fix: add event object for slide-toggle and checkbox. (#554)

* update(): add event object for slide-toggle and checkbox.

Closes #552.

* Fix Linters... again :P

* update(): Address comments from @jelborun

src/components/checkbox/checkbox.spec.ts

@@ -11,7 +11,7 @@ import {FORM_DIRECTIVES, NgModel, NgControl} from '@angular/common';
 import {TestComponentBuilder, ComponentFixture} from '@angular/compiler/testing';
 import {Component, DebugElement} from '@angular/core';
 import {By} from '@angular/platform-browser';
-import {MdCheckbox} from './checkbox';
+import {MdCheckbox, MdCheckboxChange} from './checkbox';
 import {PromiseCompleter} from '@angular2-material/core/async/promise-completer';
 
 
@@ -273,26 +273,24 @@ describe('MdCheckbox', () => {
         testComponent = fixture.debugElement.componentInstance;
         inputElement = <HTMLInputElement>checkboxNativeElement.querySelector('input');
         labelElement = <HTMLLabelElement>checkboxNativeElement.querySelector('label');
-
-        spyOn(testComponent, 'handleChange');
       });
     }));
 
     it('should call the change event on first change after initialization', fakeAsync(() => {
       fixture.detectChanges();
-      expect(testComponent.handleChange).not.toHaveBeenCalled();
+      expect(testComponent.lastEvent).toBeUndefined();
 
       checkboxInstance.checked = true;
       fixture.detectChanges();
 
       tick();
 
-      expect(testComponent.handleChange).toHaveBeenCalledTimes(1);
-      expect(testComponent.handleChange).toHaveBeenCalledWith(true);
+      expect(testComponent.lastEvent.checked).toBe(true);
     }));
 
     it('should not emit a DOM event to the change output', async(() => {
-      expect(testComponent.handleChange).not.toHaveBeenCalled();
+      fixture.detectChanges();
+      expect(testComponent.lastEvent).toBeUndefined();
 
       // Trigger the click on the inputElement, because the input will probably
       // emit a DOM event to the change output.
@@ -303,8 +301,7 @@ describe('MdCheckbox', () => {
         // We're checking the arguments type / emitted value to be a boolean, because sometimes the
         // emitted value can be a DOM Event, which is not valid.
         // See angular/angular#4059
-        expect(testComponent.handleChange).toHaveBeenCalledTimes(1);
-        expect(testComponent.handleChange).toHaveBeenCalledWith(true);
+        expect(testComponent.lastEvent.checked).toBe(true);
       });
 
     }));
@@ -541,8 +538,8 @@ class CheckboxWithNameAttribute {}
 /** Simple test component with change event */
 @Component({
   directives: [MdCheckbox],
-  template: `<md-checkbox (change)="handleChange($event)"></md-checkbox>`
+  template: `<md-checkbox (change)="lastEvent = $event"></md-checkbox>`
 })
 class CheckboxWithChangeEvent {
-  handleChange(value: boolean): void {}
+  lastEvent: MdCheckboxChange;
 }

src/components/checkbox/checkbox.ts

@@ -42,6 +42,12 @@ enum TransitionCheckState {
   Indeterminate
 }
 
+// A simple change event emitted by the MdCheckbox component.
+export class MdCheckboxChange {
+  source: MdCheckbox;
+  checked: boolean;
+}
+
 /**
  * A material design checkbox component. Supports all of the functionality of an HTML5 checkbox,
  * and exposes a similar API. An MdCheckbox can be either checked, unchecked, indeterminate, or
@@ -105,7 +111,7 @@ export class MdCheckbox implements AfterContentInit, ControlValueAccessor {
   @Input() name: string = null;
 
   /** Event emitted when the checkbox's `checked` value changes. */
-  @Output() change: EventEmitter<boolean> = new EventEmitter<boolean>();
+  @Output() change: EventEmitter<MdCheckboxChange> = new EventEmitter<MdCheckboxChange>();
 
   /** Called when the checkbox is blurred. Needed to properly implement ControlValueAccessor. */
   onTouched: () => any = () => {};
@@ -144,7 +150,7 @@ export class MdCheckbox implements AfterContentInit, ControlValueAccessor {
 
       // Only fire a change event if this isn't the first time the checked property is ever set.
       if (this._isInitialized) {
-        this.change.emit(this._checked);
+        this._emitChangeEvent();
       }
     }
   }
@@ -225,6 +231,14 @@ export class MdCheckbox implements AfterContentInit, ControlValueAccessor {
     }
   }
 
+  private _emitChangeEvent() {
+    let event = new MdCheckboxChange();
+    event.source = this;
+    event.checked = this.checked;
+
+    this.change.emit(event);
+  }
+
   /**
    * Informs the component when the input has focus so that we can style accordingly
    * @internal
@@ -258,7 +272,7 @@ export class MdCheckbox implements AfterContentInit, ControlValueAccessor {
   onInteractionEvent(event: Event) {
     // We always have to stop propagation on the change event.
     // Otherwise the change event, from the input element, will bubble up and
-    // emit its event object to the `change` output. 
+    // emit its event object to the `change` output.
     event.stopPropagation();
 
     if (!this.disabled) {

src/components/radio/radio.spec.ts

@@ -324,20 +324,19 @@ describe('MdRadio', () => {
         radioInstances = radioDebugElements.map(debugEl => debugEl.componentInstance);
 
         fixture.detectChanges();
-
-        spyOn(testComponent, 'onChange');
       });
     }));
 
     it('should update the model before firing change event', fakeAsync(() => {
       expect(testComponent.modelValue).toBeUndefined();
+      expect(testComponent.lastEvent).toBeUndefined();
 
       groupInstance.value = 'chocolate';
       fixture.detectChanges();
 
       tick();
       expect(testComponent.modelValue).toBe('chocolate');
-      expect(testComponent.onChange).toHaveBeenCalledWith('chocolate');
+      expect(testComponent.lastEvent.value).toBe('chocolate');
     }));
   });
 
@@ -432,7 +431,7 @@ class StandaloneRadioButtons { }
 @Component({
   directives: [MD_RADIO_DIRECTIVES, FORM_DIRECTIVES],
   template: `
-  <md-radio-group [(ngModel)]="modelValue" (change)="onChange(modelValue)">
+  <md-radio-group [(ngModel)]="modelValue" (change)="lastEvent = $event">
     <md-radio-button *ngFor="let option of options" [value]="option.value">
       {{option.label}}
     </md-radio-button>
@@ -446,7 +445,7 @@ class RadioGroupWithNgModel {
     {label: 'Chocolate', value: 'chocolate'},
     {label: 'Strawberry', value: 'strawberry'},
   ];
-  onChange(value: MdRadioChange) {}
+  lastEvent: MdRadioChange;
 }
 
 // TODO(jelbourn): remove eveything below when Angular supports faking events.

src/components/slide-toggle/slide-toggle.spec.ts

@@ -4,13 +4,12 @@ import {
   expect,
   beforeEach,
   inject,
-  async,
-  fakeAsync,
+  async
 } from '@angular/core/testing';
 import {TestComponentBuilder, ComponentFixture} from '@angular/compiler/testing';
 import {By} from '@angular/platform-browser';
 import {Component} from '@angular/core';
-import {MdSlideToggle} from './slide-toggle';
+import {MdSlideToggle, MdSlideToggleChange} from './slide-toggle';
 import {NgControl} from '@angular/common';
 
 describe('MdSlideToggle', () => {
@@ -162,21 +161,21 @@ describe('MdSlideToggle', () => {
       expect(slideToggleElement.classList).not.toContain('ng-dirty');
     });
 
-    it('should emit the new values properly', fakeAsync(() => {
-      spyOn(testComponent, 'onValueChange');
-
+    it('should emit the new values properly', async(() => {
       labelElement.click();
       fixture.detectChanges();
 
       fixture.whenStable().then(() => {
-        expect(testComponent.onValueChange).toHaveBeenCalledTimes(1);
-        expect(testComponent.onValueChange).toHaveBeenCalledWith(true);
+        // We're checking the arguments type / emitted value to be a boolean, because sometimes the
+        // emitted value can be a DOM Event, which is not valid.
+        // See angular/angular#4059
+        expect(testComponent.lastEvent.checked).toBe(true);
       });
     }));
 
     it('should support subscription on the change observable', () => {
-      slideToggle.change.subscribe(value => {
-        expect(value).toBe(true);
+      slideToggle.change.subscribe((event: MdSlideToggleChange) => {
+        expect(event.checked).toBe(true);
       });
 
       slideToggle.toggle();
@@ -269,7 +268,7 @@ function dispatchFocusChangeEvent(eventName: string, element: HTMLElement): void
     <md-slide-toggle [(ngModel)]="slideModel" [disabled]="isDisabled" [color]="slideColor" 
                      [id]="slideId" [checked]="slideChecked" [name]="slideName" 
                      [aria-label]="slideLabel" [ariaLabel]="slideLabel" 
-                     [ariaLabelledby]="slideLabelledBy" (change)="onValueChange($event)">
+                     [ariaLabelledby]="slideLabelledBy" (change)="lastEvent = $event">
       <span>Test Slide Toggle</span>
     </md-slide-toggle>
   `,
@@ -284,6 +283,5 @@ class SlideToggleTestApp {
   slideName: string;
   slideLabel: string;
   slideLabelledBy: string;
-
-  onValueChange(value: boolean): void {};
+  lastEvent: MdSlideToggleChange;
 }

src/components/slide-toggle/slide-toggle.ts

@@ -21,6 +21,12 @@ export const MD_SLIDE_TOGGLE_VALUE_ACCESSOR: any = {
   multi: true
 };
 
+// A simple change event emitted by the MdSlideToggle component.
+export class MdSlideToggleChange {
+  source: MdSlideToggle;
+  checked: boolean;
+}
+
 // Increasing integer for generating unique ids for slide-toggle components.
 let nextId = 0;
 
@@ -59,8 +65,8 @@ export class MdSlideToggle implements ControlValueAccessor {
   @Input() ariaLabel: string = null;
   @Input() ariaLabelledby: string = null;
 
-  @Output('change') private _change: EventEmitter<boolean> = new EventEmitter<boolean>();
-  change: Observable<boolean> = this._change.asObservable();
+  private _change: EventEmitter<MdSlideToggleChange> = new EventEmitter<MdSlideToggleChange>();
+  @Output() change: Observable<MdSlideToggleChange> = this._change.asObservable();
 
   // Returns the unique id for the visual hidden input.
   getInputId = () => `${this.id || this._uniqueId}-input`;
@@ -144,7 +150,7 @@ export class MdSlideToggle implements ControlValueAccessor {
     if (this.checked !== !!value) {
       this._checked = value;
       this.onChange(this._checked);
-      this._change.emit(this._checked);
+      this._emitChangeEvent();
     }
   }
 
@@ -173,6 +179,13 @@ export class MdSlideToggle implements ControlValueAccessor {
     }
   }
 
+  private _emitChangeEvent() {
+    let event = new MdSlideToggleChange();
+    event.source = this;
+    event.checked = this.checked;
+    this._change.emit(event);
+  }
+
 }
 
 export const MD_SLIDE_TOGGLE_DIRECTIVES = [MdSlideToggle];