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Architecture

Frontend

The frontend uses Druid for the GUI of Lapce. Druid is a data first GUI framework. And all the state and logic are in lapce-data sub crate, e.g., file buffers, editor tabs, cursor, etc. The UI widgets tree, layout, and rendering logic are in lapce-ui sub crate, including all the UI related stuff, e.g., keyboard and mouse events, file dialogs, context menus etc.

Proxy

The lapce-proxy sub crate provides the interface between the frontend, and the file system, plugins and lsp servers, so Lapce talks to files, plugins, lsp servers through the proxy. The reason for that is to provide the ability for remote development. In remote development mode, the lapce-proxy binary runs in the remote box, so that it can read files in the remote box, and the plugins and lsp servers can run in the remote box to utilise the power of the remote box.

File Editing

Here is the flow of a typical file editing process. When you open a file in the GUI, lapce-data talks to lapce-proxy which reads the file from local disk and responds with the content of the file. lapce-data stores the file content locally. When lapce-ui receives a keyboard event, it modifies the file content in lapce-data, and only sends the change of that edit to lapce-proxy. lapce-proxy receives the change, and applies the change locally which make the file content in sync. When you save the file in the GUI, lapce-data sends the file save request to lapce-proxy, and lapce-proxy saves the file to the local disk.