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rewrite sidenav docs
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‎src/lib/sidenav/README.md

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@@ -44,6 +44,10 @@ The sidenav panel.
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| `close(): Promise<void>` | Close the sidenav. Equivalent to `opened = false`. Returns a promise that will resolve when the animation completes, or be rejected if the animation was cancelled. |
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| `toggle(): Promise<void>` | Toggle the sidenav. This is equivalent to `opened = !opened`. Returns a promise that will resolve when the animation completes, or be rejected if the animation was cancelled. |
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### Notes
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The `<mat-sidenav>` will resize based on its content. You can also set its width in CSS, like so:

‎src/lib/sidenav/sidenav.md

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`<mat-sidenav>` is a panel that can be placed next to or above some primary content. A sidenav is
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typically used for navigation, but can contain any content.
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Angular Material provides two sets of components designed to add collapsible side content (often
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navigation, though it can be any content) alongside some primary content. These are the sidenav and
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drawer components.
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<!-- example(sidenav-overview) -->
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The sidenav components are designed to add side content to a fullscreen app. To set up a sidenav we
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use three components: `<mat-sidenav-container>` which acts as a structural container for our content
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and sidenav, `<mat-sidenav-content>` which represents the main content, and `<mat-sidenav>` which
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represents the added side content.
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<!-- TODO(mmalerba): sidenav example -->
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There are also drawer components, `<mat-drawer-container>`, `<mat-drawer-content>`, and
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`<mat-drawer>`, which are analogous to their sidenav equivalents. Rather than adding side content
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to the app as a whole, these are designed to add side content to a small section of your app. They
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support almost all of the same features, but do not support fixed positioning.
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<!-- TODO(mmalerba): drawer example -->
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### Specifying the main and side content
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Both the main and side content should be placed inside of the `<mat-sidenav-container>`, content
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that you don't want to be affected by the sidenav, such as a header or footer, can be placed outside
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of the container.
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The side content should be wrapped in a `<mat-sidenav>` element. The `position` property can be used
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to specify which end of the main content to place the side content on. `position` can be either
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`start` or `end` which places the side content on the left or right respectively in left-to-right
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languages. If the `position` is not set, the `start` end will be assumed. A
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`<mat-sidenav-container>` can have up to two `<mat-sidenav>` elements total, but only one for any
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given side.
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The main content should be wrapped in a `<mat-sidenav-content>`. If no `<mat-sidenav-content>` is
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specified for a `<mat-sidenav-container>`, one will be created implicitly and all of the content
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inside the `<mat-sidenav-container>` other than the `<mat-sidenav>` elements will be placed inside
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of it.
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The following are examples of valid sidenav layouts:
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The sidenav and its associated content live inside of an `<mat-sidenav-container>`:
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```html
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<mat-sidenav-container>
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<mat-sidenav>
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<!-- sidenav content -->
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</mat-sidenav>
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<mat-sidenav>Start</mat-sidenav>
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<mat-sidenav-content>Main</mat-sidenav-content>
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</mat-sidenav-container>
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```
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<!-- primary content -->
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```html
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<mat-sidenav-container>
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<mat-sidenav>Start</mat-sidenav>
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<mat-sidenav position="end">End</mat-sidenav>
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<section>Main</section>
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</mat-sidenav-container>
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```
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A sidenav container may contain one or two `<mat-sidenav>` elements. When there are two
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`<mat-sidenav>` elements, each must be placed on a different side of the container.
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See the section on positioning below.
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```html
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<mat-sidenav-container></mat-sidenav-container>
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```
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### Sidenav mode
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The sidenav can render in one of three different ways based on the `mode` property.
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Anf these are examples of invalid sidenav layouts:
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```html
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<mat-sidenav-container>
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<mat-sidenav>Start</mat-sidenav>
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<mat-sidenav position="start">Start 2</mat-sidenav>
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</mat-sidenav-container>
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```
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```html
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<mat-sidenav-container>
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<mat-sidenav-content>Main</mat-sidenav-content>
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<mat-sidenav-content>Main 2</mat-sidenav-content>
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</mat-sidenav-container>
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```
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```html
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<mat-sidenav-container></mat-sidenav-container>
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<mat-sidenav></mat-sidenav>
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```
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| Mode | Description |
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|------|-------------------------------------------------------------------------------------------|
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| over | Sidenav floats _over_ the primary content, which is covered by a backdrop |
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| push | Sidenav _pushes_ the primary content out of its way, also covering it with a backdrop |
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| side | Sidenav appears _side-by-side_ with the primary content |
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These same rules all apply to the drawer components as well.
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Using the `side` mode on mobile devices can affect the performance and is also not recommended by the
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[Material Design specification](https://material.io/guidelines/patterns/navigation-drawer.html#navigation-drawer-behavior).
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### Opening and closing a sidenav
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### Positioning the sidenav
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The `position` property determines whether the sidenav appears at the `"start"` or `"end"` of the
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container. This is affected by the current text direction ("ltr" or "rtl"). By default, the sidenav
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appears at the start of the container.
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A `<mat-sidenav>` can be opened or closed using the `open()`, `close()` and `toggle()` methods. Each
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of these methods returns a `Promise<boolean>` that will be resolved with `true` when the sidenav
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finishes opening or `false` when it finishes closing.
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The opened state can also be set via a property binding in the template using the `opened` property.
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The property supports 2-way binding.
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### Sizing the sidenav
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The `<mat-sidenav>` will, by default, fit the size of its content. The width can be explicitly set
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via CSS:
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`<mat-sidenav>` also supports output properties for just open and just close events, The `(opened)`
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and `(closed)` properties respectively.
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<!-- TODO(mmalerba): open/close example -->
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All of these properties and methods work on `<mat-drawer>` as well.
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### Changing the sidenav's behavior
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The `<mat-sidenav>` can render in one of three different ways based on the `mode` property.
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| Mode | Description |
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|--------|-----------------------------------------------------------------------------------------|
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| `over` | Sidenav floats _over_ the primary content, which is covered by a backdrop |
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| `push` | Sidenav _pushes_ the primary content out of its way, also covering it with a backdrop |
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| `side` | Sidenav appears _side-by-side_ with the main content, shrinking the main content's width to make space for the sidenav. |
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If no `mode` is specified, `over` is used by default.
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<!-- TODO(mmalerba): modes example -->
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`<mat-drawer>` also supports all of these same modes.
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### Disabling automatic close
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Clicking on the backdrop or pressing the <kbd>Esc</kbd> key will normally close an open sidenav.
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However, this automatic closing behavior can be disabled by setting the `disableClose` property on
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the `<mat-sidenav>` or `<mat-drawer>` that you want to disable the behavior for.
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Custom handling for <kbd>Esc</kbd> can be done by adding a keydown listener to the `<mat-sidenav>`.
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Custom handling for backdrop clicks can be done via the `(backdropClick)` output property on
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`<mat-sidenav-container>`.
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<!-- TODO(mmalerba): autoclose example -->
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### Setting the sidenav's size
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The `<mat-sidenav>` and `<mat-drawer>` will, by default, fit the size of its content. The width can
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be explicitly set via CSS:
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```css
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mat-sidenav {
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Try to avoid percent based width as `resize` events are not (yet) supported.
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For a fullscreen sidenav, the recommended approach is set up the DOM such that the
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`<mat-sidenav-container>` can naturally take up the full space:
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### Fixed position sidenavs
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```html
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<app>
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<mat-sidenav-container>
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<mat-sidenav mode="side" opened="true">Drawer content</mat-sidenav>
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<div class="my-content">Main content</div>
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</mat-sidenav-container>
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</app>
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```
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```css
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html, body, material-app, mat-sidenav-container, .my-content {
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margin: 0;
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width: 100%;
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height: 100%;
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}
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```
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For `<mat-sidenav>` only (not `<mat-drawer>`) fixed positioning is supported. It can be enabled by
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setting the `fixedInViewport` property. Additionally, top and bottom space can be set via the
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`fixedTopGap` and `fixedBottomGap`. These properties accept a pixel value amount of space to add at
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the top or bottom.
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### FABs inside sidenav
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For a sidenav with a FAB (Floating Action Button) or other floating element, the recommended approach is to place the FAB
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outside of the scrollable region and absolutely position it.
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<!-- TODO(mmalerba): fixed example -->
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### Common layout patterns
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### Disabling closing of sidenav
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By default, sidenav can be closed either by clicking on the backdrop or by pressing <kbd>ESCAPE</kbd>.
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The `disableClose` attribute can be set on `mat-sidenav` to disable automatic closing when the backdrop
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is clicked or <kbd>ESCAPE</kbd> is pressed. To add custom logic on backdrop click, add a `(backdropClick)` listener to
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`mat-sidenav-container`. For custom <kbd>ESCAPE</kbd> logic, a standard `(keydown)` listener will suffice.
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```html
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<mat-sidenav-container (backdropClick)="customBackdropClickHandler()">
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<mat-sidenav disableClose (keydown)="customKeydownHandler($event)"></mat-sidenav>
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</mat-sidenav-container>
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```
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<!-- TODO(mmalerba): fill out -->
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#### Full-height sidenav
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#### Sidenav under toolbar
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#### Mobile sidenav
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#### Responsive sidenav
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### Accessibility
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<!-- TODO(mmalerba): fill out -->
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### Troubleshooting
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<!-- TODO(mmalerba): fill out -->

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