alfresco-ng2-components/demo-shell/src/app/components/theme-picker/theme-storage/theme-storage.ts

/*!
 * @license
 * Copyright 2019 Alfresco Software, Ltd.
 *
 * 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 { EventEmitter, Injectable } from '@angular/core';

export interface DocsSiteTheme {
  href: string;
  name: string;
  accent: string;
  primary: string;
  isDark?: boolean;
  isDefault?: boolean;
}

@Injectable({ providedIn: 'root' })
export class ThemeStorage {
  static storageKey = 'docs-theme-storage-current';

  onThemeUpdate = new EventEmitter<DocsSiteTheme>();

  storeTheme(theme: DocsSiteTheme) {
    try {
      window.localStorage[ThemeStorage.storageKey] = JSON.stringify(theme);
    } catch (e) { }

    this.onThemeUpdate.emit(theme);
  }

  getStoredTheme(): DocsSiteTheme {
    try {
      return JSON.parse(window.localStorage[ThemeStorage.storageKey] || null);
    } catch (e) {
      return null;
    }
  }

  clearStorage() {
    try {
      window.localStorage.removeItem(ThemeStorage.storageKey);
    } catch (e) { }
  }
}