feat(autocomplete): add autocomplete panel toggling

src/demo-app/autocomplete/autocomplete-demo.html

@@ -1,3 +1,9 @@
 <div class="demo-autocomplete">
-  <md-autocomplete></md-autocomplete>
+  <md-input-container>
+    <input mdInput placeholder="State" [mdAutocomplete]="auto">
+  </md-input-container>
+
+  <md-autocomplete #auto="mdAutocomplete">
+    <md-option *ngFor="let state of states" [value]="state.code"> {{ state.name }} </md-option>
+  </md-autocomplete>
 </div>

src/demo-app/autocomplete/autocomplete-demo.ts

@@ -6,4 +6,33 @@ import {Component} from '@angular/core';
   templateUrl: 'autocomplete-demo.html',
   styleUrls: ['autocomplete-demo.css'],
 })
-export class AutocompleteDemo {}
+export class AutocompleteDemo {
+  states = [
+    {code: 'AL', name: 'Alabama'},
+    {code: 'AZ', name: 'Arizona'},
+    {code: 'CA', name: 'California'},
+    {code: 'CO', name: 'Colorado'},
+    {code: 'CT', name: 'Connecticut'},
+    {code: 'FL', name: 'Florida'},
+    {code: 'GA', name: 'Georgia'},
+    {code: 'ID', name: 'Idaho'},
+    {code: 'KS', name: 'Kansas'},
+    {code: 'LA', name: 'Louisiana'},
+    {code: 'MA', name: 'Massachusetts'},
+    {code: 'MN', name: 'Minnesota'},
+    {code: 'MI', name: 'Mississippi'},
+    {code: 'NY', name: 'New York'},
+    {code: 'NC', name: 'North Carolina'},
+    {code: 'OK', name: 'Oklahoma'},
+    {code: 'OH', name: 'Ohio'},
+    {code: 'OR', name: 'Oregon'},
+    {code: 'PA', name: 'Pennsylvania'},
+    {code: 'SC', name: 'South Carolina'},
+    {code: 'TN', name: 'Tennessee'},
+    {code: 'TX', name: 'Texas'},
+    {code: 'VA', name: 'Virginia'},
+    {code: 'WA', name: 'Washington'},
+    {code: 'WI', name: 'Wisconsin'},
+    {code: 'WY', name: 'Wyoming'},
+  ];
+}

src/lib/autocomplete/_autocomplete-theme.scss

@@ -1,5 +1,16 @@
 @import '../core/theming/theming';
 
 @mixin md-autocomplete-theme($theme) {
+  $foreground: map-get($theme, foreground);
+  $background: map-get($theme, background);
 
+  md-option {
+    background: md-color($background, card);
+    color: md-color($foreground, text);
+
+    &.md-selected {
+      background: md-color($background, card);
+      color: md-color($foreground, text);
+    }
+  }
 }

src/lib/autocomplete/autocomplete-trigger.ts

@@ -0,0 +1,114 @@
+import {Directive, ElementRef, Input, ViewContainerRef, OnDestroy} from '@angular/core';
+import {Overlay, OverlayRef, OverlayState, TemplatePortal} from '../core';
+import {MdAutocomplete} from './autocomplete';
+import {PositionStrategy} from '../core/overlay/position/position-strategy';
+import {Observable} from 'rxjs/Observable';
+import {Subscription} from 'rxjs/Subscription';
+import 'rxjs/add/observable/merge';
+
+/** The panel needs a slight y-offset to ensure the input underline displays. */
+export const MD_AUTOCOMPLETE_PANEL_OFFSET = 6;
+
+@Directive({
+  selector: 'input[mdAutocomplete], input[matAutocomplete]',
+  host: {
+    '(focus)': 'openPanel()'
+  }
+})
+export class MdAutocompleteTrigger implements OnDestroy {
+  private _overlayRef: OverlayRef;
+  private _portal: TemplatePortal;
+  private _panelOpen: boolean = false;
+
+  /** The subscription to events that close the autocomplete panel. */
+  private _closingActionsSubscription: Subscription;
+
+  /* The autocomplete panel to be attached to this trigger. */
+  @Input('mdAutocomplete') autocomplete: MdAutocomplete;
+
+  constructor(private _element: ElementRef, private _overlay: Overlay,
+              private _viewContainerRef: ViewContainerRef) {}
+
+  ngOnDestroy() { this._destroyPanel(); }
+
+  /* Whether or not the autocomplete panel is open. */
+  get panelOpen(): boolean {
+    return this._panelOpen;
+  }
+
+  /** Opens the autocomplete suggestion panel. */
+  openPanel(): void {
+    if (!this._overlayRef) {
+      this._createOverlay();
+    }
+
+    if (!this._overlayRef.hasAttached()) {
+      this._overlayRef.attach(this._portal);
+      this._closingActionsSubscription =
+          this.panelClosingActions.subscribe(() => this.closePanel());
+    }
+
+    this._panelOpen = true;
+  }
+
+  /** Closes the autocomplete suggestion panel. */
+  closePanel(): void {
+    if (this._overlayRef && this._overlayRef.hasAttached()) {
+      this._overlayRef.detach();
+    }
+
+    this._closingActionsSubscription.unsubscribe();
+    this._panelOpen = false;
+  }
+
+  /**
+   * A stream of actions that should close the autocomplete panel, including
+   * when an option is selected and when the backdrop is clicked.
+   */
+  get panelClosingActions(): Observable<any> {
+    // TODO(kara): add tab event observable with keyboard event PR
+    return Observable.merge(...this.optionSelections, this._overlayRef.backdropClick());
+  }
+
+  /** Stream of autocomplete option selections. */
+  get optionSelections(): Observable<any>[] {
+    return this.autocomplete.options.map(option => option.onSelect);
+  }
+
+  /** Destroys the autocomplete suggestion panel. */
+  private _destroyPanel(): void {
+    if (this._overlayRef) {
+      this.closePanel();
+      this._overlayRef.dispose();
+      this._overlayRef = null;
+    }
+  }
+
+  private _createOverlay(): void {
+    this._portal = new TemplatePortal(this.autocomplete.template, this._viewContainerRef);
+    this._overlayRef = this._overlay.create(this._getOverlayConfig());
+  }
+
+  private _getOverlayConfig(): OverlayState {
+    const overlayState = new OverlayState();
+    overlayState.positionStrategy = this._getOverlayPosition();
+    overlayState.width = this._getHostWidth();
+    overlayState.hasBackdrop = true;
+    overlayState.backdropClass = 'md-overlay-transparent-backdrop';
+    return overlayState;
+  }
+
+  private _getOverlayPosition(): PositionStrategy {
+    return this._overlay.position().connectedTo(
+        this._element,
+        {originX: 'start', originY: 'bottom'}, {overlayX: 'start', overlayY: 'top'})
+        .withOffsetY(MD_AUTOCOMPLETE_PANEL_OFFSET);
+  }
+
+  /** Returns the width of the input element, so the panel width can match it. */
+  private _getHostWidth(): number {
+    return this._element.nativeElement.getBoundingClientRect().width;
+  }
+
+}
+

src/lib/autocomplete/autocomplete.html

@@ -1 +1,5 @@
-I'm an autocomplete!
+<template>
+  <div class="md-autocomplete-panel">
+    <ng-content></ng-content>
+  </div>
+</template>

src/lib/autocomplete/autocomplete.scss

@@ -0,0 +1,5 @@
+@import '../core/style/menu-common';
+
+.md-autocomplete-panel {
+  @include md-menu-base();
+}

src/lib/autocomplete/autocomplete.spec.ts

@@ -1,29 +1,184 @@
-import {TestBed, async} from '@angular/core/testing';
-import {Component} from '@angular/core';
-import {MdAutocompleteModule} from './index';
+import {TestBed, async, ComponentFixture} from '@angular/core/testing';
+import {Component, ViewChild} from '@angular/core';
+import {By} from '@angular/platform-browser';
+import {MdAutocompleteModule, MdAutocompleteTrigger} from './index';
+import {OverlayContainer} from '../core/overlay/overlay-container';
+import {MdInputModule} from '../input/index';
 
 describe('MdAutocomplete', () => {
+  let overlayContainerElement: HTMLElement;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      imports: [MdAutocompleteModule.forRoot()],
+      imports: [MdAutocompleteModule.forRoot(), MdInputModule.forRoot()],
       declarations: [SimpleAutocomplete],
-      providers: []
+      providers: [
+        {provide: OverlayContainer, useFactory: () => {
+          overlayContainerElement = document.createElement('div');
+          document.body.appendChild(overlayContainerElement);
+
+          // remove body padding to keep consistent cross-browser
+          document.body.style.padding = '0';
+          document.body.style.margin = '0';
+
+          return {getContainerElement: () => overlayContainerElement};
+        }},
+      ]
     });
 
     TestBed.compileComponents();
   }));
 
-  it('should have a test', () => {
-    expect(true).toBe(true);
+  describe('panel toggling', () => {
+    let fixture: ComponentFixture<SimpleAutocomplete>;
+    let trigger: HTMLElement;
+
+    beforeEach(() => {
+      fixture = TestBed.createComponent(SimpleAutocomplete);
+      fixture.detectChanges();
+
+      trigger = fixture.debugElement.query(By.css('input')).nativeElement;
+    });
+
+    it('should open the panel when the input is focused', () => {
+      expect(fixture.componentInstance.trigger.panelOpen).toBe(false);
+      dispatchEvent('focus', trigger);
+      fixture.detectChanges();
+
+      expect(fixture.componentInstance.trigger.panelOpen)
+          .toBe(true, `Expected panel state to read open when input is focused.`);
+      expect(overlayContainerElement.textContent)
+          .toContain('Alabama', `Expected panel to display when input is focused.`);
+      expect(overlayContainerElement.textContent)
+          .toContain('California', `Expected panel to display when input is focused.`);
+    });
+
+    it('should open the panel programmatically', () => {
+      expect(fixture.componentInstance.trigger.panelOpen).toBe(false);
+      fixture.componentInstance.trigger.openPanel();
+      fixture.detectChanges();
+
+      expect(fixture.componentInstance.trigger.panelOpen)
+          .toBe(true, `Expected panel state to read open when opened programmatically.`);
+      expect(overlayContainerElement.textContent)
+          .toContain('Alabama', `Expected panel to display when opened programmatically.`);
+      expect(overlayContainerElement.textContent)
+          .toContain('California', `Expected panel to display when opened programmatically.`);
+    });
+
+    it('should close the panel when a click occurs outside it', async(() => {
+      dispatchEvent('focus', trigger);
+      fixture.detectChanges();
+
+      const backdrop =
+          overlayContainerElement.querySelector('.cdk-overlay-backdrop') as HTMLElement;
+      backdrop.click();
+      fixture.detectChanges();
+
+      fixture.whenStable().then(() => {
+        expect(fixture.componentInstance.trigger.panelOpen)
+            .toBe(false, `Expected clicking outside the panel to set its state to closed.`);
+        expect(overlayContainerElement.textContent)
+            .toEqual('', `Expected clicking outside the panel to close the panel.`);
+      });
+    }));
+
+    it('should close the panel when an option is clicked', async(() => {
+      dispatchEvent('focus', trigger);
+      fixture.detectChanges();
+
+      const option = overlayContainerElement.querySelector('md-option') as HTMLElement;
+      option.click();
+      fixture.detectChanges();
+
+      fixture.whenStable().then(() => {
+        expect(fixture.componentInstance.trigger.panelOpen)
+            .toBe(false, `Expected clicking an option to set the panel state to closed.`);
+        expect(overlayContainerElement.textContent)
+            .toEqual('', `Expected clicking an option to close the panel.`);
+      });
+    }));
+
+    it('should close the panel when a newly created option is clicked', async(() => {
+      fixture.componentInstance.states.unshift({code: 'TEST', name: 'test'});
+      fixture.detectChanges();
+
+      dispatchEvent('focus', trigger);
+      fixture.detectChanges();
+
+      const option = overlayContainerElement.querySelector('md-option') as HTMLElement;
+      option.click();
+      fixture.detectChanges();
+
+      fixture.whenStable().then(() => {
+        expect(fixture.componentInstance.trigger.panelOpen)
+            .toBe(false, `Expected clicking a new option to set the panel state to closed.`);
+        expect(overlayContainerElement.textContent)
+            .toEqual('', `Expected clicking a new option to close the panel.`);
+      });
+    }));
+
+    it('should close the panel programmatically', async(() => {
+      fixture.componentInstance.trigger.openPanel();
+      fixture.detectChanges();
+
+      fixture.componentInstance.trigger.closePanel();
+      fixture.detectChanges();
+
+      fixture.whenStable().then(() => {
+        expect(fixture.componentInstance.trigger.panelOpen)
+            .toBe(false, `Expected closing programmatically to set the panel state to closed.`);
+        expect(overlayContainerElement.textContent)
+            .toEqual('', `Expected closing programmatically to close the panel.`);
+      });
+    }));
+
   });
 
 });
 
 @Component({
   template: `
-    <md-autocomplete></md-autocomplete>
+    <md-input-container>
+      <input mdInput placeholder="State" [mdAutocomplete]="auto">
+    </md-input-container>
+  
+    <md-autocomplete #auto="mdAutocomplete">
+      <md-option *ngFor="let state of states" [value]="state.code"> {{ state.name }} </md-option>
+    </md-autocomplete>
   `
 })
-class SimpleAutocomplete {}
+class SimpleAutocomplete {
+  @ViewChild(MdAutocompleteTrigger) trigger: MdAutocompleteTrigger;
+
+  states = [
+    {code: 'AL', name: 'Alabama'},
+    {code: 'CA', name: 'California'},
+    {code: 'FL', name: 'Florida'},
+    {code: 'KS', name: 'Kansas'},
+    {code: 'MA', name: 'Massachusetts'},
+    {code: 'NY', name: 'New York'},
+    {code: 'OR', name: 'Oregon'},
+    {code: 'PA', name: 'Pennsylvania'},
+    {code: 'TN', name: 'Tennessee'},
+    {code: 'VA', name: 'Virginia'},
+    {code: 'WY', name: 'Wyoming'},
+  ];
+}
+
+
+/**
+ * TODO: Move this to core testing utility until Angular has event faking
+ * support.
+ *
+ * Dispatches an event from an element.
+ * @param eventName Name of the event
+ * @param element The element from which the event will be dispatched.
+ */
+function dispatchEvent(eventName: string, element: HTMLElement): void {
+  let event  = document.createEvent('Event');
+  event.initEvent(eventName, true, true);
+  element.dispatchEvent(event);
+}
+