skywalking-booster-ui/src/utils/event.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const isServer = typeof window === "undefined";

function resizeHandler(entries: any[]): void {
  for (const entry of entries) {
    const listeners = entry.target.__resizeListeners__ || [];
    if (listeners.length) {
      listeners.forEach((fn: () => any) => {
        fn();
      });
    }
  }
}

export function addResizeListener(element: any, fn: () => unknown): void {
  if (isServer) return;
  if (!element.__resizeListeners__) {
    element.__resizeListeners__ = [];
    element.__ro__ = new ResizeObserver(resizeHandler);
    element.__ro__.observe(element);
  }
  element.__resizeListeners__.push(fn);
}

export function removeResizeListener(element: any, fn: () => unknown): void {
  if (!element || !element.__resizeListeners__) return;
  element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);
  if (!element.__resizeListeners__.length) {
    element.__ro__.disconnect();
  }
}

export function triggerWindowResize(): void {
  const event = document.createEvent("HTMLEvents");
  event.initEvent("resize", true, true);
  (event as any).eventType = "message";
  window.dispatchEvent(event);
}