136 lines
4.8 KiB
Plaintext
136 lines
4.8 KiB
Plaintext
# DisclosureMenu
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A component to be used for making dropup/down/left/right menus i.e. Disclosure
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Menus. Please see both Disclosure and Menu components for more details.
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The component does not make any guesses around whether you want the panel to
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be on another DOM layer/absolutely positioned so you should apply that layout
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yourself, but it's root node is relatively positioned to help for the fairly
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common usecase of having a floating menu.
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```hbs preview-template
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<figure>
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<figcaption>
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Non-floating Menu
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</figcaption>
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<DisclosureMenu as |disclosure|>
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<disclosure.Action
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{{on 'click' disclosure.toggle}}
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>
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{{if disclosure.expanded 'Close' 'Open'}}
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</disclosure.Action>
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<disclosure.Menu as |panel|>
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<panel.Menu as |menu|>
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<menu.Item>
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<menu.Action>Item 1</menu.Action>
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</menu.Item>
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<menu.Item>
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<menu.Action>Item 2</menu.Action>
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</menu.Item>
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</panel.Menu>
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</disclosure.Menu>
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</DisclosureMenu>
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</figure>
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<figure>
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<figcaption>
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Floating Menu
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</figcaption>
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<DisclosureMenu as |disclosure|>
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<disclosure.Action
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{{on 'click' disclosure.toggle}}
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>
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{{if disclosure.expanded 'Close' 'Open'}}
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</disclosure.Action>
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<disclosure.Menu
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style={{style-map
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(array 'position' 'absolute')
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(array 'background-color' 'var(--token-color-surface-primary)')
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}}
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as |panel|>
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<panel.Menu as |menu|>
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<menu.Item>
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<menu.Action>Item 1</menu.Action>
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</menu.Item>
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<menu.Item>
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<menu.Action>Item 2</menu.Action>
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</menu.Item>
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</panel.Menu>
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</disclosure.Menu>
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</DisclosureMenu>
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</figure>
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```
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`DisclosureMenu` also supports virtually scrolling its menu items for when you have 1000s of items to display in the menu whilst avoiding DOM stuttering. The set up is a tinsy bit more involved. but eesnetially you provide the data items for the menu using the `@items` argument, and then you can loop through these in the menu to make/use your menu items. The `menu.items` property is automatically paged for you depending on the scroll position of the menu panel. Importantly, right now, you should provide a height value for each menu.item using the `--paged-row-height` CSS property, you can do this inline or within your CSS (preferred). If you don't do this the component is unable to calculate the size of the scroll track/thumb. In the future (when needed) we will provide a callback for each item so you can specify a function to calculate the size of each individual item to give us a little more flexibility on what we can do with this component.
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```hbs preview-template
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<DataSource
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@src={{uri
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'/${partition}/${nspace}/${dc}/nodes'
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(hash
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nspace=''
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partition=''
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dc='dc-1'
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)
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}}
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as |source|>
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<DisclosureMenu
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@items={{source.data}}
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as |disclosure|>
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<disclosure.Action
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{{on 'click' disclosure.toggle}}
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>
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{{if disclosure.expanded 'Close' 'Open'}}
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</disclosure.Action>
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<disclosure.Menu
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style={{style-map
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(array 'position' 'absolute')
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(array 'max-height' '360' 'px')
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(array 'width' '560' 'px')
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(array '--paged-row-height' '42px')
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}}
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as |panel|>
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<panel.Menu as |menu|>
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{{#each menu.items as |item|}}
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<menu.Item>
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<menu.Action>{{item.Node}}</menu.Action>
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</menu.Item>
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{{/each}}
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</panel.Menu>
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</disclosure.Menu>
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</DisclosureMenu>
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</DataSource>
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```
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## Arguments
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| Argument | Type | Default | Description |
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| --- | --- | --- | --- |
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| `expanded` | `Boolean` | false | The _initial_ state of the disclosure. Please note: this is the _initial_ state only, please use the `disclosure.open` and `disclosure.close` for controling the state. |
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| `items` | `object[]` | | When using a paginated menu you should add all possible items to this arguments and then uses the disclosure.Panel.Menu.items property for `each`ing through, see above example |
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## Exported API
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| Name | Type | Description |
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| --- | --- | --- |
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| `Action` | `GlimmerComponent` | A contextual '<Action />' component with aria attributes correctly applied, please note you still need to add an 'on' modifier here so you can control whether it opens on click/hover etc |
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| `Menu` | `MenuComponent` | A contextual '<Menu />' component already wrapped in a disclosure.Details component |
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| `toggle` | `Function` | Toggle the open/close state of the disclosure |
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| `expanded` | `Boolean` | Whether the disclosure is 'expanded' or not |
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| `disclosure` | `DisclosureComponentAPI` | A reference to the full DisclosureComponentAPI |
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### menu.Action
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An `<Action />` component with the correct aria attributes added.
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### menu.Menu
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A `<Menu />` component with the correct aria attributes added.
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## See
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- [Template Source Code](./index.hbs)
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---
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