forked from viewit/KX-Bridge-Release
viewit
1f1d60d571
The printer's file/fileDetails MQTT action extracts and base64-encodes
the embedded "; thumbnail begin" block from a GCode file's header on
demand and returns it inline as data.file_details.thumbnail - verified
live against a real Kobra X (a valid 230x110 PNG came back for an
existing print file).
New endpoint GET /kx/printer-files/{filename}/thumbnail wraps this via
the existing _wait_for_file_action() helper (same fire-and-forget +
file/report-callback pattern as listLocal/deleteBatch). Results are
cached in-memory per filename (self._printer_thumbnail_cache) - a
file's thumbnail never changes while it exists on the printer, and the
tab can list 100+ files at once.
Frontend fetches thumbnails lazily through a small sequential queue
(_printerThumbQueue/_pumpPrinterThumbQueue) after rendering the file
list, one request at a time rather than firing 100+ concurrent MQTT
roundtrips, and swaps each card's placeholder printer icon for the
real <img> once its thumbnail arrives. Client-side cache
(_printerThumbCache) avoids re-fetching on re-render (e.g. after a
selection change).
Verified end-to-end against the real printer and visually via
Playwright: all 10 listed files rendered their actual, distinct print
preview thumbnails instead of the generic icon.