Tiptap RTE: Reduce loading layout shift (#19860)

* Tiptap RTE: Set row/group min-height to prevent layout shift

* Added `box-sizing: border-box`

* Adds loaded state to the editor

so that the border only appears once it's ready.

* Refactored toolbar to reduce the number of re-renders

* Refactored statusbar to reduce the number of re-renders

src/Umbraco.Web.UI.Client/src/packages/tiptap/components/input-tiptap/input-tiptap.element.ts

@@ -193,7 +193,7 @@ export class UmbInputTiptapElement extends UmbFormControlMixin<string, typeof Um
 		return html`
 			${when(loading, () => html`<div id="loader"><uui-loader></uui-loader></div>`)}
 			${when(!loading, () => html`${this.#renderStyles()}${this.#renderToolbar()}`)}
-			<div id="editor" data-mark="input:tiptap-rte"></div>
+			<div id="editor" data-mark="input:tiptap-rte" ?data-loaded=${!loading}></div>
 			${when(!loading, () => this.#renderStatusbar())}
 		`;
 	}
@@ -277,7 +277,7 @@ export class UmbInputTiptapElement extends UmbFormControlMixin<string, typeof Um
 				display: flex;
 				overflow: auto;
 				border-radius: var(--uui-border-radius);
-				border: 1px solid var(--umb-tiptap-edge-border-color, var(--uui-color-border));
+				border: 1px solid transparent;
 				padding: 1rem;
 				box-sizing: border-box;
 
@@ -288,6 +288,10 @@ export class UmbInputTiptapElement extends UmbFormControlMixin<string, typeof Um
 				width: 100%;
 				max-width: 100%;
 
+				&[data-loaded] {
+					border-color: var(--umb-tiptap-edge-border-color, var(--uui-color-border));
+				}
+
 				> .tiptap {
 					height: 100%;
 					width: 100%;

src/Umbraco.Web.UI.Client/src/packages/tiptap/components/input-tiptap/tiptap-statusbar.element.ts

@@ -1,18 +1,26 @@
 import type { UmbTiptapStatusbarValue } from '../types.js';
-import { css, customElement, html, map, nothing, property, state } from '@umbraco-cms/backoffice/external/lit';
+import { css, customElement, html, nothing, property, repeat } from '@umbraco-cms/backoffice/external/lit';
+import { debounce } from '@umbraco-cms/backoffice/utils';
 import { umbExtensionsRegistry } from '@umbraco-cms/backoffice/extension-registry';
 import { UmbLitElement } from '@umbraco-cms/backoffice/lit-element';
 import { UmbExtensionsElementInitializer } from '@umbraco-cms/backoffice/extension-api';
 import type { Editor } from '@umbraco-cms/backoffice/external/tiptap';
 import type { UmbPropertyEditorConfigCollection } from '@umbraco-cms/backoffice/property-editor';
 
+/**
+ * Provides a status bar for the {@link UmbInputTiptapElement}
+ * @element umb-tiptap-statusbar
+ * @cssprop --umb-tiptap-edge-border-color - Defines the edge border color
+ */
 @customElement('umb-tiptap-statusbar')
 export class UmbTiptapStatusbarElement extends UmbLitElement {
 	#attached = false;
+
+	#debouncer = debounce(() => this.requestUpdate(), 100);
+
 	#extensionsController?: UmbExtensionsElementInitializer;
 
-	@state()
-	private _lookup?: Map<string, unknown>;
+	#lookup: Map<string, unknown> = new Map();
 
 	@property({ type: Boolean, reflect: true })
 	readonly = false;
@@ -61,12 +69,13 @@ export class UmbTiptapStatusbarElement extends UmbLitElement {
 			'tiptapStatusbarExtension',
 			(manifest) => this.statusbar.flat().includes(manifest.alias),
 			(extensionControllers) => {
-				this._lookup = new Map(
-					extensionControllers.map((ext) => {
+				extensionControllers.forEach((ext) => {
+					if (!this.#lookup.has(ext.alias)) {
 						(ext.component as HTMLElement)?.setAttribute('data-mark', `action:tiptap-statusbar:${ext.alias}`);
-						return [ext.alias, ext.component];
-					}),
-				);
+						this.#lookup.set(ext.alias, ext.component);
+						this.#debouncer();
+					}
+				});
 			},
 		);
 
@@ -75,10 +84,15 @@ export class UmbTiptapStatusbarElement extends UmbLitElement {
 
 	override render() {
 		if (!this.statusbar.flat().length) return nothing;
-		return map(
-			this.statusbar,
-			(area) => html`<div class="area">${map(area, (alias) => this._lookup?.get(alias) ?? nothing)}</div>`,
-		);
+		return this.#renderAreas(this.statusbar);
+	}
+
+	#renderAreas(statusbar: UmbTiptapStatusbarValue) {
+		return repeat(statusbar, (area) => html`<div class="area">${this.#renderActions(area)}</div>`);
+	}
+
+	#renderActions(aliases: Array<string>) {
+		return repeat(aliases, (alias) => this.#lookup?.get(alias) ?? nothing);
 	}
 
 	static override readonly styles = css`
@@ -95,10 +109,11 @@ export class UmbTiptapStatusbarElement extends UmbLitElement {
 			justify-content: space-between;
 
 			border-radius: var(--uui-border-radius);
-			border: 1px solid var(--uui-color-border);
+			border: 1px solid var(--umb-tiptap-edge-border-color, var(--uui-color-border));
 			border-top-left-radius: 0;
 			border-top-right-radius: 0;
 			border-top: 0;
+			box-sizing: border-box;
 
 			min-height: var(--uui-size-layout-1);
 			max-height: var(--uui-size-layout-2);

src/Umbraco.Web.UI.Client/src/packages/tiptap/components/input-tiptap/tiptap-toolbar.element.ts

@@ -1,5 +1,6 @@
 import type { UmbTiptapToolbarValue } from '../types.js';
-import { css, customElement, html, map, nothing, property, state } from '@umbraco-cms/backoffice/external/lit';
+import { css, customElement, html, nothing, property, repeat } from '@umbraco-cms/backoffice/external/lit';
+import { debounce } from '@umbraco-cms/backoffice/utils';
 import { umbExtensionsRegistry } from '@umbraco-cms/backoffice/extension-registry';
 import { UmbExtensionsElementAndApiInitializer } from '@umbraco-cms/backoffice/extension-api';
 import { UmbLitElement } from '@umbraco-cms/backoffice/lit-element';
@@ -9,18 +10,20 @@ import type { UmbPropertyEditorConfigCollection } from '@umbraco-cms/backoffice/
 import '../cascading-menu-popover/cascading-menu-popover.element.js';
 
 /**
-* Provides a sticky toolbar for the {@link UmbInputTiptapElement}
-* @element umb-tiptap-toolbar
-* @cssprop --umb-tiptap-edge-border-color - Defines the edge border color
-* @cssprop --umb-tiptap-top - Defines the top value for the sticky toolbar
-*/
+ * Provides a sticky toolbar for the {@link UmbInputTiptapElement}
+ * @element umb-tiptap-toolbar
+ * @cssprop --umb-tiptap-edge-border-color - Defines the edge border color
+ * @cssprop --umb-tiptap-top - Defines the top value for the sticky toolbar
+ */
 @customElement('umb-tiptap-toolbar')
 export class UmbTiptapToolbarElement extends UmbLitElement {
 	#attached = false;
+
+	#debouncer = debounce(() => this.requestUpdate(), 100);
+
 	#extensionsController?: UmbExtensionsElementAndApiInitializer;
 
-	@state()
-	private _lookup?: Map<string, unknown>;
+	#lookup: Map<string, unknown> = new Map();
 
 	@property({ type: Boolean, reflect: true })
 	readonly = false;
@@ -58,12 +61,13 @@ export class UmbTiptapToolbarElement extends UmbLitElement {
 			[],
 			(manifest) => this.toolbar.flat(2).includes(manifest.alias),
 			(extensionControllers) => {
-				this._lookup = new Map(
-					extensionControllers.map((ext) => {
+				extensionControllers.forEach((ext) => {
+					if (!this.#lookup.has(ext.alias)) {
 						(ext.component as HTMLElement)?.setAttribute('data-mark', `action:tiptap-toolbar:${ext.alias}`);
-						return [ext.alias, ext.component];
-					}),
-				);
+						this.#lookup.set(ext.alias, ext.component);
+						this.#debouncer();
+					}
+				});
 			},
 			undefined,
 			undefined,
@@ -76,18 +80,23 @@ export class UmbTiptapToolbarElement extends UmbLitElement {
 
 	override render() {
 		if (!this.toolbar.flat(2).length) return nothing;
+		return this.#renderRows(this.toolbar);
+	}
 
-		return map(
-			this.toolbar,
-			(row) => html`
-				<div class="row">
-					${map(
-						row,
-						(group) => html`<div class="group">${map(group, (alias) => this._lookup?.get(alias) ?? nothing)}</div>`,
-					)}
-				</div>
-			`,
-		);
+	#renderRows(rows: UmbTiptapToolbarValue) {
+		return repeat(rows, (row) => html`<div class="row">${this.#renderGroups(row)}</div>`);
+	}
+
+	#renderGroups(groups: Array<Array<string>>) {
+		return repeat(groups, (group) => html`<div class="group">${this.#renderActions(group)}</div>`);
+	}
+
+	#renderActions(aliases: Array<string>) {
+		return repeat(aliases, (alias) => this.#lookup?.get(alias) ?? this.#renderActionPlaceholder());
+	}
+
+	#renderActionPlaceholder() {
+		return html`<span class="skeleton" role="none"></span>`;
 	}
 
 	static override readonly styles = css`
@@ -105,6 +114,7 @@ export class UmbTiptapToolbarElement extends UmbLitElement {
 			border-top-color: var(--umb-tiptap-edge-border-color, var(--uui-color-border));
 			border-left-color: var(--umb-tiptap-edge-border-color, var(--uui-color-border));
 			border-right-color: var(--umb-tiptap-edge-border-color, var(--uui-color-border));
+			box-sizing: border-box;
 
 			background-color: var(--uui-color-surface);
 			color: var(--color-text);
@@ -114,7 +124,7 @@ export class UmbTiptapToolbarElement extends UmbLitElement {
 			flex-direction: column;
 
 			position: sticky;
-			top: var(--umb-tiptap-top,-25px);
+			top: var(--umb-tiptap-top, -25px);
 			left: 0;
 			right: 0;
 			padding: var(--uui-size-3);
@@ -130,21 +140,32 @@ export class UmbTiptapToolbarElement extends UmbLitElement {
 			flex-direction: row;
 			flex-wrap: wrap;
 
+			min-height: var(--uui-size-12, 36px);
+
 			.group {
 				display: inline-flex;
 				flex-wrap: wrap;
 				align-items: stretch;
 
+				min-height: var(--uui-size-12, 36px);
+
 				&:not(:last-child)::after {
 					content: '';
 					background-color: var(--uui-color-border);
 					width: 1px;
 					place-self: center;
-					height: 22px;
+					height: var(--uui-size-7, 21px);
 					margin: 0 var(--uui-size-3);
 				}
 			}
 		}
+
+		.skeleton {
+			background-color: var(--uui-color-background);
+			height: var(--uui-size-12, 36px);
+			width: var(--uui-size-10, 30px);
+			margin-left: 1px;
+		}
 	`;
 }