File size: 4,485 Bytes
3c460c7 | 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 | <script lang="ts">
import { fly } from "svelte/transition";
let {
choices,
filtered_indices,
show_options = false,
disabled = false,
selected_indices = [],
active_index = null,
remember_scroll = false,
offset_from_top = 0,
from_top = false,
onchange,
onload
}: {
choices: [string, string | number][];
filtered_indices: number[];
show_options: boolean;
disabled?: boolean;
selected_indices?: (string | number)[];
active_index: number | null;
remember_scroll?: boolean;
offset_from_top?: number;
from_top?: boolean;
onchange?: (index: any) => void;
onload?: () => void;
} = $props();
let distance_from_top: number;
let distance_from_bottom: number;
let input_height: number;
let input_width = $state(0);
let refElement: HTMLDivElement;
let listElement: HTMLUListElement;
let top: string | null = $state(null);
let bottom: string | null = $state(null);
let max_height: number = $state(0);
let innerHeight = $state(0);
let list_scroll_y = 0;
function calculate_window_distance(): void {
const { top: ref_top, bottom: ref_bottom } =
refElement.getBoundingClientRect();
if (from_top) {
distance_from_top = offset_from_top;
} else {
distance_from_top = ref_top;
}
distance_from_bottom = innerHeight - ref_bottom;
}
let scroll_timeout: NodeJS.Timeout | null = null;
function scroll_listener(): void {
if (!show_options) return;
if (scroll_timeout !== null) {
clearTimeout(scroll_timeout);
}
scroll_timeout = setTimeout(() => {
calculate_window_distance();
scroll_timeout = null;
}, 10);
}
function restore_last_scroll(): void {
listElement?.scrollTo?.(0, list_scroll_y);
}
$effect(() => {
if (show_options && refElement) {
if (remember_scroll) {
restore_last_scroll();
} else {
if (listElement && selected_indices.length > 0) {
let elements = listElement.querySelectorAll("li");
for (const element of Array.from(elements)) {
if (
element.getAttribute("data-index") ===
selected_indices[0].toString()
) {
listElement?.scrollTo?.(0, (element as HTMLLIElement).offsetTop);
break;
}
}
}
}
calculate_window_distance();
const rect = refElement.parentElement?.getBoundingClientRect();
input_height = rect?.height || 0;
input_width = rect?.width || 0;
onload?.();
}
if (distance_from_bottom > distance_from_top || from_top) {
top = `${distance_from_top}px`;
max_height = distance_from_bottom;
bottom = null;
} else {
bottom = `${distance_from_bottom + input_height}px`;
max_height = distance_from_top - input_height;
top = null;
}
});
</script>
<svelte:window on:scroll={scroll_listener} bind:innerHeight />
<div class="reference" bind:this={refElement} />
{#if show_options && !disabled}
<ul
class="options"
transition:fly={{ duration: 200, y: 5 }}
onmousedown={(e) => {
e.preventDefault();
onchange?.((e.target as HTMLElement).dataset.index);
}}
onscroll={(e) => (list_scroll_y = e.currentTarget.scrollTop)}
style:top
style:bottom
style:max-height={`calc(${max_height}px - var(--window-padding))`}
style:width={input_width + "px"}
bind:this={listElement}
role="listbox"
>
{#each filtered_indices as index}
<li
class="item"
class:selected={selected_indices.includes(index)}
class:active={index === active_index}
class:bg-gray-100={index === active_index}
class:dark:bg-gray-600={index === active_index}
style:width={input_width + "px"}
data-index={index}
aria-label={choices[index][0]}
data-testid="dropdown-option"
role="option"
aria-selected={selected_indices.includes(index)}
>
<span class:hide={!selected_indices.includes(index)} class="inner-item">
✓
</span>
{choices[index][0]}
</li>
{/each}
</ul>
{/if}
<style>
.options {
--window-padding: var(--size-8);
position: fixed;
z-index: var(--layer-top);
margin-left: 0;
box-shadow: var(--shadow-drop-lg);
border-radius: var(--container-radius);
background: var(--background-fill-primary);
min-width: fit-content;
max-width: inherit;
overflow: auto;
color: var(--body-text-color);
list-style: none;
}
.item {
display: flex;
cursor: pointer;
padding: var(--size-2);
word-break: break-word;
}
.item:hover,
.active {
background: var(--background-fill-secondary);
}
.inner-item {
padding-right: var(--size-1);
}
.hide {
visibility: hidden;
}
</style>
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