From e64a19a05a79dcd8e5c8f3910832a1a9dde610ff Mon Sep 17 00:00:00 2001
From: tangjinzhou <415800467@qq.com>
Date: Thu, 26 Jan 2023 10:13:10 +0800
Subject: [PATCH] refactor: backtop

---
 components/_util/type.ts                  |   4 +
 components/back-top/demo/custom.vue       |  11 +-
 components/back-top/index.tsx             |  31 +++---
 components/back-top/style/index.less      |  49 ---------
 components/back-top/style/index.ts        | 118 ++++++++++++++++++++++
 components/back-top/style/index.tsx       |   2 -
 components/back-top/style/responsive.less |  21 ----
 components/style.ts                       |   2 +-
 components/theme/interface/components.ts  |  26 ++---
 9 files changed, 159 insertions(+), 105 deletions(-)
 delete mode 100644 components/back-top/style/index.less
 create mode 100644 components/back-top/style/index.ts
 delete mode 100644 components/back-top/style/index.tsx
 delete mode 100644 components/back-top/style/responsive.less

diff --git a/components/_util/type.ts b/components/_util/type.ts
index ed35b21a2..b2e14f33a 100644
--- a/components/_util/type.ts
+++ b/components/_util/type.ts
@@ -42,3 +42,7 @@ export const withInstall = <T>(comp: T) => {
 };
 
 export type MaybeRef<T> = T | Ref<T>;
+
+export function eventType<T>() {
+  return { type: [Function, Array] as PropType<T | T[]> };
+}
diff --git a/components/back-top/demo/custom.vue b/components/back-top/demo/custom.vue
index da70dad3e..ae36a70aa 100644
--- a/components/back-top/demo/custom.vue
+++ b/components/back-top/demo/custom.vue
@@ -17,7 +17,7 @@ You can customize the style of the button, just note the size limit: no more tha
 
 <template>
   <div id="components-back-top-demo-custom">
-    <a-back-top>
+    <a-back-top @click="handleClick">
       <div class="ant-back-top-inner">UP</div>
     </a-back-top>
     Scroll down to see the bottom-right
@@ -25,10 +25,15 @@ You can customize the style of the button, just note the size limit: no more tha
     button.
   </div>
 </template>
+<script setup>
+const handleClick = () => {
+  console.log('click');
+};
+</script>
 
 <style scoped>
-#components-back-top-demo-custom .ant-back-top {
-  bottom: 100px;
+:deep(#components-back-top-demo-custom) .ant-back-top {
+  inset-block-end: 100px;
 }
 #components-back-top-demo-custom .ant-back-top-inner {
   height: 40px;
diff --git a/components/back-top/index.tsx b/components/back-top/index.tsx
index fd00085c3..bd39af8f4 100644
--- a/components/back-top/index.tsx
+++ b/components/back-top/index.tsx
@@ -11,21 +11,21 @@ import {
   onDeactivated,
 } from 'vue';
 import VerticalAlignTopOutlined from '@ant-design/icons-vue/VerticalAlignTopOutlined';
-import addEventListener from '../vc-util/Dom/addEventListener';
 import getScroll from '../_util/getScroll';
 import { getTransitionProps, Transition } from '../_util/transition';
 import scrollTo from '../_util/scrollTo';
-import { withInstall } from '../_util/type';
+import { withInstall, eventType } from '../_util/type';
 import throttleByAnimationFrame from '../_util/throttleByAnimationFrame';
 import useConfigInject from '../_util/hooks/useConfigInject';
 import type { MouseEventHandler } from '../_util/EventInterface';
+import useStyle from './style';
 
 export const backTopProps = () => ({
   visibilityHeight: { type: Number, default: 400 },
   duration: { type: Number, default: 450 },
   target: Function as PropType<() => HTMLElement | Window | Document>,
   prefixCls: String,
-  onClick: Function as PropType<MouseEventHandler>,
+  onClick: eventType<MouseEventHandler>(),
   // visible: { type: Boolean, default: undefined }, // Only for test. Don't use it.
 });
 
@@ -39,6 +39,7 @@ const BackTop = defineComponent({
   // emits: ['click'],
   setup(props, { slots, attrs, emit }) {
     const { prefixCls, direction } = useConfigInject('back-top', props);
+    const [wrapSSR, hashId] = useStyle(prefixCls);
     const domRef = ref();
     const state = reactive({
       visible: false,
@@ -60,26 +61,23 @@ const BackTop = defineComponent({
     const handleScroll = throttleByAnimationFrame((e: Event | { target: any }) => {
       const { visibilityHeight } = props;
       const scrollTop = getScroll(e.target, true);
-      state.visible = scrollTop > visibilityHeight;
+      state.visible = scrollTop >= visibilityHeight;
     });
 
     const bindScrollEvent = () => {
       const { target } = props;
       const getTarget = target || getDefaultTarget;
       const container = getTarget();
-      state.scrollEvent = addEventListener(container, 'scroll', (e: Event) => {
-        handleScroll(e);
-      });
-      handleScroll({
-        target: container,
-      });
+      handleScroll({ target: container });
+      container?.addEventListener('scroll', handleScroll);
     };
 
     const scrollRemove = () => {
-      if (state.scrollEvent) {
-        state.scrollEvent.remove();
-      }
-      (handleScroll as any).cancel();
+      const { target } = props;
+      const getTarget = target || getDefaultTarget;
+      const container = getTarget();
+      handleScroll.cancel();
+      container?.removeEventListener('scroll', handleScroll);
     };
 
     watch(
@@ -124,6 +122,7 @@ const BackTop = defineComponent({
         ...attrs,
         onClick: scrollToTop,
         class: {
+          [hashId.value]: true,
           [`${prefixCls.value}`]: true,
           [`${attrs.class}`]: attrs.class,
           [`${prefixCls.value}-rtl`]: direction.value === 'rtl',
@@ -131,12 +130,12 @@ const BackTop = defineComponent({
       };
 
       const transitionProps = getTransitionProps('fade');
-      return (
+      return wrapSSR(
         <Transition {...transitionProps}>
           <div v-show={state.visible} {...divProps} ref={domRef}>
             {slots.default?.() || defaultElement}
           </div>
-        </Transition>
+        </Transition>,
       );
     };
   },
diff --git a/components/back-top/style/index.less b/components/back-top/style/index.less
deleted file mode 100644
index 60a3da575..000000000
--- a/components/back-top/style/index.less
+++ /dev/null
@@ -1,49 +0,0 @@
-@import '../../style/themes/index';
-@import '../../style/mixins/index';
-
-@backtop-prefix-cls: ~'@{ant-prefix}-back-top';
-
-.@{backtop-prefix-cls} {
-  .reset-component();
-
-  position: fixed;
-  right: 100px;
-  bottom: 50px;
-  z-index: @zindex-back-top;
-  width: 40px;
-  height: 40px;
-  cursor: pointer;
-
-  &:empty {
-    display: none;
-  }
-
-  &-rtl {
-    right: auto;
-    left: 100px;
-    direction: rtl;
-  }
-
-  &-content {
-    width: 40px;
-    height: 40px;
-    overflow: hidden;
-    color: @back-top-color;
-    text-align: center;
-    background-color: @back-top-bg;
-    border-radius: 20px;
-    transition: all 0.3s;
-
-    &:hover {
-      background-color: @back-top-hover-bg;
-      transition: all 0.3s;
-    }
-  }
-
-  &-icon {
-    font-size: 24px;
-    line-height: 40px;
-  }
-}
-
-@import './responsive';
diff --git a/components/back-top/style/index.ts b/components/back-top/style/index.ts
new file mode 100644
index 000000000..545e5fc9d
--- /dev/null
+++ b/components/back-top/style/index.ts
@@ -0,0 +1,118 @@
+import type { CSSObject } from '../../_util/cssinjs';
+import type { FullToken, GenerateStyle } from '../../theme/internal';
+import { genComponentStyleHook, mergeToken } from '../../theme/internal';
+import { resetComponent } from '../../_style';
+
+/** Component only token. Which will handle additional calculation of alias token */
+export interface ComponentToken {
+  zIndexPopup: number;
+}
+
+type BackTopToken = FullToken<'BackTop'> & {
+  backTopBackground: string;
+  backTopColor: string;
+  backTopHoverBackground: string;
+  backTopFontSize: number;
+  backTopSize: number;
+
+  // Position
+  backTopBlockEnd: number;
+  backTopInlineEnd: number;
+  backTopInlineEndMD: number;
+  backTopInlineEndXS: number;
+};
+
+// ============================== Shared ==============================
+const genSharedBackTopStyle: GenerateStyle<BackTopToken, CSSObject> = (token): CSSObject => {
+  const { componentCls, backTopFontSize, backTopSize, zIndexPopup } = token;
+
+  return {
+    [componentCls]: {
+      ...resetComponent(token),
+
+      position: 'fixed',
+      insetInlineEnd: token.backTopInlineEnd,
+      insetBlockEnd: token.backTopBlockEnd,
+      zIndex: zIndexPopup,
+      width: 40,
+      height: 40,
+      cursor: 'pointer',
+
+      '&:empty': {
+        display: 'none',
+      },
+
+      [`${componentCls}-content`]: {
+        width: backTopSize,
+        height: backTopSize,
+        overflow: 'hidden',
+        color: token.backTopColor,
+        textAlign: 'center',
+        backgroundColor: token.backTopBackground,
+        borderRadius: backTopSize,
+        transition: `all ${token.motionDurationMid}`,
+
+        '&:hover': {
+          backgroundColor: token.backTopHoverBackground,
+          transition: `all ${token.motionDurationMid}`,
+        },
+      },
+
+      // change to .backtop .backtop-icon
+      [`${componentCls}-icon`]: {
+        fontSize: backTopFontSize,
+        lineHeight: `${backTopSize}px`,
+      },
+    },
+  };
+};
+
+const genMediaBackTopStyle: GenerateStyle<BackTopToken> = (token): CSSObject => {
+  const { componentCls } = token;
+
+  return {
+    [`@media (max-width: ${token.screenMD}px)`]: {
+      [componentCls]: {
+        insetInlineEnd: token.backTopInlineEndMD,
+      },
+    },
+
+    [`@media (max-width: ${token.screenXS}px)`]: {
+      [componentCls]: {
+        insetInlineEnd: token.backTopInlineEndXS,
+      },
+    },
+  };
+};
+
+// ============================== Export ==============================
+export default genComponentStyleHook<'BackTop'>(
+  'BackTop',
+
+  token => {
+    const {
+      fontSizeHeading3,
+      colorTextDescription,
+      colorTextLightSolid,
+      colorText,
+      controlHeightLG,
+    } = token;
+
+    const backTopToken = mergeToken<BackTopToken>(token, {
+      backTopBackground: colorTextDescription,
+      backTopColor: colorTextLightSolid,
+      backTopHoverBackground: colorText,
+      backTopFontSize: fontSizeHeading3,
+      backTopSize: controlHeightLG,
+
+      backTopBlockEnd: controlHeightLG * 1.25,
+      backTopInlineEnd: controlHeightLG * 2.5,
+      backTopInlineEndMD: controlHeightLG * 1.5,
+      backTopInlineEndXS: controlHeightLG * 0.5,
+    });
+    return [genSharedBackTopStyle(backTopToken), genMediaBackTopStyle(backTopToken)];
+  },
+  token => ({
+    zIndexPopup: token.zIndexBase + 10,
+  }),
+);
diff --git a/components/back-top/style/index.tsx b/components/back-top/style/index.tsx
deleted file mode 100644
index 3a3ab0de5..000000000
--- a/components/back-top/style/index.tsx
+++ /dev/null
@@ -1,2 +0,0 @@
-import '../../style/index.less';
-import './index.less';
diff --git a/components/back-top/style/responsive.less b/components/back-top/style/responsive.less
deleted file mode 100644
index 9d5da95b9..000000000
--- a/components/back-top/style/responsive.less
+++ /dev/null
@@ -1,21 +0,0 @@
-@media screen and (max-width: @screen-md) {
-  .@{backtop-prefix-cls} {
-    right: 60px;
-
-    &-rtl {
-      right: auto;
-      left: 60px;
-    }
-  }
-}
-
-@media screen and (max-width: @screen-xs) {
-  .@{backtop-prefix-cls} {
-    right: 20px;
-
-    &-rtl {
-      right: auto;
-      left: 20px;
-    }
-  }
-}
diff --git a/components/style.ts b/components/style.ts
index ce1d3f154..232f4eb7d 100644
--- a/components/style.ts
+++ b/components/style.ts
@@ -28,7 +28,7 @@ import './switch/style';
 import './auto-complete/style';
 // import './affix/style';
 import './cascader/style';
-import './back-top/style';
+// import './back-top/style';
 import './modal/style';
 // import './alert/style';
 import './time-picker/style';
diff --git a/components/theme/interface/components.ts b/components/theme/interface/components.ts
index fedf1ddeb..917c2886b 100644
--- a/components/theme/interface/components.ts
+++ b/components/theme/interface/components.ts
@@ -1,7 +1,7 @@
 import type { ComponentToken as AlertComponentToken } from '../../alert/style';
 import type { ComponentToken as AnchorComponentToken } from '../../anchor/style';
 import type { ComponentToken as AvatarComponentToken } from '../../avatar/style';
-// import type { ComponentToken as BackTopComponentToken } from '../../back-top/style';
+import type { ComponentToken as BackTopComponentToken } from '../../back-top/style';
 // import type { ComponentToken as ButtonComponentToken } from '../../button/style';
 // import type { ComponentToken as FloatButtonComponentToken } from '../../float-button/style';
 // import type { ComponentToken as CalendarComponentToken } from '../../calendar/style';
@@ -55,32 +55,32 @@ export interface ComponentTokenMap {
   Alert?: AlertComponentToken;
   Anchor?: AnchorComponentToken;
   Avatar?: AvatarComponentToken;
-  //   BackTop?: BackTopComponentToken;
-  //   Badge?: {};
+  BackTop?: BackTopComponentToken;
+  Badge?: {};
   //   Button?: ButtonComponentToken;
-  //   Breadcrumb?: {};
+  Breadcrumb?: {};
   //   Card?: CardComponentToken;
   //   Carousel?: CarouselComponentToken;
   //   Cascader?: CascaderComponentToken;
   //   Checkbox?: CheckboxComponentToken;
   //   Collapse?: CollapseComponentToken;
   //   DatePicker?: DatePickerComponentToken;
-  //   Descriptions?: {};
+  Descriptions?: {};
   //   Divider?: DividerComponentToken;
   //   Drawer?: DrawerComponentToken;
   //   Dropdown?: DropdownComponentToken;
   //   Empty?: EmptyComponentToken;
   //   FloatButton?: FloatButtonComponentToken;
-  //   Form?: {};
-  //   Grid?: {};
+  Form?: {};
+  Grid?: {};
   //   Image?: ImageComponentToken;
-  //   Input?: {};
+  Input?: {};
   //   InputNumber?: InputNumberComponentToken;
   //   Layout?: LayoutComponentToken;
   //   List?: ListComponentToken;
   //   Mentions?: MentionsComponentToken;
   //   Notification?: NotificationComponentToken;
-  //   Pagination?: {};
+  Pagination?: {};
   //   Popover?: PopoverComponentToken;
   //   Popconfirm?: PopconfirmComponentToken;
   //   Rate?: RateComponentToken;
@@ -91,11 +91,11 @@ export interface ComponentTokenMap {
   //   Skeleton?: SkeletonComponentToken;
   //   Slider?: SliderComponentToken;
   //   Spin?: SpinComponentToken;
-  //   Statistic?: {};
-  //   Switch?: {};
+  Statistic?: {};
+  Switch?: {};
   //   Tag?: TagComponentToken;
-  //   Tree?: {};
-  //   TreeSelect?: {};
+  Tree?: {};
+  TreeSelect?: {};
   //   Typography?: TypographyComponentToken;
   //   Timeline?: TimelineComponentToken;
   //   Transfer?: TransferComponentToken;