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import { teardown } from '../../reactivity/effects.js';
import { define_property, is_array } from '../../../shared/utils.js';
import { hydrating } from '../hydration.js';
import { queue_micro_task } from '../task.js';
import { FILENAME } from '../../../../constants.js';
import * as w from '../../warnings.js';
import {
active_effect,
active_reaction,
set_active_effect,
set_active_reaction
} from '../../runtime.js';
/** @type {Set<string>} */
export const all_registered_events = new Set();
/** @type {Set<(events: Array<string>) => void>} */
export const root_event_handles = new Set();
/**
* SSR adds onload and onerror attributes to catch those events before the hydration.
* This function detects those cases, removes the attributes and replays the events.
* @param {HTMLElement} dom
*/
export function replay_events(dom) {
if (!hydrating) return;
if (dom.onload) {
dom.removeAttribute('onload');
}
if (dom.onerror) {
dom.removeAttribute('onerror');
}
// @ts-expect-error
const event = dom.__e;
if (event !== undefined) {
// @ts-expect-error
dom.__e = undefined;
queueMicrotask(() => {
if (dom.isConnected) {
dom.dispatchEvent(event);
}
});
}
}
/**
* @param {string} event_name
* @param {EventTarget} dom
* @param {EventListener} handler
* @param {AddEventListenerOptions} options
*/
export function create_event(event_name, dom, handler, options) {
/**
* @this {EventTarget}
*/
function target_handler(/** @type {Event} */ event) {
if (!options.capture) {
// Only call in the bubble phase, else delegated events would be called before the capturing events
handle_event_propagation.call(dom, event);
}
if (!event.cancelBubble) {
var previous_reaction = active_reaction;
var previous_effect = active_effect;
set_active_reaction(null);
set_active_effect(null);
try {
return handler.call(this, event);
} finally {
set_active_reaction(previous_reaction);
set_active_effect(previous_effect);
}
}
}
// Chrome has a bug where pointer events don't work when attached to a DOM element that has been cloned
// with cloneNode() and the DOM element is disconnected from the document. To ensure the event works, we
// defer the attachment till after it's been appended to the document. TODO: remove this once Chrome fixes
// this bug. The same applies to wheel events and touch events.
if (
event_name.startsWith('pointer') ||
event_name.startsWith('touch') ||
event_name === 'wheel'
) {
queue_micro_task(() => {
dom.addEventListener(event_name, target_handler, options);
});
} else {
dom.addEventListener(event_name, target_handler, options);
}
return target_handler;
}
/**
* Attaches an event handler to an element and returns a function that removes the handler. Using this
* rather than `addEventListener` will preserve the correct order relative to handlers added declaratively
* (with attributes like `onclick`), which use event delegation for performance reasons
*
* @param {EventTarget} element
* @param {string} type
* @param {EventListener} handler
* @param {AddEventListenerOptions} [options]
*/
export function on(element, type, handler, options = {}) {
var target_handler = create_event(type, element, handler, options);
return () => {
element.removeEventListener(type, target_handler, options);
};
}
/**
* @param {string} event_name
* @param {Element} dom
* @param {EventListener} handler
* @param {boolean} capture
* @param {boolean} [passive]
* @returns {void}
*/
export function event(event_name, dom, handler, capture, passive) {
var options = { capture, passive };
var target_handler = create_event(event_name, dom, handler, options);
// @ts-ignore
if (dom === document.body || dom === window || dom === document) {
teardown(() => {
dom.removeEventListener(event_name, target_handler, options);
});
}
}
/**
* @param {Array<string>} events
* @returns {void}
*/
export function delegate(events) {
for (var i = 0; i < events.length; i++) {
all_registered_events.add(events[i]);
}
for (var fn of root_event_handles) {
fn(events);
}
}
/**
* @this {EventTarget}
* @param {Event} event
* @returns {void}
*/
export function handle_event_propagation(event) {
var handler_element = this;
var owner_document = /** @type {Node} */ (handler_element).ownerDocument;
var event_name = event.type;
var path = event.composedPath?.() || [];
var current_target = /** @type {null | Element} */ (path[0] || event.target);
// composedPath contains list of nodes the event has propagated through.
// We check __root to skip all nodes below it in case this is a
// parent of the __root node, which indicates that there's nested
// mounted apps. In this case we don't want to trigger events multiple times.
var path_idx = 0;
// @ts-expect-error is added below
var handled_at = event.__root;
if (handled_at) {
var at_idx = path.indexOf(handled_at);
if (
at_idx !== -1 &&
(handler_element === document || handler_element === /** @type {any} */ (window))
) {
// This is the fallback document listener or a window listener, but the event was already handled
// -> ignore, but set handle_at to document/window so that we're resetting the event
// chain in case someone manually dispatches the same event object again.
// @ts-expect-error
event.__root = handler_element;
return;
}
// We're deliberately not skipping if the index is higher, because
// someone could create an event programmatically and emit it multiple times,
// in which case we want to handle the whole propagation chain properly each time.
// (this will only be a false negative if the event is dispatched multiple times and
// the fallback document listener isn't reached in between, but that's super rare)
var handler_idx = path.indexOf(handler_element);
if (handler_idx === -1) {
// handle_idx can theoretically be -1 (happened in some JSDOM testing scenarios with an event listener on the window object)
// so guard against that, too, and assume that everything was handled at this point.
return;
}
if (at_idx <= handler_idx) {
path_idx = at_idx;
}
}
current_target = /** @type {Element} */ (path[path_idx] || event.target);
// there can only be one delegated event per element, and we either already handled the current target,
// or this is the very first target in the chain which has a non-delegated listener, in which case it's safe
// to handle a possible delegated event on it later (through the root delegation listener for example).
if (current_target === handler_element) return;
// Proxy currentTarget to correct target
define_property(event, 'currentTarget', {
configurable: true,
get() {
return current_target || owner_document;
}
});
// This started because of Chromium issue https://chromestatus.com/feature/5128696823545856,
// where removal or moving of of the DOM can cause sync `blur` events to fire, which can cause logic
// to run inside the current `active_reaction`, which isn't what we want at all. However, on reflection,
// it's probably best that all event handled by Svelte have this behaviour, as we don't really want
// an event handler to run in the context of another reaction or effect.
var previous_reaction = active_reaction;
var previous_effect = active_effect;
set_active_reaction(null);
set_active_effect(null);
try {
/**
* @type {unknown}
*/
var throw_error;
/**
* @type {unknown[]}
*/
var other_errors = [];
while (current_target !== null) {
/** @type {null | Element} */
var parent_element =
current_target.assignedSlot ||
current_target.parentNode ||
/** @type {any} */ (current_target).host ||
null;
try {
// @ts-expect-error
var delegated = current_target['__' + event_name];
if (delegated !== undefined && !(/** @type {any} */ (current_target).disabled)) {
if (is_array(delegated)) {
var [fn, ...data] = delegated;
fn.apply(current_target, [event, ...data]);
} else {
delegated.call(current_target, event);
}
}
} catch (error) {
if (throw_error) {
other_errors.push(error);
} else {
throw_error = error;
}
}
if (event.cancelBubble || parent_element === handler_element || parent_element === null) {
break;
}
current_target = parent_element;
}
if (throw_error) {
for (let error of other_errors) {
// Throw the rest of the errors, one-by-one on a microtask
queueMicrotask(() => {
throw error;
});
}
throw throw_error;
}
} finally {
// @ts-expect-error is used above
event.__root = handler_element;
// @ts-ignore remove proxy on currentTarget
delete event.currentTarget;
set_active_reaction(previous_reaction);
set_active_effect(previous_effect);
}
}
/**
* In dev, warn if an event handler is not a function, as it means the
* user probably called the handler or forgot to add a `() =>`
* @param {() => (event: Event, ...args: any) => void} thunk
* @param {EventTarget} element
* @param {[Event, ...any]} args
* @param {any} component
* @param {[number, number]} [loc]
* @param {boolean} [remove_parens]
*/
export function apply(
thunk,
element,
args,
component,
loc,
has_side_effects = false,
remove_parens = false
) {
let handler;
let error;
try {
handler = thunk();
} catch (e) {
error = e;
}
if (typeof handler === 'function') {
handler.apply(element, args);
} else if (has_side_effects || handler != null) {
const filename = component?.[FILENAME];
const location = loc ? ` at ${filename}:${loc[0]}:${loc[1]}` : ` in ${filename}`;
const event_name = args[0].type;
const description = `\`${event_name}\` handler${location}`;
const suggestion = remove_parens ? 'remove the trailing `()`' : 'add a leading `() =>`';
w.event_handler_invalid(description, suggestion);
if (error) {
throw error;
}
}
}
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