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
|
<script>
import { UP_KEY_CODE, DOWN_KEY_CODE, TAB_KEY_CODE } from '~/lib/utils/keycodes';
export default {
model: {
prop: 'index',
event: 'change',
},
props: {
/* v-model property to manage location in list */
index: {
type: Number,
required: true,
},
/* Highest index that can be navigated to */
max: {
type: Number,
required: true,
},
/* Lowest index that can be navigated to */
min: {
type: Number,
required: true,
},
/* Which index to set v-model to on init */
defaultIndex: {
type: Number,
required: true,
},
/* enable possibility to cycle around */
enableCycle: {
type: Boolean,
required: false,
default: false,
},
},
watch: {
max() {
// If the max index (list length) changes, reset the index
this.$emit('change', this.defaultIndex);
},
},
created() {
this.$emit('change', this.defaultIndex);
document.addEventListener('keydown', this.handleKeydown);
},
beforeDestroy() {
document.removeEventListener('keydown', this.handleKeydown);
},
methods: {
handleKeydown(event) {
if (event.keyCode === DOWN_KEY_CODE) {
// Prevents moving scrollbar
event.preventDefault();
event.stopPropagation();
// Moves to next index
this.increment(1);
} else if (event.keyCode === UP_KEY_CODE) {
// Prevents moving scrollbar
event.preventDefault();
event.stopPropagation();
// Moves to previous index
this.increment(-1);
} else if (event.keyCode === TAB_KEY_CODE) {
this.$emit('tab');
}
},
increment(val) {
if (this.max === 0) {
return;
}
let nextIndex = Math.max(this.min, Math.min(this.index + val, this.max));
if (nextIndex === this.index) {
// Return if the index didn't change and cycle is not enabled
if (!this.enableCycle) {
return;
}
// Update nextIndex if the cycle is enabled
nextIndex = this.cycle(nextIndex, val);
}
this.$emit('change', nextIndex);
},
cycle(nextIndex, val) {
if (val === 1 && nextIndex === this.max) {
// if we are moving down +1 and we reached bottom (max)
// return top most index (min)
return this.min;
}
if (val === -1 && nextIndex === this.min) {
// if we are moving up -1 and we reached top (min)
// return bottom most index (max)
return this.max;
}
return nextIndex;
},
},
render() {
return this.$scopedSlots.default?.();
},
};
</script>
|
