In order to detect if a barcode scanner is being used, we detect the
delay between keypresses. The value is hardcoded to 55 ms. However, in
the case of a bluetooth scanner, this delay is often not enough,
resulting in an incorrect capture of the barcode.
We add the config parameter `barcode.max_time_between_keys_in_ms` which
allows the user to fine tune this delay for his hardware.
opw-806398
For a model to use it, it must :
- Inherit barcodes.barcode_events_mixin and override on_barcode_scanned(self, barcode)
- Add <field name=barcode_scanned widget=barcode_handler/> to each form view that
should listen to barcode events and trigger on_barcode_scanned.
The method on_barcode_scanned works just like an onchange.
Nicolas Martinelli