87 lines
3.3 KiB
TypeScript
87 lines
3.3 KiB
TypeScript
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// (C) Copyright 2015 Martin Dougiamas
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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 { Component, Input, Output, EventEmitter, OnInit, OnDestroy, ElementRef, ViewChild } from '@angular/core';
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import { CoreTimeUtilsProvider } from '@providers/utils/time';
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/**
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* This directive shows a timer in format HH:MM:SS. When the countdown reaches 0, a function is called.
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*
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* Usage:
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* <core-timer [endTime]="endTime" (finished)="timeUp()" [timerText]="'addon.mod_quiz.timeleft' | translate"></core-timer>
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*/
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@Component({
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selector: 'core-timer',
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templateUrl: 'timer.html'
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})
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export class CoreTimerComponent implements OnInit, OnDestroy {
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@Input() endTime: string | number; // Timestamp (in seconds) when the timer should end.
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@Input() timerText: string; // Text to show next to the timer. If not defined, no text shown.
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@Input() timeLeftClass: string; // Name of the class to apply with each second. By default, 'core-timer-timeleft-'.
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@Input() align: string; // Where to align the time and text. Defaults to 'left'. Other values: 'center', 'right'.
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@Output() finished: EventEmitter<void>; // Will emit an event when the timer reaches 0.
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@ViewChild('container', { read: ElementRef }) containerRef: ElementRef;
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timeLeft: number; // Seconds left to end.
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protected timeInterval;
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protected container: HTMLElement;
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constructor(protected timeUtils: CoreTimeUtilsProvider) {
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this.finished = new EventEmitter();
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}
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/**
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* Component being initialized.
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*/
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ngOnInit(): void {
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const timeLeftClass = this.timeLeftClass || 'core-timer-timeleft-',
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endTime = Math.round(Number(this.endTime)),
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container: HTMLElement = this.containerRef && this.containerRef.nativeElement;
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if (!endTime) {
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return;
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}
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// Check time left every 200ms.
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this.timeInterval = setInterval(() => {
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this.timeLeft = endTime - this.timeUtils.timestamp();
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if (this.timeLeft < 0) {
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// Time is up! Stop the timer and call the finish function.
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clearInterval(this.timeInterval);
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this.finished.emit();
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return;
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}
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// If the time has nearly expired, change the color.
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if (this.timeLeft < 100 && !container.classList.contains(timeLeftClass + this.timeLeft)) {
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// Time left has changed. Remove previous classes and add the new one.
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container.classList.remove(timeLeftClass + (this.timeLeft + 1));
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container.classList.remove(timeLeftClass + (this.timeLeft + 2));
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container.classList.add(timeLeftClass + this.timeLeft);
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}
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}, 200);
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}
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/**
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* Component destroyed.
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*/
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ngOnDestroy(): void {
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clearInterval(this.timeInterval);
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}
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}
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