fix: carousel app component, expose current index (#6120)

* feat: carousel app component, expose current index

* minimal diff

frontend/src/lib/components/apps/components/display/AppCarouselList.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { getContext } from 'svelte'
+	import { getContext, untrack } from 'svelte'
 	import { initConfig, initOutput } from '../../editor/appUtils'
 	import SubGridEditor from '../../editor/SubGridEditor.svelte'
 	import type { AppViewerContext, ComponentCustomCSS, RichConfigurations } from '../../types'
@@ -36,7 +36,7 @@
 		componentContainerHeight
 	}: Props = $props()
 
-	const { app, focusedGrid, selectedComponent, worldStore, connectingInput } =
+	const { app, focusedGrid, selectedComponent, worldStore, connectingInput, componentControl } =
 		getContext<AppViewerContext>('AppViewerContext')
 
 	let everRender = $state(render)
@@ -44,10 +44,11 @@
 		render && !everRender && (everRender = true)
 	})
 
-	const outputs = initOutput($worldStore, id, {
+	let outputs = initOutput($worldStore, id, {
 		result: undefined,
 		loading: false,
-		inputs: {}
+		inputs: {},
+		currentIndex: 0
 	})
 
 	const resolvedConfig = $state(
@@ -76,6 +77,41 @@
 			})
 	})
 	let currentPageIndex = $state(0)
+
+	// Single update function - ONLY place that calls .set()
+	function handleIndexChange() {
+		if (outputs?.currentIndex) {
+			if (!Array.isArray(result) || result.length === 0) {
+				// No data or empty data - reset to 0
+				currentPageIndex = 0
+				outputs.currentIndex.set(0)
+			} else if (currentPageIndex >= result.length) {
+				// Current index is out of bounds - reset to 0
+				currentPageIndex = 0
+				outputs.currentIndex.set(0)
+			} else {
+				// Valid data and valid current index
+				outputs.currentIndex.set(currentPageIndex)
+				// Navigate carousel to match the current index
+				if (carousel) {
+					carousel.goTo(currentPageIndex)
+				}
+			}
+		}
+	}
+
+	// Watch for changes and call update function (like working components)
+	$effect.pre(() => {
+		currentPageIndex != undefined && untrack(() => handleIndexChange())
+	})
+
+	$componentControl[id] = {
+		setSelectedIndex: (index: number) => {
+			if (Array.isArray(result) && index >= 0 && index < result.length) {
+				currentPageIndex = index
+			}
+		}
+	}
 </script>
 
 {#each Object.keys(components['carousellistcomponent'].initialData.configuration) as key (key)}

frontend/src/lib/components/apps/editor/appUtils.ts

@@ -1319,6 +1319,7 @@ export function isContainer(type: string): boolean {
 		type === 'horizontalsplitpanescomponent' ||
 		type === 'steppercomponent' ||
 		type === 'listcomponent' ||
+		type === 'carousellistcomponent' ||
 		type === 'decisiontreecomponent'
 	)
 }
@@ -1336,6 +1337,9 @@ export function subGridIndexKey(type: string | undefined, id: string, world: Wor
 		case 'steppercomponent': {
 			return (world?.outputsById?.[id]?.currentStepIndex?.peak() as number) ?? 0
 		}
+		case 'carousellistcomponent': {
+			return (world?.outputsById?.[id]?.currentIndex?.peak() as number) ?? 0
+		}
 		case 'decisiontreecomponent': {
 			return (world?.outputsById?.[id]?.currentNodeIndex?.peak() as number) ?? 0
 		}

frontend/src/lib/components/apps/editor/componentsPanel/componentControlUtils.ts

@@ -38,7 +38,8 @@ const setValue = {
 
 const setSelectedIndex = {
 	title: 'setSelectedIndex',
-	description: 'Use the setSelectedIndex function to select a row in a table or an AG Grid table.',
+	description:
+		'Use the setSelectedIndex function to select a row in a table, an AG Grid table, or navigate to a slide in a Carousel component.',
 	example: 'setSelectedIndex(id: string, index: number)',
 	documentation: 'https://www.windmill.dev/docs/apps/app-runnable-panel#setselectedindex'
 }
@@ -90,6 +91,8 @@ export function getComponentControl(type: keyof typeof components): Array<Compon
 			return [setTab, setValue, setSelectedIndex]
 		case 'selecttabcomponent':
 			return [setTab, setValue, setSelectedIndex]
+		case 'carousellistcomponent':
+			return [setSelectedIndex]
 		case 'conditionalwrapper':
 		case 'steppercomponent':
 			return [setTab]

frontend/src/lib/components/apps/editor/settingsPanel/ComponentPanelDataSource.svelte

@@ -20,8 +20,6 @@
 	let { component = $bindable(), children }: Props = $props()
 	let convertToUIEditorCallback: (() => void) | undefined = $state(undefined)
 
-	console.log('FOOBAR', component.type)
-
 	let selected = $state(
 		(component.type === 'plotlycomponentv2' || component.type === 'chartjscomponentv2') &&
 			component.datasets !== undefined