FolderIcon}
+      ref={dropTargetRef}
+      icon={<AnimatedFolderIcon open={!!draggedOverDraggable} />}
       message={t['com.affine.rootAppSidebar.organize.empty']()}
       messageTestId="slider-bar-organize-empty-message"
       actionText={t[
         'com.affine.rootAppSidebar.organize.empty.new-folders-button'
       ]()}
       onActionClick={onClickCreate}
-    />
+    >
+      {draggedOverDraggable && (
+        <DropEffect
+          position={draggedOverPosition}
+          dropEffect={organizeEmptyDropEffect({
+            source: draggedOverDraggable,
+            treeInstruction: null,
+          })}
+        />
+      )}
+    </ExplorerEmptySection>
   );
 };
+
+export const RootEmpty = ({ isLoading, ...props }: RootEmptyProps) => {
+  return isLoading ? <RootEmptyLoading /> : <RootEmptyReady {...props} />;
+};

packages/frontend/core/src/modules/explorer/views/sections/organize/index.tsx

@@ -5,10 +5,7 @@ import {
   toast,
 } from '@affine/component';
 import { track } from '@affine/core/mixpanel';
-import {
-  type ExplorerTreeNodeDropEffect,
-  ExplorerTreeRoot,
-} from '@affine/core/modules/explorer/views/tree';
+import { ExplorerTreeRoot } from '@affine/core/modules/explorer/views/tree';
 import {
   type FolderNode,
   OrganizeService,
@@ -22,8 +19,8 @@ import { useCallback, useEffect, useMemo, useState } from 'react';
 import { ExplorerService } from '../../../services/explorer';
 import { CollapsibleSection } from '../../layouts/collapsible-section';
 import { ExplorerFolderNode } from '../../nodes/folder';
+import { organizeChildrenDropEffect } from './dnd';
 import { RootEmpty } from './empty';
-import * as styles from './styles.css';
 
 export const ExplorerOrganize = () => {
   const { organizeService, explorerService } = useServices({
@@ -36,10 +33,11 @@ export const ExplorerOrganize = () => {
 
   const t = useI18n();
 
-  const rootFolder = organizeService.folderTree.rootFolder;
+  const folderTree = organizeService.folderTree;
+  const rootFolder = folderTree.rootFolder;
 
   const folders = useLiveData(rootFolder.sortedChildren$);
-  const isLoading = useLiveData(organizeService.folderTree.isLoading$);
+  const isLoading = useLiveData(folderTree.isLoading$);
 
   const handleCreateFolder = useCallback(() => {
     const newFolderId = rootFolder.createFolder(
@@ -49,6 +47,7 @@ export const ExplorerOrganize = () => {
     track.$.navigationPanel.organize.createOrganizeItem({ type: 'folder' });
     setNewFolderId(newFolderId);
     explorerSection.setCollapsed(false);
+    return newFolderId;
   }, [explorerSection, rootFolder]);
 
   const handleOnChildrenDrop = useCallback(
@@ -78,21 +77,22 @@ export const ExplorerOrganize = () => {
     [rootFolder, t]
   );
 
-  const handleChildrenDropEffect = useCallback<ExplorerTreeNodeDropEffect>(
-    data => {
-      if (
-        data.treeInstruction?.type === 'reorder-above' ||
-        data.treeInstruction?.type === 'reorder-below'
-      ) {
-        if (data.source.data.entity?.type === 'folder') {
-          return 'move';
-        }
-      } else {
-        return; // not supported
-      }
-      return;
+  const createFolderAndDrop = useCallback(
+    (data: DropTargetDropEvent<AffineDNDData>) => {
+      const newFolderId = handleCreateFolder();
+      setNewFolderId(null);
+      const newFolder$ = folderTree.folderNode$(newFolderId);
+
+      const entity = data.source.data.entity;
+      if (!entity) return;
+      const { type, id } = entity;
+      if (type === 'folder') return;
+
+      const folder = newFolder$.value;
+      if (!folder) return;
+      folder.createLink(type, id, folder.indexAt('after'));
     },
-    []
+    [folderTree, handleCreateFolder]
   );
 
   const handleChildrenCanDrop = useMemo<
@@ -106,7 +106,6 @@ export const ExplorerOrganize = () => {
   return (
     <CollapsibleSection
       name="organize"
-      headerClassName={styles.draggedOverHighlight}
       title={t['com.affine.rootAppSidebar.organize']()}
       actions={
         <IconButton
@@ -123,7 +122,11 @@ export const ExplorerOrganize = () => {
     >
       <ExplorerTreeRoot
         placeholder={
-          <RootEmpty onClickCreate={handleCreateFolder} isLoading={isLoading} />
+          <RootEmpty
+            onClickCreate={handleCreateFolder}
+            isLoading={isLoading}
+            onDrop={createFolderAndDrop}
+          />
         }
       >
         {folders.map(child => (
@@ -132,7 +135,7 @@ export const ExplorerOrganize = () => {
             nodeId={child.id as string}
             defaultRenaming={child.id === newFolderId}
             onDrop={handleOnChildrenDrop}
-            dropEffect={handleChildrenDropEffect}
+            dropEffect={organizeChildrenDropEffect}
             canDrop={handleChildrenCanDrop}
             location={{
               at: 'explorer:organize:folder-node',

packages/frontend/core/src/modules/explorer/views/sections/organize/styles.css.ts

@@ -1,11 +0,0 @@
-import { cssVar } from '@toeverything/theme';
-import { style } from '@vanilla-extract/css';
-
-export const draggedOverHighlight = style({
-  selectors: {
-    '&[data-dragged-over="true"]': {
-      background: cssVar('--affine-hover-color'),
-      borderRadius: '4px',
-    },
-  },
-});

packages/frontend/core/src/modules/explorer/views/tree/drop-effect.css.ts

@@ -3,10 +3,9 @@ import { style } from '@vanilla-extract/css';
 
 export const dropEffect = style({
   zIndex: 99999,
-  position: 'absolute',
-  left: '0px',
-  top: '-34px',
-  opacity: 0.9,
+  position: 'fixed',
+  left: '10px',
+  top: '-20px',
   background: cssVar('--affine-background-primary-color'),
   boxShadow: cssVar('--affine-toolbar-shadow'),
   padding: '0px 4px',

packages/frontend/core/src/modules/explorer/views/tree/drop-effect.tsx

@@ -1,5 +1,7 @@
+import type { useDropTarget } from '@affine/component';
 import { useI18n } from '@affine/i18n';
 import { CopyIcon, LinkIcon, MoveToIcon } from '@blocksuite/icons/rc';
+import { createPortal } from 'react-dom';
 
 import * as styles from './drop-effect.css';
 
@@ -8,15 +10,15 @@ export const DropEffect = ({
   position,
 }: {
   dropEffect?: 'copy' | 'move' | 'link' | undefined;
-  position: { x: number; y: number };
+  position: ReturnType<typeof useDropTarget>['draggedOverPosition'];
 }) => {
   const t = useI18n();
   if (dropEffect === undefined) return null;
-  return (
+  return createPortal(
     <div
       className={styles.dropEffect}
       style={{
-        transform: `translate(${position.x + 10}px, ${position.y + 10}px)`,
+        transform: `translate(${position.clientX}px, ${position.clientY}px)`,
       }}
     >
       {dropEffect === 'copy' ? (
@@ -31,6 +33,7 @@ export const DropEffect = ({
         : dropEffect === 'move'
           ? t['com.affine.rootAppSidebar.explorer.drop-effect.move']()
           : t['com.affine.rootAppSidebar.explorer.drop-effect.link']()}
-    </div>
+    </div>,
+    document.body
   );
 };

packages/frontend/core/src/modules/explorer/views/tree/node.tsx

@@ -47,6 +47,12 @@ export type ExplorerTreeNodeDropEffectData = {
 export type ExplorerTreeNodeDropEffect = (
   data: ExplorerTreeNodeDropEffectData
 ) => 'copy' | 'move' | 'link' | undefined;
+export type ExplorerTreeNodeIcon = React.ComponentType<{
+  className?: string;
+  draggedOver?: boolean;
+  treeInstruction?: DropTargetTreeInstruction | null;
+  collapsed?: boolean;
+}>;
 
 export const ExplorerTreeNode = ({
   children,
@@ -74,11 +80,7 @@ export const ExplorerTreeNode = ({
   ...otherProps
 }: {
   name?: string;
-  icon?: React.ComponentType<{
-    className?: string;
-    draggedOver?: boolean;
-    treeInstruction?: DropTargetTreeInstruction | null;
-  }>;
+  icon?: ExplorerTreeNodeIcon;
   children?: React.ReactNode;
   active?: boolean;
   reorderable?: boolean;
@@ -311,6 +313,7 @@ export const ExplorerTreeNode = ({
             className={styles.icon}
             draggedOver={draggedOver && !isSelfDraggedOver}
             treeInstruction={treeInstruction}
+            collapsed={collapsed}
           />
         </div>
       )}
@@ -398,10 +401,7 @@ export const ExplorerTreeNode = ({
                 source: draggedOverDraggable,
                 treeInstruction: treeInstruction,
               })}
-              position={{
-                x: draggedOverPosition.relativeX,
-                y: draggedOverPosition.relativeY,
-              }}
+              position={draggedOverPosition}
             />
           )}
       </div>

packages/frontend/core/src/modules/organize/constants.ts

@@ -0,0 +1,12 @@
+export const OrganizeSupportType = [
+  'folder',
+  'doc',
+  'collection',
+  'tag',
+] as const;
+export type OrganizeSupportType = 'folder' | 'doc' | 'collection' | 'tag';
+
+export const isOrganizeSupportType = (
+  type: string
+): type is OrganizeSupportType =>
+  OrganizeSupportType.includes(type as OrganizeSupportType);