64 lines
2.0 KiB
TypeScript
64 lines
2.0 KiB
TypeScript
// (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 { Directive, OnInit, OnDestroy } from '@angular/core';
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import { TranslateService } from '@ngx-translate/core';
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import { Navbar, Platform } from 'ionic-angular';
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import { CoreEventsProvider } from '@providers/events';
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/**
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* Directive to tramslate the back button of navigation bars in iOS.
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*
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* @description
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* Usage:
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* <ion-navbar core-back-button> ... </ion-navbar>
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*/
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@Directive({
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selector: 'ion-navbar[core-back-button]'
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})
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export class CoreBackButtonDirective implements OnInit, OnDestroy {
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protected languageObserver: any;
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constructor(private host: Navbar, private platform: Platform,
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private translate: TranslateService, private eventsProvider: CoreEventsProvider) {}
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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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this.setTranslatedBackButtonText();
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this.languageObserver = this.eventsProvider.on(CoreEventsProvider.LANGUAGE_CHANGED, () => {
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this.setTranslatedBackButtonText();
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});
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}
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/**
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* Component being destroyed.
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*/
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ngOnDestroy(): void {
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if (this.languageObserver) {
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this.languageObserver.off();
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}
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}
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/**
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* Set the trasnlated back button text in iOS.
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*/
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protected setTranslatedBackButtonText(): void {
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if (this.host && this.platform.is('ios')) {
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this.host.setBackButtonText(this.translate.instant('core.back'));
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}
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}
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}
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