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`handleInput()` called `stopProgress()` and mutated no reactive state, so Lit scheduled no update, `updated()` never ran, and the tail of `updated()` that restarts the interval never executed. Only a `change` event or the next backend report could bring it back — so an `input` that never commits froze the interpolation: a drag cancelled outside the element, a pointer taken by a scroll, or a touch on the track treated as a scrub, all ordinary gestures on a phone. While playing the 1 Hz report papered over it within a second; with reports not arriving it was permanent. The drag is `@state` now and `updated()` decides whether the interval runs, so there is one place that knows. `handleChange` no longer starts it directly for the same reason. A flag set on `input` can strand, which would turn a stall of up to a second into a permanent one — the failure this removes. `change` is the ordinary end; `pointerup`/`pointercancel`/`touchend`/`touchcancel` on the document are the ends that are not, attached with the drag and dropped with it, because the pointer is routinely released outside the element it started in. The other half is that a report arriving mid-drag used to overwrite `seekValue` and pull the thumb out from under the finger once a second. It is skipped while dragging, and its seq is deliberately left unrecorded so the first report after the drag still counts as fresh. Three tests, all exercised against the fault: two fail on the old component, and the third fails if the drag flag is left set — which is the failure mode the fix introduces and the listeners exist to prevent. Verified on the device too (Chrome 113): mid-drag the bar holds its value and ignores reports, and on release it adopts the backend's real position and resumes ticking. Closes #164
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