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
|
/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { useState, useCallback } from 'react';
import {
MAX_SUGGESTIONS_TO_SHOW,
Suggestion,
} from '../components/SuggestionsDisplay.js';
export interface UseCompletionReturn {
suggestions: Suggestion[];
activeSuggestionIndex: number;
visibleStartIndex: number;
showSuggestions: boolean;
isLoadingSuggestions: boolean;
isPerfectMatch: boolean;
setSuggestions: React.Dispatch<React.SetStateAction<Suggestion[]>>;
setActiveSuggestionIndex: React.Dispatch<React.SetStateAction<number>>;
setVisibleStartIndex: React.Dispatch<React.SetStateAction<number>>;
setIsLoadingSuggestions: React.Dispatch<React.SetStateAction<boolean>>;
setIsPerfectMatch: React.Dispatch<React.SetStateAction<boolean>>;
setShowSuggestions: React.Dispatch<React.SetStateAction<boolean>>;
resetCompletionState: () => void;
navigateUp: () => void;
navigateDown: () => void;
}
export function useCompletion(): UseCompletionReturn {
const [suggestions, setSuggestions] = useState<Suggestion[]>([]);
const [activeSuggestionIndex, setActiveSuggestionIndex] =
useState<number>(-1);
const [visibleStartIndex, setVisibleStartIndex] = useState<number>(0);
const [showSuggestions, setShowSuggestions] = useState<boolean>(false);
const [isLoadingSuggestions, setIsLoadingSuggestions] =
useState<boolean>(false);
const [isPerfectMatch, setIsPerfectMatch] = useState<boolean>(false);
const resetCompletionState = useCallback(() => {
setSuggestions([]);
setActiveSuggestionIndex(-1);
setVisibleStartIndex(0);
setShowSuggestions(false);
setIsLoadingSuggestions(false);
setIsPerfectMatch(false);
}, []);
const navigateUp = useCallback(() => {
if (suggestions.length === 0) return;
setActiveSuggestionIndex((prevActiveIndex) => {
// Calculate new active index, handling wrap-around
const newActiveIndex =
prevActiveIndex <= 0 ? suggestions.length - 1 : prevActiveIndex - 1;
// Adjust scroll position based on the new active index
setVisibleStartIndex((prevVisibleStart) => {
// Case 1: Wrapped around to the last item
if (
newActiveIndex === suggestions.length - 1 &&
suggestions.length > MAX_SUGGESTIONS_TO_SHOW
) {
return Math.max(0, suggestions.length - MAX_SUGGESTIONS_TO_SHOW);
}
// Case 2: Scrolled above the current visible window
if (newActiveIndex < prevVisibleStart) {
return newActiveIndex;
}
// Otherwise, keep the current scroll position
return prevVisibleStart;
});
return newActiveIndex;
});
}, [suggestions.length]);
const navigateDown = useCallback(() => {
if (suggestions.length === 0) return;
setActiveSuggestionIndex((prevActiveIndex) => {
// Calculate new active index, handling wrap-around
const newActiveIndex =
prevActiveIndex >= suggestions.length - 1 ? 0 : prevActiveIndex + 1;
// Adjust scroll position based on the new active index
setVisibleStartIndex((prevVisibleStart) => {
// Case 1: Wrapped around to the first item
if (
newActiveIndex === 0 &&
suggestions.length > MAX_SUGGESTIONS_TO_SHOW
) {
return 0;
}
// Case 2: Scrolled below the current visible window
const visibleEndIndex = prevVisibleStart + MAX_SUGGESTIONS_TO_SHOW;
if (newActiveIndex >= visibleEndIndex) {
return newActiveIndex - MAX_SUGGESTIONS_TO_SHOW + 1;
}
// Otherwise, keep the current scroll position
return prevVisibleStart;
});
return newActiveIndex;
});
}, [suggestions.length]);
return {
suggestions,
activeSuggestionIndex,
visibleStartIndex,
showSuggestions,
isLoadingSuggestions,
isPerfectMatch,
setSuggestions,
setShowSuggestions,
setActiveSuggestionIndex,
setVisibleStartIndex,
setIsLoadingSuggestions,
setIsPerfectMatch,
resetCompletionState,
navigateUp,
navigateDown,
};
}
|
