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John Cowen 80960c9d54 ui: Add `<State /> and `{{state-matches}}` ember component/helper (#7556 ) This commit adds 2 ember component/helpers and a service to contain the shared functionality for matching/rendering content dependent on state identifiers. Currently a `service.state` method has been added to easily make manual state objects, but these are built towards using `xstate` to manage UI state in some of our future components. We've added some tests here, and we aren't currently using these components anywhere in this commit.		2020-05-12 17:14:20 +00:00
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README.mdx	…
index.hbs	…
index.js	…

README.mdx

## State

`<State @state={{matchableStateObject}} @matches="idle">Currently Idle</State>`

`<State />` is a renderless component that eases rendering of different states
from within templates. State objects could be manually made state objects and
xstate state objects. It's very similar to a normal conditional in that if the
state identifier matches the current state, the contents of the component will
be shown.

### Arguments

| Argument/Attribute | Type | Default | Description |
| --- | --- | --- | --- |
| `state` | `object` |  | An object that implements a `match` method |
| `matches` | `String\|Array` |  | A state identifier (or array of state identifiers) to match on |


### Example

```handlebars
<State @state={{state}} @matches="idle">
  Currently Idle
</State>
<State @state={{state}} @matches="loading">
  Currently Loading
</State>
<State @state={{state}} @matches={{array 'loading' 'idle'}}>
  Idle and loading
</State>
```

### See

- [Component Source Code](./index.js)
- [Template Source Code](./index.hbs)

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