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feat(): add slide-toggle component.
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‎src/components/slide-toggle/README.md‎

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# MdSlideToggle
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`MdSlideToggle` is a two-state control, which can be also called `switch`
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### Screenshots
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![image](https://cloud.githubusercontent.com/assets/4987015/14860895/25cc0dc0-0cab-11e6-9e57-9f6d513444b1.png)
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## `<md-slide-toggle>`
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### Bound Properties
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| Name | Type | Description |
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| --- | --- | --- |
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| `disabled` | boolean | Disables the `slide-toggle` |
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### Examples
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A basic slide-toggle would have the following markup.
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```html
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<md-slide-toggle [(ngModel)]="slideToggleModel">
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Default Slide Toggle
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</md-slide-toggle>
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```
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Slide toggle can be also disabled.
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```html
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<md-slide-toggle disabled>
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Disabled Slide Toggle
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</md-slide-toggle>
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```
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## Theming
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A slide-toggle is default using the `accent` palette for its styling.
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Modifiying the color on a `slide-toggle` can be easily done, by using the following classes.
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- `md-primary`
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- `md-warn`
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Here is an example markup, which uses the primary color.
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```html
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<md-slide-toggle class="md-primary">
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Primary Slide Toggle
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</md-slide-toggle>
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```
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‎src/components/slide-toggle/slide-toggle.html‎

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<div class="md-container">
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<div class="md-bar"></div>
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<div class="md-thumb-container">
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<div class="md-thumb"></div>
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</div>
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</div>
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<div class="md-label">
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<ng-content></ng-content>
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</div>

‎src/components/slide-toggle/slide-toggle.scss‎

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@import "../../core/style/variables";
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@import "../../core/style/mixins";
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@import "../../core/style/elevation";
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//TODO(): remove the default theme.
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@import "../../core/style/default-theme";
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$md-slide-toggle-width: 36px !default;
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$md-slide-toggle-height: 24px !default;
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$md-slide-toggle-bar-height: 14px !default;
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$md-slide-toggle-thumb-size: 20px !default;
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$md-slide-toggle-margin: 16px !default;
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:host {
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display: flex;
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height: $md-slide-toggle-height;
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margin: $md-slide-toggle-margin 0;
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line-height: $md-slide-toggle-height;
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white-space: nowrap;
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cursor: pointer;
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user-select: none;
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outline: none;
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&[disabled] {
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cursor: default;
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.md-container {
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cursor: default;
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}
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}
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.md-container {
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cursor: grab;
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width: $md-slide-toggle-width;
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height: $md-slide-toggle-height;
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position: relative;
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user-select: none;
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margin-right: 8px;
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}
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.md-thumb-container {
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position: absolute;
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top: $md-slide-toggle-height / 2 - $md-slide-toggle-thumb-size / 2;
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left: 0;
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z-index: 1;
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width: $md-slide-toggle-width - $md-slide-toggle-thumb-size;
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transform: translate3d(0, 0, 0);
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transition: $swift-linear;
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transition-property: transform;
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.md-thumb {
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position: absolute;
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margin: 0;
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left: 0;
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top: 0;
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height: $md-slide-toggle-thumb-size;
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width: $md-slide-toggle-thumb-size;
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border-radius: 50%;
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background-color: md-color($md-background, background);
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@include md-elevation(1);
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}
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}
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&.md-checked .md-thumb-container {
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transform: translate3d(100%, 0, 0);
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}
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&.md-dragging .md-container {
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cursor: grabbing;
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}
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.md-bar {
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position: absolute;
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left: 1px;
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top: $md-slide-toggle-height / 2 - $md-slide-toggle-bar-height / 2;
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width: $md-slide-toggle-width - 2px;
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height: $md-slide-toggle-bar-height;
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background-color: md-color($md-grey, 500);
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border-radius: 8px;
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}
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.md-bar,
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.md-thumb {
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transition: $swift-linear;
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transition-property: background-color;
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transition-delay: 0.05s;
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}
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@mixin md-switch-checked($palette) {
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.md-thumb {
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background-color: md-color($palette);
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}
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.md-bar {
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background-color: md-color($palette, 0.5);
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}
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}
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&.md-checked {
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@include md-switch-checked($md-accent);
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&.md-primary {
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@include md-switch-checked($md-primary);
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}
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&.md-warn {
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@include md-switch-checked($md-warn);
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}
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}
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&[disabled] {
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.md-thumb {
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background-color: md-color($md-grey, 400);
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}
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.md-bar {
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background-color: md-color($md-foreground, divider);
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}
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}
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}

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

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import {
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it,
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describe,
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expect,
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beforeEach,
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inject,
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} from '@angular/core/testing';
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import {TestComponentBuilder} from '@angular/compiler/testing';
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import {By} from '@angular/platform-browser';
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import {Component} from '@angular/core';
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import {MdSlideToggle} from './slide-toggle';
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export function main() {
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describe('MdSlideToggle', () => {
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let builder: TestComponentBuilder;
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beforeEach(inject([TestComponentBuilder], (tcb: TestComponentBuilder) => {
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builder = tcb;
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}));
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it('should update the model correctly', (done: () => void) => {
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return builder.createAsync(TestApp).then((fixture) => {
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let testComponent = fixture.debugElement.componentInstance;
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let slideToggleEl = fixture.debugElement.query(By.css('md-slide-toggle')).nativeElement;
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fixture.detectChanges();
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expect(slideToggleEl.classList.contains('md-checked')).toBe(false);
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testComponent.slideModel = true;
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fixture.detectChanges();
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expect(slideToggleEl.classList.contains('md-checked')).toBe(true);
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done();
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});
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});
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it('should correctly update aria-disabled', (done: () => void) => {
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return builder.createAsync(TestApp).then((fixture) => {
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let testComponent = fixture.debugElement.componentInstance;
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let slideToggleEl = fixture.debugElement.query(By.css('md-slide-toggle')).nativeElement;
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fixture.detectChanges();
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expect(slideToggleEl.getAttribute('aria-disabled')).toBe('false');
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testComponent.isDisabled = true;
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fixture.detectChanges();
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expect(slideToggleEl.getAttribute('aria-disabled')).toBe('true');
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done();
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});
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});
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it('should correctly update aria-checked', (done: () => void) => {
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return builder.createAsync(TestApp).then((fixture) => {
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let testComponent = fixture.debugElement.componentInstance;
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let slideToggleEl = fixture.debugElement.query(By.css('md-slide-toggle')).nativeElement;
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fixture.detectChanges();
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expect(slideToggleEl.getAttribute('aria-checked')).toBe('false');
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testComponent.slideModel = true;
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fixture.detectChanges();
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expect(slideToggleEl.getAttribute('aria-checked')).toBe('true');
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done();
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});
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});
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it('should set the toggle to checked on click', (done: () => void) => {
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return builder.createAsync(TestApp).then((fixture) => {
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let slideToggleEl = fixture.debugElement.query(By.css('md-slide-toggle')).nativeElement;
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slideToggleEl.click();
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expect(slideToggleEl.classList.contains('md-checked')).toBe(true);
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done();
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});
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});
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});
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}
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@Component({
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selector: 'test-app',
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template: `
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<md-slide-toggle [(ngModel)]="slideModel" [disabled]="isDisabled">
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<span>Test Slide Toggle</span>
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</md-slide-toggle>
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`,
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directives: [MdSlideToggle]
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})
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class TestApp {
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isDisabled: boolean = false;
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slideModel: boolean = false;
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}

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

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import {
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Component,
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ElementRef,
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OnInit,
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Optional,
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Renderer
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} from '@angular/core';
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import {
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ControlValueAccessor,
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NgControl
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} from '@angular/common';
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@Component({
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selector: 'md-slide-toggle',
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inputs: ['disabled'],
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host: {
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'[attr.aria-disabled]': 'isAriaDisabled()',
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'(click)': 'onClick()'
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},
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templateUrl: './components/slide-toggle/slide-toggle.html',
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styleUrls: ['./components/slide-toggle/slide-toggle.css']
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})
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export class MdSlideToggle implements OnInit, ControlValueAccessor {
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private nativeElement: HTMLElement;
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private switchContainer: HTMLElement;
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private thumbContainer: HTMLElement;
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private onChange = (_: any) => {};
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private onTouched = () => {};
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private _checked: any;
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private _disabled: boolean;
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constructor(elementRef: ElementRef,
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private renderer: Renderer,
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@Optional() ngControl: NgControl) {
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this.nativeElement = elementRef.nativeElement;
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if (ngControl) {
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ngControl.valueAccessor = this;
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}
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}
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ngOnInit() {
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this.switchContainer = <HTMLElement> this.nativeElement.querySelector('.md-container');
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this.thumbContainer = <HTMLElement> this.nativeElement.querySelector('.md-thumb-container');
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}
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onClick() {
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if (!this.disabled) {
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this.checked = !this.checked;
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this.onTouched();
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}
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}
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writeValue(value: any): void {
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this.checked = value;
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}
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registerOnChange(fn: any): void {
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this.onChange = fn;
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}
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registerOnTouched(fn: any): void {
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this.onTouched = fn;
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}
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isAriaDisabled(): string {
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return this.disabled ? 'true' : 'false';
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}
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get disabled(): string | boolean {
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return this._disabled;
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}
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set disabled(value: string | boolean) {
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this._disabled = value === '' || !!value;
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this.renderer
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.setElementAttribute(this.nativeElement, 'disabled', this._disabled ? 'true' : null);
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}
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get checked() {
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return !!this._checked;
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}
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set checked(value) {
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this._checked = !!value;
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this.onTouched();
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// Update the ngModel value accessor.
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this.onChange(this._checked);
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this.renderer
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.setElementAttribute(this.nativeElement, 'aria-checked', this._checked);
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this.nativeElement.classList.toggle('md-checked', this.checked);
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}
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}

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