logan
3479ae8d39
Scrolling the albums grid pops art in: the cards already draw the smallest adequate tier and are already lazy, so what was left is *when* the request happens. The grids are virtualized, so the `<img>` — and therefore the fetch — does not exist until the virtualizer renders its card, which is about 1000px past the viewport, or two screens on the reference device. The issue asks for a larger overscan and that is not available: `_overhang` is a hard-coded `protected` field on `BaseLayout` with no configuration surface. So the request is issued ahead of the element instead. `utils/image-prefetch.ts` warms a bounded window either side of the rendered range, from `rangeChanged` rather than `visibilityChanged` — the two report different ranges, and a window measured from what is *visible* is spent on cards that already exist. Cover and artist URLs are served under `Cache-Control: immutable` (content-hashed filenames), so a prefetched image is a cache hit by the time its card is drawn. The bytes are the browser's; what this holds is the set of URLs asked for, capped and reported to `__yjCacheStats()`. Measured on the bulk seed (4 988 albums), ten 2 400px jumps, covers in the viewport with `naturalWidth === 0`: 254 of 258 blank one frame after the jump and 214 two frames after, against 117 and 77 with the prefetch. Closes #65
YellowJacket Frontend
This directory contains the frontend for YellowJacket.
Dependencies
There are a couple of tools that are required to build and use the frontend.
vitefor- transpiling typescript
- bundling the final "package" that is useb by the webview
- running a dev server with hot-reloading
- configured with the
vite.config.tsfile in this directory
pnpmfor managing frontend dependency packages
There are a handful of dependency packages that we use directly in the frontend.
picocssfor basic CSS while developinglitfor a simple but powerful wrapper around Web Components
Lastly, there are some dependencies that only benefit development
tsservercomes bundled with vscode and can be used as an LSP with other editors usingtypescript-language-server- Used for autocomplete, syntax highlighting, etc.
- This can be configured with the
tsconfig.jsonfile in the root of the project- NOTE: your configuration should align with the
viteconfig so you get in-editor feedback that aligns with how the build will be done.
- NOTE: your configuration should align with the
Development
Ideally, you would use the frontend in the wails app as the frontend depends on the Go bindings generated by Wails.
You can do this by running wails dev in the root of the YellowJacket repo.
If you want to run the frontend standalone, make sure the Wails go bindings have been generated with wails generate modules.
Then, you can run pnpm dev to run the vite dev server.
For more information on what commands are available, refer to package.json.
Code
Web Components
Our frontend is based off of Web Components, a standard that provides native browser encapsulation of components that can include HTML, CSS and Javascript all together.
Instead of writing these components manually in Javascript, we utilize lit as a wrapper library.
Typescript
To better integrate with our tooling and to provide a better developer experience with strong typing, we have written all functional frontend code in Typescript. Vite serves as our Typescript transpiler.
Important Files and Directories
NOTE: most of these directories have aliases defined in tsconfig.json and vite.config.ts so that we may refer to them by shorthand when importing.
index.htmlandindex.jsis the entrypoint for the frontend. The first page that loads.wailsjs/goGo code bindings generated by wails reside herewailsjs/runtimethe Wails runtime code needed to use Wails featuressrcall app code resides heresrc/assetsstatic assets like fonts, images and iconssrc/componentslit components that are used to compose the applicationsrc/pagespages that serve as other entrypoints for the application that can be navigated to