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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | import { AiHydroMessage } from "@shared/ExtensionMessage"
import debounce from "debounce"
import { useCallback, useEffect, useMemo, useRef, useState } from "react"
import { useEvent } from "react-use"
import { VirtuosoHandle } from "react-virtuoso"
import { ScrollBehavior } from "../types/chatTypes"
/**
* Custom hook for managing scroll behavior
* Handles auto-scrolling, manual scrolling, and scroll-to-message functionality
*/
export function useScrollBehavior(
messages: AiHydroMessage[],
visibleMessages: AiHydroMessage[],
groupedMessages: (AiHydroMessage | AiHydroMessage[])[],
expandedRows: Record<number, boolean>,
setExpandedRows: React.Dispatch<React.SetStateAction<Record<number, boolean>>>,
): ScrollBehavior & {
showScrollToBottom: boolean
setShowScrollToBottom: React.Dispatch<React.SetStateAction<boolean>>
isAtBottom: boolean
setIsAtBottom: React.Dispatch<React.SetStateAction<boolean>>
pendingScrollToMessage: number | null
setPendingScrollToMessage: React.Dispatch<React.SetStateAction<number | null>>
} {
// Refs
const virtuosoRef = useRef<VirtuosoHandle>(null)
const scrollContainerRef = useRef<HTMLDivElement>(null)
const disableAutoScrollRef = useRef(false)
// State
const [showScrollToBottom, setShowScrollToBottom] = useState(false)
const [isAtBottom, setIsAtBottom] = useState(false)
const [pendingScrollToMessage, setPendingScrollToMessage] = useState<number | null>(null)
const scrollToBottomSmooth = useMemo(
() =>
debounce(
() => {
virtuosoRef.current?.scrollTo({
top: Number.MAX_SAFE_INTEGER,
behavior: "smooth",
})
},
10,
{ immediate: true },
),
[],
)
// Smooth scroll to bottom with debounce
const scrollToBottomAuto = useCallback(() => {
virtuosoRef.current?.scrollTo({
top: Number.MAX_SAFE_INTEGER,
behavior: "auto", // instant causes crash
})
}, [])
const scrollToMessage = useCallback(
(messageIndex: number) => {
setPendingScrollToMessage(messageIndex)
const targetMessage = messages[messageIndex]
if (!targetMessage) {
setPendingScrollToMessage(null)
return
}
const visibleIndex = visibleMessages.findIndex((msg) => msg.ts === targetMessage.ts)
if (visibleIndex === -1) {
setPendingScrollToMessage(null)
return
}
let groupIndex = -1
for (let i = 0; i < groupedMessages.length; i++) {
const group = groupedMessages[i]
if (Array.isArray(group)) {
const messageInGroup = group.some((msg) => msg.ts === targetMessage.ts)
if (messageInGroup) {
groupIndex = i
break
}
} else {
if (group.ts === targetMessage.ts) {
groupIndex = i
break
}
}
}
if (groupIndex !== -1) {
setPendingScrollToMessage(null)
disableAutoScrollRef.current = true
requestAnimationFrame(() => {
requestAnimationFrame(() => {
virtuosoRef.current?.scrollToIndex({
index: groupIndex,
align: "start",
behavior: "smooth",
})
})
})
}
},
[messages, visibleMessages, groupedMessages],
)
// scroll when user toggles certain rows
const toggleRowExpansion = useCallback(
(ts: number) => {
const isCollapsing = expandedRows[ts] ?? false
const lastGroup = groupedMessages.at(-1)
const isLast = Array.isArray(lastGroup) ? lastGroup[0].ts === ts : lastGroup?.ts === ts
const secondToLastGroup = groupedMessages.at(-2)
const isSecondToLast = Array.isArray(secondToLastGroup)
? secondToLastGroup[0].ts === ts
: secondToLastGroup?.ts === ts
const isLastCollapsedApiReq =
isLast &&
!Array.isArray(lastGroup) && // Make sure it's not a browser session group
lastGroup?.say === "api_req_started" &&
!expandedRows[lastGroup.ts]
setExpandedRows((prev) => ({
...prev,
[ts]: !prev[ts],
}))
// disable auto scroll when user expands row
if (!isCollapsing) {
disableAutoScrollRef.current = true
}
if (isCollapsing && isAtBottom) {
const timer = setTimeout(() => {
scrollToBottomAuto()
}, 0)
return () => clearTimeout(timer)
} else if (isLast || isSecondToLast) {
if (isCollapsing) {
if (isSecondToLast && !isLastCollapsedApiReq) {
return
}
const timer = setTimeout(() => {
scrollToBottomAuto()
}, 0)
return () => clearTimeout(timer)
} else {
const timer = setTimeout(() => {
virtuosoRef.current?.scrollToIndex({
index: groupedMessages.length - (isLast ? 1 : 2),
align: "start",
})
}, 0)
return () => clearTimeout(timer)
}
}
},
[groupedMessages, expandedRows, scrollToBottomAuto, isAtBottom],
)
const handleRowHeightChange = useCallback(
(isTaller: boolean) => {
if (!disableAutoScrollRef.current) {
if (isTaller) {
scrollToBottomSmooth()
} else {
setTimeout(() => {
scrollToBottomAuto()
}, 0)
}
}
},
[scrollToBottomSmooth, scrollToBottomAuto],
)
useEffect(() => {
if (!disableAutoScrollRef.current) {
setTimeout(() => {
scrollToBottomSmooth()
}, 50)
// return () => clearTimeout(timer) // dont cleanup since if visibleMessages.length changes it cancels.
}
}, [groupedMessages.length, scrollToBottomSmooth])
useEffect(() => {
if (pendingScrollToMessage !== null) {
scrollToMessage(pendingScrollToMessage)
}
}, [pendingScrollToMessage, groupedMessages, scrollToMessage])
useEffect(() => {
if (!messages?.length) {
setShowScrollToBottom(false)
}
}, [messages.length])
const handleWheel = useCallback((event: Event) => {
const wheelEvent = event as WheelEvent
if (wheelEvent.deltaY && wheelEvent.deltaY < 0) {
if (scrollContainerRef.current?.contains(wheelEvent.target as Node)) {
// user scrolled up
disableAutoScrollRef.current = true
}
}
}, [])
useEvent("wheel", handleWheel, window, { passive: true }) // passive improves scrolling performance
return {
virtuosoRef,
scrollContainerRef,
disableAutoScrollRef,
scrollToBottomSmooth,
scrollToBottomAuto,
scrollToMessage,
toggleRowExpansion,
handleRowHeightChange,
showScrollToBottom,
setShowScrollToBottom,
isAtBottom,
setIsAtBottom,
pendingScrollToMessage,
setPendingScrollToMessage,
}
}
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