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Set event.composed and event.composedPath() for shadow DOM #98

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Set event.composed and event.composedPath() for shadow DOM #98

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14 changes: 14 additions & 0 deletions ts/drag-drop-touch-util.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ export function newForwardableEvent(
const evt = new Event(type, {
bubbles: true,
cancelable: true,
composed: target.shadowRoot?.mode === "open",
}) as unknown as Mutable<MouseEvent, "button" | "which" | "buttons"> & {
readonly defaultPrevented: boolean;
},
Expand All @@ -68,6 +69,19 @@ export function newForwardableEvent(
copyProps(evt, srcEvent, _kbdProps);
copyProps(evt, touch, _ptProps);
setOffsetAndLayerProps(evt, target);
// set composedPath for shadow DOM
if (evt.composed) {
evt.composedPath = () => {
const pt = pointFrom(srcEvent);
const el = target.shadowRoot?.elementFromPoint(pt.x, pt.y);
const getPath = (e?: Element | null, path: Element[] = []) => {
if (!e) return path;
path.unshift(e);
return getPath(e.parentElement, path);
};
return getPath(el);
};
}
return evt;
}

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