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Update architecture.md (#1750)

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* Update architecture.md

Adds some more details on how views work.

* Add additional architecture discussion from matrix, written by @sudormrfbin
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Daniel S Poulin 2022-03-08 21:19:03 -05:00 committed by GitHub
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@ -54,15 +54,40 @@ A `Document` ties together the `Rope`, `Selection`(s), `Syntax`, document
file.
A `View` represents an open split in the UI. It holds the currently open
document ID and other related state.
document ID and other related state. Views encapsulate the gutter, status line,
diagnostics, and the inner area where the code is displayed.
> NOTE: Multiple views are able to display the same document, so the document
> contains selections for each view. To retrieve, `document.selection()` takes
> a `ViewId`.
`Info` is the autoinfo box that shows hints when awaiting another key with bindings
like `g` and `m`. It is attached to the viewport as a whole.
`Surface` is like a buffer to which widgets draw themselves to, and the
surface is then rendered on the screen on each cycle.
`Rect`s are areas (simply an x and y coordinate with the origin at the
screen top left and then a height and width) which are part of a
`Surface`. They can be used to limit the area to which a `Component` can
render. For example if we wrap a `Markdown` component in a `Popup`
(think the documentation popup with space+k), Markdown's render method
will get a Rect that is the exact size of the popup.
Widgets are called `Component`s internally, and you can see most of them
in `helix-term/src/ui`. Some components like `Popup` and `Overlay` can take
other components as children.
`Layer`s are how multiple components are displayed, and is simply a
`Vec<Component>`. Layers are managed by the `Compositor`. On each top
level render call, the compositor renders each component in the order
they were pushed into the stack. This makes multiple components "layer"
on top of one another. Hence we get a file picker displayed over the
editor, etc.
The `Editor` holds the global state: all the open documents, a tree
representation of all the view splits, and a registry of language servers. To
open or close files, interact with the editor.
representation of all the view splits, the configuration, and a registry of
language servers. To open or close files, interact with the editor.
## LSP