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import { all_registered_events, root_event_handles } from '../../render.js';
import { define_property, is_array } from '../../utils.js';
/**
* @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 };
/**
* @this {EventTarget}
*/
function target_handler(/** @type {Event} */ event) {
if (!capture) {
// Only call in the bubble phase, else delegated events would be called before the capturing events
handle_event_propagation(dom, event);
}
if (!event.cancelBubble) {
return handler.call(this, event);
}
}
dom.addEventListener(event_name, target_handler, options);
// @ts-ignore
if (dom === document.body || dom === window || dom === document) {
render_effect(() => {
return () => {
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);
}
}
/**
* @param {Node} handler_element
* @param {Event} event
* @returns {void}
*/
export function handle_event_propagation(handler_element, event) {
var owner_document = handler_element.ownerDocument;
var event_name = event.type;
var path = event.composedPath?.() || [];
var current_target = /** @type {null | Element} */ (path[0] || event.target);
if (event.target !== current_target) {
define_property(event, 'target', {
configurable: true,
value: current_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) {
// +1 because at_idx is the element which was already handled, and there can only be one delegated event per element.
// Avoids on:click and onclick on the same event resulting in onclick being fired twice.
path_idx = at_idx + 1;
}
}
current_target = /** @type {Element} */ (path[path_idx] || event.target);
// Proxy currentTarget to correct target
define_property(event, 'currentTarget', {
configurable: true,
get() {
return current_target || owner_document;
}
});
/** @param {Element} next_target */
function next(next_target) {
current_target = next_target;
/** @type {null | Element} */
var parent_element = next_target.parentNode || /** @type {any} */ (next_target).host || null;
try {
// @ts-expect-error
var delegated = next_target['__' + event_name];
if (delegated !== undefined && !(/** @type {any} */ (next_target).disabled)) {
if (is_array(delegated)) {
var [fn, ...data] = delegated;
fn.apply(next_target, [event, ...data]);
} else {
delegated.call(next_target, event);
}
}
} finally {
if (
!event.cancelBubble &&
parent_element !== handler_element &&
parent_element !== null &&
next_target !== handler_element
) {
next(parent_element);
}
}
}
try {
next(current_target);
} finally {
// @ts-expect-error is used above
event.__root = handler_element;
// @ts-expect-error is used above
current_target = handler_element;
}
}
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