MOBILE-3025 blocks: Merge blocks and content scroll

src/app/app.scss

@@ -226,6 +226,7 @@ ion-app.app-root {
     user-select: text;
     word-break: break-word;
     word-wrap: break-word;
+    white-space: normal;
 
     &[maxHeight],
     &[ng-reflect-max-height] {

src/components/rich-text-editor/rich-text-editor.ts

@@ -103,7 +103,7 @@ export class CoreRichTextEditorComponent implements AfterContentInit, OnDestroy
     }
 
     /**
-     * Init editor
+     * Init editor.
      */
     ngAfterContentInit(): void {
         this.domUtils.isRichTextEditorEnabled().then((enabled) => {

src/components/tabs/tab.ts

@@ -121,18 +121,14 @@ export class CoreTabComponent implements OnInit, OnDestroy {
         this.showHideNavBarButtons(true);
 
         // Setup tab scrolling.
-        setTimeout(() => {
+        this.domUtils.waitElementToExist(() => this.content ? this.content.getScrollElement() :
-            // Workaround to solve undefined this.scroll on tab change.
+                this.element.querySelector('ion-content > .scroll-content')).then((scroll) => {
-            const scroll: HTMLElement = this.content ? this.content.getScrollElement() :
+            scroll.addEventListener('scroll', (e): void => {
-                this.element.querySelector('ion-content > .scroll-content');
+                this.tabs.showHideTabs(e.target);
+            });
 
-            if (scroll) {
+            this.tabs.showHideTabs(scroll);
-                scroll.onscroll = (e): void => {
+        });
-                    this.tabs.showHideTabs(e.target);
-                };
-                this.tabs.showHideTabs(scroll);
-            }
-        }, 1);
     }
 
     /**

src/core/block/components/block/block.scss

@@ -1,5 +1,6 @@
 ion-app.app-root core-block {
   position: relative;
+  display: block;
 
   core-loading.core-loading-center {
     display: block;

src/core/block/components/course-blocks/core-block-course-blocks.html

@@ -2,13 +2,15 @@
     <ng-content></ng-content>
 </div>
 
-<ion-content *ngIf="blocks && blocks.length > 0" [class.core-hide-blocks]="hideBlocks" class="core-course-blocks-side">
+<div *ngIf="blocks && blocks.length > 0" [class.core-hide-blocks]="hideBlocks" class="core-course-blocks-side">
-    <core-loading [hideUntil]="dataLoaded" class="core-loading-center">
+    <div class="core-course-blocks-side-scroll">
-        <ion-list>
+        <core-loading [hideUntil]="dataLoaded" class="core-loading-center">
-            <!-- Course blocks. -->
+            <ion-list>
-            <ng-container *ngFor="let block of blocks">
+                <!-- Course blocks. -->
-                <core-block [block]="block" contextLevel="course" [instanceId]="courseId" [extraData]="{'downloadEnabled': downloadEnabled}"></core-block>
+                <ng-container *ngFor="let block of blocks">
-            </ng-container>
+                    <core-block [block]="block" contextLevel="course" [instanceId]="courseId" [extraData]="{'downloadEnabled': downloadEnabled}"></core-block>
-        </ion-list>
+                </ng-container>
-    </core-loading>
+            </ion-list>
-</ion-content>
+        </core-loading>
+    </div>
+</div>

src/core/block/components/course-blocks/course-blocks.scss

@@ -1,8 +1,5 @@
-$core-side-blocks-max-small-width: 300px;
+$core-side-blocks-max-width: 30%;
-$core-side-blocks-min-small-width: 25%;
+$core-side-blocks-min-width: 280px;
-
-$core-side-blocks-max-width: 320px;
-$core-side-blocks-min-width: 30%;
 
 .core-course-block-with-blocks > .scroll-content {
     overflow-y: visible;
@@ -10,15 +7,8 @@ $core-side-blocks-min-width: 30%;
 
 ion-app.app-root core-block-course-blocks {
 
-    &.core-no-blocks {
+    &.core-no-blocks .core-course-blocks-content {
-        .core-course-blocks-content > ion-content {
+        height: auto;
-            height: auto;
-
-            > .scroll-content {
-                overflow-y: visible;
-                position: relative;
-            }
-        }
     }
 
     &.core-has-blocks {
@@ -33,49 +23,51 @@ ion-app.app-root core-block-course-blocks {
             flex-wrap: nowrap;
 
             .core-course-blocks-content {
-                min-width: calc(100% - #{($core-side-blocks-max-small-width)});
-                max-width: calc(100% - #{($core-side-blocks-min-small-width)});
-                z-index: 0;
-                flex: 1;
                 box-shadow: none !important;
+                flex-grow: 1;
+                max-width: 100%;
             }
 
-            ion-content.core-course-blocks-side {
+            div.core-course-blocks-side {
-                transform: none !important;
+                position: relative;
-                position: sticky;
+                @include position(auto, 0, auto, auto);
-                @include position(0, 0, 0, auto);
-                z-index: 30;
-                max-width: $core-side-blocks-max-small-width;
-                min-width: $core-side-blocks-min-small-width;
-                @include border-start(1px, solid, $list-md-border-color);
-            }
-        }
-
-        @include media-breakpoint-up(lg) {
-            .core-course-blocks-content {
-                min-width: calc(100% - #{($core-side-blocks-max-width)});
-                max-width: calc(100% - #{($core-side-blocks-min-width)});
-            }
-
-            ion-content.core-course-blocks-side {
                 max-width: $core-side-blocks-max-width;
                 min-width: $core-side-blocks-min-width;
+                @include border-start(1px, solid, $list-md-border-color);
+
+                .core-course-blocks-side-scroll {
+                    position: absolute;
+                    top: 0;
+                    max-width: 100%;
+                    min-width: 100%;
+
+                    &.core-course-blocks-fixed-bottom {
+                        position: fixed;
+                        bottom: 0;
+                        top: auto;
+                        transform: none !important;
+                    }
+
+                    core-block {
+                        max-width: $core-side-blocks-max-width;
+                        min-width: $core-side-blocks-min-width;
+                    }
+                }
             }
         }
 
         @include media-breakpoint-down(sm) {
             // Disable scroll on individual columns.
-            .core-course-blocks-content > ion-content,
+            div.core-course-blocks-side {
-            ion-content.core-course-blocks-side {
+                transform: none !important;
                 height: auto;
 
                 &.core-hide-blocks {
                     display: none;
                 }
 
-                > .scroll-content {
+                .core-course-blocks-side-scroll {
-                    overflow-y: visible;
+                    transform: none !important;
-                    position: relative;
                 }
             }
         }

src/core/block/components/course-blocks/course-blocks.ts

@@ -12,9 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import { Component, ViewChildren, Input, OnInit, QueryList, ElementRef, Optional } from '@angular/core';
+import { Component, ViewChildren, Input, OnInit, QueryList, ElementRef, OnDestroy } from '@angular/core';
 import { Content } from 'ionic-angular';
 import { CoreDomUtilsProvider } from '@providers/utils/dom';
+import { CoreAppProvider } from '@providers/app';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreBlockComponent } from '../block/block';
 import { CoreBlockHelperProvider } from '../../providers/helper';
@@ -26,7 +27,7 @@ import { CoreBlockHelperProvider } from '../../providers/helper';
     selector: 'core-block-course-blocks',
     templateUrl: 'core-block-course-blocks.html',
 })
-export class CoreBlockCourseBlocksComponent implements OnInit {
+export class CoreBlockCourseBlocksComponent implements OnInit, OnDestroy {
 
     @Input() courseId: number;
     @Input() hideBlocks = false;
@@ -38,13 +39,17 @@ export class CoreBlockCourseBlocksComponent implements OnInit {
     blocks = [];
 
     protected element: HTMLElement;
-    protected parentContent: HTMLElement;
+    protected lastScroll;
+    protected translationY = 0;
+    protected blocksScrollHeight = 0;
+    protected sideScroll: HTMLElement;
+    protected vpHeight = 0; // Viewport height.
+    protected scrollWorking = false;
 
     constructor(private domUtils: CoreDomUtilsProvider, private courseProvider: CoreCourseProvider,
             protected blockHelper: CoreBlockHelperProvider, element: ElementRef,
-            @Optional() content: Content) {
+            protected content: Content, protected appProvider: CoreAppProvider) {
         this.element = element.nativeElement;
-        this.parentContent = content.getElementRef().nativeElement;
     }
 
     /**
@@ -53,9 +58,77 @@ export class CoreBlockCourseBlocksComponent implements OnInit {
     ngOnInit(): void {
         this.loadContent().finally(() => {
             this.dataLoaded = true;
+
+            window.addEventListener('resize', this.initScroll.bind(this));
         });
     }
 
+    /**
+     * Setup scrolling.
+     */
+    protected initScroll(): void {
+        const scroll: HTMLElement = this.content && this.content.getScrollElement();
+
+        this.domUtils.waitElementToExist(() => scroll && scroll.querySelector('.core-course-blocks-side')).then((sideElement) => {
+            const contentHeight = parseInt(this.content.getNativeElement().querySelector('.scroll-content').scrollHeight, 10);
+
+            this.sideScroll = scroll.querySelector('.core-course-blocks-side-scroll');
+            this.blocksScrollHeight = this.sideScroll.scrollHeight;
+            this.vpHeight = sideElement.clientHeight;
+
+            // Check if needed and event was not init before.
+            if (this.appProvider.isWide() && this.vpHeight && contentHeight > this.vpHeight &&
+                    this.blocksScrollHeight > this.vpHeight) {
+                if (typeof this.lastScroll == 'undefined') {
+                    this.lastScroll = 0;
+                    scroll.addEventListener('scroll', this.scrollFunction.bind(this));
+                }
+                this.scrollWorking = true;
+            } else {
+                this.sideScroll.style.transform = 'translate(0, 0)';
+                this.sideScroll.classList.remove('core-course-blocks-fixed-bottom');
+                this.scrollWorking = false;
+            }
+        });
+    }
+
+    /**
+     * Scroll function that moves the sidebar if needed.
+     *
+     * @param {Event} e Event to get the target from.
+     */
+    protected scrollFunction(e: Event): void {
+        if (!this.scrollWorking) {
+            return;
+        }
+
+        const target: any = e.target,
+            top = parseInt(target.scrollTop, 10),
+            goingUp = top < this.lastScroll;
+        if (goingUp) {
+            this.sideScroll.classList.remove('core-course-blocks-fixed-bottom');
+            if (top <= this.translationY ) {
+                // Fixed to top.
+                this.translationY = top;
+                this.sideScroll.style.transform = 'translate(0, ' + this.translationY + 'px)';
+            }
+        } else if (top - this.translationY >= (this.blocksScrollHeight - this.vpHeight)) {
+            // Fixed to bottom.
+            this.sideScroll.classList.add('core-course-blocks-fixed-bottom');
+            this.translationY = top - (this.blocksScrollHeight - this.vpHeight);
+            this.sideScroll.style.transform = 'translate(0, ' + this.translationY + 'px)';
+        }
+
+        this.lastScroll = top;
+    }
+
+    /**
+     * Component destroyed.
+     */
+    ngOnDestroy(): void {
+        window.removeEventListener('resize', this.initScroll);
+    }
+
     /**
      * Invalidate blocks data.
      *
@@ -95,11 +168,13 @@ export class CoreBlockCourseBlocksComponent implements OnInit {
                 this.element.classList.add('core-has-blocks');
                 this.element.classList.remove('core-no-blocks');
 
-                this.parentContent.classList.add('core-course-block-with-blocks');
+                this.content.getElementRef().nativeElement.classList.add('core-course-block-with-blocks');
+
+                this.initScroll();
             } else {
                 this.element.classList.remove('core-has-blocks');
                 this.element.classList.add('core-no-blocks');
-                this.parentContent.classList.remove('core-course-block-with-blocks');
+                this.content.getElementRef().nativeElement.classList.remove('core-course-block-with-blocks');
             }
         });
     }

src/core/course/components/format/core-course-format.html

@@ -6,69 +6,67 @@
 </core-navbar-buttons>
 
 <core-block-course-blocks [courseId]="course.id" [hideBlocks]="selectedSection && selectedSection.id == allSectionsId && canLoadMore" [downloadEnabled]="downloadEnabled">
-    <ion-content>
+    <!-- Default course format. -->
-        <!-- Default course format. -->
+    <core-dynamic-component [component]="courseFormatComponent" [data]="data">
-        <core-dynamic-component [component]="courseFormatComponent" [data]="data">
+        <core-loading [hideUntil]="loaded">
-            <core-loading [hideUntil]="loaded">
+            <!-- Section selector. -->
-                <!-- Section selector. -->
+            <core-dynamic-component [component]="sectionSelectorComponent" [data]="data">
-                <core-dynamic-component [component]="sectionSelectorComponent" [data]="data">
+                <div text-wrap *ngIf="displaySectionSelector && sections && sections.length" padding class="clearfix" ion-row justify-content-between class="safe-padding-horizontal" [class.core-section-download]="downloadEnabled">
-                    <div text-wrap *ngIf="displaySectionSelector && sections && sections.length" padding class="clearfix" ion-row justify-content-between class="safe-padding-horizontal" [class.core-section-download]="downloadEnabled">
+                    <button float-start ion-button icon-start icon-end (click)="showSectionSelector($event)" color="light" class="core-button-select button-no-uppercase" ion-col [attr.aria-label]="('core.course.sections' | translate) + ': ' + (selectedSection && (selectedSection.formattedName || selectedSection.name))" aria-haspopup="true" [attr.aria-expanded]="sectionSelectorExpanded" aria-controls="core-course-section-selector" id="core-course-section-button">
-                        <button float-start ion-button icon-start icon-end (click)="showSectionSelector($event)" color="light" class="core-button-select button-no-uppercase" ion-col [attr.aria-label]="('core.course.sections' | translate) + ': ' + (selectedSection && (selectedSection.formattedName || selectedSection.name))" aria-haspopup="true" [attr.aria-expanded]="sectionSelectorExpanded" aria-controls="core-course-section-selector" id="core-course-section-button">
+                        <core-icon name="fa-folder"></core-icon>
-                            <core-icon name="fa-folder"></core-icon>
+                        <span class="core-section-selector-text">{{selectedSection && (selectedSection.formattedName || selectedSection.name) || 'core.course.sections' | translate }}</span>
-                            <span class="core-section-selector-text">{{selectedSection && (selectedSection.formattedName || selectedSection.name) || 'core.course.sections' | translate }}</span>
+                        <ion-icon name="arrow-dropdown" ios="md-arrow-dropdown"></ion-icon>
-                            <ion-icon name="arrow-dropdown" ios="md-arrow-dropdown"></ion-icon>
+                    </button>
-                        </button>
+                    <!-- Section download. -->
-                        <!-- Section download. -->
+                    <ng-container *ngTemplateOutlet="sectionDownloadTemplate; context: {section: selectedSection}"></ng-container>
-                        <ng-container *ngTemplateOutlet="sectionDownloadTemplate; context: {section: selectedSection}"></ng-container>
+                </div>
+            </core-dynamic-component>
+
+            <!-- Course summary. By default we only display the course progress. -->
+            <core-dynamic-component [component]="courseSummaryComponent" [data]="data">
+                <ion-list no-lines *ngIf="course.imageThumb || (selectedSection && selectedSection.id == allSectionsId && course.progress != null && course.progress >= 0)" class="core-format-progress-list">
+                    <div *ngIf="course.imageThumb" class="core-course-thumb">
+                        <img [src]="course.imageThumb" core-external-content alt=""/>
                     </div>
+                    <ion-item class="core-course-progress" *ngIf="selectedSection && selectedSection.id == allSectionsId && course.progress != null && course.progress >= 0 && course.completionusertracked !== false">
+                        <core-progress-bar [progress]="course.progress"></core-progress-bar>
+                    </ion-item>
+                </ion-list>
+            </core-dynamic-component>
+
+            <!-- Single section. -->
+            <div *ngIf="selectedSection && selectedSection.id != allSectionsId">
+                <core-dynamic-component [component]="singleSectionComponent" [data]="data">
+                    <ng-container *ngTemplateOutlet="sectionTemplate; context: {section: selectedSection}"></ng-container>
+                    <core-empty-box *ngIf="!selectedSection.hasContent" icon="qr-scanner" [message]="'core.course.nocontentavailable' | translate"></core-empty-box>
                 </core-dynamic-component>
+            </div>
 
-                <!-- Course summary. By default we only display the course progress. -->
+            <!-- Multiple sections. -->
-                <core-dynamic-component [component]="courseSummaryComponent" [data]="data">
+            <div *ngIf="selectedSection && selectedSection.id == allSectionsId">
-                    <ion-list no-lines *ngIf="course.imageThumb || (selectedSection && selectedSection.id == allSectionsId && course.progress != null && course.progress >= 0)" class="core-format-progress-list">
+                <core-dynamic-component [component]="allSectionsComponent" [data]="data">
-                        <div *ngIf="course.imageThumb" class="core-course-thumb">
+                    <ng-container *ngFor="let section of sections; index as i">
-                            <img [src]="course.imageThumb" core-external-content alt=""/>
+                        <ng-container *ngIf="i <= showSectionId">
-                        </div>
+                            <ng-container *ngTemplateOutlet="sectionTemplate; context: {section: section}"></ng-container>
-                        <ion-item class="core-course-progress" *ngIf="selectedSection && selectedSection.id == allSectionsId && course.progress != null && course.progress >= 0 && course.completionusertracked !== false">
-                            <core-progress-bar [progress]="course.progress"></core-progress-bar>
-                        </ion-item>
-                    </ion-list>
-                </core-dynamic-component>
-
-                <!-- Single section. -->
-                <div *ngIf="selectedSection && selectedSection.id != allSectionsId">
-                    <core-dynamic-component [component]="singleSectionComponent" [data]="data">
-                        <ng-container *ngTemplateOutlet="sectionTemplate; context: {section: selectedSection}"></ng-container>
-                        <core-empty-box *ngIf="!selectedSection.hasContent" icon="qr-scanner" [message]="'core.course.nocontentavailable' | translate"></core-empty-box>
-                    </core-dynamic-component>
-                </div>
-
-                <!-- Multiple sections. -->
-                <div *ngIf="selectedSection && selectedSection.id == allSectionsId">
-                    <core-dynamic-component [component]="allSectionsComponent" [data]="data">
-                        <ng-container *ngFor="let section of sections; index as i">
-                            <ng-container *ngIf="i <= showSectionId">
-                                <ng-container *ngTemplateOutlet="sectionTemplate; context: {section: section}"></ng-container>
-                            </ng-container>
                         </ng-container>
-                    </core-dynamic-component>
+                    </ng-container>
+                </core-dynamic-component>
 
-                    <core-infinite-loading [enabled]="canLoadMore" (action)="showMoreActivities($event)"></core-infinite-loading>
+                <core-infinite-loading [enabled]="canLoadMore" (action)="showMoreActivities($event)"></core-infinite-loading>
-                </div>
+            </div>
-            </core-loading>
+        </core-loading>
-            <ion-buttons padding end class="core-course-section-nav-buttons" *ngIf="displaySectionSelector && sections && sections.length">
+        <ion-buttons padding end class="core-course-section-nav-buttons" *ngIf="displaySectionSelector && sections && sections.length">
-                <button *ngIf="previousSection" ion-button color="light" icon-only (click)="sectionChanged(previousSection)" title="{{ 'core.previous' | translate }}">
+            <button *ngIf="previousSection" ion-button color="light" icon-only (click)="sectionChanged(previousSection)" title="{{ 'core.previous' | translate }}">
-                    <ion-icon name="arrow-back" md="ios-arrow-back"></ion-icon>
+                <ion-icon name="arrow-back" md="ios-arrow-back"></ion-icon>
-                    <core-format-text class="accesshide" [text]="previousSection.formattedName || previousSection.name"></core-format-text>
+                <core-format-text class="accesshide" [text]="previousSection.formattedName || previousSection.name"></core-format-text>
-                </button>
+            </button>
-                <button *ngIf="nextSection" ion-button icon-only (click)="sectionChanged(nextSection)" title="{{ 'core.next' | translate }}">
+            <button *ngIf="nextSection" ion-button icon-only (click)="sectionChanged(nextSection)" title="{{ 'core.next' | translate }}">
-                    <core-format-text class="accesshide" [text]="nextSection.formattedName || nextSection.name"></core-format-text>
+                <core-format-text class="accesshide" [text]="nextSection.formattedName || nextSection.name"></core-format-text>
-                    <ion-icon name="arrow-forward" md="ios-arrow-forward"></ion-icon>
+                <ion-icon name="arrow-forward" md="ios-arrow-forward"></ion-icon>
-                </button>
+            </button>
-            </ion-buttons>
+        </ion-buttons>
 
-        </core-dynamic-component>
+    </core-dynamic-component>
-    </ion-content>
 </core-block-course-blocks>
 
 <!-- Template to render a section. -->

src/core/sitehome/components/index/core-sitehome-index.html

@@ -1,30 +1,28 @@
 <core-block-course-blocks [courseId]="siteHomeId" [downloadEnabled]="downloadEnabled">
-    <ion-content>
+    <core-loading [hideUntil]="dataLoaded">
-        <core-loading [hideUntil]="dataLoaded">
+            <ion-list>
-                <ion-list>
+                <!-- Site home main contents. -->
-                    <!-- Site home main contents. -->
+                <ng-container *ngIf="section && section.hasContent">
-                    <ng-container *ngIf="section && section.hasContent">
+                    <ion-item text-wrap *ngIf="section.summary">
-                        <ion-item text-wrap *ngIf="section.summary">
+                        <core-format-text [text]="section.summary"></core-format-text>
-                            <core-format-text [text]="section.summary"></core-format-text>
+                    </ion-item>
-                        </ion-item>
 
-                        <core-course-module *ngFor="let module of section.modules" [module]="module" [courseId]="siteHomeId" [downloadEnabled]="downloadEnabled" [section]="section"></core-course-module>
+                    <core-course-module *ngFor="let module of section.modules" [module]="module" [courseId]="siteHomeId" [downloadEnabled]="downloadEnabled" [section]="section"></core-course-module>
+                </ng-container>
+
+                <!-- Site home items: news, categories, courses, etc. -->
+                <ng-container *ngIf="items.length > 0">
+                    <ion-item-divider *ngIf="section && section.hasContent"></ion-item-divider>
+                    <ng-container *ngFor="let item of items">
+                        <core-sitehome-all-course-list class="item" *ngIf="item == 'all-course-list'"></core-sitehome-all-course-list>
+                        <core-sitehome-categories  *ngIf="item == 'categories'"></core-sitehome-categories>
+                        <core-sitehome-course-search *ngIf="item == 'course-search'"></core-sitehome-course-search>
+                        <core-sitehome-enrolled-course-list *ngIf="item == 'enrolled-course-list'"></core-sitehome-enrolled-course-list>
+                        <core-sitehome-news *ngIf="item == 'news'"></core-sitehome-news>
                     </ng-container>
+                </ng-container>
+            </ion-list>
 
-                    <!-- Site home items: news, categories, courses, etc. -->
+        <core-empty-box *ngIf="!hasContent" icon="qr-scanner" [message]="'core.course.nocontentavailable' | translate"></core-empty-box>
-                    <ng-container *ngIf="items.length > 0">
+    </core-loading>
-                        <ion-item-divider *ngIf="section && section.hasContent"></ion-item-divider>
-                        <ng-container *ngFor="let item of items">
-                            <core-sitehome-all-course-list class="item" *ngIf="item == 'all-course-list'"></core-sitehome-all-course-list>
-                            <core-sitehome-categories  *ngIf="item == 'categories'"></core-sitehome-categories>
-                            <core-sitehome-course-search *ngIf="item == 'course-search'"></core-sitehome-course-search>
-                            <core-sitehome-enrolled-course-list *ngIf="item == 'enrolled-course-list'"></core-sitehome-enrolled-course-list>
-                            <core-sitehome-news *ngIf="item == 'news'"></core-sitehome-news>
-                        </ng-container>
-                    </ng-container>
-                </ion-list>
-
-            <core-empty-box *ngIf="!hasContent" icon="qr-scanner" [message]="'core.course.nocontentavailable' | translate"></core-empty-box>
-        </core-loading>
-    </ion-content>
 </core-block-course-blocks>

src/providers/utils/dom.ts

@@ -702,6 +702,45 @@ export class CoreDomUtilsProvider {
         return this.instances[id];
     }
 
+    /**
+     * Wait an element to exists using the findFunction.
+     *
+     * @param {Function} findFunction The function used to find the element.
+     * @return {Promise<HTMLElement>} Resolved if found, rejected if too many tries.
+     */
+    waitElementToExist(findFunction: Function): Promise<HTMLElement> {
+        const promiseInterval = {
+            promise: null,
+            resolve: null,
+            reject: null
+        };
+
+        let tries = 100;
+
+        promiseInterval.promise = new Promise((resolve, reject): void => {
+            promiseInterval.resolve = resolve;
+            promiseInterval.reject = reject;
+        });
+
+        const clear = setInterval(() => {
+            const element: HTMLElement = findFunction();
+
+            if (element) {
+                clearInterval(clear);
+                promiseInterval.resolve(element);
+            } else {
+                tries--;
+
+                if (tries <= 0) {
+                    clearInterval(clear);
+                    promiseInterval.reject();
+                }
+            }
+        }, 100);
+
+        return promiseInterval.promise;
+    }
+
     /**
      * Handle bootstrap tooltips in a certain element.
      *

src/theme/format-text.scss

@@ -9,6 +9,10 @@ ion-app.app-root core-rich-text-editor .core-rte-editor {
     margin-bottom: 1rem;
   }
 
+  .no-overflow {
+    overflow: auto;
+  }
+
   // Fix lists styles in core-format-text.
   ul {
     padding-left: 1rem;