Add hiding functionality in ButtonGroup

ts/components/ButtonGroup.svelte

@@ -3,21 +3,21 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="typescript">
+    import ButtonGroupItem from "./ButtonGroupItem.svelte";
     import type { SvelteComponentTyped } from "svelte";
     import { setContext } from "svelte";
     import type { Writable } from "svelte/store";
     import { writable } from "svelte/store";
     import { buttonGroupKey } from "./contextKeys";
     import type { Identifier } from "./identifier";
-    import { insert, add, update } from "./identifier";
+    import { insert, add, update, find } from "./identifier";
 
     export let id: string | undefined = undefined;
     let className: string = "";
     export { className as class };
 
     export let api = {};
-    export let buttonGroupRef: HTMLDivElement;
+    let buttonGroupRef: HTMLDivElement;
-    $: root = buttonGroupRef?.getRootNode() as Document;
 
     interface ButtonRegistration {
         detach: Writable<boolean>;
@@ -25,20 +25,28 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
     const items: ButtonRegistration[] = [];
 
-    function registerButton(): ButtonRegistration {
+    function makeRegistration(): ButtonRegistration {
         const detach = writable(false);
-        const registration = { detach };
+        return { detach };
-        items.push(registration);
+    }
 
+    function registerButton(
+        index = items.length,
+        registration = makeRegistration()
+    ): ButtonRegistration {
+        items.splice(index, 0, registration);
         return registration;
     }
 
+    const dynamicItems: ButtonRegistration[] = [];
     let dynamic: SvelteComponentTyped[] = [];
 
     function addButton(
         button: SvelteComponentTyped,
         add: (added: Element, parent: Element) => number
     ): void {
+        const registration = makeRegistration();
+
         const callback = (
             mutations: MutationRecord[],
             observer: MutationObserver
@@ -48,6 +56,10 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
                 if (addedNode.nodeType === Node.ELEMENT_NODE) {
                     const index = add(addedNode as Element, buttonGroupRef);
+
+                    if (index >= 0) {
+                        registerButton(index, registration);
+                    }
                 }
             }
 
@@ -57,6 +69,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         const observer = new MutationObserver(callback);
         observer.observe(buttonGroupRef, { childList: true });
 
+        dynamicItems.push(registration);
         dynamic = [...dynamic, button];
     }
 
@@ -64,12 +77,26 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         addButton(button, (added, parent) => insert(added, parent, id));
     const appendButton = (button: SvelteComponentTyped, id: Identifier = -1) =>
         addButton(button, (added, parent) => add(added, parent, id));
+
+    function updateRegistration(
+        f: (registration: ButtonRegistration) => void,
+        id: Identifier
+    ): void {
+        const match = find(buttonGroupRef.children, id);
+
+        if (match) {
+            const [index] = match;
+            const registration = items[index];
+            f(registration);
+        }
+    }
+
     const showButton = (id: Identifier) =>
-        update((element) => element.removeAttribute("hidden"), buttonGroupRef, id);
+        updateRegistration(({ detach }) => detach.update(() => false), id);
     const hideButton = (id: Identifier) =>
-        update((element) => element.setAttribute("hidden", ""), buttonGroupRef, id);
+        updateRegistration(({ detach }) => detach.update(() => true), id);
     const toggleButton = (id: Identifier) =>
-        update((element) => element.toggleAttribute("hidden"), buttonGroupRef, id);
+        updateRegistration(({ detach }) => detach.update((old) => !old), id);
 
     setContext(
         buttonGroupKey,
@@ -97,7 +124,9 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 <div bind:this={buttonGroupRef} {id} class={className} dir="ltr">
     <slot />
-    {#each dynamic as component}
+    {#each dynamic as component, i}
+        <ButtonGroupItem registration={dynamicItems[i]}>
             <svelte:component this={component} />
+        </ButtonGroupItem>
     {/each}
 </div>

ts/components/ButtonGroupItem.svelte

@@ -8,8 +8,10 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     import { getContext } from "svelte";
     import { buttonGroupKey } from "./contextKeys";
 
+    export let registration = undefined;
+
     const { registerButton } = getContext(buttonGroupKey);
-    const { detach } = registerButton();
+    const { detach } = registration ?? registerButton();
 </script>
 
 <Detachable detach={$detach}>

ts/components/identifier.ts

@@ -2,54 +2,86 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 export type Identifier = string | number;
 
-function find(collection: HTMLCollection, idOrIndex: Identifier): Element | null {
+export function find(
-    let element: Element | null = null;
+    collection: HTMLCollection,
+    idOrIndex: Identifier
+): [number, Element] | null {
+    let result: [number, Element] | null = null;
 
     if (typeof idOrIndex === "string") {
-        element = collection.namedItem(idOrIndex);
+        const element = collection.namedItem(idOrIndex);
+
+        if (element) {
+            const index = Array.prototype.indexOf.call(collection, element);
+            result = [index, element];
+        }
     } else if (idOrIndex < 0) {
-        const normalizedIndex = collection.length + idOrIndex;
+        const index = collection.length + idOrIndex;
-        element = collection.item(normalizedIndex);
+        const element = collection.item(index);
+
+        if (element) {
+            result = [index, element];
+        }
     } else {
-        element = collection.item(idOrIndex);
+        const index = idOrIndex;
+        const element = collection.item(index);
+
+        if (element) {
+            result = [index, element];
+        }
     }
 
-    return element;
+    return result;
 }
 
 export function insert(
     element: Element,
     collection: Element,
     idOrIndex: Identifier
-): void {
+): number {
-    const reference = find(collection.children, idOrIndex);
+    const match = find(collection.children, idOrIndex);
 
-    if (reference) {
+    if (match) {
-        collection.insertBefore(element, reference);
+        const [index, reference] = match;
+        collection.insertBefore(element, reference[0]);
+
+        return index;
     }
+
+    return -1;
 }
 
 export function add(
     element: Element,
     collection: Element,
     idOrIndex: Identifier
-): void {
+): number {
-    const before = find(collection.children, idOrIndex);
+    const match = find(collection.children, idOrIndex);
 
-    if (before) {
+    if (match) {
+        const [index, before] = match;
         const reference = before.nextElementSibling ?? null;
         collection.insertBefore(element, reference);
+
+        return index + 1;
     }
+
+    return -1;
 }
 
 export function update(
     f: (element: Element) => void,
     collection: Element,
     idOrIndex: Identifier
-): void {
+): number {
-    const element = find(collection.children, idOrIndex);
+    const match = find(collection.children, idOrIndex);
 
-    if (element) {
+    if (match) {
-        f(element);
+        const [index, element] = match;
+        f(element[0]);
+
+        return index;
     }
+
+    return -1;
 }

ts/editor/FormatInlineButtons.svelte

@@ -5,8 +5,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 <script lang="typescript">
     import * as tr from "lib/i18n";
 
-    import IconButton from "components/IconButton.svelte";
     import ButtonGroup from "components/ButtonGroup.svelte";
+    import IconButton from "components/IconButton.svelte";
     import WithState from "components/WithState.svelte";
     import WithShortcut from "components/WithShortcut.svelte";
 

ts/editor/NoteTypeButtons.svelte

@@ -7,20 +7,24 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     import * as tr from "lib/i18n";
 
     import ButtonGroup from "components/ButtonGroup.svelte";
+    import ButtonGroupItem from "components/ButtonGroupItem.svelte";
     import LabelButton from "components/LabelButton.svelte";
     import WithShortcut from "components/WithShortcut.svelte";
 
     export let api = {};
 </script>
 
-<ButtonGroup id="notetype" class="" {api}>
+<ButtonGroup id="notetype" {api}>
+    <ButtonGroupItem>
         <LabelButton
             disables={false}
             tooltip={tr.editingCustomizeFields()}
             on:click={() => bridgeCommand('fields')}>
             {tr.editingFields()}...
         </LabelButton>
+    </ButtonGroupItem>
 
+    <ButtonGroupItem>
         <WithShortcut shortcut="Control+KeyL" let:createShortcut let:shortcutLabel>
             <LabelButton
                 disables={false}
@@ -30,4 +34,5 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
                 {tr.editingCards()}...
             </LabelButton>
         </WithShortcut>
+    </ButtonGroupItem>
 </ButtonGroup>