feat(dialog): add events (observables) for open & closeAll (#2522)

* added afterOpen & afterAllClosed observables to NgDialog + tests + demo

* typo

* fixed demo for aot

* removed unused src argument in dialog demo

* added viewContainerRef to dialog open tests

* reworked dialog closeAll & open events based on feedback

* added comment to change commit to the right username

* added types for afterOpen & afterAllClosed

* _afterAllClosed and _afterOpen subjects now delegate to state of parentDialog  & removed spaces from inside import braces

* fixed tslint error in dialog.ts

src/demo-app/demo-app-module.ts

@@ -8,7 +8,7 @@ import {MaterialModule, OverlayContainer,
   FullscreenOverlayContainer} from '@angular/material';
 import {DEMO_APP_ROUTES} from './demo-app/routes';
 import {ProgressBarDemo} from './progress-bar/progress-bar-demo';
-import {JazzDialog, ContentElementDialog, DialogDemo} from './dialog/dialog-demo';
+import {JazzDialog, ContentElementDialog, DialogDemo, IFrameDialog} from './dialog/dialog-demo';
 import {RippleDemo} from './ripple/ripple-demo';
 import {IconDemo} from './icon/icon-demo';
 import {GesturesDemo} from './gestures/gestures-demo';
@@ -65,6 +65,7 @@ import {InputContainerDemo} from './input/input-container-demo';
     InputContainerDemo,
     JazzDialog,
     ContentElementDialog,
+    IFrameDialog,
     ListDemo,
     LiveAnnouncerDemo,
     MdCheckboxDemoNestedChecklist,
@@ -100,6 +101,7 @@ import {InputContainerDemo} from './input/input-container-demo';
     DemoApp,
     JazzDialog,
     ContentElementDialog,
+    IFrameDialog,
     RotiniPanel,
     ScienceJoke,
     SpagettiPanel,

src/demo-app/dialog/dialog-demo.ts

@@ -1,4 +1,5 @@
-import {Component} from '@angular/core';
+import {Component, Inject} from '@angular/core';
+import {DOCUMENT} from '@angular/platform-browser';
 import {MdDialog, MdDialogRef, MdDialogConfig} from '@angular/material';
 
 @Component({
@@ -23,7 +24,19 @@ export class DialogDemo {
     }
   };
 
-  constructor(public dialog: MdDialog) { }
+  constructor(public dialog: MdDialog, @Inject(DOCUMENT) doc: any) {
+    // Possible useful example for the open and closeAll events.
+    // Adding a class to the body if a dialog opens and
+    // removing it after all open dialogs are closed
+    dialog.afterOpen.subscribe((ref: MdDialogRef<any>) => {
+      if (!doc.body.classList.contains('no-scroll')) {
+        doc.body.classList.add('no-scroll');
+      }
+    });
+    dialog.afterAllClosed.subscribe(() => {
+      doc.body.classList.remove('no-scroll');
+    });
+  }
 
   openJazz() {
     this.dialogRef = this.dialog.open(JazzDialog, this.config);
@@ -91,9 +104,46 @@ export class JazzDialog {
         color="primary"
         href="https://en.wikipedia.org/wiki/Neptune"
         target="_blank">Read more on Wikipedia</a>
+      
+      <button
+        md-button
+        color="secondary"
+        (click)="showInStackedDialog()">
+        Show in Dialog</button>
     </md-dialog-actions>
   `
 })
 export class ContentElementDialog {
   actionsAlignment: string;
+
+  constructor(public dialog: MdDialog) { }
+
+  showInStackedDialog() {
+    this.dialog.open(IFrameDialog);
+  }
+}
+
+@Component({
+  selector: 'demo-iframe-dialog',
+  styles: [
+    `iframe {
+      width: 800px;
+    }`
+  ],
+  template: `
+    <h2 md-dialog-title>Neptune</h2>
+
+    <md-dialog-content>
+      <iframe frameborder="0" src="https://en.wikipedia.org/wiki/Neptune"></iframe>
+    </md-dialog-content>
+
+    <md-dialog-actions>
+      <button
+        md-raised-button
+        color="primary"
+        md-dialog-close>Close</button>
+    </md-dialog-actions>
+  `
+})
+export class IFrameDialog {
 }

src/lib/dialog/dialog.spec.ts

@@ -150,6 +150,35 @@ describe('MdDialog', () => {
     expect(overlayContainerElement.querySelector('md-dialog-container')).toBeFalsy();
   });
 
+  it('should notify the observers if a dialog has been opened', () => {
+    let ref: MdDialogRef<PizzaMsg>;
+    dialog.afterOpen.subscribe(r => {
+      ref = r;
+    });
+    expect(dialog.open(PizzaMsg, {
+      viewContainerRef: testViewContainerRef
+    })).toBe(ref);
+  });
+
+  it('should notify the observers if all open dialogs have finished closing', () => {
+    const ref1 = dialog.open(PizzaMsg, {
+      viewContainerRef: testViewContainerRef
+    });
+    const ref2 = dialog.open(ContentElementDialog, {
+      viewContainerRef: testViewContainerRef
+    });
+    let allClosed = false;
+
+    dialog.afterAllClosed.subscribe(() => {
+      allClosed = true;
+    });
+
+    ref1.close();
+    expect(allClosed).toBeFalsy();
+    ref2.close();
+    expect(allClosed).toBeTruthy();
+  });
+
   it('should should override the width of the overlay pane', () => {
     dialog.open(PizzaMsg, {
       width: '500px'

src/lib/dialog/dialog.ts

@@ -1,4 +1,6 @@
 import {Injector, ComponentRef, Injectable, Optional, SkipSelf} from '@angular/core';
+import {Observable} from 'rxjs/Observable';
+import {Subject} from 'rxjs/Subject';
 
 import {Overlay, OverlayRef, ComponentType, OverlayState, ComponentPortal} from '../core';
 import {extendObject} from '../core/util/object-extend';
@@ -20,12 +22,30 @@ import {MdDialogContainer} from './dialog-container';
 @Injectable()
 export class MdDialog {
   private _openDialogsAtThisLevel: MdDialogRef<any>[] = [];
+  private _afterAllClosedAtThisLevel = new Subject<void>();
+  private _afterOpenAtThisLevel = new Subject<MdDialogRef<any>>();
 
   /** Keeps track of the currently-open dialogs. */
   get _openDialogs(): MdDialogRef<any>[] {
     return this._parentDialog ? this._parentDialog._openDialogs : this._openDialogsAtThisLevel;
   }
 
+  /** Subject for notifying the user that all open dialogs have finished closing. */
+  get _afterOpen(): Subject<MdDialogRef<any>> {
+    return this._parentDialog ? this._parentDialog._afterOpen : this._afterOpenAtThisLevel;
+  }
+  /** Subject for notifying the user that a dialog has opened. */
+  get _afterAllClosed(): Subject<void> {
+    return this._parentDialog ?
+      this._parentDialog._afterAllClosed : this._afterAllClosedAtThisLevel;
+  }
+
+  /** Gets an observable that is notified when a dialog has been opened. */
+  afterOpen: Observable<MdDialogRef<any>> = this._afterOpen.asObservable();
+
+  /** Gets an observable that is notified when all open dialog have finished closing. */
+  afterAllClosed: Observable<void> = this._afterAllClosed.asObservable();
+
   constructor(
       private _overlay: Overlay,
       private _injector: Injector,
@@ -46,6 +66,7 @@ export class MdDialog {
 
     this._openDialogs.push(dialogRef);
     dialogRef.afterClosed().subscribe(() => this._removeOpenDialog(dialogRef));
+    this._afterOpen.next(dialogRef);
 
     return dialogRef;
   }
@@ -169,6 +190,11 @@ export class MdDialog {
 
     if (index > -1) {
       this._openDialogs.splice(index, 1);
+
+      // no open dialogs are left, call next on afterAllClosed Subject
+      if (!this._openDialogs.length) {
+        this._afterAllClosed.next();
+      }
     }
   }
 }