ambari-logsearch-web/src/app/modules/shared/components/filter-dropdown/filter-dropdown.component.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 { Component, forwardRef, Input } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { DropdownButtonComponent } from '@modules/shared/components/dropdown-button/dropdown-button.component';
import { ListItem } from '@app/classes/list-item';

@Component({
  selector: 'filter-dropdown',
  templateUrl: '../dropdown-button/dropdown-button.component.html',
  styleUrls: ['../dropdown-button/dropdown-button.component.less'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => FilterDropdownComponent),
      multi: true
    }
  ]
})
export class FilterDropdownComponent extends DropdownButtonComponent implements ControlValueAccessor {
  private onChange;

  private _onChange(value) {
    if (this.onChange) {
      this.onChange(value);
    }
  }

  @Input()
  options: ListItem[] = [];

  updateSelection(updates: ListItem | ListItem[], callOnChange: boolean = true): boolean {
    const hasChange = super.updateSelection(updates);
    if (hasChange && callOnChange) {
      this._onChange(this.selection);
    }
    return hasChange;
  }

  hanldeOptionsChange() {
    super.hanldeOptionsChange();
    this._onChange(this.selection);
  }

  writeValue(items: ListItem[]) {
    this.selection = items ? (Array.isArray(items) ? items : [items]) : [];
  }

  registerOnChange(callback: any): void {
    this.onChange = callback;
  }

  registerOnTouched() {}
}