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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { Observable, of } from 'rxjs';
import { Theme } from './si-theme.model';
/**
* SiThemeStore object is used by the theme service to load and
* store the themes. You can inject your own implementation to provide
* a backend implementation. Otherwise a localStorage based implementation
* is used.
*/
export abstract class SiThemeStore {
/**
* Load and return an alternative custom theme, other then
* the default element theme. This method is invoked initially
* to check for an alternative custom theme.
* @returns The active theme to be used, or undefined if the
* default element theme shall be used. All wrapped in an observable
* that can also emit errors.
*/
abstract loadActiveTheme(): Observable<Theme | undefined>;
/**
* Sets the theme with the given name to active.
* @param name - The name of the theme to become active.
* @returns True on success, otherwise false.
*/
abstract activateTheme(name: string): Observable<boolean>;
/**
* Deactivate any active theme and makes the element theme the default one.
* @returns True on success, otherwise false.
*/
abstract deactivateTheme(): Observable<boolean>;
/**
* Load and return the available theme names.
* @returns An `Observable` of available theme names, other than the
* default element theme.
*/
abstract loadThemeNames(): Observable<string[]>;
/**
* Load theme with the given `name`.
* @param name - The name of the theme to be returned.
* @returns Observable with the named theme or `undefined` if no such theme exist.
*/
abstract loadTheme(name: string): Observable<Theme | undefined>;
/**
* Saves a theme to the store. The name shall not be empty. A theme with
* identical name gets overwritten.
* @param theme - The theme to be saved.
* @returns True on success, otherwise false. All nicely wrapped in
* an observable that may also emit errors.
*/
abstract saveTheme(theme: Theme): Observable<boolean>;
/**
* Deletes the theme with the given name from the store.
* @param name - The name of the theme to be deleted.
* @returns True on success, otherwise false. All nicely wrapped in
* an observable that may also emit errors. Returns false,
* if the theme does not exist.
*/
abstract deleteTheme(name: string): Observable<boolean>;
}
export const SI_THEME_LOCAL_STORAGE_KEY = 'si-themes';
export interface ThemeStorage {
activeTheme: string | undefined;
themes: { [key: string]: Theme };
}
export class SiDefaultThemeStore extends SiThemeStore {
private isBrowser: boolean;
constructor(isBrowser: boolean) {
super();
this.isBrowser = isBrowser;
}
loadActiveTheme(): Observable<Theme | undefined> {
if (!this.isBrowser) {
return of(undefined);
}
const store = this.loadStore();
if (store.activeTheme) {
return of(store.themes[store.activeTheme]);
} else {
return of(undefined);
}
}
activateTheme(name: string): Observable<boolean> {
if (!this.isBrowser) {
return of(false);
}
const store = this.loadStore();
if (store.themes[name]) {
store.activeTheme = name;
this.saveStore(store);
return of(true);
} else {
return of(false);
}
}
deactivateTheme(): Observable<boolean> {
if (!this.isBrowser) {
return of(false);
}
const store = this.loadStore();
store.activeTheme = undefined;
this.saveStore(store);
return of(true);
}
loadThemeNames(): Observable<string[]> {
if (!this.isBrowser) {
return of([]);
}
const store = this.loadStore();
return of(Array.from(Object.keys(store.themes)));
}
saveTheme(theme: Theme): Observable<boolean> {
if (!this.isBrowser) {
return of(false);
}
const store = this.loadStore();
store.themes[theme.name] = theme;
this.saveStore(store);
return of(true);
}
loadTheme(name: string): Observable<Theme | undefined> {
if (!this.isBrowser) {
return of(undefined);
}
const store = this.loadStore();
return of(store.themes[name]);
}
deleteTheme(name: string): Observable<boolean> {
if (!this.isBrowser) {
return of(false);
}
const store = this.loadStore();
delete store.themes[name];
if (store.activeTheme === name) {
store.activeTheme = undefined;
}
this.saveStore(store);
return of(true);
}
private loadStore(): ThemeStorage {
const storeStr = localStorage.getItem(SI_THEME_LOCAL_STORAGE_KEY);
if (storeStr) {
return JSON.parse(storeStr) as ThemeStorage;
} else {
return { activeTheme: undefined, themes: {} };
}
}
private saveStore(store: ThemeStorage): void {
localStorage.setItem(SI_THEME_LOCAL_STORAGE_KEY, JSON.stringify(store));
}
}
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