echarts-5.5.0-rc.2/src/util/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.
*/

import Element from 'zrender/src/Element';

export function findEventDispatcher(
    target: Element,
    det: (target: Element) => boolean,
    returnFirstMatch?: boolean
) {
    let found;
    while (target) {
        if (det(target)) {
            found = target;
            if (returnFirstMatch) {
                break;
            }
        }

        target = target.__hostTarget || target.parent;
    }
    return found;
}