MOBILE-4616 keyboard: Fix dom-app circular dep by separating keyboard

src/addons/messages/pages/contacts-35/contacts.ts

@@ -22,13 +22,13 @@ import {
     AddonMessages,
 } from '../../services/messages';
 import { CoreDomUtils } from '@services/utils/dom';
-import { CoreApp } from '@services/app';
 import { CoreEventObserver, CoreEvents } from '@singletons/events';
 import { ActivatedRoute } from '@angular/router';
 import { Translate } from '@singletons';
 import { CoreScreen } from '@services/screen';
 import { CoreNavigator } from '@services/navigator';
 import { CoreSplitViewComponent } from '@components/split-view/split-view';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays the list of contacts.
@@ -205,15 +205,17 @@ export class AddonMessagesContacts35Page implements OnInit, OnDestroy {
      * @param query Text to search for.
      * @returns Resolved when done.
      */
-    search(query: string): Promise<void> {
+    async search(query: string): Promise<void> {
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         this.loaded = false;
         this.loadingMessage = this.searchingMessages;
 
-        return this.performSearch(query).finally(() => {
+        try {
+            await this.performSearch(query);
+        } finally {
             this.loaded = true;
-        });
+        }
     }
 
     /**

src/addons/messages/pages/discussion/discussion.ts

@@ -34,7 +34,6 @@ import { CoreDomUtils } from '@services/utils/dom';
 import { CoreUtils } from '@services/utils/utils';
 import { CoreTextUtils } from '@services/utils/text';
 import { CoreLogger } from '@singletons/logger';
-import { CoreApp } from '@services/app';
 import { CoreInfiniteLoadingComponent } from '@components/infinite-loading/infinite-loading';
 import { Md5 } from 'ts-md5/dist/md5';
 import moment from 'moment-timezone';
@@ -45,6 +44,7 @@ import { CoreIonLoadingElement } from '@classes/ion-loading';
 import { ActivatedRoute } from '@angular/router';
 import { CoreConstants } from '@/core/constants';
 import { CoreDom } from '@singletons/dom';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays a message discussion page.
@@ -1177,7 +1177,7 @@ export class AddonMessagesDiscussionPage implements OnInit, OnDestroy, AfterView
 
                 // Only close the keyboard if an error happens.
                 // We want the user to be able to send multiple messages without the keyboard being closed.
-                CoreApp.closeKeyboard();
+                CoreKeyboard.close();
 
                 CoreDomUtils.showErrorModalDefault(error, 'addon.messages.messagenotsent', true);
                 this.removeMessage(message.hash!);

src/addons/messages/pages/discussions-35/discussions.ts

@@ -23,7 +23,6 @@ import {
 } from '../../services/messages';
 import { CoreDomUtils } from '@services/utils/dom';
 import { CoreUtils } from '@services/utils/utils';
-import { CoreApp } from '@services/app';
 import { ActivatedRoute, Params } from '@angular/router';
 import { CorePushNotificationsNotificationBasicData } from '@features/pushnotifications/services/pushnotifications';
 import { CorePushNotificationsDelegate } from '@features/pushnotifications/services/push-delegate';
@@ -34,6 +33,7 @@ import { CoreScreen } from '@services/screen';
 import { CoreMainMenuDeepLinkManager } from '@features/mainmenu/classes/deep-link-manager';
 import { CorePlatform } from '@services/platform';
 import { CoreSplitViewComponent } from '@components/split-view/split-view';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays the list of discussions.
@@ -234,7 +234,7 @@ export class AddonMessagesDiscussions35Page implements OnInit, OnDestroy {
      * @returns Resolved when done.
      */
     async searchMessage(query: string): Promise<void> {
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
         this.loaded = false;
         this.loadingMessage = this.search.loading;
 

src/addons/messages/pages/search/search.ts

@@ -22,10 +22,10 @@ import {
     AddonMessages,
 } from '../../services/messages';
 import { CoreDomUtils } from '@services/utils/dom';
-import { CoreApp } from '@services/app';
 import { CoreNavigator } from '@services/navigator';
 import { CoreScreen } from '@services/screen';
 import { CoreSplitViewComponent } from '@components/split-view/split-view';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page for searching users.
@@ -124,7 +124,7 @@ export class AddonMessagesSearchPage implements OnDestroy {
      * @returns Resolved when done.
      */
     async search(query: string, loadMore?: 'contacts' | 'noncontacts' | 'messages', infiniteComplete?: () => void): Promise<void> {
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         this.query = query;
         this.disableSearch = true;

src/addons/mod/chat/pages/chat/chat.ts

@@ -16,7 +16,6 @@ import { Component, ViewChild, OnInit, OnDestroy } from '@angular/core';
 import { CoreSendMessageFormComponent } from '@components/send-message-form/send-message-form';
 import { CanLeave } from '@guards/can-leave';
 import { IonContent } from '@ionic/angular';
-import { CoreApp } from '@services/app';
 import { CoreNetwork } from '@services/network';
 import { CoreNavigator } from '@services/navigator';
 import { CoreSites } from '@services/sites';
@@ -30,6 +29,7 @@ import { AddonModChat, AddonModChatUser } from '../../services/chat';
 import { AddonModChatFormattedMessage, AddonModChatHelper } from '../../services/chat-helper';
 import { CoreTime } from '@singletons/time';
 import { CoreAnalytics, CoreAnalyticsEventType } from '@services/analytics';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays a chat session.
@@ -323,7 +323,7 @@ export class AddonModChatChatPage implements OnInit, OnDestroy, CanLeave {
         } catch (error) {
             // Only close the keyboard if an error happens, we want the user to be able to send multiple
             // messages without the keyboard being closed.
-            CoreApp.closeKeyboard();
+            CoreKeyboard.close();
 
             this.newMessage = text;
             CoreDomUtils.showErrorModalDefault(error, 'addon.mod_chat.errorwhilesendingmessage', true);

src/addons/notes/components/add/add-modal.ts

@@ -14,11 +14,11 @@
 
 import { AddonNotes, AddonNotesPublishState } from '@addons/notes/services/notes';
 import { Component, ViewChild, ElementRef, Input } from '@angular/core';
-import { CoreApp } from '@services/app';
 import { CoreSites } from '@services/sites';
 import { CoreDomUtils, ToastDuration } from '@services/utils/dom';
 import { CoreForms } from '@singletons/form';
 import { ModalController } from '@singletons';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Component that displays a text area for composing a note.
@@ -45,7 +45,7 @@ export class AddonNotesAddComponent {
         e.preventDefault();
         e.stopPropagation();
 
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
         const loadingModal = await CoreDomUtils.showModalLoading('core.sending', true);
 
         // Freeze the add note button.

src/core/features/comments/pages/viewer/viewer.ts

@@ -38,11 +38,11 @@ import { CoreError } from '@classes/errors/error';
 import { CoreCommentsOffline } from '@features/comments/services/comments-offline';
 import { CoreCommentsDBRecord } from '@features/comments/services/database/comments';
 import { CoreTimeUtils } from '@services/utils/time';
-import { CoreApp } from '@services/app';
 import { CoreNetwork } from '@services/network';
 import moment from 'moment-timezone';
 import { Subscription } from 'rxjs';
 import { CoreAnimations } from '@components/animations';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays comments.
@@ -309,7 +309,7 @@ export class CoreCommentsViewerPage implements OnInit, OnDestroy {
      * @param text Comment text to add.
      */
     async addComment(text: string): Promise<void> {
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
         const loadingModal = await CoreDomUtils.showModalLoading('core.sending', true);
         // Freeze the add comment button.
         this.sending = true;

src/core/features/login/pages/credentials/credentials.ts

@@ -36,6 +36,7 @@ import { CoreSitesFactory } from '@services/sites-factory';
 import { EMAIL_SIGNUP_FEATURE_NAME, FORGOTTEN_PASSWORD_FEATURE_NAME } from '@features/login/constants';
 import { CoreCustomURLSchemes } from '@services/urlschemes';
 import { CoreSiteError } from '@classes/errors/siteerror';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page to enter the user credentials.
@@ -253,7 +254,7 @@ export class CoreLoginCredentialsPage implements OnInit, OnDestroy {
         e?.preventDefault();
         e?.stopPropagation();
 
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         // Get input data.
         const siteUrl = this.site.getURL();

src/core/features/login/pages/reconnect/reconnect.ts

@@ -15,7 +15,6 @@
 import { Component, OnInit, OnDestroy, ViewChild, ElementRef } from '@angular/core';
 import { FormBuilder, FormGroup, Validators } from '@angular/forms';
 
-import { CoreApp } from '@services/app';
 import { CoreNetwork } from '@services/network';
 import { CoreSiteBasicInfo, CoreSites, CoreSitesReadingStrategy } from '@services/sites';
 import { CoreDomUtils } from '@services/utils/dom';
@@ -33,6 +32,7 @@ import { Translate } from '@singletons';
 import { SafeHtml } from '@angular/platform-browser';
 import { CoreSitePublicConfigResponse } from '@classes/sites/unauthenticated-site';
 import { FORGOTTEN_PASSWORD_FEATURE_NAME } from '@features/login/constants';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page to enter the user password to reconnect to a site.
@@ -217,7 +217,7 @@ export class CoreLoginReconnectPage implements OnInit, OnDestroy {
         e.preventDefault();
         e.stopPropagation();
 
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         // Get input data.
         const password = this.credForm.value.password;

src/core/features/login/pages/site/site.ts

@@ -15,7 +15,6 @@
 import { Component, OnInit, ViewChild, ElementRef } from '@angular/core';
 import { FormBuilder, FormGroup, ValidatorFn, AbstractControl, ValidationErrors } from '@angular/forms';
 
-import { CoreApp } from '@services/app';
 import { CoreNetwork } from '@services/network';
 import { CoreConfig } from '@services/config';
 import { CoreSites, CoreSiteCheckResponse, CoreLoginSiteInfo, CoreSitesDemoSiteData } from '@services/sites';
@@ -49,6 +48,7 @@ import { CoreReferrer } from '@services/referrer';
 import { CoreSitesFactory } from '@services/sites-factory';
 import { ONBOARDING_DONE } from '@features/login/constants';
 import { CoreUnauthenticatedSite } from '@classes/sites/unauthenticated-site';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Site (url) chooser when adding a new site.
@@ -285,7 +285,7 @@ export class CoreLoginSitePage implements OnInit {
         e?.preventDefault();
         e?.stopPropagation();
 
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         if (!url) {
             CoreDomUtils.showErrorModal('core.login.siteurlrequired', true);

src/core/features/tag/pages/search/search.ts

@@ -14,7 +14,6 @@
 
 import { Component, OnInit } from '@angular/core';
 
-import { CoreApp } from '@services/app';
 import { CoreDomUtils } from '@services/utils/dom';
 import { CoreUtils } from '@services/utils/utils';
 import { CoreTextUtils } from '@services/utils/text';
@@ -25,6 +24,7 @@ import { CoreNavigator } from '@services/navigator';
 import { CoreMainMenuDeepLinkManager } from '@features/mainmenu/classes/deep-link-manager';
 import { CoreTime } from '@singletons/time';
 import { CoreAnalytics, CoreAnalyticsEventType } from '@services/analytics';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays most used tags and allows searching.
@@ -153,7 +153,7 @@ export class CoreTagSearchPage implements OnInit {
         }
 
         this.logSearch = CoreTime.once(() => this.performLogSearch());
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         return this.fetchTags().catch((error) => {
             CoreDomUtils.showErrorModalDefault(error, 'Error loading tags.');

src/core/features/user/pages/participants/participants.page.ts

@@ -14,7 +14,6 @@
 
 import { AfterViewInit, Component, OnDestroy, OnInit, ViewChild } from '@angular/core';
 
-import { CoreApp } from '@services/app';
 import { CoreDomUtils } from '@services/utils/dom';
 import { CoreNavigator } from '@services/navigator';
 import { CoreListItemsManager } from '@classes/items-management/list-items-manager';
@@ -25,6 +24,7 @@ import { CoreUserParticipantsSource } from '@features/user/classes/participants-
 import { CoreRoutedItemsManagerSourcesTracker } from '@classes/items-management/routed-items-manager-sources-tracker';
 import { CoreAnalytics, CoreAnalyticsEventType } from '@services/analytics';
 import { Translate } from '@singletons';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Page that displays the list of course participants.
@@ -114,7 +114,7 @@ export class CoreUserParticipantsPage implements OnInit, AfterViewInit, OnDestro
      * @param query Text to search for.
      */
     async search(query: string): Promise<void> {
-        CoreApp.closeKeyboard();
+        CoreKeyboard.close();
 
         const newSource = CoreRoutedItemsManagerSourcesTracker.getOrCreateSource(
             CoreUserParticipantsSource,

src/core/initializers/subscribe-to-keyboard-events.ts

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import { CoreApp } from '@services/app';
+import { CoreKeyboard } from '@singletons/keyboard';
 import { NgZone, Keyboard } from '@singletons';
 
 /**
@@ -20,12 +20,11 @@ import { NgZone, Keyboard } from '@singletons';
  */
 export default function(): void {
     const zone = NgZone.instance;
-    const app = CoreApp.instance;
     const keyboard = Keyboard.instance;
 
     // Execute callbacks in the Angular zone, so change detection doesn't stop working.
-    keyboard.onKeyboardShow().subscribe(data => zone.run(() => app.onKeyboardShow(data.keyboardHeight)));
+    keyboard.onKeyboardShow().subscribe(data => zone.run(() => CoreKeyboard.onKeyboardShow(data.keyboardHeight)));
-    keyboard.onKeyboardHide().subscribe(() => zone.run(() => app.onKeyboardHide()));
+    keyboard.onKeyboardHide().subscribe(() => zone.run(() => CoreKeyboard.onKeyboardHide()));
-    keyboard.onKeyboardWillShow().subscribe(() => zone.run(() => app.onKeyboardWillShow()));
+    keyboard.onKeyboardWillShow().subscribe(() => zone.run(() => CoreKeyboard.onKeyboardWillShow()));
-    keyboard.onKeyboardWillHide().subscribe(() => zone.run(() => app.onKeyboardWillHide()));
+    keyboard.onKeyboardWillHide().subscribe(() => zone.run(() => CoreKeyboard.onKeyboardWillHide()));
 }

src/core/services/app.ts

@@ -18,7 +18,7 @@ import { CoreDB } from '@services/db';
 import { CoreEventObserver, CoreEvents } from '@singletons/events';
 import { SQLiteDB, SQLiteDBTableSchema } from '@classes/sqlitedb';
 
-import { makeSingleton, Keyboard, StatusBar } from '@singletons';
+import { makeSingleton, StatusBar } from '@singletons';
 import { CoreLogger } from '@singletons/logger';
 import { CoreColors } from '@singletons/colors';
 import { DBNAME, SCHEMA_VERSIONS_TABLE_NAME, SCHEMA_VERSIONS_TABLE_SCHEMA, SchemaVersionsDBEntry } from '@services/database/app';
@@ -32,6 +32,7 @@ import { Subscription } from 'rxjs';
 import { CorePlatform } from '@services/platform';
 import { CoreNetwork, CoreNetworkConnection } from '@services/network';
 import { CoreMainMenuProvider } from '@features/mainmenu/services/mainmenu';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /**
  * Factory to provide some global functionalities, like access to the global app database.
@@ -52,9 +53,6 @@ export class CoreAppProvider {
     protected db?: SQLiteDB;
     protected logger: CoreLogger;
     protected ssoAuthenticationDeferred?: CorePromisedValue<void>;
-    protected isKeyboardShown = false;
-    protected keyboardOpening = false;
-    protected keyboardClosing = false;
     protected redirect?: CoreRedirectData;
     protected schemaVersionsTable = asyncInstance<CoreDatabaseTable<SchemaVersionsDBEntry, 'name'>>();
     protected mainMenuListener?: CoreEventObserver;
@@ -129,11 +127,11 @@ export class CoreAppProvider {
 
     /**
      * Closes the keyboard.
+     *
+     * @deprecated sinde 4.5.0. Use CoreKeyboard.closeKeyboard instead.
      */
     closeKeyboard(): void {
-        if (CorePlatform.isMobile()) {
+        CoreKeyboard.close();
-            Keyboard.hide();
-        }
     }
 
     /**
@@ -246,27 +244,30 @@ export class CoreAppProvider {
      * Check if the keyboard is closing.
      *
      * @returns Whether keyboard is closing (animating).
+     * @deprecated since 4.5.0. Use CoreKeyboard.isKeyboardClosing instead.
      */
     isKeyboardClosing(): boolean {
-        return this.keyboardClosing;
+        return CoreKeyboard.isKeyboardClosing();
     }
 
     /**
      * Check if the keyboard is being opened.
      *
      * @returns Whether keyboard is opening (animating).
+     * @deprecated since 4.5.0. Use CoreKeyboard.isKeyboardOpening instead.
      */
     isKeyboardOpening(): boolean {
-        return this.keyboardOpening;
+        return CoreKeyboard.isKeyboardOpening();
     }
 
     /**
      * Check if the keyboard is visible.
      *
      * @returns Whether keyboard is visible.
+     * @deprecated since 4.5.0. Use CoreKeyboard.isKeyboardVisible instead.
      */
     isKeyboardVisible(): boolean {
-        return this.isKeyboardShown;
+        return CoreKeyboard.isKeyboardVisible();
     }
 
     /**
@@ -320,61 +321,48 @@ export class CoreAppProvider {
 
     /**
      * Open the keyboard.
+     *
+     * @deprecated since 4.5.0. Use CoreKeyboard.openKeyboard instead.
      */
     openKeyboard(): void {
-        // Open keyboard is not supported in desktop and in iOS.
+        CoreKeyboard.open();
-        if (CorePlatform.isAndroid()) {
-            Keyboard.show();
-        }
     }
 
     /**
      * Notify that Keyboard has been shown.
      *
      * @param keyboardHeight Keyboard height.
+     * @deprecated since 4.5.0. Use CoreKeyboard.onKeyboardShow instead.
      */
     onKeyboardShow(keyboardHeight: number): void {
-        document.body.classList.add('keyboard-is-open');
+        CoreKeyboard.onKeyboardShow(keyboardHeight);
-        this.setKeyboardShown(true);
-        // Error on iOS calculating size.
-        // More info: https://github.com/ionic-team/ionic-plugin-keyboard/issues/276 .
-        CoreEvents.trigger(CoreEvents.KEYBOARD_CHANGE, keyboardHeight);
     }
 
     /**
      * Notify that Keyboard has been hidden.
+     *
+     * @deprecated since 4.5.0. Use CoreKeyboard.onKeyboardHide instead.
      */
     onKeyboardHide(): void {
-        document.body.classList.remove('keyboard-is-open');
+        CoreKeyboard.onKeyboardHide();
-        this.setKeyboardShown(false);
-        CoreEvents.trigger(CoreEvents.KEYBOARD_CHANGE, 0);
     }
 
     /**
      * Notify that Keyboard is about to be shown.
+     *
+     * @deprecated since 4.5.0. Use CoreKeyboard.onKeyboardWillShow instead.
      */
     onKeyboardWillShow(): void {
-        this.keyboardOpening = true;
+        CoreKeyboard.onKeyboardWillShow();
-        this.keyboardClosing = false;
     }
 
     /**
      * Notify that Keyboard is about to be hidden.
+     *
+     * @deprecated since 4.5.0. Use CoreKeyboard.onKeyboardWillHide instead.
      */
     onKeyboardWillHide(): void {
-        this.keyboardOpening = false;
+        CoreKeyboard.onKeyboardWillHide();
-        this.keyboardClosing = true;
-    }
-
-    /**
-     * Set keyboard shown or hidden.
-     *
-     * @param shown Whether the keyboard is shown or hidden.
-     */
-    protected setKeyboardShown(shown: boolean): void {
-        this.isKeyboardShown = shown;
-        this.keyboardOpening = false;
-        this.keyboardClosing = false;
     }
 
     /**

src/core/services/config.ts

@@ -75,7 +75,7 @@ export class CoreConfigProvider {
     async initializeDatabase(): Promise<void> {
         try {
             await CoreApp.createTablesFromSchema(APP_SCHEMA);
-        } catch (e) {
+        } catch {
             // Ignore errors.
         }
 

src/core/services/utils/dom.ts

@@ -17,7 +17,6 @@ import { IonContent } from '@ionic/angular';
 import { ModalOptions, PopoverOptions, AlertOptions, AlertButton, TextFieldTypes, ToastOptions } from '@ionic/core';
 import { Md5 } from 'ts-md5';
 
-import { CoreApp } from '@services/app';
 import { CoreConfig } from '@services/config';
 import { CoreFile } from '@services/file';
 import { CoreWSExternalWarning } from '@services/ws';
@@ -60,6 +59,7 @@ import { CoreLang } from '@services/lang';
 import { CorePasswordModalParams, CorePasswordModalResponse } from '@components/password-modal/password-modal';
 import { CoreWSError } from '@classes/errors/wserror';
 import { CoreErrorLogs } from '@singletons/error-logs';
+import { CoreKeyboard } from '@singletons/keyboard';
 
 /*
  * "Utils" service with helper functions for UI, DOM elements and HTML code.
@@ -337,7 +337,7 @@ export class CoreDomUtilsProvider {
                 await CoreUtils.nextTick();
                 if (CorePlatform.isAndroid() && this.supportsInputKeyboard(elementToFocus)) {
                     // On some Android versions the keyboard doesn't open automatically.
-                    CoreApp.openKeyboard();
+                    CoreKeyboard.open();
                 }
                 break;
             }

src/core/singletons/keyboard.ts

@@ -0,0 +1,123 @@
+// (C) Copyright 2015 Moodle Pty 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 { CorePlatform } from '@services/platform';
+import { Keyboard } from '@singletons';
+import { CoreEvents } from '@singletons/events';
+
+/**
+ * Singleton with helper functions for keybard management.
+ */
+export class CoreKeyboard {
+
+    protected static isKeyboardShown = false;
+    protected static keyboardOpening = false;
+    protected static keyboardClosing = false;
+
+    /**
+     * Closes the keyboard.
+     */
+    static close(): void {
+        if (CorePlatform.isMobile()) {
+            Keyboard.hide();
+        }
+    }
+
+    /**
+     * Open the keyboard.
+     */
+    static open(): void {
+        // Open keyboard is not supported in desktop and in iOS.
+        if (CorePlatform.isAndroid()) {
+            Keyboard.show();
+        }
+    }
+
+    /**
+     * Notify that Keyboard has been shown.
+     *
+     * @param keyboardHeight Keyboard height.
+     */
+    static onKeyboardShow(keyboardHeight: number): void {
+        document.body.classList.add('keyboard-is-open');
+        this.setKeyboardShown(true);
+        // Error on iOS calculating size.
+        // More info: https://github.com/ionic-team/ionic-plugin-keyboard/issues/276 .
+        CoreEvents.trigger(CoreEvents.KEYBOARD_CHANGE, keyboardHeight);
+    }
+
+    /**
+     * Notify that Keyboard has been hidden.
+     */
+    static onKeyboardHide(): void {
+        document.body.classList.remove('keyboard-is-open');
+        this.setKeyboardShown(false);
+        CoreEvents.trigger(CoreEvents.KEYBOARD_CHANGE, 0);
+    }
+
+    /**
+     * Notify that Keyboard is about to be shown.
+     */
+    static onKeyboardWillShow(): void {
+        CoreKeyboard.keyboardOpening = true;
+        CoreKeyboard.keyboardClosing = false;
+    }
+
+    /**
+     * Notify that Keyboard is about to be hidden.
+     */
+    static onKeyboardWillHide(): void {
+        CoreKeyboard.keyboardOpening = false;
+        CoreKeyboard.keyboardClosing = true;
+    }
+
+    /**
+     * Set keyboard shown or hidden.
+     *
+     * @param shown Whether the keyboard is shown or hidden.
+     */
+    protected static setKeyboardShown(shown: boolean): void {
+        CoreKeyboard.isKeyboardShown = shown;
+        CoreKeyboard.keyboardOpening = false;
+        CoreKeyboard.keyboardClosing = false;
+    }
+
+    /**
+     * Check if the keyboard is closing.
+     *
+     * @returns Whether keyboard is closing (animating).
+     */
+    static isKeyboardClosing(): boolean {
+        return CoreKeyboard.keyboardClosing;
+    }
+
+    /**
+     * Check if the keyboard is being opened.
+     *
+     * @returns Whether keyboard is opening (animating).
+     */
+    static isKeyboardOpening(): boolean {
+        return CoreKeyboard.keyboardOpening;
+    }
+
+    /**
+     * Check if the keyboard is visible.
+     *
+     * @returns Whether keyboard is visible.
+     */
+    static isKeyboardVisible(): boolean {
+        return CoreKeyboard.isKeyboardShown;
+    }
+
+}