///
/// Copyright 2015-2026 Micro Focus or one of its affiliates.
///
/// Licensed 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 { Injectable } from '@angular/core';

@Injectable()
export class ScrollIntoViewService {
  scrollIntoView(elem: HTMLElement, scrollParent: HTMLElement) {
    const offsetTop =
      elem.getBoundingClientRect().top +
      scrollParent.scrollTop -
      scrollParent.getBoundingClientRect().top;
    if (offsetTop < scrollParent.scrollTop) {
      scrollParent.scrollTop = offsetTop;
    } else {
      const offsetBottom = offsetTop + elem.offsetHeight;
      if (offsetBottom > scrollParent.scrollTop + scrollParent.clientHeight) {
        scrollParent.scrollTop = offsetBottom - scrollParent.clientHeight;
      }
    }
  }
}