Creates a banner alerts component to handle banner notifications

wherehows-web/app/components/application/banner-alerts.ts

@@ -0,0 +1,49 @@
+import Component from '@ember/component';
+import { inject as service } from '@ember/service';
+import { computed, get, set } from '@ember/object';
+import ComputedProperty from '@ember/object/computed';
+import BannerService, { IBanner } from 'wherehows-web/services/banners';
+
+export default class BannerAlerts extends Component {
+  /**
+   * Imports the service used to handle actual activation and dismissal of banners. The service also
+   * maintains the banners list
+   * @type {Serivce}
+   */
+  banners: ComputedProperty<BannerService> = service();
+
+  /**
+   * Sets the tagname for the html element rendered by this component
+   */
+  tagName = 'section';
+
+  /**
+   * Sets the classnames to attach to the html element rendered by this component
+   */
+  classNames = ['banner-alerts'];
+
+  /**
+   * Binds classnames to specific truthy values of properties on this component
+   */
+  classNameBindings = ['isShowingBanners:banner-alerts--show:banner-alerts--hide'];
+
+  /**
+   * References the banners service computation on whether or not we should be showing banners
+   */
+  isShowingBanners: ComputedProperty<boolean> = computed.alias('banners.isShowingBanners');
+
+  actions = {
+    /**
+     * Triggered by the user by clicking the dismiss icon on the banner, triggers the exiting state on the
+     * topmost (first in queue) banner and starts the timer/css animation for the dismissal action
+     * @param this - explicit this declaration for typescript
+     * @param {IBanner} banner - the banner as a subject for the dismissal action
+     */
+    onDismissBanner(this: BannerAlerts, banner: IBanner) {
+      const banners = get(this, 'banners');
+
+      set(banner, 'isExiting', true);
+      banners.dequeue();
+    }
+  };
+}

wherehows-web/app/controllers/application.js

@@ -22,6 +22,12 @@ export default Controller.extend({
 
   notifications: service(),
 
+  /**
+   * Adds the service for banners in order to trigger the application to render the banners when
+   * they are triggered
+   */
+  banners: service(),
+
   init() {
     this._super(...arguments);
 

wherehows-web/app/services/banners.ts

@@ -0,0 +1,87 @@
+import Service from '@ember/service';
+import { computed, get } from '@ember/object';
+import { NotificationEvent } from 'wherehows-web/services/notifications';
+import { delay } from 'wherehows-web/utils/promise-delay';
+
+/**
+ * Expected properties to be found on a basic banner object added to our list
+ */
+export interface IBanner {
+  content: string;
+  type: NotificationEvent;
+  isExiting: boolean;
+  isDismissable: boolean;
+  iconName: string;
+}
+
+/**
+ * When creating a new banner, helps to determine whether that banner isDismissable
+ */
+const isDismissableMap: { [key: string]: boolean } = {
+  [NotificationEvent['info']]: true,
+  [NotificationEvent['confirm']]: true,
+  [NotificationEvent['error']]: false
+};
+
+/**
+ * When creating a new banner, helps to determine the kind of font awesome icon indicator will be on
+ * the left side of the banner
+ */
+const iconNameMap: { [key: string]: string } = {
+  [NotificationEvent['info']]: 'info-circle',
+  [NotificationEvent['confirm']]: 'exclamation-circle',
+  [NotificationEvent['error']]: 'times-circle'
+};
+
+export default class BannerService extends Service {
+  /**
+   * Our cached list of banner objects to be rendered
+   * @type {Array<IBanner>}
+   */
+  banners: Array<IBanner> = [];
+
+  /**
+   * Computes the banners list elements to toggle the isShowingBanners flag, which not only activates the
+   * banner component but also triggers the navbar and app-container body to shift up/down to accommodate
+   * for the banner component space
+   * @type {ComputedProperty<boolean>}
+   */
+  isShowingBanners = computed('banners.@each.isExiting', function() {
+    const banners = get(this, 'banners');
+    // Note: If we have no banners, flag should always be false. If we have more than one banner, flag
+    // should always be true, BUT if we only have one banner and it is in an exiting state we can go ahead
+    // and trigger this to be false to line up with the animation
+    return banners.length > 0 && (banners.length > 1 || !banners[0].isExiting);
+  });
+
+  /**
+   * Method to actually take care of removing the first banner from our queue.
+   */
+  async dequeue(): Promise<void> {
+    // Note: Since dequeuing the banner will remove it from the DOM, we don't want to actually dequeue
+    // until the removal animation, which takes 0.7 seconds, is completed.
+    const animationSpeed = 0.8;
+    const dismissDelay = delay(animationSpeed);
+    const banners = get(this, 'banners');
+
+    await dismissDelay;
+    banners.removeAt(0, 1);
+  }
+
+  /**
+   * Method to add the banner to our queue. Takes the content and type of banner and creates a
+   * standardized interface that our servie can understand
+   * @param message - the message to put in the banner's content box
+   * @param {NotificationEvent} type - what type of banner notification we are going for (which will
+   *  determine the appearance and interaction properties)
+   */
+  addBanner(message: string, type: NotificationEvent = NotificationEvent['info']): void {
+    get(this, 'banners').addObject({
+      type,
+      content: message,
+      isExiting: false,
+      isDismissable: isDismissableMap[type],
+      iconName: iconNameMap[type]
+    });
+  }
+}

wherehows-web/app/styles/base/_base.scss

@@ -11,13 +11,21 @@ html {
  * Apply padding to top and bottom to account for navigation and footer
  */
 body {
-  padding-top: $nav-min-height;
-  padding-bottom: $nav-min-height;
   background-color: set-color(white, base);
   overflow-y: scroll;
   overflow-x: hidden;
 }
 
+.app-container {
+  margin-top: $nav-min-height;
+  margin-bottom: $nav-min-height;
+  transition: margin 0.7s ease;
+
+  &.banner-alert-offset {
+    margin-top: $nav-min-height + 52px;
+  }
+}
+
 /**
  * Make all elements from the DOM inherit from the parent box-sizing
  * Since `*` has a specificity of 0, it does not override the `html` value

wherehows-web/app/styles/components/_all.scss

@@ -1,5 +1,6 @@
 @import 'navbar';
 @import 'hero';
+@import 'application/all';
 @import 'avatar/all';
 @import 'dataset-author/all';
 @import 'dataset-compliance/all';

wherehows-web/app/styles/components/_navbar.scss

@@ -11,6 +11,7 @@ $item-spacing: 10px;
    * Explicitly sets the .navbar min-height to a shared value
    */
   min-height: $nav-min-height;
+  transition: top 0.7s ease;
 
   &-inverse {
     /**
@@ -32,6 +33,10 @@ $item-spacing: 10px;
       }
     }
   }
+
+  &.navbar-top-offset {
+    top: 52px;
+  }
 }
 
 /**

wherehows-web/app/styles/components/application/_all.scss

@@ -0,0 +1 @@
+@import 'banner-alerts';

wherehows-web/app/styles/components/application/_banner-alerts.scss

@@ -0,0 +1,82 @@
+.banner-alerts {
+  position: fixed;
+  top: 0;
+  width: 100vw;
+  transition: height 0.6s ease;
+  overflow: hidden;
+
+  &--show {
+    height: 52px;
+  }
+
+  &--hide {
+    height: 0;
+  }
+
+  .banner-alert {
+    transition: height 0.6s ease;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    min-width: 1128px;
+    overflow: hidden;
+    padding: 8px 24px;
+    display: flex;
+    flex-wrap: nowrap;
+    align-items: center;
+    color: get-color(white);
+    min-height: 0;
+
+    &--active {
+      height: 52px;
+    }
+
+    &--exiting {
+      height: 0;
+      padding: 0 24px;
+    }
+
+    &--info {
+      background-color: get-color(slate6);
+      border-bottom: 1px solid get-color(slate3, 0.5);
+    }
+
+    &--confirm {
+      background-color: get-color(orange5);
+      border-bottom: 1px solid get-color(orange3, 0.5);
+    }
+
+    &--error {
+      background-color: get-color(red5);
+      border-bottom: 1px solid get-color(red3, 0.5);
+    }
+
+    &:first-child {
+      z-index: 999;
+    }
+
+    &:nth-child(2) {
+      z-index: 99;
+    }
+
+    &:nth-child(n + 3) {
+      z-index: 1;
+    }
+
+    &__icon {
+      margin-right: 16px;
+    }
+
+    &__content {
+      width: 90vw;
+      min-width: 1056px;
+    }
+
+    &__dismiss {
+      background-color: transparent;
+      border: none;
+      cursor: pointer;
+    }
+  }
+}

wherehows-web/app/templates/application.hbs

@@ -1,18 +1,22 @@
 {{#if session.isAuthenticated}}
+  {{application/banner-alerts}}
+
   {{partial "navbar"}}
 
-  {{#hero-container}}
-    <header class="nacho-hero__header">
-      Search for datasets, metrics and flows
-    </header>
-    <section class="nacho-hero__content">
-      {{search-bar-form didSearch=(action "didSearch")}}
-    </section>
-  {{/hero-container}}
+  <div class="app-container {{if banners.isShowingBanners "banner-alert-offset"}}">
+    {{#hero-container}}
+      <header class="nacho-hero__header">
+        Search for datasets, metrics and flows
+      </header>
+      <section class="nacho-hero__content">
+        {{search-bar-form didSearch=(action "didSearch")}}
+      </section>
+    {{/hero-container}}
 
-  <section class="container-fluid">
-    {{partial "main"}}
-  </section>
+    <section class="container-fluid">
+      {{partial "main"}}
+    </section>
+  </div>
 
   {{notifications-service service=notifications}}
 {{else}}

wherehows-web/app/templates/components/application/banner-alerts.hbs

@@ -0,0 +1,13 @@
+{{#each banners.banners as |banner|}}
+  <div class="banner-alert {{if banner.isExiting "banner-alert--exiting" "banner-alert--active"}} banner-alert--{{banner.type}}">
+    {{fa-icon banner.iconName class="banner-alert__icon"}}
+    <div class="banner-alert__content">
+      {{banner.content}}
+    </div>
+    {{#if banner.isDismissable}}
+      <button {{action "onDismissBanner" banner}} class="banner-alert__dismiss">
+        {{fa-icon "close"}}
+      </button>
+    {{/if}}
+  </div>
+{{/each}}

wherehows-web/app/templates/navbar.hbs

@@ -1,4 +1,4 @@
-<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
+<nav class="navbar navbar-inverse navbar-fixed-top {{if banners.isShowingBanners "navbar-top-offset"}}" role="navigation">
   <div class="container">
     <div class="navbar-header">
       <button class="navbar-toggle collapsed" aria-expanded="false" aria-controls="navbar">

wherehows-web/tests/integration/components/application/banner-alerts-test.js

@@ -0,0 +1,56 @@
+import { moduleForComponent, test } from 'ember-qunit';
+import Service from '@ember/service';
+import hbs from 'htmlbars-inline-precompile';
+
+const banners = [
+  {
+    content: 'He told ne enough! He told me you killed him!',
+    type: 'info',
+    isExiting: false,
+    isDimissable: true,
+    iconName: 'info-circle'
+  },
+  {
+    content: 'No, Luke, I am your father',
+    type: 'confirm',
+    isExiting: false,
+    isDimissable: true,
+    iconName: 'exclamation-circle'
+  }
+];
+
+// Stubbing the banner service to use in the integration test
+const bannersStub = Service.extend({
+  banners,
+  dequeue() {
+    return true;
+  }
+});
+
+moduleForComponent('application/banner-alerts', 'Integration | Component | application/banner alerts', {
+  integration: true,
+  beforeEach() {
+    this.register('service:banners', bannersStub);
+    this.inject.service('banners', { as: 'banners' });
+  }
+});
+
+const bannerAlertClass = '.banner-alert';
+
+test('it renders', function(assert) {
+  this.render(hbs`{{application/banner-alerts}}`);
+  assert.ok(this.$(), 'Renders without errors');
+});
+
+test('it renders the correct information', function(assert) {
+  this.render(hbs`{{application/banner-alerts}}`);
+  assert.equal(this.$(bannerAlertClass).length, 2, 'Renders the correct amount of banners');
+  assert.equal(
+    this.$(`${bannerAlertClass}__content:eq(0)`)
+      .text()
+      .trim(),
+    banners[0].content,
+    'Renders the correct text'
+  );
+  assert.equal(this.$(`.fa-${banners[0].iconName}`).length, 1, 'Renders the correct types of banners');
+});

wherehows-web/tests/unit/services/banners-test.js

@@ -0,0 +1,23 @@
+import { moduleFor, test } from 'ember-qunit';
+
+moduleFor('service:banners', 'Unit | Service | banners', {});
+
+test('it exists', function(assert) {
+  const service = this.subject();
+  assert.ok(service, 'Existence is a good start');
+});
+
+test('it operates correctly', function(assert) {
+  const service = this.subject();
+  const message = 'Ash Ketchum from Pallet Town';
+
+  service.addBanner('Ash Ketchum from Pallet Town', 'info');
+
+  assert.equal(service.banners.length, 1, 'Created a banner');
+  assert.equal(service.banners[0].content, message, 'Creates a banner with the right message');
+  assert.equal(service.banners[0].isDismissable, true, 'Creates a banner with the right dismiss');
+
+  service.dequeue().then(() => {
+    assert.equal(service.banners.length, 0, 'Removes a banner correctly');
+  });
+});