From 0f37a4591b604fa51f5642ee69b59cc96522a478 Mon Sep 17 00:00:00 2001
From: Doug MacKenzie <doug.mackenzie@cultureamp.com>
Date: Wed, 4 Dec 2024 14:02:42 +1100
Subject: [PATCH] Tabs (future): add carousel functionality when tabs overflow
 container

---
 .changeset/thin-actors-knock.md               |  5 +
 .../__future__/Tabs/subcomponents/Tab/Tab.tsx |  2 +-
 .../subcomponents/TabList/TabList.module.css  | 41 +++++++-
 .../Tabs/subcomponents/TabList/TabList.tsx    | 99 +++++++++++++++++--
 4 files changed, 137 insertions(+), 10 deletions(-)
 create mode 100644 .changeset/thin-actors-knock.md

diff --git a/.changeset/thin-actors-knock.md b/.changeset/thin-actors-knock.md
new file mode 100644
index 00000000000..37f56f49323
--- /dev/null
+++ b/.changeset/thin-actors-knock.md
@@ -0,0 +1,5 @@
+---
+'@kaizen/components': patch
+---
+
+Tabs (future): add carousel functionality when tabs overflow container width
diff --git a/packages/components/src/__future__/Tabs/subcomponents/Tab/Tab.tsx b/packages/components/src/__future__/Tabs/subcomponents/Tab/Tab.tsx
index e522ccf2cd9..4a16e6b7b3d 100644
--- a/packages/components/src/__future__/Tabs/subcomponents/Tab/Tab.tsx
+++ b/packages/components/src/__future__/Tabs/subcomponents/Tab/Tab.tsx
@@ -28,7 +28,7 @@ export const Tab = (props: TabProps): JSX.Element => {
   }
 
   return (
-    <RACTab {...tabProps}>
+    <RACTab data-kz-tab {...tabProps}>
       {({ isSelected, isFocusVisible, isHovered }) => (
         <>
           {children}
diff --git a/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.module.css b/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.module.css
index dc9cad7ca7e..9d918d3837a 100644
--- a/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.module.css
+++ b/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.module.css
@@ -1,8 +1,47 @@
+.container {
+  position: relative;
+}
+
 .tabList {
   border-bottom: 1px solid rgba(var(--color-gray-600-rgb), 0.1);
-  padding: var(--spacing-xs) var(--spacing-md) 0;
+  padding: var(--spacing-xs) 0 0;
+  width: 100%;
+  height: 100%;
+  overflow-x: scroll;
+  white-space: nowrap;
+  scrollbar-width: none;
+  scroll-behavior: smooth;
 }
 
 .noPadding {
   padding: 0;
 }
+
+.leftArrow,
+.rightArrow {
+  --button-bg-color: var(--color-white);
+
+  position: absolute;
+  z-index: 10000;
+  inset-block: 0 1px;
+  border-radius: 0;
+  width: 48px;
+}
+
+.leftArrow {
+  inset-inline-start: 0;
+}
+
+.leftArrow,
+.leftArrow:hover {
+  border-inline-end: 1px solid rgba(var(--color-gray-600-rgb), 0.1);
+}
+
+.rightArrow {
+  inset-inline-end: 0;
+}
+
+.rightArrow,
+.rightArrow:hover {
+  border-inline-start: 1px solid rgba(var(--color-gray-600-rgb), 0.1);
+}
diff --git a/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.tsx b/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.tsx
index 274a08b752b..12af22b35bc 100644
--- a/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.tsx
+++ b/packages/components/src/__future__/Tabs/subcomponents/TabList/TabList.tsx
@@ -1,7 +1,10 @@
-import React, { ReactNode } from 'react'
+import React, { ReactNode, useEffect, useRef, useState } from 'react'
 import classnames from 'classnames'
 import { TabList as RACTabList, TabListProps as RACTabListProps } from 'react-aria-components'
+import { Button } from '~components/__actions__/v3'
+import { Icon } from '~components/__future__/Icon'
 import styles from './TabList.module.css'
+import { Button as RACButton } from 'react-aria-components'
 
 export type TabListProps = {
   /**
@@ -20,13 +23,93 @@ export type TabListProps = {
  */
 export const TabList = (props: TabListProps): JSX.Element => {
   const { 'aria-label': ariaLabel, noPadding = false, children, className, ...restProps } = props
+  const [isDocumentReady, setIsDocumentReady] = useState<boolean>(false)
+  const [leftArrowEnabled, setLeftArrowEnabled] = useState<boolean>(false)
+  const [rightArrowEnabled, setRightArrowEnabled] = useState<boolean>(false)
+
+  useEffect(() => {
+    if (!isDocumentReady) {
+      setIsDocumentReady(true)
+      return
+    }
+
+    const tabs = document.querySelectorAll('[data-kz-tab]')
+
+    const firstTabObserver = new IntersectionObserver(
+      (entries) => {
+        if (!entries[0].isIntersecting) {
+          setLeftArrowEnabled(true)
+          return
+        }
+        setLeftArrowEnabled(false)
+      },
+      {
+        threshold: 0.75,
+      },
+    )
+    firstTabObserver.observe(tabs[0])
+
+    const lastTabObserver = new IntersectionObserver(
+      (entries) => {
+        if (!entries[0].isIntersecting) {
+          setRightArrowEnabled(true)
+          return
+        }
+        setRightArrowEnabled(false)
+      },
+      {
+        threshold: 0.75,
+      },
+    )
+    lastTabObserver.observe(tabs[tabs.length - 1])
+  }, [isDocumentReady])
+
+  const tabListRef = useRef<HTMLDivElement | null>(null)
+
+  const handleArrowPress = (direction: 'left' | 'right'): void => {
+    if (tabListRef.current) {
+      const scrollAmount = 120
+      const tabListScrollPos = tabListRef.current.scrollLeft
+      const newSpot =
+        direction === 'left' ? tabListScrollPos - scrollAmount : tabListScrollPos + scrollAmount
+      tabListRef.current.scrollLeft = newSpot
+    }
+  }
+
   return (
-    <RACTabList
-      aria-label={ariaLabel}
-      className={classnames(styles.tabList, className, noPadding && styles.noPadding)}
-      {...restProps}
-    >
-      {children}
-    </RACTabList>
+    <div className={styles.container}>
+      {leftArrowEnabled && (
+        <Button
+          hasHiddenLabel
+          icon={<Icon name="chevron_left" isPresentational />}
+          onPress={() => handleArrowPress('left')}
+          variant="tertiary"
+          className={styles.leftArrow}
+          excludeFromTabOrder
+        >
+          Slide tab list left
+        </Button>
+      )}
+      <RACTabList
+        aria-label={ariaLabel}
+        ref={tabListRef}
+        className={classnames(styles.tabList, className, noPadding && styles.noPadding)}
+        {...restProps}
+      >
+        {children}
+      </RACTabList>
+      {rightArrowEnabled && (
+        <Button
+          hasHiddenLabel
+          icon={<Icon name="chevron_right" isPresentational />}
+          onPress={() => handleArrowPress('right')}
+          variant="tertiary"
+          className={styles.rightArrow}
+          excludeFromTabOrder
+        >
+          Slide tab list right
+        </Button>
+      )}
+    </div>
   )
 }