forked from EVOgeek/Vmeda.Online
102 lines
3.1 KiB
TypeScript
102 lines
3.1 KiB
TypeScript
// (C) Copyright 2015 Moodle Pty Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import { Injectable } from '@angular/core';
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import { CoreIonLoadingElement } from '@classes/ion-loading';
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import { Translate, makeSingleton } from '@singletons';
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import { CoreAlerts } from './alerts';
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/**
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* Handles application loading.
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*/
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@Injectable({ providedIn: 'root' })
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export class CoreLoadingsService {
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protected activeLoadingModals: CoreIonLoadingElement[] = [];
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/**
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* Displays a loading modal window.
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*
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* @param text The text of the modal window. Default: core.loading.
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* @param needsTranslate Whether the 'text' needs to be translated.
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* @returns Loading element instance.
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* @description
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* Usage:
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* let modal = await CoreLoading.show(myText);
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* ...
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* modal.dismiss();
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*/
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async show(text?: string, needsTranslate?: boolean): Promise<CoreIonLoadingElement> {
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if (!text) {
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text = Translate.instant('core.loading');
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} else if (needsTranslate) {
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text = Translate.instant(text);
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}
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const loading = new CoreIonLoadingElement(text);
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loading.onDismiss(() => {
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const index = this.activeLoadingModals.indexOf(loading);
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if (index !== -1) {
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this.activeLoadingModals.splice(index, 1);
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}
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});
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this.activeLoadingModals.push(loading);
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await loading.present();
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return loading;
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}
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/**
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* Show a loading modal whilst an operation is running, and an error modal if it fails.
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*
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* @param text Loading dialog text.
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* @param needsTranslate Whether the 'text' needs to be translated.
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* @param operation Operation.
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* @returns Operation result.
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*/
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async showOperationModals<T>(text: string, needsTranslate: boolean, operation: () => Promise<T>): Promise<T | null> {
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const modal = await this.show(text, needsTranslate);
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try {
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return await operation();
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} catch (error) {
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CoreAlerts.showError(error);
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return null;
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} finally {
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modal.dismiss();
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}
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}
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/**
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* Pauses the active loading modal.
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*/
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async pauseActiveModals(): Promise<void> {
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await Promise.all(this.activeLoadingModals.slice(0).reverse().map(modal => modal.pause()));
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}
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/**
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* Resumes the active loading modals.
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*/
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async resumeActiveModals(): Promise<void> {
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await Promise.all(this.activeLoadingModals.map(modal => modal.resume()));
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}
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}
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export const CoreLoadings = makeSingleton(CoreLoadingsService);
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