feat(dialog): add backdrop (#1041)

* feat(dialog): add backdrop

* rebase on sync overlay

* fix lint errors

* fix typos

src/lib/core/overlay/overlay-ref.ts

@@ -1,35 +1,51 @@
 import {PortalHost, Portal} from '../portal/portal';
 import {OverlayState} from './overlay-state';
+import {Observable} from 'rxjs/Observable';
+import {Subject} from 'rxjs/Subject';
+
 
 /**
  * Reference to an overlay that has been created with the Overlay service.
  * Used to manipulate or dispose of said overlay.
  */
 export class OverlayRef implements PortalHost {
+  private _backdropElement: HTMLElement = null;
+  private _backdropClick: Subject<any> = new Subject();
+
   constructor(
       private _portalHost: PortalHost,
       private _pane: HTMLElement,
       private _state: OverlayState) { }
 
   attach(portal: Portal<any>): any {
+    if (this._state.hasBackdrop) {
+      this._attachBackdrop();
+    }
+
     let attachResult = this._portalHost.attach(portal);
     this.updatePosition();
 
     return attachResult;
   }
 
   detach(): Promise<any> {
+    this._detatchBackdrop();
     return this._portalHost.detach();
   }
 
   dispose(): void {
+    this._detatchBackdrop();
     this._portalHost.dispose();
   }
 
   hasAttached(): boolean {
     return this._portalHost.hasAttached();
   }
 
+  backdropClick(): Observable<void> {
+    return this._backdropClick.asObservable();
+  }
+
   /** Gets the current state config of the overlay. */
   getState() {
     return this._state;
@@ -42,5 +58,40 @@ export class OverlayRef implements PortalHost {
     }
   }
 
-  // TODO(jelbourn): add additional methods for manipulating the overlay.
+  /** Attaches a backdrop for this overlay. */
+  private _attachBackdrop() {
+    this._backdropElement = document.createElement('div');
+    this._backdropElement.classList.add('md-overlay-backdrop');
+    this._pane.parentElement.appendChild(this._backdropElement);
+
+    // Forward backdrop clicks such that the consumer of the overlay can perform whatever
+    // action desired when such a click occurs (usually closing the overlay).
+    this._backdropElement.addEventListener('click', () => {
+      this._backdropClick.next(null);
+    });
+
+    // Add class to fade-in the backdrop after one frame.
+    requestAnimationFrame(() => {
+      this._backdropElement.classList.add('md-overlay-backdrop-showing');
+    });
+  }
+
+  /** Detaches the backdrop (if any) associated with the overlay. */
+  private _detatchBackdrop(): void {
+    let backdropToDetach = this._backdropElement;
+
+    if (backdropToDetach) {
+      backdropToDetach.classList.remove('md-overlay-backdrop-showing');
+      backdropToDetach.addEventListener('transitionend', () => {
+        backdropToDetach.parentNode.removeChild(backdropToDetach);
+
+        // It is possible that a new portal has been attached to this overlay since we started
+        // removing the backdrop. If that is the case, only clear the backdrop reference if it
+        // is still the same instance that we started to remove.
+        if (this._backdropElement == backdropToDetach) {
+          this._backdropElement = null;
+        }
+      });
+    }
+  }
 }

src/lib/core/overlay/overlay-state.ts

@@ -9,6 +9,9 @@ export class OverlayState {
   /** Strategy with which to position the overlay. */
   positionStrategy: PositionStrategy;
 
+  /** Whether the overlay has a backdrop. */
+  hasBackdrop: boolean = false;
+
   // TODO(jelbourn): configuration still to add
   // - overlay size
   // - focus trap

src/lib/core/overlay/overlay.scss

@@ -1,3 +1,8 @@
+@import 'variables';
+@import 'palette';
+
+$md-backdrop-color: md-color($md-grey, 900);
+
 // TODO(jelbourn): change from the `md` prefix to something else for everything in the toolkit.
 
 @import 'variables';
@@ -14,12 +19,35 @@
   left: 0;
   height: 100%;
   width: 100%;
+  z-index: $md-z-index-overlay-container;
 }
 
 /** A single overlay pane. */
 .md-overlay-pane {
   position: absolute;
   pointer-events: auto;
   box-sizing: border-box;
-  z-index: $z-index-overlay;
+  z-index: $md-z-index-overlay;
+}
+
+.md-overlay-backdrop {
+  // TODO(jelbourn): reuse sidenav fullscreen mixin.
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+
+  z-index: $md-z-index-overlay-backdrop;
+  pointer-events: auto;
+
+  // TODO(jelbourn): figure out if there are actually spec'ed colors for both light and dark
+  // themes here. Currently using the values from Angular Material 1.
+  transition: opacity $swift-ease-out-duration $swift-ease-out-timing-function;
+  background: $md-backdrop-color;
+  opacity: 0;
+}
+
+.md-overlay-backdrop.md-overlay-backdrop-showing {
+  opacity: 0.48;
 }

src/lib/core/overlay/overlay.spec.ts

@@ -1,4 +1,4 @@
-import {inject, TestBed, async} from '@angular/core/testing';
+import {inject, TestBed, async, ComponentFixture} from '@angular/core/testing';
 import {NgModule, Component, ViewChild, ViewContainerRef} from '@angular/core';
 import {TemplatePortalDirective, PortalModule} from '../portal/portal-directives';
 import {TemplatePortal, ComponentPortal} from '../portal/portal';
@@ -14,6 +14,7 @@ describe('Overlay', () => {
   let componentPortal: ComponentPortal<PizzaMsg>;
   let templatePortal: TemplatePortal;
   let overlayContainerElement: HTMLElement;
+  let viewContainerFixture: ComponentFixture<TestComponentWithTemplatePortals>;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
@@ -36,6 +37,7 @@ describe('Overlay', () => {
     fixture.detectChanges();
     templatePortal = fixture.componentInstance.templatePortal;
     componentPortal = new ComponentPortal(PizzaMsg, fixture.componentInstance.viewContainerRef);
+    viewContainerFixture = fixture;
   }));
 
   it('should load a component into an overlay', () => {
@@ -80,7 +82,7 @@ describe('Overlay', () => {
     expect(overlayContainerElement.textContent).toBe('');
   });
 
-  describe('applyState', () => {
+  describe('positioning', () => {
     let state: OverlayState;
 
     beforeEach(() => {
@@ -95,6 +97,27 @@ describe('Overlay', () => {
       expect(overlayContainerElement.querySelectorAll('.fake-positioned').length).toBe(1);
     });
   });
+
+  describe('backdrop', () => {
+    it('should create and destroy an overlay backdrop', () => {
+      let config = new OverlayState();
+      config.hasBackdrop = true;
+
+      let overlayRef = overlay.create(config);
+      overlayRef.attach(componentPortal);
+
+      viewContainerFixture.detectChanges();
+      let backdrop = <HTMLElement> overlayContainerElement.querySelector('.md-overlay-backdrop');
+      expect(backdrop).toBeTruthy();
+      expect(backdrop.classList).not.toContain('.md-overlay-backdrop-showing');
+
+      let backdropClickHandler = jasmine.createSpy('backdropClickHander');
+      overlayRef.backdropClick().subscribe(backdropClickHandler);
+
+      backdrop.click();
+      expect(backdropClickHandler).toHaveBeenCalled();
+    });
+  });
 });
 
 

src/lib/core/style/_variables.scss

@@ -10,9 +10,15 @@ $md-xsmall: 'max-width: 600px';
 
 // TODO: Revisit all z-indices before beta
 // z-index master list
+
 $z-index-fab: 20 !default;
 $z-index-drawer: 100 !default;
-$z-index-overlay: 1000 !default;
+
+// Overlay z indices.
+$md-z-index-overlay: 1000;
+$md-z-index-overlay-container: 1;
+$md-z-index-overlay-backdrop: 1;
+
 
 // Global constants
 $pi: 3.14159265;

src/lib/dialog/dialog.spec.ts

@@ -76,8 +76,6 @@ describe('MdDialog', () => {
 
     viewContainerFixture.detectChanges();
 
-    viewContainerFixture.detectChanges();
-
     let afterCloseResult: string;
     dialogRef.afterClosed().subscribe(result => {
       afterCloseResult = result;
@@ -88,6 +86,20 @@ describe('MdDialog', () => {
     expect(afterCloseResult).toBe('Charmander');
     expect(overlayContainerElement.querySelector('md-dialog-container')).toBeNull();
   });
+
+  it('should close when clicking on the overlay backdrop', () => {
+    let config = new MdDialogConfig();
+    config.viewContainerRef = testViewContainerRef;
+
+    dialog.open(PizzaMsg, config);
+
+    viewContainerFixture.detectChanges();
+
+    let backdrop = <HTMLElement> overlayContainerElement.querySelector('.md-overlay-backdrop');
+    backdrop.click();
+
+    expect(overlayContainerElement.querySelector('md-dialog-container')).toBeFalsy();
+  });
 });
 
 

src/lib/dialog/dialog.ts

@@ -87,6 +87,9 @@ export class MdDialog {
     // to modify and close it.
     let dialogRef = <MdDialogRef<T>> new MdDialogRef(overlayRef);
 
+    // When the dialog backdrop is clicked, we want to close it.
+    overlayRef.backdropClick().subscribe(() => dialogRef.close());
+
     // We create an injector specifically for the component we're instantiating so that it can
     // inject the MdDialogRef. This allows a component loaded inside of a dialog to close itself
     // and, optionally, to return a value.
@@ -108,6 +111,7 @@ export class MdDialog {
   private _getOverlayState(dialogConfig: MdDialogConfig): OverlayState {
     let state = new OverlayState();
 
+    state.hasBackdrop = true;
     state.positionStrategy = this._overlay.position()
         .global()
         .centerHorizontally()