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feat(): add slide-toggle component. (#362)
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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://material.angularjs.org/material2_assets/slide-toggle/toggles.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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| `color` | `"primary" | "accent" | "warn"` | The color palette of the `slide-toggle` |
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| `checked` | boolean | Sets the value of the `slide-toggle` |
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### Events
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| Name | Type | Description |
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| --- | --- | --- |
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| `change` | boolean | Event will be emitted on every value change.<br/>It emits the new `checked` value. |
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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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The `slide-toggle` can be also set to checked without a `ngModel`
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```html
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<md-slide-toggle [checked]="isChecked">
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Input Binding
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</md-slide-toggle>
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```
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You may also want to listen on changes of the `slide-toggle`<br/>
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The `slide-toggle` always emits the new value to the event binding `(change)`
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```html
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<md-slide-toggle (change)="printValue($event)">
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Prints Value on Change
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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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Modifying the color on a `slide-toggle` can be easily done, by using the following markup.
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```html
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<md-slide-toggle color="primary">
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Primary Slide Toggle
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</md-slide-toggle>
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```
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The color can be also set dynamically by using a property binding.
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```html
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<md-slide-toggle [color]="myColor">
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Dynamic Color
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</md-slide-toggle>
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```

‎src/components/slide-toggle/slide-toggle.html‎

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<label class="md-slide-toggle-label">
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<div class="md-slide-toggle-container">
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<div class="md-slide-toggle-bar"></div>
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<div class="md-slide-toggle-thumb-container">
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<div class="md-slide-toggle-thumb"></div>
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</div>
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<input #input class="md-slide-toggle-checkbox" type="checkbox"
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[id]="getInputId()"
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[tabIndex]="tabIndex"
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[checked]="checked"
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[disabled]="disabled"
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[attr.name]="name"
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[attr.aria-label]="ariaLabel"
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[attr.aria-labelledby]="ariaLabelledby"
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(blur)="onTouched()"
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(change)="onChangeEvent()">
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</div>
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<span class="md-slide-toggle-content">
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<ng-content></ng-content>
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</span>
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</label>

‎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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$md-slide-toggle-margin: 16px !default;
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@mixin md-switch-checked($palette) {
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.md-slide-toggle-thumb {
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background-color: md-color($palette);
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}
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.md-slide-toggle-bar {
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background-color: md-color($palette, 0.5);
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}
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}
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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: $md-slide-toggle-height;
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white-space: nowrap;
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user-select: none;
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outline: none;
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&.md-checked {
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@include md-switch-checked($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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.md-slide-toggle-thumb-container {
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transform: translate3d(100%, 0, 0);
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}
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}
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&.md-disabled {
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.md-slide-toggle-label, .md-slide-toggle-container {
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cursor: default;
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}
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.md-slide-toggle-thumb {
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// The thumb of the slide-toggle always uses the hue 400 of the grey palette in dark or light themes.
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// Since this is very specific to the slide-toggle component, we're not providing
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// it in the background palette.
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background-color: md-color($md-grey, 400);
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}
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.md-slide-toggle-bar {
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background-color: md-color($md-foreground, divider);
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}
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}
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}
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// The label is our root container for the slide-toggle / switch indicator and label text.
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// It has to be a label, to support accessibility for the visual hidden input.
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.md-slide-toggle-label {
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display: flex;
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flex: 1;
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cursor: pointer;
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}
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// Container for the composition of the slide-toggle / switch indicator.
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.md-slide-toggle-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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// The thumb container is responsible for the dragging functionality.
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// It moves around and holds the actual circle as a thumb.
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.md-slide-toggle-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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}
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// The thumb will be elevated from the slide-toggle bar.
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// Also the thumb is bound to its parent thumb-container, which manages the movement of the thumb.
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.md-slide-toggle-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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// Horizontal bar for the slide-toggle.
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// The slide-toggle bar is shown behind the thumb container.
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.md-slide-toggle-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: $md-slide-toggle-bar-height;
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// The bar of the slide-toggle always uses the hue 500 of the grey palette in dark or light themes.
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// Since this is very specific to the slide-toggle component, we're not providing
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// it in the background palette.
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background-color: md-color($md-grey, 500);
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border-radius: 8px;
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}
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// The slide toggle shows a visually hidden checkbox inside of the component.
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// This checkbox allows us to take advantage of the browsers support.
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// Like accessibility and keyboard interaction.
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.md-slide-toggle-checkbox {
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@include md-visually-hidden();
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}
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.md-slide-toggle-bar,
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.md-slide-toggle-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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