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| 1 | +import { useCallback, useEffect, useMemo, useState } from 'react' |
| 2 | +import { AnimatePresence, motion } from 'motion/react' |
| 3 | +import { useEmojiPicker } from '../contexts/EmojiPicker' |
| 4 | +import { CssVar } from '../types/Theme' |
| 5 | + |
| 6 | +interface Props { |
| 7 | + textareaRef: React.RefObject<HTMLTextAreaElement | null> |
| 8 | + text: string |
| 9 | + setText: (text: string) => void |
| 10 | + updateEmojiDict: React.Dispatch<React.SetStateAction<Record<string, { imageURL: string }>>> |
| 11 | +} |
| 12 | + |
| 13 | +export const EmojiSuggestion = ({ textareaRef, text, setText, updateEmojiDict }: Props) => { |
| 14 | + const emojiPicker = useEmojiPicker() |
| 15 | + |
| 16 | + const [cursorPos, setCursorPos] = useState<number>(0) |
| 17 | + const [forceOff, setForceOff] = useState(false) |
| 18 | + const [selectedIndex, setSelectedIndex] = useState<number>(0) |
| 19 | + |
| 20 | + // カーソル前のテキストから `:query` パターンを検出 |
| 21 | + const query = useMemo(() => { |
| 22 | + const before = text.slice(0, cursorPos) |
| 23 | + const match = /:(\w+)$/.exec(before) |
| 24 | + return match?.[1] ?? null |
| 25 | + }, [text, cursorPos]) |
| 26 | + |
| 27 | + // 検索結果 |
| 28 | + const suggestions = useMemo(() => { |
| 29 | + if (!query) return [] |
| 30 | + return emojiPicker.search(query, 16) |
| 31 | + }, [query, emojiPicker]) |
| 32 | + |
| 33 | + const showSuggestions = query !== null && suggestions.length > 0 && !forceOff |
| 34 | + |
| 35 | + // query が変わったら選択をリセット（レンダー中のstate調整パターン） |
| 36 | + const [prevQuery, setPrevQuery] = useState(query) |
| 37 | + if (query !== prevQuery) { |
| 38 | + setPrevQuery(query) |
| 39 | + setSelectedIndex(0) |
| 40 | + } |
| 41 | + |
| 42 | + const onConfirm = useCallback( |
| 43 | + (index: number) => { |
| 44 | + const before = text.slice(0, cursorPos) |
| 45 | + const after = text.slice(cursorPos) |
| 46 | + const colonPos = before.lastIndexOf(':') |
| 47 | + if (colonPos === -1) return |
| 48 | + |
| 49 | + const emoji = suggestions[index] |
| 50 | + if (!emoji) return |
| 51 | + |
| 52 | + const newText = before.slice(0, colonPos) + `:${emoji.shortcode}: ` + after |
| 53 | + setText(newText) |
| 54 | + setSelectedIndex(0) |
| 55 | + |
| 56 | + updateEmojiDict((prev) => ({ |
| 57 | + ...prev, |
| 58 | + [emoji.shortcode]: { imageURL: emoji.imageURL } |
| 59 | + })) |
| 60 | + |
| 61 | + setForceOff(true) |
| 62 | + |
| 63 | + // カーソルを挿入位置の後ろに移動 |
| 64 | + requestAnimationFrame(() => { |
| 65 | + const ta = textareaRef.current |
| 66 | + if (ta) { |
| 67 | + const newPos = colonPos + emoji.shortcode.length + 3 |
| 68 | + ta.setSelectionRange(newPos, newPos) |
| 69 | + ta.focus() |
| 70 | + } |
| 71 | + }) |
| 72 | + }, |
| 73 | + [text, cursorPos, suggestions, textareaRef, setText, updateEmojiDict] |
| 74 | + ) |
| 75 | + |
| 76 | + // カーソル位置の追跡 |
| 77 | + useEffect(() => { |
| 78 | + const ta = textareaRef.current |
| 79 | + if (!ta) return |
| 80 | + |
| 81 | + const updateCursor = () => { |
| 82 | + setCursorPos(ta.selectionEnd ?? 0) |
| 83 | + setForceOff(false) |
| 84 | + } |
| 85 | + |
| 86 | + ta.addEventListener('input', updateCursor) |
| 87 | + ta.addEventListener('click', updateCursor) |
| 88 | + |
| 89 | + return () => { |
| 90 | + ta.removeEventListener('input', updateCursor) |
| 91 | + ta.removeEventListener('click', updateCursor) |
| 92 | + } |
| 93 | + }, [textareaRef]) |
| 94 | + |
| 95 | + // keydown: Enter確定 + 矢印キー移動（サジェスト表示中のみ） |
| 96 | + const onKeyDown = useCallback( |
| 97 | + (e: KeyboardEvent) => { |
| 98 | + setForceOff(false) |
| 99 | + if (!showSuggestions) return |
| 100 | + |
| 101 | + if (e.key === 'ArrowUp' || e.key === 'ArrowLeft') { |
| 102 | + e.preventDefault() |
| 103 | + setSelectedIndex((prev) => (prev - 1 + suggestions.length) % suggestions.length) |
| 104 | + return |
| 105 | + } |
| 106 | + if (e.key === 'ArrowDown' || e.key === 'ArrowRight') { |
| 107 | + e.preventDefault() |
| 108 | + setSelectedIndex((prev) => (prev + 1) % suggestions.length) |
| 109 | + return |
| 110 | + } |
| 111 | + if (e.key === 'Enter') { |
| 112 | + e.preventDefault() |
| 113 | + onConfirm(selectedIndex) |
| 114 | + } |
| 115 | + }, |
| 116 | + [showSuggestions, suggestions.length, selectedIndex, onConfirm] |
| 117 | + ) |
| 118 | + |
| 119 | + const onBlur = useCallback(() => { |
| 120 | + setTimeout(() => { |
| 121 | + setForceOff(true) |
| 122 | + }, 100) |
| 123 | + }, []) |
| 124 | + |
| 125 | + useEffect(() => { |
| 126 | + const ta = textareaRef.current |
| 127 | + if (!ta) return |
| 128 | + |
| 129 | + ta.addEventListener('keydown', onKeyDown) |
| 130 | + ta.addEventListener('blur', onBlur) |
| 131 | + |
| 132 | + return () => { |
| 133 | + ta.removeEventListener('keydown', onKeyDown) |
| 134 | + ta.removeEventListener('blur', onBlur) |
| 135 | + } |
| 136 | + }, [textareaRef, onKeyDown, onBlur]) |
| 137 | + |
| 138 | + return ( |
| 139 | + <AnimatePresence> |
| 140 | + {showSuggestions && ( |
| 141 | + <motion.div |
| 142 | + initial={{ opacity: 0, height: 0 }} |
| 143 | + animate={{ opacity: 1, height: 'auto' }} |
| 144 | + exit={{ opacity: 0, height: 0 }} |
| 145 | + transition={{ duration: 0.15 }} |
| 146 | + style={{ overflow: 'hidden' }} |
| 147 | + > |
| 148 | + <div |
| 149 | + style={{ |
| 150 | + display: 'flex', |
| 151 | + overflowX: 'auto', |
| 152 | + gap: CssVar.space(1), |
| 153 | + padding: `${CssVar.space(1)} 0`, |
| 154 | + WebkitOverflowScrolling: 'touch' |
| 155 | + }} |
| 156 | + > |
| 157 | + {suggestions.map((emoji, index) => ( |
| 158 | + <button |
| 159 | + key={emoji.shortcode} |
| 160 | + onMouseDown={(e) => { |
| 161 | + e.preventDefault() |
| 162 | + onConfirm(index) |
| 163 | + }} |
| 164 | + style={{ |
| 165 | + display: 'flex', |
| 166 | + flexDirection: 'column', |
| 167 | + alignItems: 'center', |
| 168 | + gap: '2px', |
| 169 | + padding: CssVar.space(1), |
| 170 | + border: |
| 171 | + index === selectedIndex |
| 172 | + ? `2px solid ${CssVar.contentLink}` |
| 173 | + : '2px solid transparent', |
| 174 | + background: `rgb(from ${CssVar.contentText} r g b / 0.06)`, |
| 175 | + borderRadius: CssVar.round(0.5), |
| 176 | + cursor: 'pointer', |
| 177 | + flexShrink: 0, |
| 178 | + WebkitTapHighlightColor: 'transparent', |
| 179 | + color: CssVar.contentText |
| 180 | + }} |
| 181 | + > |
| 182 | + <img |
| 183 | + src={emoji.imageURL} |
| 184 | + alt={emoji.shortcode} |
| 185 | + style={{ width: '28px', height: '28px' }} |
| 186 | + /> |
| 187 | + <span |
| 188 | + style={{ |
| 189 | + fontSize: '10px', |
| 190 | + opacity: 0.6, |
| 191 | + maxWidth: '56px', |
| 192 | + overflow: 'hidden', |
| 193 | + textOverflow: 'ellipsis', |
| 194 | + whiteSpace: 'nowrap' |
| 195 | + }} |
| 196 | + > |
| 197 | + {emoji.shortcode} |
| 198 | + </span> |
| 199 | + </button> |
| 200 | + ))} |
| 201 | + </div> |
| 202 | + </motion.div> |
| 203 | + )} |
| 204 | + </AnimatePresence> |
| 205 | + ) |
| 206 | +} |
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