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breaking(breakpoint): add breakpointObserver store (#1092)

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* breaking: re-name event "on:match" to "on:change" in `Breakpoint.svelte`

* feat: add `breakpointObserver` read-only store

* refactor: export breakpoint constants from `breakpoints.js`
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brunnerh 2022-03-08 17:38:58 +01:00 • committed by GitHub
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docs/src/pages/components/Breakpoint.svx
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@ -22,6 +22,14 @@ This utility component uses the [Window.matchMedia API](https://developer.mozill
Bind to the `size` prop to determine the current breakpoint size. Possible values include: `"sm" | "md" | "lg" | "xlg" | "max"`.
The `"on:match"` event will fire only when a breakpoint change event occurs (e.g., the browser width is resized).
The `"on:change"` event will fire when the size is initially determined and when a breakpoint change event occurs (e.g., the browser width is resized).
<FileSource src="/framed/Breakpoint/Breakpoint" />
<FileSource src="/framed/Breakpoint/Breakpoint" />
### Store and Breakpoint Values
As an alternative to the component, `breakpointObserver` can be used to get the current size as a Svelte store. The store has two additional functions which create derived stores that return a `boolean` indicating whether the size is smaller/larger than a certain breakpoint.
There also exists a `breakpoints` dictionary mapping from `BreakpointSize` to `BreakpointValue`.
<FileSource src="/framed/Breakpoint/BreakpointObserver" />