UI: Fixes healthy node listing resize on large portrait screens (#4564)

1. Split the resizing functionality of into a separate mixin to be
shared across components
2. Add basic integration tests to prove that everything is getting
called through out the lifetime of the app. I decided against unit
testing as there isn't really any isolated logic to be tested, more
checking that things are being called in the correct order etc i.e. the
integration is correct.

Adds assertion to with-resizing so its obvious to override `resize`

ui-v2/app/components/list-collection.js

@@ -1,6 +1,32 @@
+import { computed, get } from '@ember/object';
 import Component from 'ember-collection/components/ember-collection';
+import style from 'ember-computed-style';
+import WithResizing from 'consul-ui/mixins/with-resizing';
+import qsaFactory from 'consul-ui/utils/qsa-factory';
+const $$ = qsaFactory();
 
-export default Component.extend({
+export default Component.extend(WithResizing, {
   tagName: 'div',
+  attributeBindings: ['style'],
+  height: 500,
+  style: style('getStyle'),
   classNames: ['list-collection'],
+  getStyle: computed('height', function() {
+    return {
+      height: get(this, 'height'),
+    };
+  }),
+  resize: function(e) {
+    const $self = this.element;
+    const $appContent = [...$$('main > div')][0];
+    if ($appContent) {
+      const rect = $self.getBoundingClientRect();
+      const $footer = [...$$('footer[role="contentinfo"]')][0];
+      const space = rect.top + $footer.clientHeight;
+      const height = e.detail.height - space;
+      this.set('height', Math.max(0, height));
+      this.updateItems();
+      this.updateScrollPosition();
+    }
+  },
 });

ui-v2/app/components/tabular-collection.js

@@ -3,6 +3,7 @@ import needsRevalidate from 'ember-collection/utils/needs-revalidate';
 import identity from 'ember-collection/utils/identity';
 import Grid from 'ember-collection/layouts/grid';
 import SlotsMixin from 'ember-block-slots';
+import WithResizing from 'consul-ui/mixins/with-resizing';
 import style from 'ember-computed-style';
 import qsaFactory from 'consul-ui/utils/qsa-factory';
 
@@ -21,14 +22,6 @@ import { computed, get, set } from '@ember/object';
 
 // ember doesn't like you using `$` hence `$$`
 const $$ = qsaFactory();
-// basic pseudo CustomEvent interface
-// TODO: use actual custom events once I've reminded
-// myself re: support/polyfills
-const createSizeEvent = function(detail) {
-  return {
-    detail: { width: window.innerWidth, height: window.innerHeight },
-  };
-};
 // need to copy Cell in wholesale as there is no way to import it
 // there is no change made to `Cell` here, its only here as its
 // private in `ember-collection`
@@ -136,7 +129,7 @@ const change = function(e) {
     }
   }
 };
-export default Component.extend(SlotsMixin, {
+export default Component.extend(SlotsMixin, WithResizing, {
   tagName: 'table',
   attributeBindings: ['style'],
   width: 1150,
@@ -149,47 +142,31 @@ export default Component.extend(SlotsMixin, {
     this.confirming = [];
     // TODO: The row height should auto calculate properly from the CSS
     this['cell-layout'] = new ZIndexedGrid(get(this, 'width'), 50);
-    this.handler = () => {
-      this.resize(createSizeEvent());
-    };
   },
   getStyle: computed('height', function() {
     return {
       height: get(this, 'height'),
     };
   }),
-  willRender: function() {
-    this._super(...arguments);
-    this.set('hasActions', this._isRegistered('actions'));
-  },
-  didInsertElement: function() {
-    this._super(...arguments);
-    // TODO: Consider moving all DOM lookups here
-    // this seems to be the earliest place I can get them
-    window.addEventListener('resize', this.handler);
-    this.didAppear();
-  },
-  willDestroyElement: function() {
-    window.removeEventListener('resize', this.handler);
-  },
-  didAppear: function() {
-    this.handler();
-  },
   resize: function(e) {
     const $tbody = [...$$('tbody', this.element)][0];
     const $appContent = [...$$('main > div')][0];
     if ($appContent) {
       const rect = $tbody.getBoundingClientRect();
       const $footer = [...$$('footer[role="contentinfo"]')][0];
       const space = rect.top + $footer.clientHeight;
-      const height = new Number(e.detail.height - space);
+      const height = e.detail.height - space;
       this.set('height', Math.max(0, height));
       // TODO: The row height should auto calculate properly from the CSS
       this['cell-layout'] = new ZIndexedGrid($appContent.clientWidth, 50);
       this.updateItems();
       this.updateScrollPosition();
     }
   },
+  willRender: function() {
+    this._super(...arguments);
+    this.set('hasActions', this._isRegistered('actions'));
+  },
   // `ember-collection` bug workaround
   // https://github.com/emberjs/ember-collection/issues/138
   _needsRevalidate: function() {

ui-v2/app/mixins/with-resizing.js

@@ -0,0 +1,30 @@
+import Mixin from '@ember/object/mixin';
+import { get } from '@ember/object';
+import { assert } from '@ember/debug';
+export default Mixin.create({
+  resize: function(e) {
+   assert('with-resizing.resize needs to be overridden', false);
+  },
+  win: window,
+  init: function() {
+    this._super(...arguments);
+    this.handler = e => {
+      const win = e.target;
+      this.resize({
+        detail: { width: win.innerWidth, height: win.innerHeight },
+      });
+    };
+  },
+  didInsertElement: function() {
+    this._super(...arguments);
+    get(this, 'win').addEventListener('resize', this.handler);
+    this.didAppear();
+  },
+  didAppear: function() {
+    this.handler({ target: get(this, 'win') });
+  },
+  willDestroyElement: function() {
+    get(this, 'win').removeEventListener('resize', this.handler);
+    this._super(...arguments);
+  },
+});

ui-v2/app/styles/components/list-collection.scss

@@ -9,7 +9,7 @@
 .healthy > div {
   width: calc(100% + 23px);
 }
-%card-grid {
+.unhealthy > div {
   margin-bottom: 20px;
 }
 %card-grid > ul,

ui-v2/tests/integration/mixins/with-resizing-test.js

@@ -0,0 +1,26 @@
+import { module } from 'qunit';
+import test from 'ember-sinon-qunit/test-support/test';
+import { setupTest } from 'ember-qunit';
+import EmberObject from '@ember/object';
+import Mixin from 'consul-ui/mixins/with-resizing';
+module('Integration | Mixin | with-resizing', function(hooks) {
+  setupTest(hooks);
+  test('window.addEventListener, resize and window.removeEventListener are called once each through the entire lifecycle', function(assert) {
+    const win = {
+      innerWidth: 0,
+      innerHeight: 0,
+      addEventListener: this.stub(),
+      removeEventListener: this.stub(),
+    };
+    const subject = EmberObject.extend(Mixin, {
+      win: win,
+    }).create();
+    const resize = this.stub(subject, 'resize');
+    subject.didInsertElement();
+    subject.willDestroyElement();
+    assert.ok(win.addEventListener.calledOnce);
+    assert.ok(resize.calledOnce);
+    assert.ok(resize.calledWith({ detail: { width: 0, height: 0 } }));
+    assert.ok(win.removeEventListener.calledOnce);
+  });
+});

ui-v2/tests/unit/mixins/with-resizing-test.js

@@ -0,0 +1,12 @@
+import EmberObject from '@ember/object';
+import WithResizingMixin from 'consul-ui/mixins/with-resizing';
+import { module, test } from 'qunit';
+
+module('Unit | Mixin | with resizing');
+
+// Replace this with your real tests.
+test('it works', function(assert) {
+  let WithResizingObject = EmberObject.extend(WithResizingMixin);
+  let subject = WithResizingObject.create();
+  assert.ok(subject);
+});