From 900bb5e845c3ad44defbd427cae3d44a4a43321f Mon Sep 17 00:00:00 2001
From: ivarlovlie <git@ivarlovlie.no>
Date: Sat, 25 Feb 2023 13:15:44 +0100
Subject: feat: Initial commit

---
 code/app/src/components/combobox.svelte | 451 ++++++++++++++++++++++++++++++++
 1 file changed, 451 insertions(+)
 create mode 100644 code/app/src/components/combobox.svelte

(limited to 'code/app/src/components/combobox.svelte')

diff --git a/code/app/src/components/combobox.svelte b/code/app/src/components/combobox.svelte
new file mode 100644
index 0000000..396c18a
--- /dev/null
+++ b/code/app/src/components/combobox.svelte
@@ -0,0 +1,451 @@
+<script lang="ts" context="module">
+    export type ComboboxOption = {
+        id: string;
+        name: string;
+        selected?: boolean;
+    };
+</script>
+
+<script lang="ts">
+    import { CheckCircleIcon, ChevronUpDownIcon, XIcon } from "./icons";
+    import { random_string } from "$utilities/misc-helpers";
+    import { go, highlight } from "fuzzysort";
+    import Badge from "./badge.svelte";
+    import Button from "./button.svelte";
+    import LL from "$i18n/i18n-svelte";
+    import { element_has_focus } from "$utilities/dom-helpers";
+
+    export let id = "combobox-" + random_string(3);
+    export let label: string | undefined = undefined;
+    export let errorText: string | undefined = undefined;
+    export let disabled: boolean | undefined = undefined;
+    export let required: boolean | undefined = undefined;
+    export let maxlength: number | undefined = undefined;
+    export let placeholder: string = $LL.combobox.search();
+    export let options: Array<ComboboxOption> | undefined = [];
+    export let createable = false;
+    export let loading = false;
+    export let multiple = false;
+    export let noResultsText: string = $LL.combobox.noRecordsFound();
+    export let on_create_async = async ({ name: string }) => {};
+
+    export const reset = () => methods.reset();
+    export const select = (id: string) => methods.select_entry(id);
+    export const deselect = (id: string) => methods.deselect_entry(id);
+
+    const INTERNAL_ID = "INTERNAL__" + id;
+
+    let optionsListId = id + "--options";
+    let searchInputNode;
+    let searchResults: Array<any> = [];
+    let searchValue = "";
+    let showCreationHint = false;
+    let showDropdown = false;
+    let inputHasFocus = false;
+    let lastKeydownCode = "";
+    let mouseIsOverDropdown = false;
+    let mouseIsOverComponent = false;
+
+    $: ariaErrorDescribedBy = id + "__" + "error";
+    $: colorName = errorText ? "red" : "teal";
+    $: attributes = {
+        "aria-describedby": errorText ? ariaErrorDescribedBy : null,
+        "aria-invalid": errorText ? "true" : null,
+        disabled: disabled || null,
+        required: required || null,
+        maxlength: maxlength || null,
+        id: id || null,
+        placeholder: placeholder || null,
+    } as any;
+    $: hasSelection = options.some((c) => c.selected === true);
+    $: if (searchValue.trim()) {
+        showCreationHint = createable && options.every((c) => search.normalise_value(c.name) !== search.normalise_value(searchValue));
+    } else {
+        showCreationHint = false;
+        options = methods.get_sorted_array(options);
+    }
+
+    function on_select(event) {
+        const node = event.target.closest("[data-id]");
+        if (!node) return;
+        methods.select_entry(node.dataset.id);
+    }
+
+    const search = {
+        normalise_value(value: string): string {
+            if (!value) {
+                return "";
+            }
+            return value.trim().toLowerCase();
+        },
+        do() {
+            const query = search.normalise_value(searchValue);
+
+            if (!query.trim()) {
+                searchResults = [];
+                return;
+            }
+
+            // @ts-ignore
+            searchResults = go(query, options, {
+                limit: 15,
+                allowTypo: true,
+                threshold: -10000,
+                key: "name",
+            });
+            showDropdown = true;
+        },
+        on_input_focus() {
+            showDropdown = true;
+            inputHasFocus = true;
+        },
+        on_input_click() {
+            showDropdown = true;
+            inputHasFocus = true;
+        },
+        on_input_focusout() {
+            inputHasFocus = false;
+            if (lastKeydownCode !== "Tab" && (mouseIsOverDropdown || lastKeydownCode === "ArrowDown")) {
+                return;
+            }
+            const selected = options.find((c) => c.selected === true);
+            if (selected && !multiple) {
+                searchValue = selected.name;
+            }
+            document.querySelector("#" + INTERNAL_ID + " ul li.focus")?.classList.remove("focus");
+            showDropdown = false;
+        },
+        on_input_wrapper_focus(event) {
+            if (event.code && event.code !== "Space" && event.code !== "Enter") return;
+            if (!element_has_focus(searchInputNode)) searchInputNode.focus();
+            showDropdown = true;
+        },
+    };
+
+    const methods = {
+        reset(focus_input = false) {
+            searchValue = "";
+            const copy = options;
+            for (const entry of copy) {
+                entry.selected = false;
+            }
+            options = methods.get_sorted_array(copy);
+            if (focus_input) {
+                searchInputNode?.focus();
+                showDropdown = true;
+            } else {
+                showDropdown = false;
+            }
+        },
+        async create_entry(name: string) {
+            if (!name || !createable || loading) {
+                console.log("Not sending creation event due to failed preconditions", { name, createable, loading });
+                return;
+            }
+            try {
+                await on_create_async({ name });
+                searchValue = "";
+                loading = false;
+            } catch (e) {
+                console.error(e);
+            }
+        },
+        select_entry(entryId: string) {
+            if (!entryId || loading) {
+                console.log("Not selecting entry due to failed preconditions", {
+                    entryId,
+                    loading,
+                });
+                return;
+            }
+
+            const copy = options;
+            for (const entry of options) {
+                if (entry.id === entryId) {
+                    entry.selected = true;
+                    if (multiple) {
+                        searchValue = "";
+                    } else {
+                        searchValue = entry.name;
+                    }
+                } else if (!multiple) {
+                    entry.selected = false;
+                }
+            }
+            options = methods.get_sorted_array(copy);
+            searchInputNode?.focus();
+            searchResults = [];
+        },
+        deselect_entry(entryId: string) {
+            if (!entryId || loading) {
+                console.log("Not deselecting entry due to failed preconditions", {
+                    entryId,
+                    loading,
+                });
+                return;
+            }
+            console.log("Deselecting entry", entryId);
+
+            const copy = options;
+
+            for (const entry of copy) {
+                if (entry.id === entryId) {
+                    entry.selected = false;
+                }
+            }
+
+            options = methods.get_sorted_array(copy);
+            searchInputNode?.focus();
+        },
+        get_sorted_array(options: Array<ComboboxOption>): Array<ComboboxOption> {
+            if (!options) {
+                return;
+            }
+            if (options.length < 1) {
+                return [];
+            }
+            if (searchValue) {
+                return options;
+            }
+
+            return options.sort((a, b) => search.normalise_value(a.name).localeCompare(search.normalise_value(b.name)));
+        },
+    };
+
+    const windowEvents = {
+        on_mousemove(event: any) {
+            if (!event.target) return;
+            mouseIsOverDropdown = event.target?.closest("#" + INTERNAL_ID + " .tongue") != null ?? false;
+            mouseIsOverComponent = event.target?.closest("#" + INTERNAL_ID) != null ?? false;
+        },
+        on_click() {
+            if (showDropdown && !mouseIsOverDropdown && !mouseIsOverComponent) {
+                showDropdown = false;
+            }
+        },
+        on_keydown(event: any) {
+            lastKeydownCode = event.code;
+            const enterPressed = event.code === "Enter";
+            const backspacePressed = event.code === "Backspace";
+            const arrowUpPressed = event.code === "ArrowUp";
+            const spacePressed = event.code === "Space";
+            const arrowDownPressed = event.code === "ArrowDown";
+            const searchInputHasFocus = element_has_focus(searchInputNode);
+            const focusedEntry = document.querySelector("#" + INTERNAL_ID + " ul li.focus") as HTMLLIElement;
+
+            if (showDropdown && (enterPressed || arrowDownPressed || arrowUpPressed)) {
+                event.preventDefault();
+            }
+
+            if (searchInputHasFocus && backspacePressed && !searchValue && options.length > 0) {
+                if (options.filter((c) => c.selected === true).at(-1)?.id ?? false) {
+                    methods.deselect_entry(options.filter((c) => c.selected === true).at(-1)?.id ?? "");
+                }
+                return;
+            }
+
+            if (searchInputHasFocus && enterPressed && showCreationHint) {
+                methods.create_entry(searchValue.trim());
+                return;
+            }
+
+            if (searchInputHasFocus && !focusedEntry && arrowDownPressed) {
+                const firstEntry = document.querySelector("#" + INTERNAL_ID + " ul li:first-of-type");
+                if (firstEntry) {
+                    firstEntry.classList.add("focus");
+                    return;
+                }
+            }
+
+            if (focusedEntry && (arrowUpPressed || arrowDownPressed)) {
+                if (arrowDownPressed) {
+                    if (focusedEntry.nextElementSibling) {
+                        focusedEntry.nextElementSibling.classList.add("focus");
+                        focusedEntry.nextElementSibling.scrollIntoView(false);
+                    } else {
+                        const firstLIEl = document.querySelector("#" + INTERNAL_ID + " ul li:first-of-type");
+                        firstLIEl.classList.add("focus");
+                        firstLIEl.scrollIntoView(false);
+                    }
+                } else if (arrowUpPressed) {
+                    if (focusedEntry.previousElementSibling) {
+                        focusedEntry.previousElementSibling.classList.add("focus");
+                        focusedEntry.previousElementSibling.scrollIntoView(false);
+                    } else {
+                        const lastLIEl = document.querySelector("#" + INTERNAL_ID + " ul li:last-of-type");
+                        lastLIEl.classList.add("focus");
+                        lastLIEl.scrollIntoView(false);
+                    }
+                }
+                focusedEntry.classList.remove("focus");
+                return;
+            }
+
+            if (focusedEntry && (spacePressed || enterPressed)) {
+                methods.select_entry(focusedEntry.dataset.id);
+                return;
+            }
+
+            if (lastKeydownCode === "Tab" && !searchInputHasFocus) {
+                showDropdown = false;
+            }
+        },
+        on_touchend(event) {
+            windowEvents.on_mousemove(event);
+        },
+    };
+</script>
+
+<svelte:window
+    on:keydown={windowEvents.on_keydown}
+    on:mousemove={windowEvents.on_mousemove}
+    on:touchend={windowEvents.on_touchend}
+    on:click={windowEvents.on_click}
+/>
+
+<div id={INTERNAL_ID} class:cursor-wait={loading}>
+    {#if label}
+        <label for={id} class="block text-sm font-medium text-gray-700">
+            {label}
+            {@html required ? "<span class='text-red-500'>*</span>" : ""}
+        </label>
+    {/if}
+    <div class="relative {label ? 'mt-1' : ''}">
+        <div
+            on:click={search.on_input_wrapper_focus}
+            on:keypress={search.on_input_wrapper_focus}
+            class="cursor-text w-full flex rounded-md border bg-white py-2 pl-3 pr-12 sm:text-sm
+            {inputHasFocus ? `border-${colorName}-500 outline-none ring-1 ring-${colorName}-500` : 'shadow-sm border-gray-300'}"
+        >
+            {#if multiple === true && hasSelection}
+                <div class="flex gap-1 flex-wrap">
+                    {#each options.filter((c) => c.selected === true) as option}
+                        <Badge
+                            id={option.id}
+                            removable
+                            tabindex="-1"
+                            on:remove={(e) => methods.deselect_entry(e.detail.id)}
+                            text={option.name}
+                        />
+                    {/each}
+                </div>
+            {/if}
+            <div>
+                <input
+                    {...attributes}
+                    type="text"
+                    style="all: unset;"
+                    role="combobox"
+                    aria-controls={optionsListId}
+                    aria-expanded={showDropdown}
+                    bind:value={searchValue}
+                    bind:this={searchInputNode}
+                    on:input={() => search.do()}
+                    on:click={search.on_input_click}
+                    on:focus={search.on_input_focus}
+                    on:blur={search.on_input_focusout}
+                    autocomplete="off"
+                />
+                {#if hasSelection}
+                    <button
+                        type="button"
+                        on:click={() => reset()}
+                        title={$LL.reset()}
+                        tabindex="-1"
+                        class="text-gray-400 absolute cursor-pointer inset-y-0 right-0 flex items-center rounded-r-md px-2"
+                    >
+                        <XIcon />
+                    </button>
+                {:else}
+                    <span tabindex="-1" class="text-gray-400 absolute inset-y-0 right-0 flex items-center rounded-r-md px-2">
+                        <ChevronUpDownIcon />
+                    </span>
+                {/if}
+            </div>
+        </div>
+        {#if errorText}
+            <p class="mt-2 text-sm text-red-600" id={ariaErrorDescribedBy}>
+                {errorText}
+            </p>
+        {/if}
+        <div
+            class="tongue {showDropdown ? 'absolute' : 'hidden'}
+                z-10 mt-1 max-h-60 w-full overflow-auto rounded-md bg-white
+                text-base shadow-lg ring-1 ring-teal ring-opacity-5 focus:outline-none sm:text-sm"
+        >
+            <ul id={optionsListId} role="listbox" tabindex="-1">
+                {#if searchResults.length > 0}
+                    {#each searchResults.filter((c) => !c.selected) as result}
+                        <li
+                            class="item"
+                            data-id={result.obj.id}
+                            aria-selected={result.obj.selected}
+                            role="option"
+                            on:click={on_select}
+                            on:keypress={on_select}
+                            tabindex="-1"
+                        >
+                            {@html highlight(result, '<span class="font-bold">', "</span>")}
+                        </li>
+                    {/each}
+                {:else if options.length > 0}
+                    {#each options as option}
+                        <!--
+                            Combobox option, manage highlight styles based on mouseenter/mouseleave and keyboard navigation.
+                            Active: "text-white bg-indigo-600", Not Active: "text-gray-900"
+                        -->
+                        <li
+                            class="item"
+                            aria-selected={option.selected}
+                            role="option"
+                            data-id={option.id}
+                            on:click={on_select}
+                            on:keypress={on_select}
+                            tabindex="-1"
+                        >
+                            <span class="block truncate {option.selected ? 'text-semibold' : ''}">{option.name}</span>
+                            {#if option.selected}
+                                <span class="absolute inset-y-0 right-0 flex items-center pr-4 text-{colorName}-600">
+                                    <CheckCircleIcon />
+                                </span>
+                            {/if}
+                        </li>
+                    {/each}
+                {:else}
+                    <slot name="no-records">
+                        <p class="px-2">{noResultsText}</p>
+                        {#if createable && !searchValue}
+                            <p class="px-2 text-gray-500">{$LL.combobox.createRecordHelpText()}</p>
+                        {/if}
+                    </slot>
+                {/if}
+            </ul>
+            {#if showCreationHint}
+                <div class="sticky bottom-0 w-full bg-white">
+                    <Button
+                        text={$LL.combobox.createRecordButtonText(searchValue.trim())}
+                        title={$LL.combobox.createRecordButtonText(searchValue.trim())}
+                        {loading}
+                        kind="reset"
+                        type="button"
+                        on:click={() => methods.create_entry(searchValue.trim())}
+                    />
+                </div>
+            {/if}
+        </div>
+    </div>
+</div>
+
+<style lang="postcss">
+    .focus {
+        @apply text-white bg-teal-300;
+    }
+
+    .item {
+        @apply relative cursor-pointer select-none py-2 pl-3 pr-9 text-gray-900;
+    }
+
+    .item[aria-selected="true"] {
+        @apply bg-teal-200;
+    }
+</style>
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