dialog: allow disabling controls from rendering

src/lib/Dialog.svelte

@@ -41,24 +41,29 @@
 		title: (title: string) => void;
 	}
 
+	type DialogControlButton = {
+		label?: string;
+		class?: ClassValue;
+		action?: (dialog: DialogAPI) => void;
+	};
+
 	/**
 	 * Configures the default dialog controls.
 	 */
-	export type DialogControlOpts = {
-		cancel?: {
-			label?: string;
-			class?: ClassValue;
-			action?: (dialog: DialogAPI) => void;
-		};
-		ok?: {
-			label?: string;
-			class?: ClassValue;
-			action?: (dialog: DialogAPI) => void;
-		};
-		close?: {
-			class?: ClassValue;
-			action?: (dialog: DialogAPI) => void;
-		};
+	export type DialogControls = {
+		cancel?: DialogControlButton | null;
+		ok?: DialogControlButton | null;
+		close?: Omit<DialogControlButton, 'label'> | null;
+	};
+
+	const defaultDialogControls: DialogControls = {
+		cancel: {
+			label: 'Cancel'
+		},
+		ok: {
+			label: 'OK'
+		},
+		close: {}
 	};
 </script>
 
@@ -72,6 +77,7 @@
 	import { X } from 'phosphor-svelte';
 	import { ErrorMessage, type RawError } from './error';
 	import ErrorBox from './ErrorBox.svelte';
+	import { mergeOverrideObject } from './util';
 
 	interface Props {
 		open?: boolean;
@@ -80,7 +86,7 @@
 		size?: 'sm' | 'md' | 'lg' | 'max';
 		class?: ClassValue;
 		children?: Snippet;
-		controls?: Snippet | DialogControlOpts;
+		controls?: Snippet | DialogControls;
 		onopen?: (dialog: DialogAPI) => void;
 		onclose?: (dialog: DialogAPI) => void;
 		loading?: boolean;
@@ -95,7 +101,7 @@
 		size = 'sm',
 		class: classValue,
 		children,
-		controls,
+		controls: rawControls = defaultDialogControls,
 		onopen,
 		onclose,
 		loading = $bindable(false),
@@ -103,6 +109,12 @@
 		disabled = $bindable(false)
 	}: Props = $props();
 
+	let controls = $derived(
+		typeof rawControls === 'function'
+			? rawControls
+			: mergeOverrideObject(defaultDialogControls, rawControls)
+	);
+
 	let dialogContainer = $state<HTMLDivElement | null>(null);
 	let error = $state<ErrorMessage | null>(null);
 
@@ -192,49 +204,62 @@
 
 			{#if children}{@render children()}{:else}Dialog is empty{/if}
 
+			<!-- Dialog Controls -->
 			<div class="mt-6 flex justify-end gap-4">
 				{#if controls && typeof controls === 'function'}{@render controls()}{:else}
-					<Button
-						class={controls?.cancel?.class}
-						onclick={() => {
-							if (controls?.cancel?.action) {
-								controls.cancel.action(dialogAPI);
-							} else if (!frozen) {
-								open = false;
-							}
-						}}
-						disabled={frozen}
-					>
-						{controls?.cancel?.label || 'Cancel'}
-					</Button>
-					<Button
-						class={controls?.ok?.class}
-						onclick={() => {
-							if (controls?.ok?.action) {
-								controls.ok.action(dialogAPI);
-							} else if (!frozen && !loading && !disabled) {
-								open = false;
-							}
-						}}
-						disabled={frozen || loading || disabled}
-						{loading}
-					>
-						{controls?.ok?.label || 'OK'}
-					</Button>
+					{#if controls.cancel !== null}
+						<Button
+							class={controls?.cancel?.class}
+							onclick={() => {
+								if (controls?.cancel?.action) {
+									controls.cancel.action(dialogAPI);
+								} else if (!frozen) {
+									open = false;
+								}
+							}}
+							disabled={frozen}
+						>
+							{controls?.cancel?.label || 'Cancel'}
+						</Button>
+					{/if}
+					{#if controls.ok !== null}
+						<Button
+							class={controls?.ok?.class}
+							onclick={() => {
+								if (controls?.ok?.action) {
+									controls.ok.action(dialogAPI);
+								} else if (!frozen && !loading && !disabled) {
+									open = false;
+								}
+							}}
+							disabled={frozen || loading || disabled}
+							{loading}
+						>
+							{controls?.ok?.label || 'OK'}
+						</Button>
+					{/if}
 				{/if}
 			</div>
-			<button
-				type="button"
-				aria-label="close"
-				class="absolute top-4 right-4 inline-flex cursor-pointer items-center
+
+			<!-- Close Button -->
+			{#if typeof controls === 'function' || controls?.close !== null}
+				<button
+					type="button"
+					aria-label="close"
+					class="absolute top-4 right-4 inline-flex cursor-pointer items-center
 				justify-center disabled:cursor-not-allowed disabled:opacity-50"
-				onclick={() => {
-					if (!frozen) open = false;
-				}}
-				disabled={frozen}
-			>
-				<X size="1.5em" weight="bold" />
-			</button>
+					onclick={() => {
+						if (typeof controls !== 'function' && controls?.close?.action) {
+							controls?.close?.action?.(dialogAPI);
+						} else if (!frozen) {
+							open = false;
+						}
+					}}
+					disabled={frozen}
+				>
+					<X size="1.5em" weight="bold" />
+				</button>
+			{/if}
 		</div>
 	</div>
 {/snippet}

src/routes/+page.svelte

@@ -523,7 +523,8 @@
 				dialog.close();
 				alert('Dialog submitted!');
 			}
-		}
+		},
+		cancel: null
 	}}
 	onopen={(dialog) => {
 		dialog.error('Example error message!');