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import { createControllerHost } from '../core/host';
import { createDisposableScope } from '../core/disposables';
import type {
ChangeDetails,
ControllableValueOptions,
RuntimeController,
RuntimeEventSource,
Unsubscribe,
} from '../core/types';
import {
eventTargets,
inertSiblings,
isHTMLElement,
listen,
lockDocumentScroll,
observeDocumentInteraction,
} from '../dom/dom';
import { focusInitial, restoreFocus, trapFocus } from '../focus/focus';
import { createControllableValue } from '../state/controllable';
import {
autoUpdatePosition,
calculatePosition,
type FloatingPositionOptions,
type PositionResult,
type VirtualAnchor,
} from '../positioning/positioning';
/** Cause union shared by dialog, popover, menus, and navigation overlays. @public */
export type OpenChangeReason =
| 'programmatic'
| 'trigger'
| 'escape-key'
| 'outside-pointer'
| 'focus-out'
| 'selection'
| 'context-menu'
| 'keyboard'
| 'hover'
| 'focus';
/** Payload emitted before and after an overlay open-state transition. @public */
export interface OpenChangeEvent<TReason extends OpenChangeReason = OpenChangeReason> {
/** Requested next state. */
readonly open: boolean;
/** Typed cause and optional native event. */
readonly details: ChangeDetails<TReason>;
}
/** Lifecycle events consistently emitted by openable controllers. @public */
export interface OpenLifecycleEvents<TReason extends OpenChangeReason = OpenChangeReason> {
/** Cancellable event emitted before opening. */
readonly beforeOpen: OpenChangeEvent<TReason>;
/** Event emitted after the open snapshot is published. */
readonly open: OpenChangeEvent<TReason>;
/** Event emitted after opening resources and focus are established. */
readonly afterOpen: OpenChangeEvent<TReason>;
/** Cancellable event emitted before closing. */
readonly beforeClose: OpenChangeEvent<TReason>;
/** Event emitted after the closed snapshot is published. */
readonly close: OpenChangeEvent<TReason>;
/** Event emitted after resources are released and focus restoration is attempted. */
readonly afterClose: OpenChangeEvent<TReason>;
/** Event emitted for every accepted open-state mutation. */
readonly stateChange: OpenChangeEvent<TReason>;
}
/** DOM elements bound to an overlay controller. @public */
export interface OverlayElements {
/** Optional trigger or focus restoration target. */
readonly trigger?: HTMLElement;
/** Floating dialog, popover, or menu element. */
readonly content: HTMLElement;
/** Optional backdrop treated as an outside-interaction target. */
readonly backdrop?: HTMLElement;
/** Optional positioned anchor; defaults to `trigger`. */
readonly anchor?: Element | VirtualAnchor;
/** Descendant overlay branches that remain inside this overlay. */
readonly branches?: readonly Element[];
}
/** Immutable shared snapshot for openable components. @public */
export interface OpenSnapshot {
/** Current externally observable open state. */
readonly open: boolean;
/** Whether state ownership belongs to the consumer. */
readonly controlled: boolean;
/** Whether this overlay is the topmost overlay in its owner document. */
readonly topmost: boolean;
/** Stable content ID used by trigger relationships. */
readonly contentId: string;
/** Semantic role for consumer-rendered content. */
readonly role: string;
/** Latest calculated coordinates, or `null` before positioning. */
readonly position: PositionResult | null;
}
/** Shared options used by overlay-style component factories. @internal */
export interface OpenControllerOptions extends Partial<
ControllableValueOptions<boolean, OpenChangeReason>
> {
/** Consumer-provided deterministic content ID. */
readonly id?: string;
/** WAI-ARIA role exposed in the snapshot. */
readonly role: string;
/** Whether opening traps focus, locks scroll, and inerts siblings. */
readonly modal?: boolean;
/** Whether Escape closes the topmost overlay. @defaultValue `true` */
readonly closeOnEscape?: boolean;
/** Whether outside pointer interactions close the overlay. @defaultValue `true` */
readonly closeOnOutsidePointer?: boolean;
/** Whether focus leaving all overlay branches closes it. @defaultValue `false` */
readonly closeOnFocusOutside?: boolean;
/** Whether keyboard focus is contained while open. */
readonly trapFocus?: boolean;
/** Whether the pre-open focus target is restored on close. */
readonly restoreFocus?: boolean;
/** Preferred initial focus target resolved after binding. */
readonly initialFocus?: () => HTMLElement | null;
/** Whether opening moves focus into content. Defaults to modal/trapping overlays. */
readonly focusOnOpen?: boolean;
/** Whether pointer/focus-out dismissal restores the pre-open target. */
readonly restoreFocusOnOutside?: boolean;
/** Shared anchored positioning options. */
readonly positioning?: FloatingPositionOptions;
}
/** Internal overlay primitive reused by all public overlay controllers. @internal */
export interface OpenController
extends RuntimeController<OpenSnapshot>, RuntimeEventSource<OpenLifecycleEvents> {
open(details: ChangeDetails<OpenChangeReason>): void;
close(details: ChangeDetails<OpenChangeReason>): void;
toggle(details: ChangeDetails<OpenChangeReason>): void;
bind(elements: OverlayElements): () => void;
updatePosition(): void;
}
interface StackEntry {
readonly id: string;
readonly content: HTMLElement;
readonly interactionBoundaries: readonly Element[];
readonly focusScopes: readonly Element[];
readonly inertBranches: readonly Element[];
readonly trapsFocus: boolean;
readonly modal: boolean;
readonly order: number;
handleEscape(event: KeyboardEvent): void;
handlePointerOutside(event: PointerEvent): void;
handleFocusOutside(event: FocusEvent): void;
setFocusTrap(scopes: readonly Element[] | undefined): void;
setInertScope(branches: readonly Element[] | undefined): void;
publish(topmost: boolean): void;
}
const overlayStacks = new WeakMap<Document, StackEntry[]>();
const overlayStackOrders = new WeakMap<Document, number>();
const overlayReconcileQueue = new Set<Document>();
let overlayMutationDepth = 0;
let flushingOverlayReconcileQueue = false;
const sameElements = (
left: readonly Element[] | undefined,
right: readonly Element[] | undefined,
): boolean =>
left === right ||
(left !== undefined &&
right !== undefined &&
left.length === right.length &&
left.every((element, index) => element === right[index]));
const uniqueElements = (elements: readonly Element[]): readonly Element[] => [...new Set(elements)];
const stackMatches = (ownerDocument: Document, expected: readonly StackEntry[]): boolean => {
const current = overlayStacks.get(ownerDocument) ?? [];
return (
current.length === expected.length && current.every((entry, index) => entry === expected[index])
);
};
const reconcileOverlayDocument = (ownerDocument: Document): void => {
const stack = [...(overlayStacks.get(ownerDocument) ?? [])];
if (stack.length === 0) return;
let focusOwnerIndex = -1;
let modalOwnerIndex = -1;
let index = stack.length;
for (const entry of [...stack].reverse()) {
index -= 1;
if (focusOwnerIndex < 0 && entry.trapsFocus) focusOwnerIndex = index;
if (modalOwnerIndex < 0 && entry.modal) modalOwnerIndex = index;
if (focusOwnerIndex >= 0 && modalOwnerIndex >= 0) break;
}
const focusOwner = stack[focusOwnerIndex];
if (focusOwner) {
focusOwner.setFocusTrap(
uniqueElements([
...focusOwner.focusScopes,
...stack.slice(focusOwnerIndex + 1).flatMap((entry) => entry.focusScopes),
]),
);
}
const modalOwner = stack[modalOwnerIndex];
if (modalOwner) {
modalOwner.setInertScope(
uniqueElements([
...modalOwner.inertBranches,
...stack.slice(modalOwnerIndex + 1).flatMap((entry) => entry.focusScopes),
]),
);
}
for (const entry of stack) {
if (entry !== focusOwner) entry.setFocusTrap(undefined);
if (entry !== modalOwner) entry.setInertScope(undefined);
}
Iif (!stackMatches(ownerDocument, stack)) {
overlayReconcileQueue.add(ownerDocument);
return;
}
for (const [index, entry] of stack.entries()) {
entry.publish(index === stack.length - 1);
if (!stackMatches(ownerDocument, stack)) {
overlayReconcileQueue.add(ownerDocument);
return;
}
}
};
const flushOverlayReconcileQueue = (): void => {
if (overlayMutationDepth > 0 || flushingOverlayReconcileQueue) return;
flushingOverlayReconcileQueue = true;
try {
while (overlayReconcileQueue.size > 0) {
for (const ownerDocument of overlayReconcileQueue) {
overlayReconcileQueue.delete(ownerDocument);
reconcileOverlayDocument(ownerDocument);
break;
}
}
} finally {
flushingOverlayReconcileQueue = false;
}
};
const requestOverlayReconcile = (ownerDocument: Document): void => {
overlayReconcileQueue.add(ownerDocument);
flushOverlayReconcileQueue();
};
const beginOverlayMutation = (): void => {
overlayMutationDepth += 1;
};
const endOverlayMutation = (): void => {
overlayMutationDepth -= 1;
flushOverlayReconcileQueue();
};
interface OverlayDocumentDispatcher {
count: number;
readonly release: Unsubscribe;
}
const overlayDocumentDispatchers = new WeakMap<Document, OverlayDocumentDispatcher>();
const acquireOverlayDocumentDispatcher = (ownerDocument: Document): Unsubscribe => {
const current = overlayDocumentDispatchers.get(ownerDocument);
if (current) {
current.count += 1;
} else {
const releaseInteractions = observeDocumentInteraction({
ownerDocument,
onPointerDown(event) {
const topmost = overlayStacks.get(ownerDocument)?.at(-1);
if (
!topmost ||
topmost.interactionBoundaries.some((boundary) => eventTargets(event, boundary))
)
return;
topmost.handlePointerOutside(event);
},
onFocusIn(event) {
const topmost = overlayStacks.get(ownerDocument)?.at(-1);
if (
!topmost ||
topmost.interactionBoundaries.some((boundary) => eventTargets(event, boundary))
)
return;
topmost.handleFocusOutside(event);
},
});
const releaseEscape = listen<KeyboardEvent>(
ownerDocument,
'keydown',
(event) => {
if (event.key === 'Escape') overlayStacks.get(ownerDocument)?.at(-1)?.handleEscape(event);
},
true,
);
overlayDocumentDispatchers.set(ownerDocument, {
count: 1,
release() {
releaseEscape();
releaseInteractions();
},
});
}
let active = true;
return () => {
Iif (!active) return;
active = false;
const dispatcher = overlayDocumentDispatchers.get(ownerDocument);
Iif (!dispatcher) return;
dispatcher.count -= 1;
if (dispatcher.count === 0) {
dispatcher.release();
overlayDocumentDispatchers.delete(ownerDocument);
}
};
};
const details = <TReason extends OpenChangeReason>(
reason: TReason,
event: Event,
): ChangeDetails<TReason> => ({ reason, event });
export function createOpenController(options: OpenControllerOptions): OpenController {
const id = options.id ?? createRuntimeId(options.role);
const controlled = options.getValue !== undefined;
const initialOpen = options.getValue?.() ?? options.defaultValue ?? false;
const host = createControllerHost<OpenSnapshot, OpenLifecycleEvents>({
open: initialOpen,
controlled,
topmost: false,
contentId: id,
role: options.role,
position: null,
});
interface BindingRegistration {
readonly elements: OverlayElements;
readonly token: symbol;
}
let binding: BindingRegistration | undefined;
let openResources = createDisposableScope();
let restoreTarget: HTMLElement | null = null;
let restoreTargetCaptured = false;
let activeEntry: StackEntry | undefined;
let sessionDocument: Document | undefined;
let sessionOrder: number | undefined;
let currentPosition: PositionResult | null = null;
let resourceGeneration = 0;
let transitionGeneration = 0;
let lifecycleRequestInFlight: boolean | undefined;
const refreshSnapshot = (topmost?: boolean): void => {
const open = state.get();
const currentBinding = binding;
const stack = currentBinding
? overlayStacks.get(currentBinding.elements.content.ownerDocument)
: undefined;
const resolvedTopmost =
open && (topmost ?? (activeEntry !== undefined && stack?.at(-1) === activeEntry));
const current = host.getSnapshot();
if (
current.open === open &&
current.topmost === resolvedTopmost &&
current.position === currentPosition
)
return;
host.update({
...current,
open,
topmost: resolvedTopmost,
position: currentPosition,
});
};
const state = createControllableValue<boolean, OpenChangeReason>(
{
defaultValue: options.defaultValue ?? false,
...(options.getValue ? { getValue: options.getValue } : {}),
...(options.onValueChange ? { onValueChange: options.onValueChange } : {}),
...(options.subscribeValue ? { subscribeValue: options.subscribeValue } : {}),
},
(open, changeDetails) => commit(open, changeDetails),
);
const calculateBoundPosition = (currentBinding: BindingRegistration): PositionResult | null => {
const { content } = currentBinding.elements;
const anchor = currentBinding.elements.anchor ?? currentBinding.elements.trigger;
Iif (!anchor) return null;
const rectangle = anchor.getBoundingClientRect();
const floating = content.getBoundingClientRect();
const ownerWindow = content.ownerDocument.defaultView;
const viewportWidth = options.positioning?.viewportWidth ?? ownerWindow?.innerWidth;
const viewportHeight = options.positioning?.viewportHeight ?? ownerWindow?.innerHeight;
return calculatePosition(
rectangle,
{ width: floating.width, height: floating.height },
{
...options.positioning,
...(viewportWidth !== undefined ? { viewportWidth } : {}),
...(viewportHeight !== undefined ? { viewportHeight } : {}),
},
);
};
const updatePositionFor = (currentBinding: BindingRegistration, generation: number): void => {
Iif (resourceGeneration !== generation || binding !== currentBinding || !state.get()) return;
const position = calculateBoundPosition(currentBinding);
Iif (resourceGeneration !== generation || binding !== currentBinding || !state.get()) return;
currentPosition = position;
refreshSnapshot();
};
const updatePosition = (): void => {
const currentBinding = binding;
if (!currentBinding) return;
updatePositionFor(currentBinding, resourceGeneration);
};
const syncResources = (): void => {
resourceGeneration += 1;
const generation = resourceGeneration;
const currentBinding = binding;
const previousResources = openResources;
const localResources = createDisposableScope();
openResources = localResources;
currentPosition = null;
let createdEntry: StackEntry | undefined;
let establishingSessionBinding = false;
const isCurrent = (): boolean =>
host.alive() &&
resourceGeneration === generation &&
openResources === localResources &&
binding === currentBinding;
const isCurrentOpen = (): boolean => isCurrent() && state.get();
beginOverlayMutation();
try {
previousResources.dispose();
if (isCurrentOpen() && currentBinding) {
const { content, trigger, backdrop, anchor, branches = [] } = currentBinding.elements;
const ownerDocument = content.ownerDocument;
let activeSessionOrder = sessionOrder;
if (sessionDocument !== ownerDocument || activeSessionOrder === undefined) {
const order = (overlayStackOrders.get(ownerDocument) ?? 0) + 1;
overlayStackOrders.set(ownerDocument, order);
sessionDocument = ownerDocument;
sessionOrder = order;
activeSessionOrder = order;
restoreTarget = null;
restoreTargetCaptured = false;
}
establishingSessionBinding = !restoreTargetCaptured;
if (establishingSessionBinding) {
restoreTarget =
trigger ??
(isHTMLElement(ownerDocument.activeElement, ownerDocument)
? ownerDocument.activeElement
: null);
restoreTargetCaptured = true;
} else if (!restoreTarget?.isConnected && trigger?.isConnected) {
restoreTarget = trigger;
}
const focusScopes = uniqueElements(
[content, ...branches].filter((scope) => scope.ownerDocument === ownerDocument),
);
const interactionBoundaries = uniqueElements(
[content, trigger, ...branches].filter(
(boundary): boundary is Element =>
boundary !== undefined && boundary.ownerDocument === ownerDocument,
),
);
const inertBranches = uniqueElements(
[backdrop, ...branches].filter(
(branch): branch is Element =>
branch !== undefined && branch.ownerDocument === ownerDocument,
),
);
let installedFocusScopes: readonly Element[] | undefined;
let installedInertBranches: readonly Element[] | undefined;
let releaseFocusTrap: Unsubscribe = () => undefined;
let releaseInertScope: Unsubscribe = () => undefined;
localResources.add(() => {
releaseFocusTrap();
releaseFocusTrap = () => undefined;
installedFocusScopes = undefined;
});
localResources.add(() => {
releaseInertScope();
releaseInertScope = () => undefined;
installedInertBranches = undefined;
});
const entry: StackEntry = {
id,
content,
interactionBoundaries,
focusScopes,
inertBranches,
trapsFocus: options.trapFocus ?? options.modal ?? false,
modal: options.modal ?? false,
order: activeSessionOrder,
handleEscape(event) {
if (!isCurrentOpen() || activeEntry !== entry || !(options.closeOnEscape ?? true))
return;
event.preventDefault();
change(false, details('escape-key', event));
},
handlePointerOutside(event) {
if (
!isCurrentOpen() ||
activeEntry !== entry ||
!(options.closeOnOutsidePointer ?? true)
)
return;
change(false, details('outside-pointer', event));
},
handleFocusOutside(event) {
if (!isCurrentOpen() || activeEntry !== entry || !options.closeOnFocusOutside) return;
change(false, details('focus-out', event));
},
setFocusTrap(scopes) {
Iif (!isCurrentOpen() || activeEntry !== entry) return;
if (sameElements(installedFocusScopes, scopes)) return;
const nextRelease = scopes
? trapFocus(
content,
scopes.filter((scope) => scope !== content),
)
: () => undefined;
const previousRelease = releaseFocusTrap;
releaseFocusTrap = nextRelease;
installedFocusScopes = scopes;
previousRelease();
},
setInertScope(nextBranches) {
Iif (!isCurrentOpen() || activeEntry !== entry) return;
if (sameElements(installedInertBranches, nextBranches)) return;
const nextRelease = nextBranches
? inertSiblings(
content,
nextBranches.filter((branch) => branch !== content),
activeSessionOrder,
)
: () => undefined;
const previousRelease = releaseInertScope;
releaseInertScope = nextRelease;
installedInertBranches = nextBranches;
previousRelease();
},
publish(topmost) {
Iif (!isCurrentOpen() || activeEntry !== entry) return;
refreshSnapshot(topmost);
},
};
createdEntry = entry;
activeEntry = entry;
const stack = overlayStacks.get(ownerDocument) ?? [];
const orderedIndex = stack.findIndex((candidate) => candidate.order > activeSessionOrder);
stack.splice(orderedIndex < 0 ? stack.length : orderedIndex, 0, entry);
overlayStacks.set(ownerDocument, stack);
localResources.add(() => {
const currentStack = overlayStacks.get(ownerDocument);
const index = currentStack?.indexOf(entry) ?? -1;
Eif (currentStack && index >= 0) currentStack.splice(index, 1);
if (currentStack?.length === 0) overlayStacks.delete(ownerDocument);
Eif (activeEntry === entry) activeEntry = undefined;
requestOverlayReconcile(ownerDocument);
});
localResources.add(acquireOverlayDocumentDispatcher(ownerDocument));
if (options.modal) localResources.add(lockDocumentScroll(ownerDocument));
const positionedAnchor = anchor ?? trigger;
if (positionedAnchor) {
let installing = true;
const releasePositioning = autoUpdatePosition(positionedAnchor, content, () => {
Eif (installing) return;
updatePositionFor(currentBinding, generation);
});
localResources.add(releasePositioning);
installing = false;
const position = calculateBoundPosition(currentBinding);
Eif (isCurrentOpen() && activeEntry === entry) currentPosition = position;
}
requestOverlayReconcile(ownerDocument);
}
} catch (error) {
localResources.dispose();
throw error;
} finally {
endOverlayMutation();
}
if (!isCurrent()) return;
refreshSnapshot();
if (!isCurrentOpen() || !currentBinding || !createdEntry || activeEntry !== createdEntry)
return;
const { content, branches = [] } = currentBinding.elements;
const stack = overlayStacks.get(content.ownerDocument);
const activeElement = content.ownerDocument.activeElement;
const focusWithinBinding = [content, ...branches].some(
(scope) =>
activeElement !== null && (scope === activeElement || scope.contains(activeElement)),
);
const shouldFocusBinding =
stack?.at(-1) === createdEntry && (establishingSessionBinding || !focusWithinBinding);
if (
shouldFocusBinding &&
(options.focusOnOpen ?? options.modal ?? options.trapFocus ?? false)
) {
const preferredFocus = options.initialFocus?.();
if (
!isCurrentOpen() ||
binding !== currentBinding ||
activeEntry !== createdEntry ||
overlayStacks.get(content.ownerDocument)?.at(-1) !== createdEntry
)
return;
focusInitial(content, preferredFocus, (cleanup) => localResources.add(cleanup));
Iif (!isCurrentOpen() || activeEntry !== createdEntry) return;
}
};
const commit = (open: boolean, changeDetails?: ChangeDetails<OpenChangeReason>): void => {
transitionGeneration += 1;
const generation = transitionGeneration;
const closingDocument = activeEntry?.content.ownerDocument ?? sessionDocument;
const closingOrder = activeEntry?.order ?? sessionOrder;
const stackBeforeClose =
!open && closingDocument ? overlayStacks.get(closingDocument) : undefined;
const hasHigherOverlay =
closingOrder !== undefined &&
(stackBeforeClose?.some(
(candidate) => candidate !== activeEntry && candidate.order > closingOrder,
) ??
false);
const closingRestoreTarget = restoreTarget;
const closingCurrentTrigger = binding?.elements.trigger;
if (open) {
restoreTarget = null;
restoreTargetCaptured = false;
sessionDocument = undefined;
sessionOrder = undefined;
}
syncResources();
const transitionIsCurrent = (): boolean =>
host.alive() && transitionGeneration === generation && state.get() === open;
if (!transitionIsCurrent()) return;
const payload = changeDetails ? { open, details: changeDetails } : undefined;
if (payload) {
host.emit(open ? 'open' : 'close', payload);
if (!transitionIsCurrent()) return;
host.emit('stateChange', payload);
Iif (!transitionIsCurrent()) return;
}
const dismissedOutside =
changeDetails?.reason === 'outside-pointer' || changeDetails?.reason === 'focus-out';
if (
!open &&
!hasHigherOverlay &&
(options.restoreFocus ?? true) &&
(!dismissedOutside || (options.restoreFocusOnOutside ?? options.modal ?? false))
) {
const restoredOriginal = restoreFocus(closingRestoreTarget);
if (!transitionIsCurrent()) return;
if (!restoredOriginal && closingCurrentTrigger !== closingRestoreTarget) {
restoreFocus(closingCurrentTrigger);
Iif (!transitionIsCurrent()) return;
}
}
if (payload) {
host.emit(open ? 'afterOpen' : 'afterClose', payload);
Iif (!transitionIsCurrent()) return;
}
if (!open) {
restoreTarget = null;
restoreTargetCaptured = false;
sessionDocument = undefined;
sessionOrder = undefined;
}
};
const change = (open: boolean, changeDetails: ChangeDetails<OpenChangeReason>): void => {
if (!host.alive() || state.get() === open || lifecycleRequestInFlight === open) return;
const payload = { open, details: changeDetails };
const generation = transitionGeneration;
lifecycleRequestInFlight = open;
try {
if (!host.emit(open ? 'beforeOpen' : 'beforeClose', payload)) return;
Iif (!host.alive() || transitionGeneration !== generation || state.get() === open) return;
if (state.set(open, changeDetails)) commit(open, changeDetails);
} finally {
if (lifecycleRequestInFlight === open) lifecycleRequestInFlight = undefined;
}
};
host.resources.add(() => state.destroy());
host.resources.add(() => openResources.dispose());
return {
getSnapshot: host.getSnapshot,
subscribe: host.subscribe,
on: host.on,
off: host.off,
once: host.once,
open: (changeDetails) => change(true, changeDetails),
close: (changeDetails) => change(false, changeDetails),
toggle: (changeDetails) => change(!state.get(), changeDetails),
bind(elements) {
if (!host.alive()) return () => undefined;
const registration: BindingRegistration = {
elements,
token: Symbol('overlay-binding'),
};
binding = registration;
syncResources();
let active = true;
return () => {
if (!active) return;
active = false;
if (binding !== registration) return;
binding = undefined;
syncResources();
};
},
updatePosition,
destroy() {
Iif (!host.alive()) return;
transitionGeneration += 1;
resourceGeneration += 1;
binding = undefined;
beginOverlayMutation();
try {
host.destroy();
} finally {
endOverlayMutation();
}
activeEntry = undefined;
currentPosition = null;
restoreTarget = null;
restoreTargetCaptured = false;
sessionDocument = undefined;
sessionOrder = undefined;
},
};
}
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