owl/src/component/handler.ts

import { filterOutModifiersFromData } from "../blockdom/config";

export const mainEventHandler = (data: any, ev: Event, currentTarget?: EventTarget | null) => {
  const { data: _data, modifiers } = filterOutModifiersFromData(data);
  data = _data;
  let stopped = false;
  if (modifiers.length) {
    let selfMode = false;
    const isSelf = ev.target === currentTarget;
    for (const mod of modifiers) {
      switch (mod) {
        case "self":
          selfMode = true;
          if (isSelf) {
            continue;
          } else {
            return stopped;
          }
        case "prevent":
          if ((selfMode && isSelf) || !selfMode) ev.preventDefault();
          continue;
        case "stop":
          if ((selfMode && isSelf) || !selfMode) ev.stopPropagation();
          stopped = true;
          continue;
      }
    }
  }
  if (typeof data[0] === "function") {
    data[0](ev);
  } else if (data[0].__owl__) {
    const method = data[1];
    const args = data[2] || [];
    data[0].__owl__.component[method](...args, ev);
  }
  return stopped;
};