From 304ffd45bad7d94fc63c31b807c826d3541a6058 Mon Sep 17 00:00:00 2001
From: Christoph Urlacher <christoph.urlacher@protonmail.com>
Date: Sat, 14 Dec 2024 03:34:08 +0100
Subject: [PATCH] Lib: Implement dropdown + search/autocomplete components

---
 src/lib/components/Dropdown.svelte | 86 ++++++++++++++++++++++++++++++
 src/lib/components/Search.svelte   | 83 ++++++++++++++++++++++++++++
 src/lib/components/index.ts        | 15 +++++-
 3 files changed, 183 insertions(+), 1 deletion(-)
 create mode 100644 src/lib/components/Dropdown.svelte
 create mode 100644 src/lib/components/Search.svelte

diff --git a/src/lib/components/Dropdown.svelte b/src/lib/components/Dropdown.svelte
new file mode 100644
index 0000000..a4bb86e
--- /dev/null
+++ b/src/lib/components/Dropdown.svelte
@@ -0,0 +1,86 @@
+<script lang="ts">
+  import { ListBox, ListBoxItem, popup, type PopupSettings } from "@skeletonlabs/skeleton";
+  import type { Snippet } from "svelte";
+  import type { HTMLInputAttributes } from "svelte/elements";
+  import { v4 as uuid } from "uuid";
+  import UserIcon from "./svg/UserIcon.svelte";
+
+  export interface DropdownOption {
+    label: string;
+    value: string;
+  }
+
+  interface SearchProps extends HTMLInputAttributes {
+    children: Snippet;
+
+    /** Placeholder for the empty input element */
+    placeholder?: string;
+
+    /** Form name of the input element, to reference input data after form submission */
+    name?: string;
+
+    /** Manually set the label width, to align multiple inputs vertically. Supply value in CSS units. */
+    labelwidth?: string;
+
+    /** The variable to bind to the input element. Has to be a [$state] so its value can be updated with the input element's contents. */
+    input_variable: string;
+
+    /** The ID of the popup to trigger. UUID by default. */
+    popup_id?: string;
+
+    /** The [PopupSettings] object for the popup to trigger. */
+    popup_settings?: PopupSettings;
+
+    /** The options this autocomplete component allows to choose from.
+     * Example: [[{ label: "Aston", value: "0" }, { label: "VCARB", value: "1" }]].
+     */
+    options: DropdownOption[];
+  }
+
+  let {
+    children,
+    placeholder = "",
+    name = "",
+    labelwidth = "auto",
+    input_variable,
+    popup_id = uuid(),
+    popup_settings = {
+      event: "click",
+      target: popup_id,
+      placement: "bottom",
+      closeQuery: ".listbox-item",
+    },
+    options,
+    ...restProps
+  }: SearchProps = $props();
+
+  const get_label = (value: string): string | undefined => {
+    return options.find((o) => o.value === value)?.label;
+  };
+</script>
+
+<div class="input-group input-group-divider grid-cols-[auto_1fr_auto]">
+  <div
+    class="input-group-shim select-none text-nowrap text-neutral-900"
+    style="width: {labelwidth};"
+  >
+    {@render children()}
+  </div>
+  <input
+    use:popup={popup_settings}
+    type="text"
+    value={get_label(input_variable) ?? placeholder}
+    {...restProps}
+  />
+</div>
+
+<div data-popup={popup_id} class="card z-10 w-auto p-2 shadow">
+  <ListBox>
+    {#each options as option}
+      <ListBoxItem bind:group={input_variable} {name} value={option.value}
+        >{option.label}</ListBoxItem
+      >
+    {/each}
+  </ListBox>
+  <div class="bg-surface-100-800-token arrow"></div>
+</div>
diff --git a/src/lib/components/Search.svelte b/src/lib/components/Search.svelte
new file mode 100644
index 0000000..3ac0be8
--- /dev/null
+++ b/src/lib/components/Search.svelte
@@ -0,0 +1,83 @@
+<script lang="ts">
+  import {
+    Autocomplete,
+    popup,
+    type AutocompleteOption,
+    type PopupSettings,
+  } from "@skeletonlabs/skeleton";
+  import type { Snippet } from "svelte";
+  import { v4 as uuid } from "uuid";
+
+  interface SearchProps {
+    children: Snippet;
+
+    /** Placeholder for the empty input element */
+    placeholder?: string;
+
+    /** Form name of the input element, to reference input data after form submission */
+    name?: string;
+
+    /** Manually set the label width, to align multiple inputs vertically. Supply value in CSS units. */
+    labelwidth?: string;
+
+    /** The variable to bind to the input element. Has to be a [$state] so its value can be updated with the input element's contents. */
+    input_variable: string;
+
+    /** The ID of the input element. UUID by default. */
+    input_id?: string;
+
+    /** The ID of the popup to trigger. UUID by default. */
+    popup_id?: string;
+
+    /** The [PopupSettings] object for the popup to trigger. */
+    popup_settings?: PopupSettings;
+
+    /** The event handler updating the [input_variable] after selection. */
+    selection_handler?: (event: CustomEvent<AutocompleteOption<string>>) => void;
+
+    /** The options this autocomplete component allows to choose from.
+     * Example: [[{ label: "Aston", value: "0" }, { label: "VCARB", value: "1" }]].
+     */
+    options: AutocompleteOption<string, unknown>[];
+  }
+
+  let {
+    children,
+    placeholder = "",
+    name = "",
+    labelwidth = "auto",
+    input_variable,
+    input_id = uuid(),
+    popup_id = uuid(),
+    popup_settings = {
+      event: "focus-click",
+      target: popup_id,
+      placement: "bottom",
+    },
+    selection_handler = (event: CustomEvent<AutocompleteOption<string>>): void => {
+      input_variable = event.detail.label;
+    },
+    options,
+  }: SearchProps = $props();
+</script>
+
+<div class="input-group input-group-divider grid-cols-[auto_1fr_auto]">
+  <div
+    class="input-group-shim select-none text-nowrap text-neutral-900"
+    style="width: {labelwidth};"
+  >
+    {@render children()}
+  </div>
+  <input
+    id={input_id}
+    type="search"
+    {placeholder}
+    {name}
+    bind:value={input_variable}
+    use:popup={popup_settings}
+  />
+</div>
+
+<div data-popup={popup_id} class="card z-10 w-auto p-2 shadow" tabindex="-1">
+  <Autocomplete bind:input={input_variable} {options} on:selection={selection_handler} />
+</div>
diff --git a/src/lib/components/index.ts b/src/lib/components/index.ts
index f968087..8e7c484 100644
--- a/src/lib/components/index.ts
+++ b/src/lib/components/index.ts
@@ -1,9 +1,22 @@
 import Input from "./Input.svelte";
 import Button from "./Button.svelte";
 import Card from "./Card.svelte";
+import Search from "./Search.svelte";
+import Dropdown from "./Dropdown.svelte";
+// import type DropdownOption from "./Dropdown.svelte";
 
 import MenuDrawerIcon from "./svg/MenuDrawerIcon.svelte";
 import UserIcon from "./svg/UserIcon.svelte";
 import PasswordIcon from "./svg/PasswordIcon.svelte";
 
-export { Input, Button, Card, MenuDrawerIcon, UserIcon, PasswordIcon };
+export {
+  Input,
+  Button,
+  Card,
+  Search,
+  Dropdown,
+  // type DropdownOption,
+  MenuDrawerIcon,
+  UserIcon,
+  PasswordIcon,
+};