[REF] initial prototype of owl 2

src/blockdom/events.ts

@@ -0,0 +1,32 @@
+import { config } from "./config";
+
+export function createEventHandler(event: string) {
+  setupSyntheticEvent(event);
+  const key = `__event__${event}`;
+  return function setupHandler(this: HTMLElement, data: any) {
+    (this as any)[key] = data;
+  };
+}
+
+function nativeToSyntheticEvent(event: Event, name: string) {
+  const eventKey = `__event__${name}`;
+  let dom = event.target;
+  while (dom !== null) {
+    const data = (dom as any)[eventKey];
+    if (data) {
+      config.mainEventHandler(data, event);
+      return;
+    }
+    dom = (dom as any).parentNode;
+  }
+}
+
+const CONFIGURED_SYNTHETIC_EVENTS: { [event: string]: boolean } = {};
+
+function setupSyntheticEvent(name: string) {
+  if (CONFIGURED_SYNTHETIC_EVENTS[name]) {
+    return;
+  }
+  document.addEventListener(name, (event) => nativeToSyntheticEvent(event, name));
+  CONFIGURED_SYNTHETIC_EVENTS[name] = true;
+}