Added sky adapter service

src/app/app-extras.module.ts

@@ -7,13 +7,15 @@ import {
 } from './demos/dynamic-component/dynamic-component-example.component';
 
 import {
+  SkyCoreAdapterModule,
   SkyDynamicComponentModule,
   SkyMediaQueryModule,
   SkyNumericModule
 } from './public';
 
 @NgModule({
   exports: [
+    SkyCoreAdapterModule,
     SkyDynamicComponentModule,
     SkyMediaQueryModule,
     SkyNumericModule

src/app/public/modules/adapter-service/adapter.module.ts

@@ -0,0 +1,14 @@
+import {
+  NgModule
+} from '@angular/core';
+
+import {
+  SkyCoreAdapterService
+} from './adapter.service';
+
+@NgModule({
+  providers: [
+    SkyCoreAdapterService
+  ]
+})
+export class SkyCoreAdapterModule { }

src/app/public/modules/adapter-service/adapter.service.ts

@@ -0,0 +1,165 @@
+import {
+  ElementRef,
+  Injectable,
+  Renderer2,
+  RendererFactory2
+} from '@angular/core';
+
+import {
+  SkyMediaBreakpoints
+} from '../media-query';
+
+const SKY_TABBABLE_SELECTOR = [
+  'a[href]',
+  'area[href]',
+  'input:not([disabled]):not([tabindex=\'-1\'])',
+  'button:not([disabled]):not([tabindex=\'-1\'])',
+  'select:not([disabled]):not([tabindex=\'-1\'])',
+  'textarea:not([disabled]):not([tabindex=\'-1\'])',
+  'iframe',
+  'object',
+  'embed',
+  '*[tabindex]:not([tabindex=\'-1\'])',
+  '*[contenteditable=true]'
+].join(', ');
+
+@Injectable()
+export class SkyCoreAdapterService {
+
+  private renderer: Renderer2;
+
+  constructor(
+    private rendererFactory: RendererFactory2
+  ) {
+    this.renderer = this.rendererFactory.createRenderer(undefined, undefined);
+  }
+
+  /**
+   * Set the responsive container CSS class for a given element.
+   *
+   * @param {ElementRef} elementRef - The element that will recieve the new CSS class.
+   * @param {SkyMediaBreakpoints} breakpoint - The SkyMediaBreakpoint will determine which class
+   * gets set. For example a SkyMediaBreakpoint of `xs` will set a CSS class of `sky-responsive-container-xs`.
+   */
+  public setResponsiveContainerClass(elementRef: ElementRef, breakpoint: SkyMediaBreakpoints): void {
+    const nativeEl: HTMLElement = elementRef.nativeElement;
+
+    this.renderer.removeClass(nativeEl, 'sky-responsive-container-xs');
+    this.renderer.removeClass(nativeEl, 'sky-responsive-container-sm');
+    this.renderer.removeClass(nativeEl, 'sky-responsive-container-md');
+    this.renderer.removeClass(nativeEl, 'sky-responsive-container-lg');
+
+    let newClass: string;
+
+    switch (breakpoint) {
+      case SkyMediaBreakpoints.xs: {
+        newClass = 'sky-responsive-container-xs';
+        break;
+      }
+      case SkyMediaBreakpoints.sm: {
+        newClass = 'sky-responsive-container-sm';
+        break;
+      }
+      case SkyMediaBreakpoints.md: {
+        newClass = 'sky-responsive-container-md';
+        break;
+      }
+      default: {
+        newClass = 'sky-responsive-container-lg';
+        break;
+      }
+    }
+
+    this.renderer.addClass(nativeEl, newClass);
+  }
+
+  /**
+   * This method temporarily enables/disables pointer events.
+   * This is helpful to prevent iFrames from interfering with drag events.
+   *
+   * @param {boolean} enable - Set to `true` to enable pointer events. Set to `false` to disable.
+   */
+  public toggleIframePointerEvents(enable: boolean): void {
+    const iframes = document.querySelectorAll('iframe');
+    for (let i = 0; i < iframes.length; i++) {
+      // Setting to empty string will allow iframe to fall back to its prior CSS assignment.
+      iframes[i].style.pointerEvents = enable ? '' : 'none';
+    }
+  }
+
+  /**
+   * Focuses on the first element found with an `autofocus` attribute inside the supplied `elementRef`.
+   *
+   * @param {ElementRef} elementRef - The element to search within.
+   * @return {boolean} Returns `true` if a child element with autofocus is found.
+   */
+  public applyAutoFocus(elementRef: ElementRef): boolean {
+    const elementWithAutoFocus = elementRef.nativeElement.querySelector('[autofocus]');
+
+    // Child was found with the autofocus property. Set focus and return true.
+    if (elementWithAutoFocus) {
+      elementWithAutoFocus.focus();
+      return true;
+    }
+
+    // No children were found with autofocus property. Return false.
+    return false;
+  }
+
+  /**
+   * Sets focus on the first focusable child of the `elementRef` parameter.
+   * If no focusable children are found, and `focusOnContainerIfNoChildrenFound` is `true`,
+   * focus will be set on the container element.
+   *
+   * @param {ElementRef} elementRef - The element to search within.
+   * @param {string} containerSelector - A CSS selector indicating the container that should
+   * recieve focus if no focusable children are found.
+   * @param {boolean} focusOnContainerIfNoChildrenFound - It set to `true`, the container will
+   * recieve focus if no focusable children are found.
+   */
+  public getFocusableChildrenAndApplyFocus(
+    elementRef: ElementRef,
+    containerSelector: string,
+    focusOnContainerIfNoChildrenFound: boolean = false
+  ): void {
+    const containerElement = elementRef.nativeElement.querySelector(containerSelector);
+    const focusableChildren = this.loadFocusableChildren(containerElement);
+
+    // Focus first focusable child if available. Otherwise, set focus on container.
+    if (!this.focusFirstElement(focusableChildren) && focusOnContainerIfNoChildrenFound) {
+      containerElement.focus();
+    }
+  }
+
+  private focusFirstElement(list: Array<HTMLElement>): boolean {
+    if (list.length > 0) {
+      list[0].focus();
+      return true;
+    }
+    return false;
+  }
+
+  private loadFocusableChildren(element: HTMLElement): HTMLElement[] {
+    const elements: Array<HTMLElement>
+      = Array.prototype.slice.call(element.querySelectorAll(SKY_TABBABLE_SELECTOR));
+
+    return elements.filter((el) => {
+      return this.isVisible(el);
+    });
+  }
+
+  private isVisible(element: HTMLElement): boolean {
+    const style = window.getComputedStyle(element);
+    const isHidden = style.display === 'none' || style.visibility === 'hidden';
+    if (isHidden) {
+      return false;
+    }
+
+    const hasBounds = !!(
+      element.offsetWidth ||
+      element.offsetHeight ||
+      element.getClientRects().length
+    );
+    return hasBounds;
+  }
+}

src/app/public/modules/adapter-service/index.ts

@@ -0,0 +1,2 @@
+export * from './adapter.module';
+export * from './adapter.service';

src/app/public/modules/index.ts

@@ -1,3 +1,4 @@
+export * from './adapter-service';
 export * from './dynamic-component';
 export * from './format';
 export * from './log';